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

A methyl chloride and drying technology is applied in the field of devices for multi-stage drying to remove moisture in liquid methyl chloride, which can solve the problems of intractable treatment of waste acid, restrict the recycling and utilization of methyl chloride, etc., and achieve the effect of prolonging the replacement time.

Inactive Publication Date: 2021-05-04
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, concentrated sulfuric acid drying method is mainly used for the drying of methyl chloride. Although the drying effect is good, the problem of difficult disposal of waste acid cannot be well solved, which seriously restricts the recycling of methyl chloride.

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

[0027] (1) 18.0m of methyl chloride to be dried 3 (water content 0.1%, purity 98.97%) into the methyl chloride storage tank;

[0028] (2) Then turn on the 1# circulating pump to pump the methyl chloride at 25.0m 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%);

[0029] (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 secondary ci...

Embodiment 2

[0031] (1) 18m of methyl chloride to be dried 3 (water content 0.12%, purity 98.95%) into the methyl chloride storage tank;

[0032] (2) Then turn on the 1# circulating pump, and feed the methyl chloride at 25m 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 first-stage circulating drying bed and the methyl chloride storage tank, and return the methyl chloride to the methyl chloride tank after 85 minutes of circulating drying (water content is 0.06%, purity 99.46%);

[0033] (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

[0035] (1) 18m of methyl chloride to be dried 3 (water content 0.15%, purity 98.93%) into the methyl chloride storage tank;

[0036] (2) Then turn on the 1# circulating pump, and feed the methyl chloride at 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 (water content is 0.08%, purity 99.43%);

[0037] (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 circulating dryin...

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Abstract

The invention relates to a device and a method for removing moisture in liquid chloromethane through multi-stage drying. The method is characterized by comprising the following steps: (1) pumping chloromethane to be dried into a chloromethane storage tank; (2) pumping chloromethane into the upper part of a first-stage circulating drying bed at a speed of 20-30m < 3 > / h, controlling the temperature of the first-stage circulating drying bed to be 30-35 DEG C, controlling the chloromethane to circulate between the first-stage circulating drying bed and the chloromethane storage tank, and returning the chloromethane to the chloromethane storage tank after circulating drying for 60-120 minutes; (3) pumping chloromethane subjected to primary drying into the upper part of a secondary circulating drying bed at a speed of 20-30m < 3 > / h, controlling the temperature of the secondary circulating drying bed to be 30-35 DEG C, drying chloromethane by anhydrous calcium chloride in the circulating drying bed, returning the chloromethane to the upper part of the secondary circulating drying bed under the action of a pump, and controlling the chloromethane to self-circulate in the secondary circulating drying bed, and circularly drying for 60-120 minutes, and then conveying chloromethane to a finished product tank area. The method has the advantages that the water content in the chloromethane is reduced to 0.05% or below from 0.1%-0.2%, and the purity is improved to 99.50% or above from the original purity of 99.00% or below.

Description

technical field [0001] 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 [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, 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. Although the drying effect is good, the problem of difficult disposal of waste acid cannot be well solved, which seriously restricts the recycling and utilization of methyl chloride. Contents of the invention [0003] The purpose of the present invention is to provide a mul...

Claims

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Application Information

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IPC IPC(8): B01D17/02
CPCB01D17/02
Inventor 蔡永胜孟令东张学贵
Owner ANHUI JINGHE IND
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