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Degassing technology in synthetic process of neoprene

A technology of neoprene and neoprene latex, which is applied in the field of degassing, can solve the problems of low monomer recovery rate, pipeline blockage, low degassing rate, etc., achieve high degassing efficiency, reduce consumption, and improve product quality.

Inactive Publication Date: 2011-07-13
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The monomer recovery rate of this method is 50-70%. The chloroprene content in the degassed latex is below 1%. The degassing rate is low, the monomer recovery rate is low, and there are also gels on the equipment and pipelines during the recovery process. clogging problem

Method used

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  • Degassing technology in synthetic process of neoprene
  • Degassing technology in synthetic process of neoprene
  • Degassing technology in synthetic process of neoprene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The primary degassing is carried out under vacuum 220mmHg.

[0032] Firstly, superheated steam (126° C.) is cooled by adding desalted water in the steam desuperheater, and the temperature of the steam is controlled at 102° C., and enters the primary degassing pipe 2 from the steam inlet 20 . Undegassed latex (22°C) at 9.5m 3 The flow rate of / h enters the primary degassing pipe 2 from the non-degassed latex inlet 21. The degassed latex and steam are directly mixed in the primary degassing pipe 2 for steam stripping. The mixing ratio of steam and latex is 0.31:1 (wt). The primary degassing pipe 2 consists of three sections with an inner diameter of 100mm and a length of 10500mm. The undegassed latex is mixed with steam in the primary degassing pipe 2, diluted and heated to 58°C, the unreacted CD in the latex is vaporized, and the CD-containing latex foam enters the primary separator 3 from the tangential direction, and the emulsion is separated along the primary stage ...

Embodiment 2

[0038] The primary degassing is carried out under vacuum 200mmHg.

[0039] First, superheated steam (128°C) is cooled by adding desalted water in the steam desuperheater, the steam temperature is controlled at 105°C, and enters the primary degassing pipe 2 from the steam inlet 20 . Undegassed latex (23°C) at 7.5m 3 The flow rate of / h enters the primary degassing pipe 2 from the non-degassed latex inlet 21. The degassed latex and steam are directly mixed in the primary degassing pipe 2 for steam stripping. The mixing ratio of steam and latex is 0.25:1 (wt). The primary degassing pipe 2 consists of three sections with an inner diameter of 100mm and a length of 11000mm. The undegassed latex is mixed with steam in the primary degassing pipe 2, diluted and heated to 62°C, the unreacted CD in the latex is vaporized, and the CD-containing latex foam enters the primary separator 3 from the tangential direction, and the emulsion is separated along the primary stage The inner wall of...

Embodiment 3

[0045] The primary degassing is carried out under vacuum 180mmHg.

[0046] Firstly, superheated steam (132° C.) is cooled by adding desalted water in the steam desuperheater, and the temperature of the steam is controlled at 108° C., and enters the primary degassing pipe 2 from the steam inlet 20 . Undegassed latex (25°C) at 5.5m 3 The flow rate of / h enters the primary degassing pipe 2 from the non-degassed latex inlet 21. The degassed latex and steam are directly mixed in the primary degassing pipe 2 for steam stripping. The mixing ratio of steam and latex is 0.18:1 (wt). The primary degassing pipe 2 consists of three sections with an inner diameter of 100mm and a length of 11500mm. The undegassed latex is mixed with steam in the primary degassing pipe 2, diluted and heated to 64°C, the unreacted CD in the latex is vaporized, and the CD-containing latex foam enters the primary separator 3 from the tangential direction, and the emulsion is separated along the primary stage ...

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PUM

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Abstract

The invention discloses a degassing technology in the synthetic process of neoprene. The technology comprises the following steps: neoprene latex with chloroprene monomer enters a first-stage degassing pipe; under the vacuum condition, steam and neoprene latex enter a first-stage separator after steam stripping to obtain first-stage separated gas and first-stage separated neoprene latex; the first-stage separated gas enters a second-stage separator to obtain second-stage separated gas and second-stage separated neoprene latex, the second-stage separated gas enters a third-stage separator to obtain third-stage separated gas and third-stage separated neoprene latex, the third-stage separated gas passes through a water condenser, a chloroprene recycling condenser and a tail gas condenser so that water, chloroprene monomer and toluene are condensed, tail gas is sucked in a first-stage ejector, the ejector is emptied; the first-stage separated neoprene latex, the second-stage separated neoprene latex and the third-stage separated neoprene latex are mixed to enter a second-stage degassing pipe, the mixed gas is flashed under high vacuum degree and then performs first-stage separation twice to obtain final neoprene latex and twice separated gas; the twice separated gas enter first-stage separation twice to obtain final separated gas and final neoprene latex; and the final separated gas is cooled, is sucked by a second-stage ejector and enters a third-stage separator. The process disclosed by the invention has high degree of degassing and high monomer recovery rate which can be more than 90%, the process has low energy consumption; and by adopting the process, the quality of the neoprene product can be increased.

Description

technical field [0001] The invention relates to a process for degassing during the synthesis of chloroprene rubber. Background technique [0002] Neoprene has many excellent properties such as aging resistance, heat resistance, cold resistance, flame resistance, oil resistance, etc., so it has been widely used in the fields of automobile manufacturing, construction, and industrial rubber products such as rubber hoses and conveyor belts. . [0003] With the expansion of the application field of chloroprene rubber in my country and the continuous growth of demand, the quality and variety structure of rubber should adapt to market changes and make corresponding adjustments to develop diversified, serialized, functional and high-performance chloroprene rubber. products, and the existing neoprene latex degassing technology does not meet the requirements, which greatly restricts the development of the neoprene rubber industry, and greatly limits the variety and quality of neoprene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/18C08C1/04B01D19/00
Inventor 蔡晋丽闫少伟时建敏李改英李素伟
Owner SEDIN ENG
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