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Absorbent and removal method for removing sulfur dioxide in chloroacetic acid tail gas

A sulfur dioxide and chlorine removal technology, which is applied to the absorbent for removing sulfur dioxide in chloroacetic acid tail gas, and in the field of removing sulfur dioxide in chloroacetic acid tail gas, can solve the problems of a large amount of washing or alkali washing waste liquid, environmental pollution, and large water consumption. , to achieve the effect of low operating cost, high desulfurization rate and reduced desulfurization cost

Active Publication Date: 2019-01-04
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment of chloroacetic acid tail gas by this method will produce a large amount of washing or alkali washing waste liquid, which will cause a certain degree of pollution to the environment.
Chinese patent application CN 102249189 A discloses "a method for recovering hydrochloric acid in the production of chloroacetic acid". The hydrogen chloride in the tail gas of chloroacetic acid is subjected to desulfurization tower, washed with water, and absorbed to obtain the first-class hydrochloric acid for industrial synthesis. The pressure is 0.1-0.4MPa, and the temperature of washing and absorbing hydrochloric acid is 300°C-500°C. This method consumes a lot of energy and water

Method used

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  • Absorbent and removal method for removing sulfur dioxide in chloroacetic acid tail gas
  • Absorbent and removal method for removing sulfur dioxide in chloroacetic acid tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment relates to a group of absorbents for removing sulfur dioxide in chloroacetic acid tail gas, and its composition is shown in the following table:

[0022]

[0023] Examples 1.1 to 1.10 are absorbents for removing sulfur dioxide in chloroacetic acid tail gas of the present invention, and examples 1.11 to 1.13 do not belong to absorbents of the present invention, and are used to compare SO with examples 1.1 to 1.10 2 Remove the effect. Wherein the proportioning of concentrated hydrochloric acid, ionic liquid and oxidizing agent in embodiment 1.11 is not within the scope of the present invention, the ionic liquid used in embodiment 1.12~1.13 does not belong to the ionic liquid of the present invention, is the absorbing SO commonly used in this technical field 2 ionic liquid.

Embodiment 2

[0025] This embodiment relates to the method for removing sulfur dioxide in the tail gas of chloroacetic acid. The absorbent in Example 1 is loaded into the desulfurization tower, and the by-product of chloroacetic acid containing HCl and SO 2 The exhaust gas is passed into the desulfurization tower for desulfurization treatment under normal pressure, and the HCl escaping from the top of the desulfurization tower is dehydrated by the scrubber to recover HCl gas. During the desulfurization process, the operating parameters such as the temperature in the desulfurization tower, the air velocity of the tail gas, as well as the desulfurization effect and HCl recovery content are shown in the table below. SO 2 The removal rate was determined by detecting SO in the tail gas at the inlet of the desulfurization tower and the outlet of the scrubber. 2 The content is calculated.

[0026]

[0027] As can be seen from the results in the table above, the absorbent for removing sulfur d...

Embodiment 3

[0029] This embodiment relates to the repeated use of the absorbent for removing sulfur dioxide in chloroacetic acid tail gas of the present invention. The specific operation is as follows: when the absorbent of the present invention has been running for a period of time in the desulfurization tower, stop feeding the chloroacetic acid tail gas, take the absorbent sample, and detect the sulfuric acid content in the water phase. When the sulfuric acid mass fraction reaches 60%, the absorbent is taken from It is released from the desulfurization tower, and the concentrated hydrochloric acid and oxidant in the water phase are separated by standing still, and the oil phase ionic liquid is retained, and then new concentrated hydrochloric acid and oxidant are added to the ionic liquid, and the absorbent formed is reloaded into the desulfurization tower and continues to be used for chlorine The treatment operation of acetic acid tail gas. Taking the absorbent of Example 1.3 as an exam...

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PUM

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Abstract

The invention relates to an absorbent for removing sulfur dioxide in chloroacetic acid tail gas. The absorbent is composed of concentrated hydrochloric acid, an ionic liquid and an oxidizing agent. According to the invention, chloroacetic acid tail gas containing HCl and SO2 is introduced into the absorbent of the invention. Then, SO2 is absorbed by the absorbent to be converted into SO4<2-> so as to be efficiently removed. Residual HCl overflows from the absorbent such that high-purity HCl can be recovered to be used as a chemical synthesis raw material. Therefore, efficient treatment and utilization of chloroacetic acid tail gas are realized. The removal method of the invention is simple and has advantages of low energy consumption and high removal efficiency.

Description

technical field [0001] The invention relates to a sulfur dioxide absorbent, in particular to an absorbent for removing sulfur dioxide in chloroacetic acid tail gas, and at the same time, the invention also relates to a method for using the absorbent to remove sulfur dioxide in chloroacetic acid tail gas. Background technique [0002] Chloroacetic acid is an important organic chemical intermediate, which is widely used in dyestuffs, medicines, pesticides, daily chemicals, surfactants and other industries. At present, most domestic chloroacetic acid enterprises use acetic acid chlorination with sulfur as a catalyst. method, the tail gas produced by this method after acetic acid absorption and segmental condensation contains hydrogen chloride, sulfur dioxide and trace amounts of sulfur chloride, acetyl chloride, chloroacetyl chloride, acetic acid, chlorine and other components, of which the content of hydrogen chloride is 91%-95%, SO 2 The content is 4.9%-8.9%, and the total am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50
CPCB01D53/507B01D53/78B01D2251/506B01D2259/124
Inventor 刘玉敏刘婷婷赵途张向京胡永琪赵风云
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY