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Process for treating acetone-containing and ammonia-containing tail gas produced in production process of triacetoneamine

A production process and technology of triacetone amine, which is applied to the process field containing acetone and ammonia tail gas, can solve problems such as poor applicability, waste, and single technology, and achieve the effects of reducing unit consumption, purifying emissions, and green production

Inactive Publication Date: 2018-09-18
HENGSHUI KAIYA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method has mild conditions and no secondary pollution, the technology is single and the applicability is poor, and it cannot realize the efficient treatment of high-concentration organic waste gas; in addition, this method directly destroys the high-concentration acetone and ammonia in the tail gas, and cannot recover the beneficial substances in the tail gas. components, resulting in a lot of waste

Method used

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  • Process for treating acetone-containing and ammonia-containing tail gas produced in production process of triacetoneamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the first step, the tail gas containing acetone and ammonia generated during the production of triacetone amine enters the -60 through the pump mechanism o C condenser;

[0029] In the second step, the cryogenically cooled tail gas passes through the air / gas heat exchanger to recover the cooling capacity, and the tail gas can reach 20 o C, non-methane total hydrocarbon concentration 2000 mg / m 3 ;

[0030] In the third step, water is sprayed from the tower and the temperature is controlled at 20 o The top of the packed tower of C enters and contacts with the exhaust gas countercurrently;

[0031] In the fourth step, the tail gas absorbed by water is dehydrated by cooling and drying in ice water, and the water content of the tail gas is less than 0.1%;

[0032] In the fifth step, the tail gas after dehydration is monitored online and the concentration of non-methane total hydrocarbons is 35 mg / m 3 .

Embodiment 2

[0034] In the first step, the tail gas containing acetone and ammonia produced in the production process of triacetone amine enters the -60 o C condenser;

[0035] In the second step, the cryogenically cooled tail gas passes through the air / gas heat exchanger to recover the cooling capacity, and the tail gas can reach 20 o C, non-methane total hydrocarbon concentration 5000mg / m 3 ;

[0036] In the third step, 5% acidic potassium permanganate solution is sprayed from the tower and the temperature is controlled at 60 o C enters from the top of the packed tower and contacts with the tail gas countercurrently;

[0037] In the fourth step, the tail gas absorbed by water is dehydrated by cooling and drying in ice water, and the water content of the tail gas is less than 0.1%;

[0038] In the fifth step, the tail gas after dehydration is monitored online and the concentration of non-methane total hydrocarbons is 50 mg / m 3 .

Embodiment 3

[0040] In the first step, the tail gas containing acetone and ammonia produced in the production process of triacetone amine enters the -60 o C condenser;

[0041] In the second step, the cryogenically cooled tail gas passes through the air / gas heat exchanger to recover the cooling capacity, and the tail gas can reach 20 o C, non-methane total hydrocarbon concentration 4000 mg / m 3 ;

[0042] In the third step, 3% hydrogen peroxide solution is sprayed to control the temperature in the tower at 40 o C enters from the top of the packed tower and contacts with the tail gas countercurrently;

[0043] In the fourth step, the tail gas absorbed by water is dehydrated by cooling and drying in ice water, and the water content of the tail gas is less than 0.1%;

[0044] In the fifth step, the tail gas after dehydration is monitored online and the concentration of non-methane total hydrocarbons is 43 mg / m 3 .

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Abstract

The invention belongs to the technical field of preparation of triacetoneamine which is a hindered amine light stabilizer intermediate and a pharmaceutical intermediate, and specifically relates to aprocess for treating acetone-containing and ammonia-containing tail gas produced in the production process of the triacetoneamine. According to a main technical scheme of the invention, the process comprises the following steps: allowing the acetone-containing and ammonia-containing tail gas to enter a condenser to achieve a copious cooling condition, recovering cold energy through a gas / gas heatexchanger, then allowing obtained tail gas to enter a chemical oxidation or absorption tower with a temperature controlled in a range of 20 to 60 DEG C, subjecting oxidized or absorbed tail gas to freeze-drying with ice water for dehydration treatment, subjecting dehydrated tail gas to online monitoring, and then carrying out discharging. The process provided by the invention purifies the acetone-containing and ammonia-containing tail gas by utilizing copious cooling, chemical oxidation (or water absorption) and ice-water freeze-drying, can realize recycling of effective components in the tailgas and up-to-standard discharge of the tail gas, and has the advantages of high purification efficiency, no secondary pollution, etc.

Description

technical field [0001] The invention belongs to the technical field of preparation of hindered amine light stabilizer intermediates and pharmaceutical intermediates triacetone amine, and specifically relates to a process for treating tail gas containing acetone and ammonia produced in the production process of triacetone amine. Background technique [0002] The chemical name of triacetonamine is 2,2,6,6-tetramethylpiperidone, which is an important hindered amine light stabilizer intermediate and pharmaceutical intermediate, especially in the field of hindered amine light stabilizer, triacetonamine It is the only parent nucleus of the hindered amine light stabilizer piperidine derivatives, and is an important raw material for the synthesis of tetramethylpiperidinol, tetramethylpiperidinamine and polymerization inhibitor 702. [0003] The tail gas produced during the production of triacetonamine contains acetone and ammonia as well as some by-products with lower boiling points...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/72B01D53/58B01D53/14B01D53/00B01D5/00
CPCB01D53/002B01D53/1487B01D53/1493B01D53/58B01D53/72B01D53/78B01D2251/10B01D2251/106B01D2251/108B01D2252/103Y02P70/10
Inventor 赵衡赵晓峰刘俊华王慧君马琳琳
Owner HENGSHUI KAIYA CHEM
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