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Method for producing rare earth isoprene rubber

A rare earth isoprene rubber and isoprene technology, applied in the field of polymer production, can solve the problems of large total steam volume and high proportion of production cost and energy consumption

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At present, the weight concentration of the rare earth isoprene rubber glue obtained by the polymerization unit of the prior art is in the range of 13% to 16%, that is, the amount of solvent used to produce each ton of rare earth isoprene rubber is greater than 5 tons, so in the coagulation unit and solvent recovery The total steam consumed by the unit is relatively large, resulting in a high proportion of energy consumption in production costs

Method used

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  • Method for producing rare earth isoprene rubber
  • Method for producing rare earth isoprene rubber

Examples

Experimental program
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Embodiment 1

[0054] This embodiment adopts figure 1 The three reactors shown in the diagram are successively connected in series to carry out solution polymerization reaction, and the volume of each polymerization reactor is 120 L, and this embodiment adopts continuous process operation.

[0055] In the first reactor in the present embodiment, the feed rate of total material (including circulating glue, the same below) is 112.5kg / h, wherein the feed rate of isoprene monomer is 21.5kg / h, the amount of solvent The feed rate is 79.4kg / h, the feed rate of the catalyst is 5.6kg / h, and the feed temperature of the three materials after being cooled by the ethylene glycol refrigeration unit is -5°C to control the operating temperature of the three reactors And export conversion rate as shown in Table 1. And, the amount of the rare earth isoprene rubber glue that circulates back to the first reactor inlet is 6kg / h, and before entering the first reactor inlet, the temperature of the circulating glu...

Embodiment 2

[0057] This example is carried out using the same polymerization reactor as Example 1.

[0058] In the first reactor in this embodiment, the total feed rate of materials is 112.5 kg / h, wherein the feed rate of isoprene monomer is 21.5 kg / h, and the feed rate of solvent is 64.4 kg / h, The feed rate of the catalyst is 5.6kg / h, and the feed temperature of the three materials after being cooled by the ethylene glycol refrigeration unit is -5°C, so as to control the operating temperature and outlet conversion rate of the three reactors as shown in Table 1 Show. And, the amount of the rare earth isoprene rubber glue that circulates back to the first reactor inlet is 21kg / h, and before entering the first reactor inlet, the temperature of the circulating glue from the third reactor is cooled to 5°C. The average residence time of the material in each reactor is 40min, then after adiabatic solution polymerization, the glue solution concentration recorded at the outlet of the first reac...

Embodiment 3

[0060] This example is carried out using the same polymerization reactor as Example 1.

[0061] In the first reactor in this embodiment, the total material feed rate is 130kg / h, wherein the feed rate of isoprene monomer is 26.5 kg / h, the feed rate of solvent is 83.6 kg / h, and the catalyst The feed rate of the reactor is 6.9kg / h, and the feed temperature of the three feeds after being cooled by the ethylene glycol refrigeration unit is -10°C, so as to control the operating temperature and outlet conversion rate of the three reactors as shown in Table 1 . And, the amount of the rare earth isoprene rubber glue that circulates back to the first reactor inlet is 13kg / h, and before entering the first reactor inlet, the temperature of the circulating glue from the third reactor is cooled to 16°C. The average residence time of the material in each reactor is 35min, then after adiabatic solution polymerization, the glue concentration of the first reactor, the second reactor and the t...

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Abstract

The invention relates to the field of polymer production, and discloses a method for producing rare-earth isoprene rubber, comprising: introducing isoprene monomer, a rare-earth catalyst and a solvent into a polymerization reaction unit under solution polymerization reaction conditions to carry out polymerization reaction, And the part of the rare earth isoprene rubber glue obtained at the outlet of the polymerization reaction unit is recycled back to the entrance of the polymerization reaction unit, and the remaining part of the rare earth isoprene rubber glue is introduced into the subsequent processing unit as a crude product, wherein the Based on the total weight of all the rare earth isoprene rubber glue obtained at the outlet of the polymerization reaction unit, the rare earth isoprene rubber glue recycled to the inlet of the polymerization reaction unit is 5-25% by weight. The method of the invention can reduce the amount of solvent added in the polymerization reaction unit, thereby reducing the steam consumption for solvent recovery, and achieves a better energy-saving effect.

Description

technical field [0001] The invention relates to the field of polymer production, in particular to a method for producing rare earth isoprene rubber. Background technique [0002] Rare earth isoprene rubber is a kind of synthetic rubber, which is a polymer produced by the polymerization reaction of isoprene monomer under the action of a catalyst. [0003] Since the physical properties and mechanical properties of rare earth isoprene rubber are similar to natural rubber (NR), rare earth isoprene rubber is also called "synthetic natural rubber". Specifically, rare earth isoprene rubber has excellent elasticity, sealing, creep resistance, abrasion resistance, heat resistance and tear resistance, and its tensile strength and elongation are also close to those of natural rubber, so in some cases It can be used as a substitute for natural rubber or in combination with natural rubber or other synthetic rubber. [0004] Usually, in the production of synthetic rubber, there are main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F136/08C08F4/52
Inventor 张国娟徐林王晨静赵英
Owner CHINA PETROLEUM & CHEM CORP