Journal of Spectroscopy

Volume 2013 (2013), Article ID 370325, 10 pages

http://dx.doi.org/10.1155/2013/370325

Research Article

A Promising Material by Using Residue Waste from Bisphenol A Manufacturing to Prepare Fluid-Loss-Control Additive in Oil Well Drilling Fluid

Zhi-Lei Zhang,¹ Feng-Shan Zhou,¹ Yi-He Zhang,¹ Hong-Wei Huang,¹ Ji-Wu Shang,¹ Li Yu,¹ Hong-Zhen Wang,² and Wang-Shu Tong¹

¹National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China

²Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received 5 September 2013; Accepted 21 October 2013

Academic Editor: Yizhuang Xu

Copyright © 2013 Zhi-Lei Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

The residues mixture from Bisphenol A manufacturing process was analyzed. Fourier transform infrared (FTIR) spectroscopy, gas chromatography-mass spectrometry (GC-MS), and nuclear magnetic resonance (NMR) were used to characterize the residues. The results indicated that the residues were complex mixture of several molecules. 3-(2-Hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol and phenol were the main components of the residues. The technical feasibility of using it as phenol replacement in fluid-loss-control additive production was also investigated. The fluid-loss-control capacity of the novel additive was systematically investigated. It was discovered that the well fluid-loss performance of the prepared additive can be achieved, especially at high temperature.

1. Introduction

Bisphenol A (BPA) is an organic compound with two phenolic hydroxyl groups [1]. Generally, it is synthesized by condensation of phenol with acetone [2–4]. For reactions involving the substitution of a proton in an aromatic ring, both the rate of reaction and the equilibrium distribution of products are influenced by the density of electrons at the centre of reaction [5]. However, due to the high reactivity of the system, many byproducts can be produced and are present in the reaction mixture. For example, a crude product stream consisted of 41% BPA, 36.2% ortho,para-isomer, 1.1% ortho,ortho-isomer, 14.2% phenol, 3.5% chromane, 0.05% flavan, and 12% of unidentified compounds [6]. The formulas of some by-products are shown in Figure 1. After numerous and diverse purification processes, the impurities (such as the excess phenol, cyclic dimmers derived from BPA, chroman-based compounds, spirobiindane compounds, and the like) were separated from BPA and finally formed the complex residue compound.

Figure 1: Formulas of the impurities.

Being an important industrial chemical, BPA has been widely used [7, 8], and the demand for BPA production has increased [1]. With the growing production of BPA [9], there will be more and more residues from the BPA industry. It is predicted that there will be over 50 × 10³ ton residues produced annually in China. According to European Waste Catalogue (EWC), the residues are absolute hazardous (07 01 08*). So, appropriate disposal and recycling of the residues are necessary for environmental protection and public health. The residues are generally burned as a means of disposal. Because the incineration technology is not qualified; treatment and recycling of the residues in China have been a thorny problem. The previous researches mainly concentrated on the treatment of the by-products and recovery of the useful phenol [10–12]. Hence, it is imperative to develop methods to utilize the industry waste. So far, there have only been relatively limited researches in this respect. The residues have been used in furan no-bake foundry binders and phenolic-based foundry shell resin formulations [13].

The petroleum drilling fluids, more commonly known as drilling muds, are complex chemical systems necessary for oil development. Among other functions, a drilling mud needs to create a thin low-permeability cake that protects permeable production formations. Fluid-loss-control additives form filter cakes surrounding the well bore to retard the loss of drilling fluid into permeable formations [14–17]. It has been common practice in the oil well drilling industry to employ starches, starch derivatives, cellulose derivatives, and water-soluble gums to reduce the filtrate volume of water base muds. Although these materials reduce the fluid loss of drilling muds, they are not thermally stable. Generally, water-soluble sulfonated phenolic condensate is obtained from the reaction of phenol, formaldehyde, and anhydrous sodium sulfite [18]. As a drilling mud additive, it has good fluid-loss-control performance and resistance to high temperature [19]. However, when the treated muds are subjected to extreme thermal environments, such products should be further modified to enhance the properties. And with raw material prices, the commercial pressure of competition is also growing. Utilization of waste materials for modification or substitution of primary resources has been a widespread concern [20–22]. Phenol has an ortho-para directing activation group, hydroxyl. It could be condensed and sulfonated to produce a fluid-loss-control additive under the presence of formaldehyde and sodium sulfite. Although there are many complicate components coexisting in the residues, most of them have the activation group hydroxyl and could react like phenol. The condensation polymerization by using this kind of residues is more likely a copolycondensation. The resultant products will have the same essential functional group as the products from condensation and sulfonation by using phenol. So, it is feasible by using the residues to displace phenol as a raw material to produce fluid-loss-control additive.

The purpose of this study was to confirm the components of the residue mixture and evaluate the technical feasibility of using it as phenol replacement in fluid-loss-control additive production.

2. Experimental Details

2.1. Materials

The residues mixtures were obtained from Nanjing Zunyu Chemical Co., Ltd., China. It was obvious that the waste material was shiny black solid (Figure 2(a)). It was highly brittle, and the powder (Figure 2(b)) could be obtained after grinding. And then, the powder was stirring under the refluxing temperature in distilled water and sodium hydroxide (NaOH) solution for an hour, respectively. In Figure 2(c), the dispersion of the powder was markedly different. In distilled water, the powder was gathering into a mass slowly, but it dispersed well in the NaOH solution. The raw bentonite was obtained from Dagang Oilfield (Group) Co., Ltd., Tianjin, China. The sulfonated methyl phenolic resin obtained from the Third Exploration Company of Tarim Petroleum Exploration and Development Headquarters was marked as M₁ and obtained from Derun Chemical Co., Ltd., Binzhou, China, and was marked as M₂. Sulfonated lignite obtained from Hairong Industry & Trade Co., Ltd., Korla, China, and Beijing Institute of Exploration Engineering was marked as M₃ and M₄, respectively. All the chemicals such as phenol, formaldehyde, sodium sulfite, sodium bisulfite, sodium hydroxide, sodium chloride, acetone, and cyclohexane were analytical grade and obtained from Beijing Chemical Plant, China. A homemade column chromatograph with a length and width of 40 cm and 3 mm, respectively, packed with silica gel (ZCX.H, 200–300 mesh size, Branch of Qingdao Haiyang Chemical Plant, China) was used in the study. Standard HSGF254 HPTLC plates (100 × 25 mm) were purchased from Yantai Chemical Industry Research Institute, China.

Figure 2: Comparison between the residues before (a) and after (b) grinding and the dispersion in distilled water and NaOH solution (c).

2.2. Methods

FTIR was conducted on the residues on a Perkin-Elmer SP100 FTIR spectrometer by the KBr disc technique. It was operated in the ATR (attenuated total reflectance) mode, and 32 scans were collected at a resolution of 4 cm⁻¹.

An Agilent Technologies 7890A gas chromatograph equipped with the Agilent 5975C mass spectrometer (Agilent 7890A/5975C GC-MS System) was used to identify the organic compositions. The system was operated at 40°C for 1 min and then up to 300°C at a ramping rate of 10°C/min and held for 5 min. One μL of the samples was injected in split mode with a split ratio of 10 : 1. An Agilent J&W column, with 30 m in length, 0.25 mm internal diameter, and 0.25 μm film thicknesses was adopted in the separation system. High-purity helium was the carrier gas and introduced at a constant rate of 1.4 mL/min.

The eluent used in the column chromatography experiment was an acetone/cyclohexane (1/5, v/v) mixture which was determined by previous thin-layer chromatography experiments. The materials obtained by column chromatography were dried at 50°C for 24 h in a vacuum oven to a constant weight. Nuclear magnetic resonance spectra (¹H-NMR, 400 MHz) were acquired on a Bruker-400 spectrometer with the 1 mm TXI micro liter probe using deuterated chloroform as the solvent.

The fresh-water base mud containing 50 g/L of sodium bentonite was prepared by mixing the raw bentonite and fresh water at a certain ratio, stirring for 15 min at a high speed of 10,000 rpm and aging for 24 h at room temperature. The testing mud was obtained with an addition of fluid-loss-control agents and/or sodium chloride into the base mud.

The fluid-loss-control properties of the muds, including API filtrate volume (i.e., FLAPI) and high-temperature/high-pressure filtrate volume (i.e., FLHTHP), were determined according to American Petroleum Institute (API) specifications and Chinese SY/T5621-93 specifications, respectively. In this test process, a ZNS-2A medium-pressure and GGS42-2 high-pressure filtration apparatus (made by Qingdao Haitongda Special Instruments Co., Ltd., China) were used. Figure 3 shows the schematic of the filtration apparatus. The rheological parameters, such as apparent viscosity (AV), plastic viscosity (PV), and yield point (YP), were determined by a ZNN-D6 rotating viscometer.

(a)

(b)

Figure 3: Schematic of the API (a) and HTHP (b) filtration test apparatus.

2.3. Preparation of Fluid-Loss-Control Additive RPF

A 3-neck flask with a stirrer, thermometer, and reflux condenser was charged with the residues, formaldehyde water solution (37% w/w), sodium hydroxide, and water. The mixture was heated slowly to a certain temperature. After stirring for about an hour, a second portion of formaldehyde water solution, sodium hydroxide and water was added into the mixture with sodium sulfite and sodium bisulfite. After synthesis, the production was pan-dried at 70°C and then crushed into powders over 80 mesh sieve for use in mud tests. The nomenclature of this fluid-loss-control additive is designated as RPF here. And the PF was prepared using phenol to replace the residues. Furthermore, there are very little by-products produced from this process which is environmentally green.

2.4. Orthogonal Array Experimental Design

In the present study, an L25 (56) orthogonal array (OA) was used to investigate the effect of formulas and parameters. The orthogonal array was listed in Table 1, and the data analysis was carried out through the range analysis. After the orthogonal experiments and subsequent data analysis, the magnitudes were reflected.

Table 1: Levels and factors affecting the fluid-loss properties.

Levels
Factors

(°C)a

(mL)e
(h)f

1
60
2.77
17.12
3.61
29.7
3

2
70
1.39
5.71
2.71
39.6
4

3
80
0.93
3.42
1.80
49.5
5

4
90
0.69
2.45
1.20
59.4
6

5
100
0.56
1.90
0.90
69.3
7

: reaction temperature.

b: mass ratio of residue to formaldehyde.

c: mass ratio of residue to catalyst.

d: mass ratio of residue to sulfonating agent.

e: amount of water.

f: reaction time.

3. Results and Discussion

3.1. Spectroscopy Analysis

The infrared spectrum of the residues with the characteristic hydroxyl group stretching band at 3424 cm⁻¹ can be observed in Figure 4. The hydroxyl group band in the residues and RPF does not as strong as that in the PF. This could be attributed to the complex components of the residues and RPF. The absorption peaks at 2962 cm⁻¹ and 1468 cm⁻¹ can be assigned to the vibrational modes of methyl and/or methylene. The peaks at 1605 cm⁻¹ corresponded to the carbon-carbon double bond stretching vibration of the benzene ring skeleton. An observable sulfonate group antisymmetric stretching vibration band at 1195 cm⁻¹ and a carbon-sulfur bond stretching band at 1042 cm⁻¹ can be found in the spectrum of RPF and PF but not in the spectrum of the residues. This feature is considered to be characteristic of the sulfonation reaction.

Figure 4: FTIR spectra of the residues, RPF, and PF.

Gas chromatography-mass spectrometry (GC-MS) is used to isolate and determine the organic molecules. The chromatogram of residues is depicted in Figure 5(a). Separation and peak profiles are accomplished in 30 min and several components can be isolated. The component contents (with the retention time of 6.8 min, 8.8 min, 14.0 min, 21.5 min, and 22.9 min) are 34.5%, 7.6%, 5.6%, 24.6%, and 6.4%, respectively (Table 2). Figures 5(b), 5(c), 5(d), 5(e), and 5(f) show the partial mass spectra of these five constituents marked as 1#, 2#, 3#, 4#, and 5#. The molecular ions in the two main components, 1# and 2#, have values of 94 and 268, respectively, suggesting that number 1 is phenol, number 2 is 3-(2-hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol. Phenol has already been used to produce phenolic resin and sulfonated phenolic resin. Number 2 has two phenolic hydroxyl groups, so it could condense with formaldehyde as well.

Table 2: GC/MS results of the residues.

Peak
Retention time (min)
Assignments
Molecular ion
Content (%)

1#
6.8
Phenol
94.0
34.5

2#
21.5
Aa
268.0
24.6

3#
8.8
Undecane
156.0
7.6

4#
14.0
Bb
174.0
5.6

5#
22.9
Cc
268.0
6.4

A: 3-(2-hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol.

bB: 1,5,7-trimethyl-1,2,3,4-tetrahydronaphthalene.

cC: 3-(4-hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol.

(a)

(b)

(c)

(d)

(e)

(f)

Figure 5: Chromatogram of the residues (a) and mass spectra of the five components from the residues (peaks 1–5 in the chromatogram) at different retention times of (b) 6.8 min, (c) 21.5 min, (d) 8.8 min, (e) 14.0 min, and (f) 22.9 min.

There are many components in the residues. Some of the components have little content, similar structures, and polarity. Hence, it is difficult to separate the components absolutely. In our column chromatography experiments, there are five components obtained and the two main components are further identified by ¹H NMR and the results are in agreement with those from GC-MS. As shown in Figure 6(a), the signal at 5.051 ppm corresponds to the hydroxyl group (1). In the region of 6.8–7.3 ppm, there are signals assigned to the aromatic protons (2, 3, and 4). Hence, compounds number 1 is indeed phenol, also known as carbolic acid. In Figure 6(b), the resonance at 5.388 ppm corresponds to the hydroxyl group (1). The signals at 1.619 ppm, 0.858 ppm, and 2.346 ppm arise from protons 2, 3, and 4, respectively. In the region of 6.683–7.267 ppm, there are signals assigned to the aromatic protons and deuterated chloroform. Thus, number 2 is identified to be 3-(2-hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol.

(a)

(b)

Figure 6: Proton nuclear magnetic resonance spectrum acquired from the two main components of the residues.

Hydroxyl is an ortho-para directing group. Due to the reactive positions, these two components could be condensed and sulfonated under the presence of formaldehyde and sodium sulfite. The simple schematic diagrams of the production were shown in Figure 7; (a) was PF and (b) was RPF. This is not the real structure but a possible structure that imaged to illustrating the condensation polymerization and the sulfonation reaction. The real structure of the reaction products will be more complex. The other components do not play a major role in this study because of the relatively tiny amount or the absence of active functional group.

(a)

(b)

Figure 7: Structural representation of PF and RPF.

3.2. Effect of Formulas and Parameters on Filtration Properties

There are two important parameters in range analysis: and . is defined as the sum of the evaluation indexes of all levels () in each factor (). (mean value of ) is used to determine the optimal level and the optimal combination of factors. The optimal level for each factor could be obtained when is the largest. is defined as the range between the maximum and minimum value of and is used for evaluating the importance of the factors [23]. According to the OA25 matrix, twenty-five experiments were carried out and their filtrate volume results were shown in Table 3. This table shows that the range of FLAPI was from 10 mL to 30 mL and the range of FLHTHP was from 50 mL to 138 mL. The mean values of () for different factors at different levels in the range analysis were shown in Table 4. As mentioned, for each factor, the higher mean value () indicates the larger effect on filtration loss. As shown in Table 4, for API filtrate properties, was the lowest at these combinations , and, for HTHP properties, was the lowest at . Compared with the range values of different factors (), the factors’ levels of significance are as follows: for API, (6.10) > (4.20), (4.20) > (3.70) > (3.48) > (3.12); for HTHP, (31.20), (31.20) > (27.60) > (26.00) > (19.60) > (16.00).

Table 3: FLAPI and FLHTHP in OA25 matrix.

Trial number
Factors
Results

FLAPI (mL)
FLHTHP (mL)

1
1
1
1
1
1
1
22
78

2
1
2
2
2
2
2
23
72

3
1
3
3
3
3
3
24
60

4
1
4
4
4
4
4
20
72

5
1
5
5
5
5
5
20
90

6
2
1
2
3
4
5
19
72

7
2
2
3
4
5
1
27
92

8
2
3
4
5
1
2
22
100

9
2
4
5
1
2
3
25
126

10
2
5
1
2
3
4
30
138

11
3
1
3
5
2
4
26
110

12
3
2
4
1
3
5
23
104

13
3
3
5
2
4
1
18
50

14
3
4
1
3
5
2
26
124

15
3
5
2
4
1
3
26
116

16
4
1
4
2
5
3
20
74

17
4
2
5
3
1
4
22
56

18
4
3
1
4
2
5
26
104

19
4
4
2
5
3
1
10
86

20
4
5
3
1
4
3
27
108

21
5
1
5
4
3
2
21
60

22
5
2
1
5
4
3
25
68

23
5
3
2
1
5
4
20
90

24
5
4
3
2
1
5
25
112

25
5
5
4
3
2
1
24
96

Table 4: Range analysis data of the FLAPI and FLHTHP.

Value name

FLAPI

21.80
21.78
25.80
23.40
23.40
20.30

24.70
24.00
19.70
23.30
24.80
23.10

23.90
22.10
25.80
23.10
21.68
24.50

21.00
21.20
21.80
24.08
22.00
23.60

23.08
25.40
21.38
20.60
22.60
22.70

3.70
4.20
6.10
3.48
3.12
4.20

FLHTHP

74.40
78.80
102.40
101.20
92.40
80.40

105.60
78.40
87.20
89.20
101.60
89.00

100.80
80.80
96.40
81.60
89.60
92.00

85.60
104.00
89.20
88.80
74.00
93.20

85.20
109.60
76.40
90.80
94.00
96.40

31.20
31.20
26.00
19.60
27.60
16.00

3.3. Filtration Properties

According to the optimal conditions shown above, we have changed and modified the experiment conditions and parameters and finally prepared the fluid-loss-control additive RPF and PF. As a fluid-loss-control additive, RPF and PF could improve the properties of drilling fluid. Series of fresh-water and salt-water mud formulations were prepared, and the filtrate volumes were measured. To probe into the effect of dosage of the fluid-loss-control additive on filtration properties, test of API filtration, and HTHP filtration were performed. From Figures 8 and 9, it can be observed that the fluid-loss volumes decreased with more additives used. These additives dispersed into the base mud and then could be adsorbed onto the clay surface under the action of hydrogen bond between the hydroxyl and the clay surface [24]. So, there exists a saturated adsorption amount. When the additive addition was over dose, the excess additives have little influence on filtration properties. As shown in Figures 8 and 9, when the concentration of the additive was higher than 20 g/L, the fluid-loss volumes decreased slowly.

Figure 8: The effect of RPF and PF concentration on the API filtration loss of fresh water mud.

Figure 9: The effect of RPF and PF concentration on the HTHP filtration loss of fresh water mud.

From the analysis shown in Figures 5 and 6 and the possible structure of the product shown in Figure 7, it was expected that RPF would have better HTHP filtrate properties than PF. Segmental motion of molecular chain is dependence on temperature. The higher the temperature is, the more intense the segmental motion is. When the segmental motion is intense enough, molecular repulsion will be stronger than attraction and the molecular chain breaks. This was called degradation. There are two situations when polymer degrades; the molecular weight of the additive decreases and the amount of functional group of the additive decreases. These situations would cause the fluid-loss-control performance deterioration. Polymer will degrade at high temperatures, but the degree of the degradation is different because of the different molecular structure. If there are more aromatic groups in the molecular chain, the chain segments are bigger, and the temperature needs to be higher to make the segments motion. 3-(2-Hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol and phenol are the main components in the residues. Phenol condensation polymer is endowed well HTHP fluid-loss-control performance by introducing benzene ring into the molecular structure. 3-(2-Hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol has the activation group hydroxyl, and the molecular structure is more rigid than phenol. So, the resultant additives will have well HTHP fluid-loss-control performance by using these residues.

There are two competitive factors that affect the fluid-loss-control performance of RPF. (1) The components in the residue are complex, and some of them do not have the essential reactive group. These components cannot participate in the reaction and have no effect to improve the HTHP performance. (2) Most of the components in the residue are aromatic derivative, and they have the same reactive group like phenol. These components have the essential functional group as fluid-loss-control additives. Meanwhile, the side chain of the RPF molecular is bigger by introducing these aromatic derivatives into the condensation reaction as the constitutional unit than introducing phenol. The bigger side chain provides RPF better thermostability.

It can be seen in Figure 9 that the HTHP fluid-loss-control performance of RPF is better than PF. This can be explained as, in the fresh water mud, the thermo stability of the molecular chain is more important for the HTHP performance than the amount of the functional groups. The positive effect of the rigid molecular structure of the aromatic derivatives is more than the negative effect of the inactive components. This is why fewer components in residue could result in better HTHP fluid-loss-control performance in fresh water mud of RPF than that of PF.

To show the stability of RPF as a fluid-loss-control additive in saline solutions, filtration loss test of 20 g/L additive in 50 g/L bentonite mud with 40 g/L NaCl was performed. It is important to have additive for drilling mud that are stable in saline environments. Without additive, bentonite mud would lose its fluid-loss-control properties. According to the DLVO theory, it is thought to be explained as that the electrolyte solutions will compress the electrostatic double layer, affect hydration and coagulation stability of clays, and lead to the dehydration of the additives. Therefore, salt resistance additives should have enough adsorbing groups to connect with the clay surface and enough hydration groups to control the free water, and the hydration groups should be insensitive to electrolyte. The RPF have phenolic hydroxyl groups as the adsorbing groups and sulfonate groups as the hydration groups which have been proved to have well salt resistance [25]. RPF was expected to have salt resistance like PF. From the experiments data shown in Figures 10 and 11, unlike the expected results, RPF took a relatively poor effect compared with PF. It might be caused by the less active ingredient content. In the presence of salt solutions, the content of sulfonate groups plays the major role of the salt resistance. There are some inactive components in the residues, which could not participate in the sulfonation reaction. However, from the experiment results shown in Figure 9, it is obvious that although the effective component is less, the HTHP performance is still better.

Figure 10: API filtration loss of RPF and PF in base mud and NaCl (40 g/L) solutions.

Figure 11: HTHP filtration loss of RPF and PF in base mud and NaCl (40 g/L) solutions.

For comparison, the properties of RPF and some commercial fluid-loss-control additives were shown in Table 5. It can be seen that the API filtrate volume of RPF is 16 mL and the HTHP filtrate volume of RPF is 62 mL. Through the comparison, it reveals that the HTHP performance of RPF is better than these commercial products. The viscosity of RPF is higher, and the yield point is in the middle.

Table 5: Properties of RPF compared to commercial fluid-loss-control additives.

Fluid-loss-control additivea
AV (mPa·s)
PV (mPa·s)
YP (Pa)
FLAPI (mL)
FLHTHP (mL)

RPF
21.5
12.0
9.5
16.0
62.0

M₁
20.5
7.0
13.5
16.0
88.0

M₂
17.5
7.0
10.5
10.0
64.0

M₃
13.5
9.0
4.5
11.0
66.0

M₄
14.0
8.0
6.0
12.0
72.0

The dosage of fluid-loss-control additive was 20 g/L.

4. Conclusion

The residue wastes produced from the BPA industry were complex compounds. Phenol and 3-(2-hydroxyphenyl)-1,1,3-trimethyl-2,3-dihydro-1H-inden-5-ol were the two main components of the residues. The fluid-loss-control additive produced using the residues showed better HTHP fluid-loss-control performance than some commercial products. This study indicates that the residues have potential application in fluid-loss-control additive manufacture. Using it to substitute phenol will improve the high temperature performance and endow the additive with significant cost advantage.

Conflict of Interests

All the authors declare that they have no conflict of interests.

Disclaimes

The paper is authors owned work, is original and unpublished, and is not being considered for publication elsewhere.

Acknowledgments

This work is jointly supported by the Special fund of co-construction of Beijing Education Committee and the Fundamental Research Funds for the Central Universities no. 2652013062.

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