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Advanced waste treatment process in process of production of long chain dibasic acid by fermentation method

A long-chain dibasic acid, advanced treatment technology, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve yield loss and production yield is less than 85% and other problems, to achieve the effects of reducing the amount of consumption, reducing the amount of CO2 waste gas released, and shortening the wastewater treatment time

Inactive Publication Date: 2008-12-31
天津市凯奥生物制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the discharged waste liquid, the dibasic acid content still reaches about 0.8%, resulting in about 15% yield loss, and the production yield is generally lower than 85%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Take 500 mL of filtered waste water (COD about 22000 mg / L) from the production of tridecanedibasic acid by fermentation, and adjust its pH value to 1 with concentrated sulfuric acid under sufficient stirring. Let it settle. 0.67 g of mixed acid is obtained. Take 200mL supernatant (COD about 9912mg / L), add 10mL 25% H 2 o 2 solution, add 4 g FeSO in about 0.5 hours 4 solution of ferrous iron. After the addition, the solution was heated up to 70-75°C, during which flocculent precipitation was produced, and when the precipitation reached the maximum value, the temperature was lowered, and after the precipitation was separated (about 0.1 gram of mixed solid acid was obtained), the supernatant (COD approx. 3752mg / L) continue to drop H 2 o 2 (During this process, take a sample at an appropriate time, and measure the COD of the solution according to GB11914-89 "Determination of Chemical Oxygen Demand in Water by Potassium Dichromate Method" for the neutralized ...

Embodiment 2

[0022] Example 2: Get 500mL of filtered waste water (COD about 22000mg / L) from the production of tridecanedibasic acid by fermentation method, and adjust its pH value to 3 with concentrated sulfuric acid under sufficient stirring and at room temperature. It was allowed to settle and about 0.6 g of the mixed acid was isolated. Take 200mL supernatant (COD about 11805mg / L), add 6g solid FeSO 4 ·7H 2 O, after all dissolved, slowly add 10mL of 35% H 2 o 2 solution, the addition time was approximately 1.5 hours. The temperature of the solution is automatically raised to 50-55°C. During this process, flocculents are precipitated. After the precipitates are separated, 20mL of H 2 o 2 (During this process, take a sample at an appropriate time, and measure the COD of the solution according to GB11914-89 "Determination of Chemical Oxygen Demand in Water by Potassium Dichromate Method" for the neutralized sample). Finally, add sodium hydroxide to adjust the pH value of the solution ...

Embodiment 3

[0023] Example 3: Take 500 mL of filtered waste water (COD about 22000 mg / L) from fermentative production of tridecanedioic acid, adjust its pH value to 2 with concentrated sulfuric acid at 10° C. under full stirring. It was allowed to settle and about 0.65 g of the mixed acid was isolated. Take 200mL supernatant (COD about 10228mg / L), add 10g solid FeSO 4 ·7H 2 O, after all dissolved, slowly add 6mL of 30% H 2 o 2 solution, the addition time was approximately 1.5 hours. The temperature of the solution was raised to 40-45°C. During this process, flocculents were precipitated. After the precipitates were separated, 15 mL of 35% H2O was added dropwise. 2 o 2 solution. Finally, add sodium hydroxide to adjust the pH value of the solution to 7-8. After separating the iron sludge produced, the COD of the resulting solution is about 1088 mg / L, and the contents of tridecane dibasic acid, dodecane dibasic acid and undecane dibasic acid in the recovered mixed dibasic acid are 92....

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PUM

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Abstract

The invention discloses a deep treatment method for the wastewater from the technique for producing long-chain dibasic acids by fermentation method. In the method, acid is used for adjusting the pH value of the wastewater to be discharged; after sedimentation, supernatant fluid is added with proper amount of oxidizing agent, precipitate is separated from the solution once more, oxidizing agent is added again in the supernatant fluid obtained by separation for deep chemical oxidation until the COD of the treated water solution meets the requirements. Then alkali is used for neutralizing the water solution to neutrality and after iron sludge is separated out, the water can be discharged into a second-grade pipe network. The method can recycle about 80% of organic dibasic acid by controlling the adding amount of the oxidizing agent, and has short wastewater treatment time, low dosage of the oxidizing agent and little emission amount of CO2 waste gas. The recycled dibasic acid can be used for preparing fine chemical products such as cold resistant plasticizer, high class lubricating oil, high temperature dielectric medium, high-grade hot-melt adhesives, high-grade paint, and the like; and the iron sludge produced can be used for producing iron series pigments.

Description

【Technical field】 [0001] The invention relates to the field of waste water treatment and utilization of resources and environment, in particular to a method for advanced treatment of waste water in the process of producing long-chain dibasic acid by fermentation. 【Background technique】 [0002] Long-chain dibasic acid is a kind of fine chemical intermediate with wide application, which can be used to synthesize a series of high added value such as special nylon, spices, cold-resistant plasticizer, high-grade lubricating oil, high-temperature dielectric, high-grade hot-melt adhesive and high-grade coating special chemicals. Among its various production methods, the biological fermentation method has great advantages in terms of synthesis difficulty and economy compared with the chemical synthesis method. Therefore, the production technology of the new long-chain dibasic acid adopts the biological fermentation technology. Taking tridecane dibasic acid as an example, the biolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/72
Inventor 沈润孙波张德光刘玉喜
Owner 天津市凯奥生物制品有限公司
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