Method for removing impurities from synthetic rubber crude monomer by using composite nanofiltration membrane

A composite nanofiltration membrane and synthetic rubber technology, applied in the field of synthetic rubber, can solve the problems of high energy consumption and material consumption, and achieve the effects of continuous and stable production, stable operation and simple operation

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a synthetic rubber coarse monomer in order to overcome the problems of higher energy consumption and material consumption in the existing synthetic rubber monomer impurity removal process The impurity removal method has simple operation steps and has the characteristics of energy saving, emission reduction, environmental protection and convenience

Method used

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  • Method for removing impurities from synthetic rubber crude monomer by using composite nanofiltration membrane
  • Method for removing impurities from synthetic rubber crude monomer by using composite nanofiltration membrane
  • Method for removing impurities from synthetic rubber crude monomer by using composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The cut organic solvent-resistant composite nanofiltration membrane (this organic solvent-resistant composite nanofiltration membrane was purchased from Evonik Specialty Chemicals, the molecular weight cut-off is 300Da, the product brand PMselective, and the effective area of ​​the membrane is 0.0014m 2 ) into the membrane separation module, connect the membrane separation device, add 500mL isoprene to the raw material tank of the membrane separation device, turn on the power pump, fill the raw material tank with high-purity nitrogen, keep the pressure at 2MPa, wash the membrane After 2h, empty the feed liquid.

[0052] At 25°C, add 600mL of isoprene and 0.01g of p-tert-butylcatechol to the above-mentioned membrane separation device, stir for 0.1h, then add 0.05g of water, stir for 0.1h to form a raw material liquid, and then turn it on System, the pressure is maintained at 3MPa, the temperature of the raw material tank is controlled by a water bath at 30°C, the membran...

Embodiment 2

[0055] To the raw material solution in Example 1, add 0.03 g of polymerization inhibitor TBC, add 0.1 g of water, open the system, keep the pressure at 2.5 MPa, and control the temperature of the raw material tank at 40° C., and start the process after the system runs continuously for 4 hours. In the membrane separation experiment, the raw material liquid was sampled before pressurization.

[0056] Samples were taken to determine the water content and the p-tert-butylcatechol content in the crude isoprene monomer raw material liquid, respectively. After the membrane separation experiment, the water content and p-tert-butylcatechol content in the sample obtained after impurity removal were measured. At the same time, the flux of the organic solvent in the impurity removal process of the nanofiltration membrane was measured. See Table 1 for the measurement results.

Embodiment 3

[0058] To the raw material solution in Example 2, add 0.45 g of polymerization inhibitor TBC, add 4.9 g of water, open the system, keep the pressure at 1.5 MPa, control the temperature of the raw material tank with a water bath to 20 ° C, and start the system after 4 hours of continuous operation In the membrane separation experiment, the raw material was sampled before pressurization.

[0059] Samples were taken to determine the water content and the p-tert-butylcatechol content in the crude isoprene monomer raw material liquid, respectively. After the membrane separation experiment, the water content and p-tert-butylcatechol content in the sample obtained after impurity removal were measured. At the same time, the flux of the organic solvent in the impurity removal process of the nanofiltration membrane was measured. See Table 1 for the measurement results.

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Abstract

The invention relates to the field of synthetic rubber, and discloses a method for removing impurities from a synthetic rubber crude monomer by using a composite nanofiltration membrane, which comprises the step of making the synthetic rubber crude monomer contact with the composite nanofiltration membrane, wherein the composite nanofiltration membrane comprises a support membrane layer and a separation membrane layer, the molecular weight cut-off of the composite nanofiltration membrane is 100-600Da, the contact pressure is 1-6MPa, the support membrane layer is polyacrylonitrile, and the separation membrane layer is prepared from side chain modified polysiloxane shown as a formula (I). The synthetic rubber crude monomer contains water and polar organic impurities, based on the total weight of the synthetic rubber crude monomer, the content of the water is 10000 ppm or less, and the content of the polar organic impurities is 1000 ppm or less. The method is high in impurity removal rate.

Description

technical field [0001] The invention relates to the technical field of synthetic rubber, in particular to a method for removing impurities from synthetic rubber crude monomers by using a composite nanofiltration membrane. Background technique [0002] Synthetic rubber is a highly elastic polymer that is artificially synthesized. Also known as synthetic elastomer, it is one of the three major synthetic materials, has broad research prospects, and is an important strategic material. Rubber products are widely used in automotive (tyres, tapes, hoses, gaskets, molded parts, liners), industry (adhesives, gaskets, tapes, vibration dampers, cable jackets, hoses), consumer goods ( Toys, rubber mats, molded parts) and construction (wire insulation, molded parts, coils, seals and adhesives). In 2017, my country's synthetic rubber production capacity reached 6 million tons, and the market demand is large. In the production process of synthetic rubber, the polymerized monomer is usua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02
CPCB01D61/027
Inventor 辛益双赵晓冬胡保利
Owner CHINA PETROLEUM & CHEM CORP
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