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Solvent and cleaning method for cleaning butyl rubber polymerization reactor

A polymerization reactor, butyl rubber technology, applied in chemical instruments and methods, cleaning methods and utensils, cleaning methods using liquids, etc., can solve the problems of long cleaning time, high cleaning solvent distillation range and high energy consumption, and achieve The effect of reducing material consumption and energy consumption, good cleaning effect and long running time

Inactive Publication Date: 2019-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cleaning solvent used in this method has a high distillation range and needs to be regenerated with medium-pressure steam, which has high energy consumption; the cleaning time is long, requiring 6 to 8 hours, and the remaining high-concentration glue after the cleaning solvent regeneration can only be sold as a by-product and cannot be directly Reuse, high material consumption

Method used

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  • Solvent and cleaning method for cleaning butyl rubber polymerization reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The solvent composition of cleaning butyl rubber polymerization reactor: based on the total amount of solvent, C 6 aliphatic alkanes and C 6 The total content of cycloaliphatic alkanes is 99.97wt%, wherein the content of n-hexane is 88.37wt%, C 5 aliphatic alkanes, C 7 aliphatic alkanes, C 5 cycloaliphatic alkanes and C 7 The total content of alicyclic alkanes is 150ppm, the bromine value of the solvent is 15mg / 100g, and the distillation range of the solvent is 68-70.5°C.

[0048] (1) Send 13000kg of the above-mentioned solvent into the storage tank, and pump it at a rate of 75m 3 The flow rate per hour is sent to the polymerization reactor of butyl rubber, and at the same time, the stirring of the polymerization reactor is started to obtain a solution containing butyl rubber, and a small amount of low-pressure liquid ethylene is passed into the heat exchange tube of the polymerization reactor to control the temperature of the solvent The temperature is 45°C, and t...

Embodiment 2

[0057] The solvent composition of cleaning butyl rubber polymerization reactor: based on the total amount of solvent, C 6 aliphatic alkanes and C 6 The total content of cycloaliphatic alkanes is 99.95wt%, wherein the content of n-hexane is 85.1wt%, C 5 aliphatic alkanes, C 7 aliphatic alkanes, C 5 cycloaliphatic alkanes and C 7 The total content of alicyclic alkanes is 200ppm, the bromine value of the solvent is 30mg / 100g, and the distillation range of the solvent is 68-70.5°C.

[0058] (1) Send 13000kg of the above-mentioned solvent into the storage tank, and pump it at a rate of 60m 3 The flow rate per hour is sent to the polymerization reactor of butyl rubber, and at the same time, the stirring of the polymerization reactor is started to obtain a solution containing butyl rubber, and a small amount of low-pressure liquid ethylene is passed into the heat exchange tube of the polymerization reactor to control the temperature of the solvent The temperature is 35°C, and th...

Embodiment 3

[0065] The solvent composition of cleaning butyl rubber polymerization reactor: based on the total amount of solvent, C 6 aliphatic alkanes and C 6 The total content of cycloaliphatic alkanes is 99.93wt%, wherein the content of n-hexane is 87.0wt%; C 5 aliphatic alkanes, C 7 aliphatic alkanes, C 5 cycloaliphatic alkanes and C 7 The total content of alicyclic alkanes is 50ppm, the bromine value of the solvent is 20mg / 100g, and the distillation range of the solvent is 68-70.5°C.

[0066] (1) Send 13000kg of the above-mentioned solvent into the storage tank, and pump it at a rate of 90m 3The flow rate per hour is sent to the polymerization reactor of butyl rubber, and at the same time, the stirring of the polymerization reactor is turned on to obtain a solution containing butyl rubber, and the solution containing butyl rubber flowing out from the polymerization reactor passes through a heat exchanger to control the solution with circulating water The temperature is 50°C, and...

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Abstract

The invention relates to the field of butyl rubber, and discloses a solvent and a cleaning method for cleaning a butyl rubber polymerization reactor. The solvent for cleaning the butyl rubber polymerization reactor contains C5-C7 aliphatic alkane and / or C5-C7 alicyclic alkane, the bromine value of the solvent is less than 35 mg / 100 g, and the distillation range is 60-80 DEG C. The method for cleaning the butyl rubber polymerization reactor comprises the following step that a solvent is in contact with the butyl rubber polymerization reactor, and a solution containing butyl rubber is obtained,wherein the solvent is the solvent provided by the invention. According to the cleaning method provided by the invention, the cleaning time is short, and the cleaning solvent does not need to be regenerated, so that material consumption and energy consumption are reduced; the running time of the cleaned butyl rubber polymerization reactor is long; and the cleaning effect is good.

Description

technical field [0001] The invention relates to the technical field of butyl rubber, in particular to a cleaning method for a butyl rubber polymerization reactor. Background technique [0002] The polymerization reaction of butyl rubber is a typical cationic polymerization reaction, and the reaction speed is extremely fast. Butyl polymerization is an exothermic reaction that must be performed at extremely low temperatures to obtain useful commercial products. In the industrial production process of butyl rubber, due to the uneven distribution of the catalyst, the concentration of heat causes local overheating or the existence of harmful substances in the monomer, forming oligomers and adhering to the inner wall of the reactor to form a bonded gel, causing the reactor The heat exchange capacity decreased, and the polymerization reaction temperature, pressure and stirring current increased. When the temperature rises to the required temperature upper limit, the reactor must ...

Claims

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Application Information

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IPC IPC(8): C11D7/24C11D7/60C08F8/22B08B3/08C08F210/12
CPCB08B3/08C08F8/22C11D7/00C11D7/241C11D7/245C08F210/12
Inventor 孟伟娟邱迎昕张雷周新钦
Owner CHINA PETROLEUM & CHEM CORP
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