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Method for inhibiting corrosion of butyl rubber chloromethane glycol dehydration system

A technology of butyl rubber and methyl chloride is applied in the field of inhibiting the corrosion of methyl chloride glycol dehydration system of butyl rubber, and can solve the problems of affecting the dehydration performance of glycol, increasing the scale of the device, consuming methyl chloride, etc. Corrosion, anti-corrosion effect

Active Publication Date: 2010-11-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since alcohol amines can react with methyl chloride to generate quaternary ammonium salts, glycol solution containing 10% to 30% alcohol amines will greatly consume methyl chloride on the one hand, and high-concentration quaternary ammonium salts will also increase the scale of the device on the other hand. On the other hand, high concentration of quaternary ammonium salt will also affect the dehydration performance of glycol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Ethanolamine was added to triethylene glycol to make its concentration 1000mg / L glycol (0.1% by weight), heated to 150° C., and passed into methyl chloride gas until the chloride ion concentration was constant, the pH value of the system was 6.9, and the chloride ion was 536mg / L, iron ion is 5.9mg / L, and the corrosion rate of carbon steel is 0.046mm / a.

Embodiment 2

[0036] Ethanolamine was added to triethylene glycol to make its concentration 6000mg / L glycol (0.6% by weight), heated to 150° C., and passed into methyl chloride gas until the chloride ion concentration was constant, the pH value of the system was 7.4, and the chloride ion was 3187mg / L, iron ion is 4.7mg / L, and the corrosion rate of carbon steel is 0.037mm / a.

Embodiment 3

[0038] Ethanolamine was added to triethylene glycol to make its concentration 10000mg / L glycol (1% by weight), heated to 150° C., and the chlorine methane gas was introduced until the chloride ion concentration was constant, the pH value of the system was 7.4, and the chloride ion was 5228mg / L, iron ion is 3.5mg / L, and the corrosion rate of carbon steel is 0.027mm / a.

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Abstract

The invention discloses a method for inhibiting corrosion of a butyl rubber chloromethane glycol dehydration system. The method is characterized by comprising the following steps of: adding alkylol amine into a chloromethane glycol dehydration and regeneration system; and removing chloride ions and iron ions produced in the system by using an anion exchange resin, wherein both steps cannot be saved. By using the technical scheme, a small amount of the alkylol amine is added, so the corrosion speed of carbon steel can be controlled, so that a small amount of the chloromethane is consumed and the loss of chloromethane solvent is reduced; meanwhile, the concentration of the chloride ions in the system is low and the corrosion to the carbon steel is also low; and the chloride ions and the iron ions can be removed by adopting the anion exchange resin, so the concentrations of the chloride ions and the iron ions are further reduced. Because the amount of hydrochloric acid produced by hydrolyzing the chloromethane is reduced, and the hydroxyl ions produced after the anion exchange resin exchanges the chloride ions neutralize the hydrogen ions of the system, the corrosion of the glycol dehydration and regeneration system can be greatly reduced.

Description

technical field [0001] The invention relates to a method for inhibiting the corrosion of a methyl chloride glycol dehydration system of butyl rubber, in particular to a method that focuses on solving the problem that when a butyl rubber device uses glycol to remove trace water in methyl chloride, because methyl chloride contains Hydrolysis of hydrogen chloride and methyl chloride in glycol to produce hydrochloric acid and lead to system corrosion. Background technique [0002] Butyl rubber is a rubber obtained by copolymerization of monomer isobutylene and a small amount of isoprene dissolved in the solvent methyl chloride at low temperature. Ozone, weather resistance, electrical insulation and other characteristics. Butyl rubber is mainly used in automobile bias tire inner tubes, radial tires, wires and cables, sealing materials, etc. [0003] In the production process of butyl rubber, the unreacted solvent methyl chloride and the unconverted monomers isobutylene and isop...

Claims

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Application Information

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IPC IPC(8): C08F210/12C08F6/00
Inventor 华炜梁爱民郦和生王亭王岽李博伟李长玥冯婕
Owner CHINA PETROLEUM & CHEM CORP
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