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Method for treating meta ethylene chloride saponification waste water

A technology for vinylidene chloride and saponification wastewater, applied in the field of vinylidene chloride saponification wastewater treatment and recovery of vinylidene chloride and salt, can solve the problems of lack of simultaneous removal of chlorine, lack of, lack of removal of chloric acid radicals, etc., and achieve significant economic benefits , low processing cost, cheap and easy-to-obtain materials

Inactive Publication Date: 2009-07-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, the key problems in the technical method of recovering valuable components in vinylidene chloride saponification wastewater are: (1) lack of effective technical method for removing chlorate radicals; (2) lack of simultaneous removal of chlorate radicals and organic chlorine (3) Lack of engineering-applicable, economical and reasonable technology for recovering vinylidene chloride and salt in wastewater

Method used

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  • Method for treating meta ethylene chloride saponification waste water
  • Method for treating meta ethylene chloride saponification waste water
  • Method for treating meta ethylene chloride saponification waste water

Examples

Experimental program
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Embodiment 1

[0059] After the vinylidene chloride saponification wastewater is collected, it is introduced into the stripping unit, and steam is introduced to recover vinylidene chloride; the effluent from the stripping unit is introduced into the neutralization tank, and hydrochloric acid is added to adjust the pH value; the wastewater is introduced into the fluidized bed dechlorination reactor, and the As a reducing agent, two-stage or multi-stage dechlorination reactors can be used to increase the removal rate of chlorate and chlorinated alkanes; the waste water after dechlorination treatment is introduced into the coagulation reactor, and alkali is first added to neutralize to neutral to alkali After the coagulation reaction, the wastewater is introduced into the clarification tank, and the clarified wastewater is introduced into the subsequent process for electrolytic recovery of salt.

[0060] Saponification wastewater quality: vinylidene chloride 0.2%; sodium chlorate 552mg / l; sodium...

Embodiment 2

[0071] According to the step described in embodiment 1, concrete processing conditions are as follows:

[0072] Saponification wastewater quality: vinylidene chloride 4150mg / l; sodium chlorate 1200mg / l; sodium hypochlorite 1500mg / l; trichloroethane 100mg / l; dichloromethane 360mg / l; salt concentration 17%; iron ion concentration 330mg / l; Sulfate concentration 80mg / l.

[0073] Stripping operating conditions: 88°C.

[0074] Stripping and water neutralization conditions: pH5.0.

[0075] Reductant: cast iron powder, the dosage is 1.7kg per ton of waste water.

[0076] Reductive dechlorination operating conditions: temperature 55°C; pressure at atmospheric pressure, residence time 75min.

[0077] Neutralization and coagulation unit operating conditions: caustic neutralization, pH 10.2; 45°C.

[0078] Chemical precipitant: barium chloride, the dosage is 50g per ton of waste water.

[0079] Coagulant aid: polyacrylic acid, the dosage is 20g per ton of waste water.

[0080] Coagu...

Embodiment 3

[0083] According to the step described in embodiment 1, concrete processing conditions are as follows:

[0084] Saponification wastewater quality: vinylidene chloride 5000mg / l; sodium chlorate 650mg / l; sodium hypochlorite 1820mg / l; trichloroethane 121mg / l; dichloromethane 720mg / l; salt concentration 22%; iron ion concentration 500mg / l; Sulfate concentration 170mg / l.

[0085] Stripping operating conditions: 95°C.

[0086] Stripping and water neutralization conditions: pH3.2.

[0087] Reducing agent: metal iron powder, the dosage is 2.6kg per ton of waste water.

[0088] Reductive dechlorination operating conditions: the temperature is 72°C; the pressure is atmospheric pressure, and the residence time is 110min.

[0089] Neutralization and coagulation unit operating conditions: caustic neutralization, pH9.0; 67°C.

[0090] Chemical precipitant: barium chloride, the dosage is 360g per ton of waste water.

[0091] Coagulant aid: polyacrylic acid amide, the dosage is 8.0g per ...

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Abstract

The invention discloses a method for treating vinylidene chloride saponification wastewater, which is used for treating vinylidene chloride saponification wastewater and recovering vinylidene chloride and salt. When the value is acidic, it is input into the dechlorination reactor, and the reducing agent is added to carry out the reduction reaction to remove chlorate and chlorinated alkanes. After the reduction reaction is completed, the waste water is introduced into the coagulation reactor, and alkali is added to neutralize to neutral to alkaline , and then adding chemical precipitant and coagulant aid for coagulation reaction, the wastewater is introduced into the clarification tank, and the clarified wastewater enters the subsequent electrolytic salt recovery process. The method of the invention is used for treating vinylidene chloride saponification waste water under normal pressure, the materials used are cheap and easy to obtain, the treatment cost is low, and the treatment effect is good.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating vinylidene chloride saponification wastewater and recovering vinylidene chloride and salt. Background technique [0002] Vinylidene chloride (VDC) is an important chemical raw material with a wide range of uses. There are many production methods for vinylidene chloride, and the common production methods according to the raw material route are: vinyl chloride chlorination method, vinyl chloride hydrochlorination method, 1,2-dichloroethane chlorination method, ethane chlorination method. Several domestic production enterprises adopt the vinyl chloride chlorination method. [0003] In the process of producing vinylidene chloride by vinyl chloride chlorination, 1,1,2-trichloroethane is dehydrochlorinated in lye, and then generates vinylidene chloride. In this process, excessive sodium hydroxide is used as a reactant, which is called It is a saponification proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/58C02F1/66C02F1/70C02F1/52C02F1/461
Inventor 官宝红沈卓贤吴忠标曾爱斌赵伟荣刘越
Owner ZHEJIANG UNIV