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Method for recovering chloromethane from byproduct hydrochloric acid and recovery device

A technology of by-product hydrochloric acid and methyl chloride, which is applied in the field of recycling technology, can solve the problems of complex processing process, high processing cost, unfavorable industrial scale use, etc., and achieve the effect of reducing VOC content, simple analysis process, and reducing equipment material requirements

Active Publication Date: 2018-06-29
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilizing this method needs to use an ozone generator to prepare ozone. In addition, the photocatalytic process requires titanium dioxide semiconductor as a catalyst. The catalytic performance will directly affect the treatment effect on wastewater, resulting in complex processes and high treatment costs in the entire treatment process, which is not conducive to industrial scale use.

Method used

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  • Method for recovering chloromethane from byproduct hydrochloric acid and recovery device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A device for recovering methyl chloride from by-product hydrochloric acid, the structure is as follows figure 1 As shown, the device includes an analytical tower 3, which includes a tower body, the tower body is a vertical structure, the top of the tower body is provided with a gas outlet, the bottom of the tower body is provided with a liquid outlet, and the tower body is provided with a liquid feed inlet and The gas feed port, from top to bottom in the tower body, consists of a gas zone, an analysis zone and a liquid zone in sequence, and the analysis zone is filled with fillers; the liquid feed port is connected to the by-product hydrochloric acid buffer tank 1 through the feed pump 2, and the liquid outlet passes through The discharge pump 4 is connected with the hydrochloric acid storage tank 5, and the gas outlet is connected with the mixer 6 through a pipeline.

[0040] The height of the analysis area accounts for 1 / 2 of the height of the tower body, and the pack...

Embodiment 2

[0047] Utilize the device of embodiment 1 to reclaim the methyl chloride method from by-product hydrochloric acid, may further comprise the steps:

[0048] (1) the by-product hydrochloric acid (chloromethane content 2.25%) that concentration is 24% utilizes feed pump to pass into from the liquid feed inlet of desorption tower with the flow velocity of 1.12 tons / hour, and the feed temperature of by-product hydrochloric acid is 55 ℃ ℃; the mixed gas of hydrogen chloride and methyl chloride enters from the gas inlet, and the feeding amount is 0.5m 3 / h, wherein the volume ratio of methyl chloride is 6.0%.

[0049] (2) The by-product hydrochloric acid enters the analysis area through the liquid distributor to absorb hydrogen chloride in the tail gas. The analysis tower uses the reboiler at the bottom of the tower to provide the heat source; the reboiler heats the tower body to keep the temperature of the tower body at 65 ° C. The pressure is 28KPa; after analysis, the volume rati...

Embodiment 3

[0052] Utilize the device of embodiment 1 to reclaim the methyl chloride method from by-product hydrochloric acid, may further comprise the steps:

[0053] (1) the by-product hydrochloric acid (chloromethane content 1.56%) that concentration is 20% utilizes desorption tower feed pump to pass into from the liquid feed inlet of desorption tower with the flow velocity of 1.4 tons / hour, the feed temperature of by-product hydrochloric acid The temperature is 50°C; the mixed gas of hydrogen chloride and methyl chloride enters from the gas feed port, and the feed amount is 0.5m 3 / h, wherein the volume ratio of methyl chloride is 5.4%.

[0054] (2) The by-product hydrochloric acid enters the analysis area through the liquid distributor to absorb hydrogen chloride in the tail gas. The analysis tower uses the reboiler at the bottom of the tower to provide the heat source; the reboiler heats the tower body to keep the temperature of the tower body at 80 ° C. The pressure is 32KPa; afte...

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Abstract

The invention relates to a method for recovering chloromethane from byproduct hydrochloric acid and a recovery device. The desorption temperature and low-pressure conditions of the method are met at the same time, so that the chloromethane in the byproduct hydrochloric acid is thoroughly separated; the purity of the chloromethane is greater than 98 percent; the hydrochloric acid mass concentrationis 20 to 25 percent; the chloromethane content is 100 ppm or below; the desorption process is simple; the operation is easy; chemical reagents are not needed; safety and environment protection are realized. The investment of the recovery device is low; the operation is easy; green and environment-friendly effects are achieved; the chloromethane in the byproduct hydrochloric acid can be effectively separated and recovered; the device is also applicable to the separation of other methane chlorides in the byproduct hydrochloric acid. The obvious technical economic benefits are realized.

Description

Technical field: [0001] The invention relates to a method and a recovery device for recovering methyl chloride from by-product hydrochloric acid, belonging to the technical field of recovery technology. Background technique: [0002] Chloromethane is an important raw material in the organic synthesis industry. In addition to further chlorination to produce dichloromethane and chloroform, it is mainly used to produce organic silicon intermediate methylsilane, and methylchlorosilane is used to produce a series of silicone oil and silicone rubber. It is used as an intermediate of silicone resin; as a solvent for butyl rubber polymerization catalysts, as an extractant for heat-sensitive substances, and can also be used in the production of tetramethyl lead, methyl cellulose and herbicides. [0003] In the production process of methyl chloride, a large amount of by-product hydrochloric acid will be generated, and the concentration of these hydrochloric acids is about 20-25%, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C19/03C01B7/07
CPCC01B7/0706C07C17/38C07C19/03
Inventor 路国伟刘凯强张晶群徐学军
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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