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Recovery and utilization method of highly toxic medium hydrothion waste gas generated in polyphenylene sulfide production

A polyphenylene sulfide and exhaust gas recovery technology, which is applied in the field of polymer material synthesis, can solve the problems of hydrogen sulfide toxicity and other problems

Inactive Publication Date: 2012-09-19
SICHUAN DEYANG ENG PLASTIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is because in the technological process of synthesizing polyphenylene sulfide, at first sodium sulfide containing a large amount of crystal water is dehydrated, and because sodium sulfide is in the dehydration technological process, although adding alkali metal strong alkali to sodium sulfide is processed, However, sodium sulfide will be hydrolyzed in the presence of water, and a large amount of hydrogen sulfide will be released. The extreme toxicity of hydrogen sulfide forces it to be absorbed and treated.

Method used

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  • Recovery and utilization method of highly toxic medium hydrothion waste gas generated in polyphenylene sulfide production
  • Recovery and utilization method of highly toxic medium hydrothion waste gas generated in polyphenylene sulfide production

Examples

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Effect test

Embodiment 1

[0018] will contain H 2 S passes into the 500-liter ammonia water absorption tank to react, and the exhaust gas is input from the lower end, adopting the bubbling method, H 2 S to (NH 4 ) 2 S, under the protection of nitrogen, so as to obtain a dilute ammonium sulfide solution, and then input the heat released by the synthesis of polyphenylene sulfide resin (water vapor at 100-150°C) into the ammonium sulfide solution tank, which is With stirring and jacket, it releases heat by controlling the synthesis of polyphenylene sulfide resin input, so that the temperature of the dilute ammonium sulfide solution is gradually raised to 100 ° C, and a certain amount of water vapor is evaporated, and the water vapor is cooled and waited. Use, while the ammonium sulfide solution is concentrated into a solution with a concentration of 16%wt, then the ammonium sulfide solution is distilled under reduced pressure, and the water that is distilled is reclaimed to obtain a solution containing ...

Embodiment 2

[0020] will contain H 2 S passes into the 500-liter ammonia water absorption tank to react, and the exhaust gas is input from the lower end, adopting the bubbling method, H 2 S to (NH 4 ) 2 S, under the protection of nitrogen, so as to obtain a dilute ammonium sulfide solution, and then input the heat released by the synthesis of polyphenylene sulfide resin (water vapor at 100-150°C) into the ammonium sulfide solution tank, which is With stirring and jacket, it releases heat by controlling the synthesis of polyphenylene sulfide resin input, so that the temperature of the dilute ammonium sulfide solution is gradually raised to 100 ° C, and a certain amount of water vapor is evaporated, and the water vapor is cooled and waited. At the same time, the ammonium sulfide solution is concentrated into a solution with a concentration of 20%wt, and then the ammonium sulfide solution is distilled under reduced pressure to reclaim the distilled water to obtain a solution containing 80%w...

Embodiment 3

[0022] will contain H 2 S passes into the 500-liter ammonia water absorption tank to react, and the exhaust gas is input from the lower end, adopting the bubbling method, H 2 S to (NH 4 ) 2 S, under the protection of nitrogen, so as to obtain a dilute ammonium sulfide solution, and then input the heat released by the synthesis of polyphenylene sulfide resin (water vapor at 100-150°C) into the ammonium sulfide solution tank, which is With stirring and jacket, it releases heat by controlling the synthesis of polyphenylene sulfide resin input, so that the temperature of the dilute ammonium sulfide solution is gradually raised to 100 ° C, and a certain amount of water vapor is evaporated, and the water vapor is cooled and waited. Use, while the ammonium sulfide solution is concentrated into a solution with a concentration of 18%wt, then the ammonium sulfide solution is distilled under reduced pressure, and the water that is distilled is reclaimed to obtain a solution containing ...

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Abstract

The invention discloses a recovery and utilization method of highly toxic medium hydrothion waste gas generated in polyphenylene sulfide production. The method includes: adopting waterish sodium sulphide and p-dichlorobenzene as raw materials to be subjected to process steps such as sodium sulphide dehydration and polycondensation to produce polyphenylene sulfide monomers, leading waste gas rich in hydrogen sulfide to be reacted with ammonia water in an alkali liquor absorption tank, leading the reaction product ammonium sulfide to be concentrated to serve as component conditioning agents for polyphenylene sulfide production to be conveyed to a reaction kettle so as to effectively regulate polymerized polyphenylene sulfide resin molecules, wherein the molecular weight distribution coefficient after regulation can keep between 1.91-1.93. After being subjected to ammonium sulfide processing and regulating, content of various metal chloride ions and non-metal chloride ions in the polyphenylene sulfide resin is small, and the total amount of metal ions is 200-300 ppm. By adopting the method, highly toxic medium hydrothion waste gas is treated and good environment protection effect is achieved; and a virtuous closed circle is formed due to the fact that the orginal water gas is converted into production raw materials capable of being reused.

Description

Technical field [0001] The invention is the field of high molecular materials synthesis. Background technique [0002] During the process of using alkaline metal sulfide and the production of polybenzene sulfe ether (PPS) for dichloropine as raw materials, it will produce exhaust gas rich in hydrogen sulfide and toxic medium, which is not good for environmental protection.The existing technology uses a physical absorption method, and there are secondary pollution. [0003] In the Chinese patent application number CN03117750.6 Introduction to the absorption and treatment process of hydrogen sulfide gases in the synthesis process of polystyrene sulfation ether resin, which is puzzling, the absorption of hydrogen sulfide is too general.Hydrogen, the sodium sulfide generated by the reaction is synthesized with the polyzide sulfe, but it is not difficult to find that the invention is very mediocre. [0004] In view of the above shortcomings of the existing technology, the purpose of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/00C08G75/02C08G75/0213C08G75/0254C08G75/0295
Inventor 刘文良蔡兴明徐伟
Owner SICHUAN DEYANG ENG PLASTIC DEV
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