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Method for treating wastewater in production of sebacic acid

A technology for the production of wastewater and sebacic acid, which is applied in natural water treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., and can solve problems such as no fully mature economic and industrial solutions

Inactive Publication Date: 2011-04-27
TIANJIN MOKELI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of efficient treatment and utilization of sebacic acid to produce wastewater, there is currently no fully mature and economical industrial solution

Method used

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  • Method for treating wastewater in production of sebacic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The COD content in sebacic acid production wastewater A is 9000-10000mg / l (main components: about 0.08% sebacic acid and its derivatives, 2500mg / l phenol and m-cresol, etc.), sodium sulfate content 8-10%, pH Value 2-3.

[0016] After 48 hours of static precipitation, the wastewater discharged from the production is filtered through a 0.2 micron filter, neutralized with sodium hydroxide in the neutralization tank to a pH of 8, and then subjected to membrane distillation after precipitation and filtration. The salt concentration in the water is 14%, which is concentrated to 30% by the second-stage membrane distillation. The feed liquid inlet temperature of the membrane distillation is 85° C., and the vacuum degree on the downstream side is 0.075Mpa. The second-stage membrane distillation concentrated drainage enters the crystallization tank to cool down and crystallize, then centrifuge and purify to obtain industrial grade sodium sulfate solid salt. The extracted steam i...

Embodiment 2

[0018] The COD content in the sebacic acid production wastewater B is 6000-8000mmg / l (the main components are sebacic acid and its derivatives, phenol, etc.), the sodium sulfate content is 11%, and the pH value is 1-2.

[0019] After 15 hours of static precipitation, the waste water from production is filtered by sand filter and 0.4 micron filter, neutralized with sodium carbonate in the neutralization tank to pH 10, then added flocculant for flocculation and precipitation, and the clear liquid is filtered by microfiltration membrane Carry out membrane distillation, the salt concentration in the concentrated water discharged from the first-stage membrane distillation is 20%, and the second-stage membrane distillation concentrates it to 31%, the feed liquid inlet temperature of membrane distillation is 90°C, and the vacuum degree of the downstream side is 0.082Mpa . The second-stage membrane distillation concentrated drainage enters the crystallization tank to cool down and cry...

Embodiment 3

[0021] The COD content in sebacic acid production wastewater C is 10,000-11,000 mg / l (the main components are alcohols, sebacic acid and its derivatives, phenol, etc.), the sodium sulfate content is 7%, and the pH value is 2-3.

[0022] After 24 hours of static precipitation, the wastewater discharged from production is filtered by primary filtration and 0.2 micron filter, neutralized with quicklime in the neutralization tank to a pH of 12, and then statically precipitated, and the clear liquid is filtered by primary filtration and microfiltration membrane respectively. Membrane distillation, waste water is concentrated to 29% by membrane distillation once, the feed liquid inlet temperature of membrane distillation is 95°C, and the vacuum degree on the downstream side is 0.088Mpa. Membrane distillation concentrated drainage enters the crystallization tank to cool down, crystallize, and then separate and purify to obtain industrial grade sodium sulfate solid salt. The extracted...

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Abstract

The invention discloses a method for treating wastewater in the production of high-salt sebacic acid by membrane distillation under reduced pressure, which comprises the following steps of: pretreating the wastewater such as performing static precipitation and flocculation precipitation, filtering, regulating pH value and the like, adding into a multistage membrane distillation system to highly concentrate the wastewater in the membrane distillation system so as to obtain desalted water, cooling concentrated solution, crystallizing in a crystallizer, and separating to obtain solid salt. The process is simple and the method is high-efficiency and economical.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for treating and reusing sebacic acid production wastewater. Background technique [0002] The wastewater produced during the production of sebacic acid has high salinity (Na 2 SO 4 Content 5%~15%), high organic salt content (COD about 5000~15000mg / l) and high acidity (pH value 1-3). In terms of efficient treatment and utilization of sebacic acid to produce wastewater, there is currently no fully mature and economical industrial solution. Membrane distillation is a new type of desalination technology. One of its important characteristics is that it still has high permeable flux and good corrosion resistance and pollution resistance under high salinity. Membrane distillation (MD) is a membrane process that combines the distillation process. In the membrane distillation desalination process, the heated brine flows through one side of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/08C02F103/36
Inventor 王宏涛王丽张鹏硕
Owner TIANJIN MOKELI TECH
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