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Bromomethane impurity removal process adopting weak base

A methyl bromide and process technology, which is applied in the field of methyl bromide impurity removal process using a weak base, can solve the problems of low methyl bromide yield and high loss rate of methyl bromide, and achieve the effects of low corrosion performance, reduced energy consumption for impurity removal, and improved yield

Inactive Publication Date: 2020-12-08
临海市建新化工有限公司
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  • 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 to wash methyl bromide with low-concentration strong alkali, then dry it with sulfuric acid and then condense it for collection. The yield of methyl bromide is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of methyl bromide impurity removal process that adopts weak base comprises the following steps:

[0031] Step 1: Methyl bromide gas is passed into the first absorption tower with a ventilation rate of 220m³ / h from the bottom of the first absorption tower, and is discharged from the top of the first absorption tower; the weak base solution containing sodium acetate and barium carbonate is The spray volume of 1.5m³ / h is sprayed from the top of the first absorption tower and discharged from the bottom of the first absorption tower; among them, the pH of the weak alkali solution is 9, and the height of the packing layer is 3m; methyl bromide is passed into the first absorption tower The temperature of the tower is 25° C., the temperature of the weak base solution spraying is 30° C., and the pressure inside the first absorption tower is 1.4 atm.

[0032] Step 2: the methyl bromide discharged in step 1 is passed into the second absorption tower from the bottom of the s...

Embodiment 2

[0035] A kind of methyl bromide impurity removal process that adopts weak base comprises the following steps:

[0036] Step 1: Methyl bromide gas is passed into the first absorption tower from the bottom of the first absorption tower with a ventilation rate of 224m³ / h, and discharged from the top of the first absorption tower; the weak base solution containing sodium carbonate and sodium bicarbonate Spray from the top of the first absorption tower with a spray rate of 1.75m³ / h, and discharge from the bottom of the first absorption tower; wherein, the pH of the weak alkali solution is 8.5, and the height of the packing layer is 3.25m; The temperature of the first absorption tower is 27.5°C, the temperature of the weak alkali solution spraying is 35°C, and the pressure inside the first absorption tower is 1.45atm.

[0037] Step 2: the methyl bromide discharged in the step 1 is passed into the second absorption tower with the ventilation rate of 224m³ / h from the bottom of the sec...

Embodiment 3

[0040] A kind of methyl bromide impurity removal process that adopts weak base comprises the following steps:

[0041] Step 1: Methyl bromide gas is passed into the first absorption tower with a ventilation rate of 228m³ / h from the bottom of the first absorption tower, and discharged from the top of the first absorption tower; the weak base solution containing sodium carbonate and sodium bicarbonate Spray from the top of the first absorption tower with a spray volume of 2m³ / h, and discharge from the bottom of the first absorption tower; wherein, the pH of the weak alkali solution is 8, and the height of the packing layer is 3.5m; methyl bromide is passed into the first The temperature of the absorption tower is 30° C., the temperature of the weak base solution spraying is 40° C., and the pressure inside the first absorption tower is 1.5 atm.

[0042] Step 2: the methyl bromide discharged in the step 1 is passed into the second absorption tower with the ventilation rate of 228m...

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Abstract

The invention relates to a bromomethane impurity removal process adopting weak base, which belongs to the field of bromomethane purification. The process comprises the following steps: step 1, introducing bromomethane into a tower from the bottom of a first absorption tower, spraying a weak base solution with the pH value of 8-10 from the top of the first absorption tower, and neutralizing bromomethane; and step 2, introducing the bromomethane obtained in the step 1 into the tower from the bottom of a second absorption tower, spraying a sulfuric acid solution from the top of the second absorption tower, and drying the bromomethane, the weak base solution being prepared from weak base and water. The process has the effects of reducing the loss rate of bromomethane and improving the impurityremoval yield of 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 a weak base. 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 preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/395C07C19/075
CPCC07C17/395C07C19/075
Inventor 苏长流金则兵李奇闫博芊王斌
Owner 临海市建新化工有限公司
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