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Trimethylamine malodorous gas treatment method

A technology of malodorous gas and treatment method, which is applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of up-to-standard discharge of tail gas treatment, and achieve the effects of strong adaptability, high treatment efficiency, and wide application range of gas sources.

Pending Publication Date: 2021-04-02
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. For the characteristics of trimethylamine-containing multi-component malodorous gas, in order to overcome the problem that the traditional one or two treatment methods cannot make tail gas treatment reach the standard discharge, the present invention proposes a trimethylamine malodorous gas treatment method, comprising the following steps: The first step: the malodorous gas containing trimethylamine, methanol, ethyl chloride and benzyl chloride produced in the production process of tetramethylammonium hydroxide is collected under the action of fan suction; the second step: the malodorous gas is combined with Cooling medium heat exchange; the third step: the cooled gas first enters the pickling tower and absorbs and captures the acid liquid sprayed from top to bottom in the pickling tower; the fourth step: pickling from the top of the pickling tower The final gas enters the water washing tower, and the aqueous solution containing the plant extract is used to further absorb part of the soluble gas components and the entrained acid; the fifth step: the exhaust gas from the top of the water washing tower enters the absorption oxidation tower, and most of the remaining non-water-soluble Components and trimethylamine are absorbed and oxidized to CO 2 and H 2 O; Step 6: After the exhaust gas from the absorption and oxidation tower is completely removed from the exhaust gas by the adsorption tower, it is discharged to the chimney under the action of the fan

Method used

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  • Trimethylamine malodorous gas treatment method

Examples

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Effect test

Embodiment 1

[0029] A company that produces tetramethylammonium hydroxide collected trimethylamine-containing tail gas from synthesis kettles and stills. The main components are benzyl chloride, methanol, ethyl chloride, and trimethylamine. The incoming cooling medium is heat-exchanged to 0°C and enters the pickling tower, using 0.1mol / L HCl aqueous solution to wash and absorb the gas under the action of the acid circulation pump, and the absorbed gas enters the water washing tower with a concentration of 1% by mass The plant extract aqueous solution further washes and absorbs the gas, and the gas from the water washing tower is further introduced into the absorption oxidation tower, and the H 2 o 2 : Fe 2+ The oxidizing aqueous solution with a molar ratio of 4 and a pH value of 3 is in countercurrent contact with the bottom-up gas under the action of the solution pump, and the malodorous gas components are absorbed and oxidized, and the tail gas from the absorption oxidation tower is int...

Embodiment 2

[0031] A company that produces parylene collected trimethylamine-containing tail gas from synthesis kettles, ring closure kettles, distillation kettles, etc. The main components are benzyl chloride and trimethylamine. Heat to 3°C, enter the pickling tower, use 0.3mol / L H 2 SO 4The aqueous solution washes and absorbs the gas under the action of the acid circulation pump, and the absorbed gas enters the water washing tower, and the gas is further washed and absorbed by the plant extract aqueous solution with a concentration of 0.5% by mass, and the gas exiting the water washing tower is further introduced into the absorption oxidation tower , using H 2 o 2 : Fe 2+ The oxidizing aqueous solution with a molar ratio of 5 and a pH value of 4 is in countercurrent contact with the bottom-up gas under the action of the solution pump, and the malodorous gas components are absorbed and oxidized, and the tail gas from the absorption oxidation tower is introduced into the adsorption tow...

Embodiment 3

[0033] In a certain enterprise, the tail gas containing trimethylamine collected from the workshop, the main components are trimethylamine, methanol, propane, under the action of the fan, it exchanges heat with the cooling medium from the ice machine to 5°C, enters the pickling tower, and uses 0.4mol / L HNO 3 The aqueous solution washes and absorbs the gas under the action of the acid circulation pump, and the absorbed gas enters the water washing tower, and the gas is further washed and absorbed by the plant extract aqueous solution with a mass percent concentration of 4%, and the gas exiting the water washing tower is further introduced into the absorption oxidation tower , using H 2 o 2 : Fe 2+ The oxidizing aqueous solution with a molar ratio of 6 and a pH value of 5 is in countercurrent contact with the bottom-up gas under the action of the solution pump, and the malodorous gas components are absorbed and oxidized, and the tail gas from the absorption oxidation tower is ...

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Abstract

The invention discloses a trimethylamine malodorous gas treatment method, which is used for removing malodorous components in multi-component malodorous gas containing trimethylamine and other malodorous components to be below the emission standard by adopting a combined treatment method of acid pickling, water washing, absorption oxidation and adsorption, and belongs to the technical field of environmental protection. Waste gas containing trimethylamine is cooled under the action of a fan and then fed into an acid pickling tower, most trimethylamine and water-soluble solute are removed, gas discharged from an acid pickling tower enters a water washing tower containing plant extract, residual acid is removed, water-soluble malodorous components are further removed, gas discharged from a water washing tower enters high-efficiency absorption carbon oxide, and under the action of a Fenton reagent, the malodorous components are oxidized into CO2 and H2O, and tail gas discharged from an absorption oxidation tower is adsorbed by an adsorbent and then is fed into a chimney by a fan to be discharged. Compared with one or two existing treatment methods, the method has the advantages of widegas source adaptability, strong concentration adaptability, good malodorous component removal effect and the like, and is especially suitable for treatment of trimethylamine-containing multi-component malodorous gas.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and is used for the terminal treatment of production waste gas containing trimethylamine and other malodorous components, and relates to a treatment method for trimethylamine malodorous gas. Background technique [0002] During the production process of tetramethylammonium hydroxide and parylene, malodorous gas with trimethylamine as the main malodorous component will usually be produced. Trimethylamine is an odorous gas component that is difficult to handle, with a boiling point of 2.87°C, extremely volatile, soluble in water, ethanol, etc., flammable and toxic. Due to the low boiling point of trimethylamine, a large amount of volatilization during use, low olfactory threshold, and severe stench, it brings great troubles to the workshop personnel and the surrounding residents. The generated trimethylamine-containing waste gas also contains other components suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18B01D53/02
CPCB01D53/1487B01D53/18B01D53/02B01D2253/102B01D2257/40
Inventor 于品华李海涛汪东孔凡敏
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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