Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of devolatilization method of trans-butadiene rubber

A butyl pentylene rubber and devolatilization technology, applied in the production of bulk chemicals, etc., can solve problems such as polymer degradation, equipment blockage, and system temperature rise, and achieve the effects of simple process, good overall effect, and broad application prospects

Active Publication Date: 2022-08-02
CHAMBROAD CHEM IND RES INST CO LTD +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in actual production, such as the double-screw devolatilization process, as the volatile content continues to decrease, the viscosity of the system continues to increase. The high elasticity and high viscosity of the product hinder the interface renewal, resulting in an increase in system temperature, polymer degradation, and equipment failure. jam
If the volatile matter is removed simply by hot nitrogen purging, it can only increase the diffusion rate of the volatile matter on the polymer surface, but cannot increase the mass transfer rate of the volatile matter in the polymer.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A sample (100g) of trans-butadiene rubber was loaded into the extraction tank, and at an extraction temperature of 45°C, a supercritical fluid was introduced, and the extraction pressure was raised to 10MPa; at an extraction temperature of 45°C, the extraction pressure was 10MPa, and the flow rate was Under the condition of 5kg / h~8kg / h, the extraction is carried out for 2h; the supercritical fluid containing volatile matter obtained by extraction is exported every 15min, and then processed through separation tank 1, separation tank 2 and activated carbon adsorption device in sequence; Separation tank 2 separates supercritical fluid and volatile matter (isoprene, dimer) by means of decompression separation, supercritical fluid is adsorbed and purified by activated carbon and then transported to carbon dioxide storage tank to realize the recycling of supercritical fluid ; After the devolatilization is over, cut off the supercritical fluid inlet, slowly adjust the air valve...

Embodiment 2

[0049] A sample (100g) of trans-butadiene rubber was loaded into the extraction tank, and at an extraction temperature of 45°C, a supercritical fluid was introduced, and the extraction pressure was raised to 15MPa; at an extraction temperature of 45°C, the extraction pressure was 15MPa, and the flow rate was Under the condition of 5kg / h~8kg / h, the extraction is carried out for 2h; the supercritical fluid containing volatile matter obtained by extraction is exported every 15min, and then processed through separation tank 1, separation tank 2 and activated carbon adsorption device in sequence; Separation tank 2 separates supercritical fluid and volatile matter (isoprene, dimer) by means of decompression separation, supercritical fluid is adsorbed and purified by activated carbon and transported to carbon dioxide storage tank to realize the recycling of supercritical fluid ; After the devolatilization is over, cut off the supercritical fluid inlet, slowly adjust the air valve at t...

Embodiment 3

[0052] A sample (100g) of trans-butadiene rubber was loaded into the extraction tank, and at an extraction temperature of 55°C, a supercritical fluid was introduced, and the extraction pressure was raised to 10MPa; at an extraction temperature of 55°C, the extraction pressure was 10MPa, and the flow rate was Under the condition of 5kg / h~8kg / h, the extraction is carried out for 2h; the supercritical fluid containing volatile matter obtained by extraction is exported every 15min, and then processed through separation tank 1, separation tank 2 and activated carbon adsorption device in sequence; Separation tank 2 separates supercritical fluid and volatile matter (isoprene, dimer) by means of decompression separation, supercritical fluid is adsorbed and purified by activated carbon and then transported to carbon dioxide storage tank to realize the recycling of supercritical fluid ; After the devolatilization is over, cut off the supercritical fluid inlet, slowly adjust the air valve...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a devolatilization method for trans-butadiene rubber, comprising the following steps: a) loading the trans-butadiene rubber into an extraction tank, introducing a supercritical fluid, and raising the extraction pressure to 5 MPa to 35 MPa; The critical fluid is supercritical carbon dioxide; b) under the above-mentioned extraction pressure, the trans-butadiene rubber is extracted by the flowing supercritical fluid to obtain the supercritical fluid containing volatile matter and the extracted trans-butadiene rubber respectively; c ) depressurizing the extracted trans-butadiene rubber obtained in step b) to obtain devolatilized trans-butadiene rubber. Compared with the prior art, the devolatilization method provided by the present invention utilizes supercritical fluid to remove residual monomers and dimers in the trans-butadiene rubber. Under the process steps and conditions, a better overall effect can be achieved, the solubility of the volatiles in the fluid can be increased, the mass transfer rate of the volatiles in the polymer can be increased, and deep devolatilization can be achieved.

Description

technical field [0001] The invention relates to the technical field of polymer devolatilization, and more particularly, to a devolatilization method of trans-butadiene rubber. Background technique [0002] Trans-butadiene rubber is a new generation of functional synthetic rubber material, which has excellent fatigue resistance, wear resistance and low heat performance; at the same time, its preparation method adopts bulk polymerization, which has the advantages of simple process, low equipment investment, large production capacity, easy to use. Continuous, solvent-free, low production cost. [0003] The residual volatile matter in the polymer not only affects the performance of the product, but also causes environmental pollution and threatens people's safety and health. With the continuous improvement of people's awareness of environmental protection, safety and health, in the production process of trans-butadiene rubber, devolatilization has become the key process of post...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/00C08F236/06C08F236/08
CPCC08F6/005C08F236/06C08F236/08Y02P20/54
Inventor 翟姣崔丽云吴文雷王奇李兰阁刘宁徐继开
Owner CHAMBROAD CHEM IND RES INST CO LTD