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Epoxy ester wastewater recycling treatment method

A treatment method and epoxy ester technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Energy consumption, guaranteed treatment effect, convenient filler replacement and equipment maintenance effect

Active Publication Date: 2008-06-18
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] Epoxy ester production wastewater is acidic, and the main pollutant is formic acid. It is difficult to directly treat and meet the discharge standards and the treatment cost is high.

Method used

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  • Epoxy ester wastewater recycling treatment method
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Embodiment Construction

[0052] The present invention will be further described below in conjunction with drawings and embodiments.

[0053] The water quality of formic acid wastewater generally from the production of epoxidized soybean oil is shown in Table 1.

[0054] Table 1 Water quality of formic acid wastewater

[0055] Substance name

concentration

formic acid

2～20％

hydrogen peroxide

0.2～2.0％

Grease

100~5000mg / L

COD Cr

10000~300000mg / L

pH

2～4

color

Colorless ~ dark gray

[0056] Implementation Step 1: Oil Separation

[0057] Formic acid wastewater from epoxy soybean oil production first enters the grease trap. After water distribution and aeration, more than 99% of the oil in the wastewater floats to the surface, collects in the grease trap, and then flows into the recovery oil drum. The formic acid water in the lower layer is sent to the regulating tank through the automatic drainage device. ...

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Abstract

The present invention discloses a method for recycling and processing epoxy-ester sewage, relating to a technical method that resources are reclaimed from industrial wastewater to produce chemical products. The technical proposal of the invention is: formic acid sewage generated during the process of epoxy-ester production is treated by oil separating, and then formic acid solution is achieved by reaction with calcium carbonate; and the formic acid solution is further neutralized with calcium carbonate for a plurality of times after sedimentation; coagulant and precipitator are added into the solution to further remove heavy metal and solid impurities, and then is filtered, decolored, evaporated and dried to achieve formic acid powder. The process is applicable to the production of fodder-grade, industrial-grade and other grades of formic acids; besides, the process is characterized in less investment and high yield; and in addition, byproducts such as waste gas and waste water can be reclaimed for reuse. As a result, the reduction of waste water is realized and economic efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and relates to a technical method for recovering resources from industrial wastewater to produce chemical products, in particular to a process and equipment for recovering formic acid from epoxy ester wastewater to produce calcium formate. Background technique [0002] Epoxy ester plasticizers include epoxy methyl ester, epoxy soybean oil, etc. During the production process of such products, wastewater containing formic acid will be produced. The COD concentration is high and the treatment is difficult, which is one of the difficult problems in chemical wastewater treatment. one. [0003] At present, the production method of epoxidized soybean oil mainly adopts a solvent-free method, which is to generate an epoxidant by reacting formic acid with hydrogen peroxide under the action of a catalyst, and then add the epoxide dropwise to the soybean oil in a certai...

Claims

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Application Information

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IPC IPC(8): C07C53/06C07C51/41C01B31/20C02F9/04C02F1/40C02F1/52C01B32/50
Inventor 赵伟荣章金富沈健
Owner ZHEJIANG UNIV
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