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Treatment method for waste gas produced in preparation process of sodium hydrosulfite

A sodium dithionite and preparation process technology, applied in the field of design waste gas treatment, can solve the problems of unpleasant smell of waste gas, increase sulfur dioxide, methanol consumption, etc., and achieve the effect of removing peculiar smell

Active Publication Date: 2010-03-17
烟台金海化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following two deficiencies in this method. 1. There are sulfur dioxide and methanol in the discharged waste gas, so the consumption of sulfur dioxide and methanol in the raw material is increased; 2. The treated waste gas has a special unpleasant smell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for treating waste gas produced during the preparation of sodium dithionite, wherein the method is carried out in sequence as follows: (1) cold methanol absorption: the waste gas passes through two packed towers successively, and is countercurrently washed and absorbed with methanol at a temperature of -20°C , to absorb the harmful gases produced by sulfur dioxide, methanol and methyl formate sodium dithionite in the exhaust gas, and the formaldehyde liquid that absorbs sulfur dioxide, methanol and methyl formate can be returned to the production process of sodium dithionite for use as raw materials; (2) cold alkali Liquid absorption: In the packed tower, use a 20% sodium hydroxide solution with a temperature of -5°C to countercurrently wash the waste gas produced by sodium dithionite to absorb sulfur dioxide and carbon dioxide in the waste gas; (3) Oxidative absorption: In the oxidation absorption tower In the packed tower, use 10% hydrogen peroxide solution at...

Embodiment 2

[0021] A method for treating waste gas produced during the preparation of sodium dithionite, wherein the method is carried out in sequence as follows: (1) cold methanol absorption: the waste gas passes through two packed towers successively, and the methanol with a temperature of 15°C is used for countercurrent washing and absorption, To absorb the harmful gas produced by sulfur dioxide, methanol and methyl formate sodium dithionite in the waste gas, and the formaldehyde liquid that absorbs sulfur dioxide, methanol and methyl formate can be returned to the production process of sodium dithionite for use as raw materials; (2) cold lye Absorption: In the packed tower, countercurrently wash the waste gas produced by sodium dithionite with a 5% sodium hydroxide solution at a temperature of 10°C to absorb sulfur dioxide and carbon dioxide in the waste gas; (3) Oxidation absorption: In the oxidation absorption tower, In the packed tower, use a 15% hydrogen peroxide solution at a temp...

Embodiment 3

[0023] A method for treating waste gas produced during the preparation of sodium dithionite, wherein the method is carried out in sequence as follows: (1) cold methanol absorption: the waste gas passes through two packed towers successively, and the methanol with a temperature of 0° C. is used for countercurrent washing and absorption. To absorb the harmful gas produced by sulfur dioxide, methanol and methyl formate sodium dithionite in the waste gas, and the formaldehyde liquid that absorbs sulfur dioxide, methanol and methyl formate can be returned to the production process of sodium dithionite for use as raw materials; (2) cold lye Absorption: In the packed tower, use a 10% sodium hydroxide solution with a temperature of 0°C to countercurrently wash the waste gas produced by sodium dithionite to absorb sulfur dioxide and carbon dioxide in the waste gas; (3) Oxidation absorption: In the oxidation absorption tower, In the packed tower, use a 5% hydrogen peroxide solution at a ...

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PUM

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Abstract

The invention relates to a treatment method for waste gas produced in the preparation process of sodium hydrosulfite. The invention is characterized in that the method comprises the following steps in sequence: (1) absorbing the waste gas by methanol with the temperature being -20-15 DEG C, so as to absorb sulfur dioxide, methanol and methyl formate in the waste gas; (2) absorbing the waste gas by sodium hydroxide solution with the concentration being 5-20% and the temperature being -5-10 DEG C, so as to absorb sulfur dioxide and carbon dioxide in the waste gas; and (3) absorbing the waste gas by oxidizer with the temperature being 0-10 DEG C, so as to eliminate the ethanethiol in the waste gas. The invention has the advantages that the consumption of the sulfur dioxide and the methanol can be reduced in the preparation process of the sodium hydrosulfite; the oxidizer is used for oxidizing the ethanethiol in the waste gas, so as to eliminate the peculiar smell in the waste gas.

Description

technical field [0001] The invention designs waste gas treatment technology, in particular a treatment method for waste gas produced in the preparation process of sodium dithionite. Background technique [0002] Sodium dithionite has a wide range of uses. In the printing and dyeing industry, it can be used as a reducing agent for vat dyes, it can be used for reduction cleaning for disperse dyes, it can be used for stripping of reactive dyes, bleaching of silk and wool, and it can also be used in medicine, mineral processing, Synthesis of thiourea and its sulfides, etc. The molecular formula of sodium dithionite is: Na2S2O4. Formic acid is mixed with NaOH solution dissolved in methanol and water mixed solvent, and then SO2 gas is introduced to obtain sodium dithionite. The chemical reaction formula is: HCOONa+2SO2+NaOH==Na2S2O4+CO2 +H2O. The main components of waste gas produced during the production of sodium dithionite are nitrogen (nitrogen is used as a protective gas du...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D53/14B01D53/78B01D53/48C01B17/64
Inventor 张宝健王国清张心遵邹广柱
Owner 烟台金海化工有限公司
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