Method for comprehensively utilizing chlorination tail gas in chlorination-process titanium dioxide powder production procedures

A production process, a technology for chlorinating tail gas, applied in chemical instruments and methods, chlorine/hydrogen chloride, preparation with chloride, etc., can solve the problems of waste of carbon resources, unreasonable utilization of combustion heat, and uneffective utilization, etc. Reduce emission pressure and production costs, improve resource utilization, and achieve the effect of effective utilization

Active Publication Date: 2016-10-26
YIBIN TIANYUAN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of the treatment methods of pickling, alkali washing, water washing, or alkali washing, the carbon monoxide contained in the exhaust gas after purification has not been effective

Method used

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  • Method for comprehensively utilizing chlorination tail gas in chlorination-process titanium dioxide powder production procedures

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] The chlorinated tail gas produced during the production of chlorination titanium dioxide is passed into the pickling tower to obtain by-product hydrochloric acid; the tail gas after the acid cleaning is passed into the caustic scrubbing tower, and the tail gas after the caustic cleaning enters the combustion furnace to burn and burn to generate hot smoke The air is mixed with air and cooled to about 250°C, and then enters the reboiler to heat the hydrochloric acid in the desorption tower, and finally evacuates; the by-product hydrochloric acid obtained from the pickling of the chlorinated tail gas is filtered through the by-product hydrochloric acid filter tank to obtain a concentration of about 25% The hydrochloric acid from the by-product hydrochloric acid enters the by-product hydrochloric acid storage tank. The hydrochloric acid in the by-product hydrochloric acid storage tank is pumped to the double-effect heat exchanger. After heat exchange, the te...

Example Embodiment

[0033] Example 2:

[0034] The chlorinated tail gas produced during the production of chlorination titanium dioxide is passed into the pickling tower to obtain by-product hydrochloric acid; the tail gas after the acid cleaning is passed into the caustic scrubbing tower, and the tail gas after the caustic cleaning enters the combustion furnace to burn and burn to generate hot smoke The air is mixed with air and cooled to about 225°C, and then it enters the reboiler to heat the hydrochloric acid in the desorption tower, and finally evacuates; the by-product hydrochloric acid obtained from the pickling of the chlorinated tail gas is filtered through the by-product hydrochloric acid filter tank to obtain a concentration of about 28% The hydrochloric acid from the by-product hydrochloric acid enters the by-product hydrochloric acid storage tank. The hydrochloric acid in the by-product hydrochloric acid storage tank is pumped to the double-effect heat exchanger. After heat exchange, the...

Example Embodiment

[0035] Example 3:

[0036] The chlorinated tail gas produced during the production of chlorination titanium dioxide is passed into the pickling tower to obtain by-product hydrochloric acid; the tail gas after the acid cleaning is passed into the caustic scrubbing tower, and the tail gas after the caustic cleaning enters the combustion furnace to burn and burn to generate hot smoke The gas is mixed with air and cooled to about 200℃, and then it enters the reboiler to heat the hydrochloric acid in the desorption tower, and finally evacuates; the by-product hydrochloric acid obtained from the pickling of the chlorinated tail gas is filtered through the by-product hydrochloric acid filter tank to obtain a concentration of about 30% The hydrochloric acid from the by-product hydrochloric acid enters the by-product hydrochloric acid storage tank. The hydrochloric acid in the by-product hydrochloric acid storage tank is pumped to the double-effect heat exchanger. After heat exchange, the ...

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Abstract

The invention relates to a method for treating chlorination tail gas in chlorination-process titanium dioxide powder production procedures. Carbon monoxide in the chlorination tail gas can be used as a heat source, and byproduct hydrochloric acid which is obtained after the chlorination tail gas is subjected to acid pickling can be desorbed to obtain high-purity hydrogen chloride by the aid of the method. The method includes carrying out acid pickling and alkali washing on the chlorination tail gas, then combusting the chlorination tail gas in a combustion furnace, feeding generated hot flue gas into a reboiler and ultimately venting the flue gas; filtering the byproduct hydrochloric acid obtained after the chlorination tail gas is subjected to acid picking, carrying out heat exchange on the byproduct hydrochloric acid, then feeding the byproduct hydrochloric acid into a desorption tower, continuously heating and evaporating the byproduct hydrochloric acid by the aid of a reboiler to obtain hydrogen chloride gas, exhausting the hydrogen chloride gas from the top of the desorption tower and draining evaporated diluted hydrochloric acid from the bottom of the desorption tower; carrying out heat exchange on the diluted hydrochloric acid by the aid of a double-effect heat exchanger and cooling the diluted hydrochloric acid until the temperature of the diluted hydrochloric acid reaches the normal temperature; condensing the hydrogen chloride gas to obtain high-purity hydrogen chloride gas. The method has the advantages that carbon resources can be effectively utilized; the recycled hydrochloric acid can be converted into the high-purity hydrogen chloride, and accordingly the resource utilization rate can be increased; the desorbed diluted hydrochloric acid is used as acid pickling absorption liquid, accordingly, the recycling rate of the byproduct hydrochloric acid can be increased, discharge pressures can be relieved, and the production cost can be lowered.

Description

technical field [0001] The invention relates to a method for treating tail gas, in particular to a method for treating chlorinated tail gas in the production process of chlorinated titanium dioxide. Background technique [0002] Titanium dioxide is a white inorganic pigment with the best opacity, best whiteness, brightness and non-toxic properties. It is recognized as the best white pigment in the world. It is widely used in coatings, plastics, papermaking, Printing ink, chemical fiber, rubber, cosmetics and other industries. [0003] The production of titanium dioxide by the chlorination method is mainly to mix the titanium-rich raw materials with petroleum coke, and then carry out chlorination reaction in the chlorination furnace to form a mixture containing titanium tetrachloride, and the mixture from the top of the chlorination furnace is separated by a cyclone dust collector slag, dust, to obtain crude titanium tetrachloride; make the VOCl contained in the crude titani...

Claims

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Application Information

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IPC IPC(8): C01B7/03C01B7/07
CPCC01B7/035C01B7/0706
Inventor 邓敏颜华唐义万立
Owner YIBIN TIANYUAN GRP CO LTD
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