Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Methyl bromide impurity removal process adopting strong base

A technology of methyl bromide and process, which is applied in the field of impurity removal process of methyl bromide using strong alkali, can solve the problems of cumbersome operation, low purity of methyl bromide, high energy consumption, etc., and achieve the effect of improving purity, reducing energy consumption, and thoroughly removing impurities

Pending Publication Date: 2020-12-08
临海市建新化工有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the impurity removal process for methyl bromide is generally washed with low-concentration strong alkali, then dried by sulfuric acid and then compressed to obtain methyl bromide. The purity of methyl bromide obtained by this impurity removal process is not high, and the strong alkali after use needs to be concentrated and crystallized , separation and other steps before discharge, cumbersome operation, high energy consumption

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of methyl bromide impurity removal process that adopts strong alkali comprises the following steps:

[0030] (1) Neutralization treatment: Methyl bromide gas is passed into the first absorption tower from the bottom of the first absorption tower at a ventilation rate of 240m³ / h, and discharged from the top of the first absorption tower; hydrogen with a mass concentration of 15% Sodium oxide solution is sprayed from the top of the first absorption tower with a spray rate of 1m³ / h, and discharged from the bottom of the first absorption tower; wherein, the height of the packing layer is 2m; the temperature at which methyl bromide passes into the first absorption tower is 20 ℃, the temperature of sodium hydroxide solution spraying is 20 ℃, and the tower internal pressure of the first absorption tower is 90kPa.

[0031] (2) Drying treatment: the methyl bromide discharged in the step (1) is passed into the second absorption tower from the bottom of the second absorptio...

Embodiment 2

[0034] A kind of methyl bromide impurity removal process that adopts strong alkali comprises the following steps:

[0035] (1) Neutralization treatment: Methyl bromide gas is passed into the first absorption tower from the bottom of the first absorption tower at a ventilation rate of 243m³ / h, and discharged from the top of the first absorption tower; hydrogen with a mass concentration of 20% Sodium oxide solution is sprayed from the top of the first absorption tower with a spray rate of 1.3m³ / h, and discharged from the bottom of the first absorption tower; wherein, the height of the packing layer is 2.8m; the temperature at which methyl bromide passes into the first absorption tower The temperature is 25°C, the temperature of sodium hydroxide solution spraying is 30°C, and the pressure inside the first absorption tower is 100kPa.

[0036] (2) Drying treatment: the methyl bromide discharged in the step (1) is passed into the second absorption tower from the bottom of the second...

Embodiment 3

[0039] A kind of methyl bromide impurity removal process that adopts strong alkali comprises the following steps:

[0040] (1) Neutralization treatment: Methyl bromide gas is passed into the first absorption tower from the bottom of the first absorption tower at a ventilation rate of 246m³ / h, and discharged from the top of the first absorption tower; hydrogen with a mass concentration of 21% Sodium oxide solution is sprayed from the top of the first absorption tower with a spray rate of 1.6m³ / h, and discharged from the bottom of the first absorption tower; wherein, the height of the packing layer is 3.5m; the temperature at which methyl bromide is passed into the first absorption tower is 30°C, the temperature of sodium hydroxide solution spraying is 35°C, and the pressure inside the first absorption tower is 110kPa.

[0041] (2) Drying treatment: the methyl bromide discharged in step (1) is passed into the second absorption tower from the bottom of the second absorption tower...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a methyl bromide impurity removal process adopting strong alkali, which belongs to the field of methyl bromide purification. The process comprises the following steps: (1), performing neutralization treatment: introducing methyl bromide gas into alkali liquor for neutralization treatment; and (2), performing drying treatment: introducing bromomethane obtained in the step (1) into a sulfuric acid solution for drying treatment. The alkali liquor is a sodium hydroxide solution with the mass concentration of 15-26%. The process disclosed by the invention has the effects ofsimple operation, low energy consumption and high purity of the obtained bromomethane.

Description

technical field [0001] The invention relates to the technical field of methyl bromide removal of impurities, in particular to a methyl bromide removal process using strong alkali. Background technique [0002] Methyl bromide, also known as methyl bromide or methyl bromide, is a colorless, odorless liquid with a boiling point of 3.6°C and is slightly soluble in water. It has a strong fumigation effect and can kill various harmful organisms efficiently and broadly. It has a strong penetrating ability to the soil and can penetrate into undecomposed organisms, so as to achieve the purpose of killing insects, preventing diseases and weeding. [0003] The production process of methyl bromide is generally to react sulfur with bromine, and add water to the reaction system, so that the produced sulfur bromide is hydrolyzed into hydrobromic acid and sulfuric acid, and then hydrobromic acid reacts with methanol to generate methyl bromide. The methyl bromide prepared by the preparatio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C17/395C07C19/075
CPCC07C17/395C07C19/075
Inventor 苏长流王进利侯华民王斌
Owner 临海市建新化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com