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Method for treating wastewater of rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfonamide

A technology of benzothiazole sulfenamide and rubber vulcanization, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. operation and other problems to achieve the effect of solving the problem of high-salt wastewater treatment

Inactive Publication Date: 2012-05-02
KEMAI CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Physical and chemical methods are simple and easy to operate, but the treatment cost is high; biochemical methods are low in treatment cost, but the process is complicated and the conditions are harsh and difficult to operate

Method used

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  • Method for treating wastewater of rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfonamide
  • Method for treating wastewater of rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfonamide

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Embodiment Construction

[0011] In the production process, the raw material M, cyclohexylamine, and sodium hypochlorite are mixed according to the ratio (process water 3.5-4.0m 3 , M1.2t, about 1kg of defoamer) put into the reactor for synthesis and oxidation reaction in turn, when the process reaches the synthesis of CZ slurry, CZ mother liquor (COD Cr About 1500mg / L), the mother liquor is the wastewater produced by the rubber vulcanization accelerator CZ. After filtering, the CZ mother liquor is separated from the material, the mother liquor settles for a period of time, pump out about 1 / 3 (30%-40%) of the mother liquor at the bottom, and send it to the CZ synthesis reactor to replace the process water for beating, and the remaining mother liquor is vacuum The temperature is -0.6~-0.8MPa, and the temperature is 70~80°C under reduced pressure distillation to recover cyclohexylamine, filter the mother liquor after distillation, introduce the filtrate into a multi-effect evaporator, concentrate to obta...

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Abstract

The invention belongs to a method for treating wastewater of a rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfonamide (CZ). The method comprises: returning 30%-40% of generated wastewater into a CZ synthesis reaction vessel for indiscriminate application, subjecting the rest part to vacuum distillation, recovering cyclohexylamine; precipitating organic components dissolved in cyclohexylamine, filtering the recovered mother liquid, and putting the precipitated organic matter into the synthesis reaction vessel for continuous reaction, and leading the filtrate to multiple-effect evaporation so as to obtain a sodium chloride saturated solution, conducting concentration so as to obtain a supersaturated solution of sodium chloride, and carrying out centrifugation, thus obtaining sodium chloride; returning part of the evaporated water to the device for reuse, and leaving the left part to biochemical treatment. In order to make the raw material M completely reacted during production, excess cyclohexylamine is added, so that a great amount of cyclohexylamine is contained in the wastewater. By adopting a mother liquid indiscriminate application technology, the mother liquid can be recycled, the primary utilization rate of cyclohexylamine can be enhanced, simultaneously the mother liquid treatment cost can be reduced, and the CZ yield can be improved. After mother liquid indiscriminate application, the CZ product has no abnormal change in appearance, and no obvious change in melting point as well as ash content.

Description

technical field [0001] The invention belongs to a method for treating waste water of rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfenamide, and belongs to the field of fine chemicals. Background technique [0002] Rubber vulcanization accelerator CBS (CZ), the chemical name is N-cyclohexyl-2-benzothiazole sulfenamide, is one of the important varieties of sulfenamide vulcanization accelerators, and has both scorching resistance and fast vulcanization speed, etc. advantage. However, a large amount of high-salt wastewater that is difficult to treat is produced in its production, which has slowed down the research progress over the years. Although the wastewater in the additive industry has been treated, the waste liquid is still discharged directly, which has caused a bad impact on our living environment. According to the status quo of wastewater treatment of rubber additives, physical and chemical methods and biochemical treatment methods are mainly used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01D3/04C07C211/35C07C209/86
Inventor 徐坤王占柱
Owner KEMAI CHEM
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