Method for depriving solvent for cis-polybutadiene

A butadiene rubber and solvent removal technology, which is applied in the field of butadiene rubber solvent removal, can solve the problems of large water vapor consumption and high solvent oil consumption

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the high consumption of solvent oil and the large consumption of water vapor in the prior art, and a new method for removing solvent from butadiene rubber is provided

Method used

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  • Method for depriving solvent for cis-polybutadiene
  • Method for depriving solvent for cis-polybutadiene
  • Method for depriving solvent for cis-polybutadiene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] use figure 1As shown in the process, the stream I containing rubber glue and hot water is injected from the upper part of the first coagulation tank, the stream II containing water and solvent is discharged from the top of the first coagulation tank, and the overflow pipe on the side of the first coagulation tank Exhaust stream III, wherein the flow rate of stream III is controlled by the liquid level control system; stream III enters from the gas phase space position in the second condensation tank, and the stream containing water and solvent is extracted through Venturi, and then enters the first stream together with supplementary fresh steam At the bottom of the coagulation tank; at the bottom of the second coagulation tank, the condensed stream containing butadiene rubber is obtained; after the stream II containing water and solvent is separated, the solvent is obtained. Wherein the weight ratio of rubber glue solution and hot water in logistics I is 1: 2; In parts ...

Embodiment 2

[0025] With [Example 1], only the weight ratio of rubber glue solution and hot water in the logistics I is 1: 4; In parts by weight, the rubber glue solution comprises 20 parts of butadiene rubber, 79.99 parts of solvent and 0.01 parts The antioxidant 264 of part; The temperature of described hot water is 87 ℃; The described solvent is 61~65 ℃ distillation range oil; In described stream II, the volume ratio of water and solvent is 1:4. The operating conditions of the first condensation tank are: temperature T 1 =99°C, pressure P 1 =91KPa; the operating condition of the second condensation tank is: temperature T 2 =98°C, pressure P 2 = 40KPa.

[0026] The result is: solvent oil consumption is 74 kg / ton of rubber, water vapor consumption is 1.7 tons / ton of rubber.

Embodiment 3

[0028] With [embodiment 1], just the weight ratio of rubber glue solution and hot water in logistics I is 1: 4; In parts by weight, described rubber glue solution comprises the solvent of 20 parts of butadiene rubber and 80 parts; The temperature of the hot water is 90°C; the solvent is hexane with a distillation range of 60-75°C; in the stream II, the volume ratio of water to solvent is 1:5. The operating conditions of the first condensation tank are: temperature T 1 =101°C, pressure P 1 =88KPa; the operating condition of the second condensation tank is: temperature T 2 =100°C, pressure P 2 = 30KPa.

[0029] The result is: solvent oil consumption is 61 kg / ton of rubber, water vapor consumption is 1.6 tons / ton of rubber.

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Abstract

The invention relates to a method for depriving a solvent for cis-polybutadiene, which is mainly used for solving the problems of high consumption of solvent naphtha and large consumption of water vapor in the prior art. The technical scheme adopted by the invention comprises the following steps: a) injecting a material stream I containing rubber liquid cement and hot water from the upper part ofa first cohesion kettle, ejecting a material stream II containing water and solvent from the top of the first cohesion kettle, and ejecting a material stream III from an overflow pipe at the lateral part of the first cohesion kettle, wherein the flow capacity of the material stream III is controlled by a liquid level controlling system; b) feeding the material stream III from a gas phase spatial position in the second cohesion kettle, after the material stream containing water and solvent is drawn out by vacuum-pumping equipment, feeding the material stream containing water and solvent into the bottom of the first cohesion kettle together with the supplementary fresh steam, and carrying out cohesion, thus obtaining a material containing cis-polybutadiene at the bottom of the second cohesion kettle; and c) obtaining the solvent after the stream II containing water and solvent is subjected to separation. By utilizing the technical scheme provided by the invention, the problems in the prior art can be better solved; and the method for deprivating the solvent for cis-polybutadiene can be applicable to the industrial production for deprivating the solvent for the cis polybutadiene.

Description

technical field [0001] The invention relates to a method for removing solvent from butadiene rubber. Background technique [0002] In addition to polybutadiene, the butadiene rubber party glue still contains solvent and unreacted butadiene, which must be condensed and dried to obtain butadiene rubber products. In the process of nickel-based butadiene solution polymerization, the reaction temperature of the final reactor is generally controlled at about 95°C, and the conversion rate of butadiene can reach about 85%. In order to reduce the energy consumption and material consumption in the coagulation process, domestic butadiene rubber production facilities generally adopt heat preservation measures and glue flash evaporation technology for glue tanks. After the glue enters the glue tank, most of the unreacted butadiene is flashed and discharged from the top of the tank and recovered. The glue in the decondensation tank can be regarded as a homogeneous solution of polybutadie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C2/02C08F36/06
Inventor 袁敏健姚胜殷莲华孔雪松沈建平李春龙陈华锋
Owner CHINA PETROLEUM & CHEM CORP
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