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Method for preparing sodium hydrosulphite by utilization of tail gas from acyl chloride production

A technology of sodium sulfite and sodium bisulfite, which is applied in the preparation, separation method, chemical instrument and method of alkali metal sulfite, can solve the problem that calcium sulfite is not very useful, the absorption rate of sulfur dioxide is not high, and the absorption efficiency of sulfur dioxide is not high. Advanced problems, to achieve the effect of stable product quality

Active Publication Date: 2012-06-27
YANTAI TAYHO ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former method has the disadvantages of low sulfur dioxide absorption efficiency and unstable product quality; while lime absorption is a relatively backward method, its sulfur dioxide absorption rate is not high, and the generated calcium sulfite is not very useful.

Method used

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  • Method for preparing sodium hydrosulphite by utilization of tail gas from acyl chloride production
  • Method for preparing sodium hydrosulphite by utilization of tail gas from acyl chloride production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) acid chloride production tail gas is absorbed through falling film water, removes HCl gas wherein, and generation mass fraction is the concentrated hydrochloric acid of 30%;

[0021] (2) remove a small amount of HCl gas mixed with sulfur dioxide with saturated sodium bisulfite solution;

[0022] (3) The acid chloride production tail gas that step (2) has been processed is passed into continuous feeding and continuous discharge and concentration is equipped with in the absorption kettle of the sodium carbonate solution of 200g / L, under normal pressure, 40 ℃ of conditions, carry out three The stage continuously absorbs sulfur dioxide, generates and releases a feed liquid containing sodium bisulfite, and controls the pH of the discharged feed liquid to be 5.9;

[0023] (4) The feed liquid released in step (3) is neutralized with a 30% NaOH solution until the pH value is 10.0 to obtain a neutralized liquid.

[0024] Through the above steps, the absorption rate of sulfu...

Embodiment 2

[0026] (1) acid chloride production tail gas is absorbed through falling film water, removes HCl gas wherein, and generation mass fraction is the concentrated hydrochloric acid of 32%;

[0027] (2) remove a small amount of HCl gas mixed with sulfur dioxide with saturated sodium bisulfite solution;

[0028] (3) The acid chloride production tail gas that step (2) has been processed is passed into the absorption kettle of the sodium carbonate solution of 250g / L with continuous feeding and continuous discharging and is equipped with concentration, under normal pressure, 110 ℃ of conditions, carry out three The stage continuously absorbs sulfur dioxide, generates and releases a feed liquid containing sodium bisulfite, and controls the pH of the discharged feed liquid to be 3.9;

[0029] (4) the feed liquid that step (3) emits is the Na of 30% with massfraction 2 CO 3 The solution is neutralized until the pH value is 8.0 to obtain a neutralized solution.

[0030] Through the abov...

Embodiment 3

[0032] (1) acid chloride production tail gas is absorbed through falling film water, removes HCl gas wherein, and generation mass fraction is the concentrated hydrochloric acid of 28%;

[0033] (2) remove a small amount of HCl gas mixed with sulfur dioxide with saturated sodium bisulfite solution;

[0034] (3) The acid chloride production tail gas that step (2) has been processed is passed into continuous feed and continuous discharge and concentration is equipped with in the absorption kettle of the sodium carbonate solution of 225g / L, under normal pressure, 70 ℃ of conditions, carry out three The stage continuously absorbs sulfur dioxide, generates and releases a feed liquid containing sodium bisulfite, and controls the pH of the discharged feed liquid to be 4.9;

[0035] (4) the feed liquid that step (3) emits is 35% Na with massfraction 2 CO 3 The solution is neutralized until the pH value is 9.0 to obtain a neutralized solution.

[0036] Through the above steps, the ab...

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Abstract

The invention relates to a method for preparing sodium hydrosulphite by the utilization of tail gas from acyl chloride production. The method has advantages of high absorptivity of sulfur dioxide, high absorption efficiency of sulfur dioxide, good sodium hydrosulphite product quality and product quality stability. The method comprises the following steps of: (1) absorbing the tail gas from acyl chloride production through water and removing HCl gas; (2) removing a few HCl gas from sulfur dioxide by the use of a saturated sodium bisulfite solution; (3) allowing the acyl chloride production tail gas processed from the step (2) to enter into a continuous feeding and continuous discharging absorption kettle filled with a sodium carbonate solution, carrying out three-stage continuous absorption of sulfur dioxide at normal pressure at 40-110 DEG C to generate a sodium bisulfite containing feed solution, discharging the feed solution, and controlling pH of the discharged feed solution within 3.9-5.9; and (4) neutralizing the discharged feed solution from the step (3) by the use of alkali until pH is within 8.0-10.0 to obtain a neutralizer, wherein the alkali is a NaOH solution or a Na2CO3 solution.

Description

technical field [0001] The invention relates to a method for preparing sodium sulfite, in particular to a method for preparing sodium sulfite by utilizing acid chloride production tail gas. Background technique [0002] The treatment of hydrogen chloride and sulfur dioxide in the tail gas during the production of acid chloride by the thionyl chloride method has always been a difficult problem in this industry. With the continuous expansion and rapid development of the production scale of the acid chloride industry in my country, as the main component of the tail gas of acid chloride production, the treatment of hydrogen chloride is relatively easy, while the treatment of sulfur dioxide is more difficult. At present, the treatment of hydrogen chloride in the tail gas of acid chloride production mainly adopts the water absorption method, and the treatment methods of sulfur dioxide mainly include two methods: using lye for intermittent absorption and lime for absorption. The u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/68C01D5/14
Inventor 马海兵包锡强董秋实黄蒙蒙
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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