Method for recovering byproduct chloromethane in maltol production process

A production process, technology of methyl chloride, applied in the field of recovery of by-product methyl chloride, can solve problems such as difficulty in recovery of methyl chloride

Pending Publication Date: 2021-03-30
ANHUI JINGHE IND
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  • Summary
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Problems solved by technology

[0002] The production process of maltol is divided into Grignard section, chlorination section, sublimation section, crystallization section, and drying section; among them, in the hydrolysis reaction in the chlorination section, the by-product produces methyl chloride, and the generated methyl chloride gas contains hydrogen chloride, Impurities such as dimethyl ether and methanol make it difficult to recover methyl chloride

Method used

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  • Method for recovering byproduct chloromethane in maltol production process

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Embodiment 1

[0018] see figure 1 , a method for recovering by-product methyl chloride in a maltol production process, comprising the following steps:

[0019] (1) Pass methyl chloride into the first-level alkali washing tower, add a mixture of water and liquid caustic soda into the first-level alkali washing tower as the alkali washing liquid and the pH value is ≥ 10.0, and then pass it into the import buffer tank;

[0020] (2) The methyl chloride in the inlet buffer tank is washed by two first Roots machines arranged in parallel, the washing water of the two-stage washing tower enters from the second washing tower, and the washing water of the second washing tower enters The primary water washing tower finally enters the maltol chlorination section;

[0021] (3) Methyl chloride discharged from the secondary water washing tower enters the gas cabinet, the height of the gas cabinet is maintained at 2.00m, and then pressurized to 15.0kPa by two second Roots machines arranged in parallel to ...

Embodiment 2

[0026] see figure 1 , a method for recovering by-product methyl chloride in a maltol production process, comprising the following steps:

[0027] (1) Pass methyl chloride into the first-level alkali washing tower, add a mixture of water and liquid caustic soda into the first-level alkali washing tower as the alkali washing liquid and the pH value is ≥ 10.0, and then pass it into the import buffer tank;

[0028] (2) The methyl chloride in the inlet buffer tank is washed by two first Roots machines arranged in parallel, the washing water of the two-stage washing tower enters from the second washing tower, and the washing water of the second washing tower enters The primary water washing tower finally enters the maltol chlorination section;

[0029] (3) Methyl chloride discharged from the secondary water washing tower enters the gas cabinet, the height of the gas cabinet is maintained at 2.50m, and then pressurized to 22.5kPa by two second Roots machines arranged in parallel, an...

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Abstract

The invention relates to a method for recovering byproduct chloromethane in a maltol production process. The method comprises the following steps: pumping low-pressure gaseous chloromethane from a first roots machine at an inlet of a gasometer, introducing the low-pressure gaseous chloromethane into the gasometer after passing through first-stage alkali wash, first-stage water wash, second-stage water wash and a gas-phase drying bed, performing pressurizing by a roots machine at an outlet of the gasometer, and introducing the process gas into second-stage alkali washing and third-stage alkaliwashing, and a gas-phase drying bed; and carrying out two-stage compression and three-stage rectification on the preliminarily dried gaseous chloromethane by a compressor to remove impurities step bystep, condensing the overheated gaseous chloromethane into a liquid state, and finally carrying out circulating drying to obtain the finished chloromethane. According to the method, a large number ofhigh-boiling-point and low-boiling-point impurities mixed in chloromethane generated by chlorination reaction can be removed, and a qualified chloromethane product is produced.

Description

technical field [0001] The invention relates to a method for recovering methyl chloride by-product in the production process of maltol. Background technique [0002] The production process of maltol is divided into Grignard section, chlorination section, sublimation section, crystallization section, and drying section; among them, in the hydrolysis reaction in the chlorination section, the by-product produces methyl chloride, and the generated methyl chloride gas contains hydrogen chloride, Impurities such as dimethyl ether and methanol make it difficult to recover methyl chloride. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for recovering the by-product methyl chloride in the production process of maltol, which can remove a large amount of impurities with high and low boiling points mixed in the methyl chloride generated by the chlorination reaction, and produce qualified Methyl chloride products. ...

Claims

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Application Information

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IPC IPC(8): C07C17/38C07C17/383C07C19/03C07D309/40
CPCC07C17/38C07C17/383C07D309/40
Inventor 蔡永胜钱庆华李仁昌
Owner ANHUI JINGHE IND
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