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Device and method for removing siloxane in dilute sulfuric acid

A technology of dilute sulfuric acid and siloxane, which is applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of shortening the operation period of the device, difficult cleaning of pipelines and equipment, blockage of pipelines and equipment, etc., and achieves less daily maintenance workload and equipment Easy installation and maintenance, to achieve the effect of filtering function

Active Publication Date: 2014-05-28
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the hydrogen chloride in the synthesis of methyl chloride is recovered from the dimethyl hydrolysis process (this process is to hydrolyze and dechlorinate dimethyl dichlorosilane to produce a large amount of HCL, part of which is desorbed to generate HCL gas as a raw material for the production of methyl chloride), Contains siloxane impurities, so that the dilute sulfuric acid obtained after drying the methyl chloride also contains siloxane and other impurities, which will cause blockage of the pipelines and equipment of the dilute sulfuric acid concentration device, shorten the operating cycle of the device, and the pipelines and equipment polluted by siloxane difficult to clean
In the past domestic and foreign patents and literature, there are few reports on the purification treatment of dilute sulfuric acid as raw material of the dilute sulfuric acid concentration device

Method used

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  • Device and method for removing siloxane in dilute sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A device for removing siloxane in dilute sulfuric acid, which includes a first purifier 7a, a second purifier 7b, a waste liquid collection tank 9, a dilute sulfuric acid storage tank 8, a first purifier initial pressure gauge 5a, a second purifier Initial pressure gauge 5b, end pressure gauge 6a of the first purifier, end pressure gauge 6b of the second purifier, material inlet valve 1a of the first purifier, material inlet valve 1b of the second purifier, backwash valve 4a of the first purifier , the second purifier backwash valve 4b, the first purifier filtrate outlet valve 3a, the second purifier filtrate outlet valve 3b, the first purifier dirt outlet valve 2a, the second purifier dirt outlet valve 2b; One end of the purifier 7a and the second purifier 7b are respectively connected to the first purifier material inlet valve 1a and the second purifier material inlet valve 1b through pipelines, and the tops of the first purifier 7a and the second purifier 7b are respe...

Embodiment 2

[0021] Dilute sulfuric acid enters the first purifier 7a and the second purifier 7b under a pressure of 0.6Mpa;

[0022] Backwashing operation: record the pressure difference between the initial pressure gauge 5a of the first purifier and the final pressure gauge 6a of the first purifier during operation. When the pressure difference reaches 0.4Mpa, start the backwashing system, and use water with a pressure of 0.3Mpa to the first purifier. One purifier 7a is backwashed for 5 seconds; in the same way, record the pressure difference between the second purifier initial pressure gauge 5b and the second purifier end pressure gauge 6b, when the pressure difference reaches 0.4Mpa, start the backwash system, for the second Purifier 7b carries out backwashing operation;

[0023] All the other are with embodiment 1.

Embodiment 3

[0025] Dilute sulfuric acid enters the first purifier 7a and the second purifier 7b under a pressure of 0.7Mpa;

[0026] Backwashing operation: record the pressure difference between the initial pressure gauge 5a of the first purifier and the final pressure gauge 6a of the first purifier during operation. When the pressure difference reaches 0.6Mpa, start the backwashing system, and use water with a pressure of 0.4Mpa to the first purifier. One purifier 7a backwashes for 15 seconds; Similarly, record the pressure difference between the second purifier initial pressure gauge 5b and the second purifier end pressure gauge 6b, when the pressure difference reaches 0.6Mpa, start the backwash system, and the second Purifier 7b carries out backwashing operation;

[0027] All the other are with embodiment 1.

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Abstract

The invention relates to a method for removing siloxane in dilute sulfuric acid. A processing device used for removing siloxane in the dilute sulfuric acid comprises multiple sets of purifiers, and is provided with the purifiers and a backwashing system; asymmetric glass fiber membrane filtering cores are mounted in the purifiers; the dilute sulfuric acid from a dilute sulfuric acid accumulator tank of a dilute sulfuric acid concentration device enters into the purifiers to be purified, and clear liquid flows out of a material outlet at the upper part of a purification system into a storage tank; and when the pressure difference of the inner pressure and the outer pressure of the filter material of the purifiers reaches 0.4-0.6 Mpa, the backwashing system is started to carry out backwashing, and sewage flows out from a sewage outlet through backwashing. The method and the device can effectively remove siloxane in the dilute sulfuric acid, avoid equipment blockage and realize automatic control, the operation is safe, and the failure rate is low.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a device and method for removing siloxane in dilute sulfuric acid. Background technique [0002] Chloromethane is an important raw material for organosilicon production. The synthesis of chloromethane is obtained by reacting hydrogen chloride recovered from dimethyl hydrolysis with methanol, and is often dried with concentrated sulfuric acid to obtain methyl chloride that meets the quality required for the synthesis of organosilicon monomers; During the drying process, the concentrated sulfuric acid absorbs the water in the methyl chloride and gradually becomes dilute sulfuric acid. In order to reduce the cost, the dilute sulfuric acid can be concentrated with a dilute sulfuric acid concentration device to obtain concentrated sulfuric acid, which is then used for drying the methyl chloride. However, since the hydrogen chloride in the synthesis of methyl chloride is recovered from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90
Inventor 白丽娜邱玲
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD