Resourceful treatment method and system for H acid production tail gas

A treatment method and technology of a treatment system are applied in the field of H acid synthesis, which can solve the problems of increasing the production cost of H acid and low economic value, and achieve the effects of improving secondary value, high treatment efficiency, and reducing waste gas treatment costs.

Active Publication Date: 2016-05-04
ZHEJIANG QICAI ECO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only researched on denitrification tail gas, and the obtained nitric acid can be reused, but the economic value is not high
At the same time, another set of equipment must be designed to handle sulfur dioxide tail gas, which increases the cost of H acid production

Method used

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  • Resourceful treatment method and system for H acid production tail gas
  • Resourceful treatment method and system for H acid production tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The denitrification tail gas produced in the H acid production process has a temperature of 80°C and a volume concentration of nitrogen oxides in the tail gas of 10%.

[0067] 1) After cooling the above-mentioned denitrification tail gas to 25°C, absorb it with 98% concentrated sulfuric acid to obtain absorption liquid I and tail gas I. The absorption liquid I was dark yellow, and the mass concentration of nitrosyl sulfuric acid was 28%, and the mass concentration of nitric acid was 7%.

[0068] 2) The acid analysis tail gas (containing SO 2 exhaust gas) into the absorption liquid I obtained in step (1) to obtain absorption liquid II and tail gas II. During the control process, the temperature is 50-55° C., and the absorption liquid II is monitored online. When the content of nitrosyl sulfuric acid is 42% and the content of nitric acid is 0.13%, the reaction is terminated. During the reaction process, the color of the absorption solution gradually turns yellow, and fi...

Embodiment 2

[0071] H acid denitrification process, the nitrogen oxide gas generated during the denitrification process, the tail gas is brownish red, and the measured gas volume concentration is about 13%.

[0072] (1) Pass the denitration tail gas into 98% concentrated sulfuric acid for absorption, and the absorption temperature is 25°C. Absorption liquid I and tail gas I are obtained. It is measured that the content of nitrosyl sulfuric acid in the absorption liquid I is about 33%, the concentration of nitric acid is about 9.3%, and the color of the tail gas I changes from brownish red to red.

[0073] (2) Use the absorption solution I obtained in step (1) to absorb acid analysis tail gas, and keep the temperature of the absorption process at 50-55° C. to obtain absorption solution II and tail gas II. It is measured that in the absorption liquid II, the content of nitrosyl sulfuric acid is 40.8%, and the content of nitric acid is 0.007%. Reaching the industrial quality standard, the a...

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Abstract

The invention relates to a resourceful treatment method and system for H acid production tail gas. The method comprises the steps that a sulfuric acid solution is used for absorbing denitration exhaust gas, the obtained absorption liquid is used for absorbing acidification exhaust gas, a nitrosyl sulfuric acid product is obtained, the excessive amount of NOx or SO2 is absorbed through alkali, and finally sodium nitrite or sodium sulfite is recycled. According to the method, the NOx or SO2 is recycled in the H acid production process, the exhaust gas is purified, and meanwhile the nitrosyl sulfuric acid product with the high added value is obtained. According to the treatment system, H acid production exhaust gas is treated, the nitrosyl sulfuric acid is obtained, and the product can be used as a diazotization reagent commonly used in the dye synthesis process for sale.

Description

technical field [0001] The invention relates to the fields of H-acid synthesis and waste gas treatment, in particular to a method and system for recycling tail gas from H-acid production, and belongs to the technical category of clean production and environmental protection applications. Background technique [0002] H acid is an important chemical intermediate, mainly used in the production of reactive, acidic and direct dyes. For example, reactive black KN-B, reactive brilliant red K-2BP, acid magenta 6B, acid scarlet G, acid black 10B, direct black and more than 90 kinds of products. [0003] At present, the mainstream process of domestic H acid: using refined naphthalene as raw material, through sulfonation-nitration-neutralization-reduction-T acid isolation-alkali fusion-H acid acid analysis, to obtain H-acid monosodium salt. [0004] The H acid denitrification process will produce a large amount of nitrogen oxide gas, and the H acid acid analysis process will generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/75B01D53/56B01D53/50C01B21/094
CPCB01D53/507B01D53/56B01D53/75B01D53/78B01D2251/504B01D2251/506B01D2258/02C01B21/094
Inventor 谭应龙徐雷金文庆毛兵王培城张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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