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Device and method for removing moisture in liquid chloromethane through multi-stage drying

A technology for drying and drying of methyl chloride, which is applied in the field of devices for multi-stage drying to remove moisture in liquid methyl chloride, which can solve the problems of not giving the impurity removal method and achieve the effect of prolonging the replacement time

Active Publication Date: 2022-03-15
ANHUI JINHE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Different industries use different treatment methods when using and preparing methyl chloride. The present invention recycles the methyl chloride solvent in the production process of maltol. Since the main impurities of methyl chloride in the production process of maltol are water and partially water-soluble impurities, No suitable impurity removal method is given in the prior art

Method used

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  • Device and method for removing moisture in liquid chloromethane through multi-stage drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) 18.0m of methyl chloride to be dried 3 (0.1% water content, 98.97% purity) into the methyl chloride storage tank;

[0045] (2) Turn on the 1# circulation pump subsequently, and the methyl chloride will be 3 The amount per hour is injected into the upper part of the first-stage circulating drying bed, and the temperature of the first-stage circulating drying bed is controlled at 32.5°C. The methyl chloride is dried by the anhydrous calcium chloride in the circulating drying bed and then returned to the methyl chloride storage tank. Circulate between the primary circulating drying bed and the methyl chloride storage tank, and return the methyl chloride to the methyl chloride tank after 80.0 minutes of circulating drying (water content is 0.07%, purity 99.45%);

[0046] (3) Turn on the 2# circulation pump, and use 25.0m of methyl chloride 3 The amount per hour is injected into the upper part of the secondary circulating drying bed, and the temperature of the secondar...

Embodiment 2

[0048] (1) 18m of methyl chloride to be dried 3 (0.12% water content, 98.95% purity) into the methyl chloride storage tank;

[0049] (2) Turn on the 1# circulation pump subsequently, and the methyl chloride is 3 The amount per hour is injected into the upper part of the first-stage circulating drying bed, and the temperature of the first-stage circulating drying bed is controlled at 33.2°C. The methyl chloride is dried by the anhydrous calcium chloride in the circulating drying bed and then returned to the methyl chloride storage tank. Circulate between the primary circulating drying bed and the methyl chloride storage tank, and return the methyl chloride to the methyl chloride tank after circulating and drying for 85 minutes (water content is 0.06%, purity 99.46%);

[0050] (3) Turn on the 2# circulating pump, and use 25m of methyl chloride 3 The amount per hour is injected into the upper part of the secondary circulating drying bed, and the temperature of the secondary cir...

Embodiment 3

[0052] (1) 18m of methyl chloride to be dried 3 (0.15% water content, 98.93% purity) into the methyl chloride storage tank;

[0053] (2) Turn on the 1# circulation pump subsequently, and the methyl chloride is 30m 3 The amount per hour is put into the upper part of the primary circulating drying bed, and the temperature of the primary circulating drying bed is controlled at 30°C. The methyl chloride is dried by the anhydrous calcium chloride in the circulating drying bed and then returned to the methyl chloride storage tank. Circulate between the primary circulating drying bed and the methyl chloride storage tank, and return the methyl chloride to the methyl chloride tank after circulating and drying for 60 minutes (the water content is 0.08%, the purity is 99.43%);

[0054] (3) Turn on the 2# circulating pump, and use 25m of methyl chloride 3 The amount per hour is injected into the upper part of the secondary circulating drying bed, and the temperature of the secondary cir...

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Abstract

The invention discloses a device for removing moisture in liquid chloromethane through multi-stage drying, which is characterized in that a bottom outlet of a chloromethane storage tank is respectively connected with upper inlets of a first-stage circulating drying bed and a second-stage circulating drying bed through pipelines, and a lower outlet of the first-stage circulating drying bed is connected to the chloromethane storage tank through a pipeline; and a lower outlet of the secondary circulating drying bed is connected to an upper inlet of the secondary circulating drying bed through a pipeline and a pump. The invention further discloses a method for removing moisture in liquid chloromethane through multi-stage drying. The product produced by the method and the equipment is good in quality, and no waste is generated.

Description

[0001] This application claims the priority of a Chinese patent application with an application date of December 18, 2020, an application number of 202011505338.4, and an invention titled a device and method for multi-stage drying to remove moisture from liquid methyl chloride. technical field [0002] The invention belongs to the technical field of malt powder production, and relates to a multi-stage drying device and method for removing moisture in liquid methyl chloride. Background technique [0003] 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, by-products form methyl chloride. It still contains water (0.1%-0.2%, purity ≤99.00%) and some water-soluble impurities (such as methanol, dimethyl ether, etc.). At present, concentrated sulfuric acid drying method is mainly used for drying methyl chloride....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/02
CPCB01D17/02
Inventor 蔡永胜孟令东张学贵
Owner ANHUI JINHE IND CO LTD
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