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A method of utilizing waste water containing formic acid

A technology for formic acid wastewater and formic acid, which is applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation and other directions, can solve the problems of heavy burden, difficulty, and lack of sewage treatment technology for enterprises, so as to improve treatment efficiency and save money. The effect of simple cost and process flow

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Formic acid-containing wastewater with high COD concentration produced by the aforementioned production of epoxy soybean oil and epoxy methyl ester, because its main pollutant is formic acid, on the one hand, it lacks corresponding mature sewage treatment technology, on the other hand, it directly treats wastewater to the final It is very difficult to discharge waste water up to the standard, and the burden on enterprises is heavy. Therefore, it is necessary to find another way to recover formic acid in waste water, so as to realize the effective utilization of resources and reduce the cost of sewage treatment, and even realize the final zero discharge of sewage

Method used

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  • A method of utilizing waste water containing formic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0040] as attached figure 1 As shown, the waste water containing formic acid is sent to the still 1 (the still 1 is decompressed through the decompression system 3) for vacuum distillation, and the conditions of the vacuum distillation are such that components with a boiling point not higher than formic acid are distilled out , the obtained mixed gas containing formic acid vapor and water vapor directly enters the reactor 2 through the conduit connecting the distillate outlet of the still 1 to the feed port of the reactor 2 (the reactor 2 is decompressed through the decompression system 3) in contact with slurries containing calcium carbonate;

[0041] Concentrate the product obtained by contacting under reduced pressure to obtain a concentrated solution, then filter the concentrated solution obtained by concentrating under reduced pressure, and dry the filtered solid to obtain calcium formate.

[0042] According to the method of the present invention, the calcium carbonate s...

Embodiment 1

[0047] according to figure 1 The shown flow process carries out the method of the present invention utilizing waste water containing formic acid.

[0048] Wherein, 200g of soybean oil methyl ester epoxidation waste liquid (wherein, pH value is 2.8, COD concentration is 12000mg / L, formic acid content is 6 weight %, The content of hydrogen peroxide is 0.9% by weight, the concentration of oily substances is 0.055% by weight, and the rest is water), and 10g of calcium carbonate and 20g of deionized water are charged in the reactor 2 (the reactor 2 is provided with a mechanical stirring paddle and a pH meter). And stirring beating obtains calcium carbonate slurry; And distillation still 1 and reactor 2 carry out the control of pressure by same decompression system 3, and concrete process is as follows:

[0049] (1) Raise the temperature of the liquid in distillation kettle 1 to 65°C, and the temperature of liquid in reaction kettle 2 to 55°C, and start the decompression system 3 t...

Embodiment 2

[0052] according to figure 1 The shown flow process carries out the method of the present invention utilizing waste water containing formic acid.

[0053] Wherein, 200g of soybean oil epoxidation waste liquid (pH value is 2.2, COD concentration is 20000mg / L, formic acid content is 7% by weight, hydrogen peroxide content is 200g as the soybean oil epoxidation waste water of formic acid waste water described in the present invention is loaded into distillation still 1. 0.8% by weight, the concentration of lipids is 0.055% by mass, and the rest is water), and 12g of calcium carbonate and 20g of deionized water are charged into the reactor 2 (the reactor 2 is provided with a mechanical stirring paddle and a pH meter) and stirred for beating Obtain calcium carbonate slurry; And distillation still 1 and reactor 2 carry out the control of pressure by same decompression system 3, and concrete process is as follows:

[0054] (1) Raise the temperature of the liquid in distillation kett...

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Abstract

The invention provides a method for utilizing waste water containing formic acid. The method comprises the following steps: carrying out reduced pressure distillation on the waste water containing formic acid so as to obtain gas mixture containing formic acid steam and water steam, wherein the waste water containing formic acid contains formic acid, water and grease substance; enabling the gas mixture containing formic acid steam and water steam to be directly contacted with slurry containing calcium carbonate. According to the method provided by the invention, the reduced pressure distillation is carried out on the waste water containing formic acid so as to obtain the gas mixture containing formic acid steam and water steam, and then the gas mixture containing formic acid steam and water steam is directly contacted with the slurry containing calcium carbonate, so that the method provided by the invention can efficiently recycle formic acid from the waste water containing the formic acid and is high in yield of calcium formate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a method for recycling resources from industrial waste water to produce chemical products, in particular to a method for utilizing waste water containing formic acid. Background technique [0002] Epoxy ester plasticizers include epoxy methyl ester, epoxy soybean oil and other products. During the production of such products, wastewater containing formic acid will be generated. The concentration of COD (chemical oxygen demand) is high and the treatment is difficult. It is a chemical wastewater One of the difficult problems to deal with. [0003] The production of epoxidized soybean oil mainly uses refined soybean oil, formic acid, and hydrogen peroxide as raw materials. Under certain conditions, the refined soybean oil is epoxidized to produce epoxidized soybean oil. After the reaction is completed, it is washed with alkali, wash...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/06C07C51/41C02F1/04C02F103/36
CPCC02F1/04C02F2103/36C07C51/412C07C53/06
Inventor 胡见波杜泽学
Owner CHINA PETROLEUM & CHEM CORP
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