Method for recovering byproduct chloromethane in maltol production

A recovery method, the technology of methyl chloride, is applied in the field of recovery of by-product methyl chloride in the production of maltol, which can solve the problems of simple impurity removal process, large energy consumption, and insufficient purity of methyl chloride, so as to achieve simple operation process and increase the output of finished products , The effect of improving the purity of the finished product

Inactive Publication Date: 2020-09-11
ANHUI JINGHE IND
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Problems solved by technology

In the prior art, the impurity removal process for methyl chloride is simple, resulting in insufficient purity of the obtained methyl chloride, and steam is used for distillation, which consumes a lot of energy

Method used

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  • Method for recovering byproduct chloromethane in maltol production

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Embodiment Construction

[0023] Such as figure 1 Shown, the recovery method of by-product methyl chloride in a kind of maltol production provided by the invention comprises the following steps:

[0024] 1) During the production process of maltol, the by-product methyl chloride raw material gas (including methyl chloride, hydrogen chloride, methanol, water, the proportions are 95%, 2%, 1%, 2% respectively) is produced at a pressure of 2KPa and a temperature of 20°C, enter the first-level alkali washing tower, and use 10% sodium hydroxide for alkali washing to remove part of the hydrogen chloride acid gas in the raw material gas of methyl chloride, and require the first-level alkali washing tower to have a pH ≥ 8;

[0025] 2) The methyl chloride gas after the primary alkali washing is pumped through the Roots machine (the outlet pressure of the Roots machine is controlled at about 0-30KPa), and then enters the primary and secondary water washing towers (the outlet flow of the primary water washing tower...

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Abstract

The invention relates to a method for recovering byproduct chloromethane in maltol production. After the chlorination reaction in maltol production is finished, chlorination liquid is subjected to hydrolysis reaction to generate methyl maltol and ethyl maltol, and chloromethane gas containing water, hydrogen chloride, methanol and other organic impurities is generated as a byproduct. According tothe method, the byproduct chloromethane is subjected to alkali washing, water washing and alkali washing again, after compression, rectification and cooling are carried out to obtain liquid chloromethane, thus reducing the impurity content in chloromethane, and reaching the purposes of impurity removing and purifying, meanwhile, chloromethane is also a maltol production raw material, and recyclingis achieved.

Description

technical field [0001] The invention relates to the field of food additive production, in particular to a recovery method for by-product methyl chloride in maltol production. Background technique [0002] Chloromethane (methyl chloride, chloromethane, CH3Cl), is a colorless flammable toxic gas, also known as methyl chloride, is a colorless and easily liquefied gas, which is liquefied and stored in steel cylinders under pressure. It is an organic halide. Slightly soluble in water, easily soluble in chloroform, ether, ethanol, acetone. Flammable, explosive, moderate hazard (poison hazard index 43). At high temperature (above 400°C) and under strong light, it reacts with methanol and hydrochloric acid with water, and generates phosgene when heated or exposed to flame. Chloromethane can be produced by the substitution reaction of methane and chlorine, which can be further halogenated. Slightly soluble in water, easily soluble in ether, benzene, etc. Non-corrosive; flammable...

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Application Information

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IPC IPC(8): C07C17/38C07C17/383C07C19/03
CPCC07C17/38C07C17/383
Inventor 许传久韩勇石剑王余杰
Owner ANHUI JINGHE IND
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