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Method for processing waste gas generated in isophthalonitrile production process

A technology for isophthalonitrile and waste gas, which is applied in the direction of separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of difficult preparation of thiamine, high processing costs, and complicated processes, so as to prevent secondary pollution, The effect of thorough treatment and simple process

Active Publication Date: 2009-07-29
SHANGHAI TAIHE INT TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The defects of the above-mentioned treatment method are very obvious: complicated process, high energy consumption, high treatment cost, and poor efficiency, especially when blowing off ammonia, a part of hydrogen cyanide is also blown out, which brings a lot to the subsequent preparation of thiamine. Difficulty

Method used

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  • Method for processing waste gas generated in isophthalonitrile production process
  • Method for processing waste gas generated in isophthalonitrile production process
  • Method for processing waste gas generated in isophthalonitrile production process

Examples

Experimental program
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Effect test

Embodiment 1

[0020] like figure 1 Shown, a kind of method for processing isophthalonitrile production waste gas, the waste gas flow rate that comes from the isophthalonitrile production line is 1.5m 3 / h, firstly enter the preprocessor to remove impurities, and then enter the heat exchanger. In the heat exchanger, the exhaust gas and the exhaust gas after combustion conduct heat exchange without contact, so as to make full use of thermal energy and reduce energy consumption. Then enter the catalytic combustion furnace for low-temperature catalytic combustion (200 ~ 250 ℃), place 200g catalyst in the catalytic combustion furnace, hydrogen cyanide (HCN) is selectively oxidized by the catalyst into non-toxic nitrogen, carbon dioxide, water, and ammonia gas in At this temperature, it does not substantially participate in the reaction, but is retained. The exhaust gas after decyanation enters the heat exchanger, preheats the exhaust gas to be treated, is cooled, and then enters the water cool...

Embodiment 2

[0024] see figure 1 As shown, the second batch of isophthalonitrile production waste gas is treated, and the specific process is the same as that in Example 1, and the specific data are shown in Table 2 below:

[0025] The data table of table 2 embodiment 2 processing isophthalonitrile production waste gas

[0026]

Embodiment 3

[0028] see figure 1 As shown, the third batch of isophthalonitrile production waste gas is treated, and the specific process is the same as that in Example 1, and the specific data are shown in Table 2 below:

[0029] The data table of table 3 embodiment 3 processing isophthalonitrile production waste gas

[0030]

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Abstract

The invention relates to a method for treating isophthalonitrile production waste gas, which comprises the following steps that: (1) the waste gas from an isophthalonitrile production line enters a pre-treating device first to be subjected to impurity removal; (2) the waste gas enters a heat exchanger; (3) the waste gas enters a catalytic combustion furnace to be subjected to low-temperature catalysis and combustion, and hydrogen cyanide is selectively oxidized by a catalyst into nontoxic nitrogen, carbon dioxide, water and ammonia gas is reserved; (4) the waste gas after decyanation enters the heat exchanger, the waste gas to be treated is preheated, but the heat exchanger is cooled; and (5) the preheated waste gas enters a water cooler to be cooled to normal temperature, the cooled ammonia-containing waste gas after decyanation is introduced into an ammonia absorption tower, and the ammonia is absorbed by sulfuric acid solution sprayed from the top and generates ammonium sulfate to be reclaimed so as to finish the treatment of the isophthalonitrile production waste gas. Compared with the prior art, the method for treating the isophthalonitrile production waste gas has the advantages of simple and reasonable process, low equipment investment and treating cost and low energy consumption, can thoroughly treat the hydrogen cyanide and reclaim the ammonia, and eliminate secondary pollution.

Description

technical field [0001] The invention relates to tail gas treatment, in particular to a method for treating waste gas produced by isophthalonitrile. Background technique [0002] Isophthalonitrile (abbreviated IPN), molecular formula CN-C 6 H 4 -CN is an important chemical intermediate, which can be used to synthesize pesticides, plastics and other products. Industrially, isophthalonitrile is usually prepared by ammoxidizing m-xylene under the action of a catalyst. However, large and high concentrations of hydrogen cyanide (HCN) and ammonia (NH) are emitted during production. 3 ). Among them, ammonia is the residual tail gas that cannot be completely reacted in the production, and hydrogen cyanide is a by-product produced in the reaction. [0003] At present, the method of processing the cyanide and ammonia-containing tail gas in production is as follows: absorbing the production tail gas with water, transferring the cyanide and ammonia in the tail gas to the water, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/54
Inventor 谢思勉郑天亮沈志松田晓宏
Owner SHANGHAI TAIHE INT TRADE CO LTD
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