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Method for treating waste water obtained during synthesis of vitamin B6 through oxazole method

A technology of vitamin and oxazole method, which is applied in the field of wastewater treatment of vitamin B6 synthesized by oxazole method, which can solve the problems of high cost, high difficulty and complicated steps

Active Publication Date: 2014-06-04
HUAZHONG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a new approach, innovates the traditional treatment method with complicated steps, high cost and high investment, and solves the common problem that the oxazole synthesis of vitamin B6 production wastewater has a large amount of treatment and is difficult, and the treated wastewater is difficult to meet the discharge standard. Efficient and environmentally friendly, energy saving, simple steps, easy to operate, low cost, the treated vitamin B6 wastewater meets the "Chemical Synthesis Pharmaceutical Industry Water Pollutant Discharge Standard" (GB1904-2008)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] One ton of 4-methyl-5-ethoxyoxazole production process produced in the cyclization section of the treated waste water separated from triethylamine, black red, COD concentration of 4.25 × 10 4 mg / L, the phosphate content is 4.17% (mass percentage concentration), 75kg calcium chloride is added for neutralization reaction, the time is controlled for 2 hours, the reaction temperature is controlled at 50-65°C until the pH value is 7.0, and centrifuged in a centrifuge Carry out solid-liquid separation, keep the liquid at 25-30°C after separation, add sulfuric acid to adjust the pH value to 3.5 under stirring, then continue to keep at 25-30°C, add 2kg of ferrous sulfate, stir for 30 minutes, then add 30% (mass percentage Concentration) hydrogen peroxide aqueous solution 35kg, keep 25~30℃ and mix and stir for 12 hours, then add sodium hydroxide to adjust the pH value to 8.0, get light yellow, COD concentration is 3200 mg / L, phosphate content is 0.85% (mass percentage Concentra...

Embodiment 2

[0010] Two tons of 4-methyl-5-ethoxyoxazole preparation process The waste water that has been treated and separated from triethylamine produced by the ring closure section of the production process is black and red, and the COD concentration is 4.85×10 4 mg / L, the phosphate content is 4.52% (mass percentage concentration), 160kg calcium chloride is added for neutralization reaction, the time is controlled for 2 hours, the reaction temperature is controlled at 50-65°C, and the pH value is 7.2, using a plate and frame machine Press filtration for solid-liquid separation. After separation, keep the liquid at 25-30°C, add sulfuric acid to adjust the pH value to 3.5 under stirring, then continue to maintain 25-30°C, add 20kg of ferrous sulfate, stir for 30 minutes, then add 30% ( mass percent concentration) of hydrogen peroxide aqueous solution 76kg, kept at 25-30°C for 13 hours and then mixed and stirred for 13 hours, then added sodium hydroxide to adjust the pH value to 8.5, to o...

Embodiment 3

[0012] Five tons of 4-methyl-5-ethoxyxazole preparation process produced wastewater from the ring closure section that has been treated and separated from triethylamine, black and red, with a COD concentration of 4.60×10 4 mg / L, the phosphate content is 4.20% (mass percentage concentration), and 370kg calcium chloride is added for neutralization reaction. Filtrate for solid-liquid separation. After separation, keep the liquid at 25-30°C. Add sulfuric acid to adjust the pH value to 3.8 while stirring. Then continue to maintain 25-30°C. Add 75kg of ferrous sulfate. After stirring for 30 minutes, add 30% (mass percentage concentration) of hydrogen peroxide aqueous solution 200kg, kept at 25 ~ 30 ° C for 15 hours, after mixing and stirring for 15 hours, added sodium hydroxide to adjust the pH value to 9.0, to obtain light yellow, COD concentration of 3200 mg / L, phosphate content of 0.80% (mass percentage concentration) liquid, combined with other process wastewater and transfer...

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Abstract

The invention relates to a method for treating waste water obtained during synthesis of vitamin B6 through an oxazole method. The method is characterized in that the waste water obtained during the synthesis of vitamin B6 through the oxazole method is treated separately. The method comprises the following steps of: independently treating the waste water which is high in COD (Chemical Oxygen Demand) concentration and is of deep color and contains high-concentration phosphate in the cyclization section of a 4-methyl-5-ethoxy oxazole procedure, adding calcium chloride to the waste water to generate calcium phosphate precipitations; carrying out solid-liquid separation, adding sulfuric acid to obtained liquid to regulate pH value, and then adding ferrous sulfate and hydrogen peroxide, stirring; adding sodium hydroxide to regulate the pH value, then mixing with the waste water obtained from the other procedures, and treating in a biochemical pool; discharging the waste water which reaches the standard. The method disclosed by the invention innovates the traditional vitamin B6 water waste treatment method which has the disadvantages of high investment, high cost and complicated steps and solve the problems that the vitamin B6 waste water is large in treatment amount and high in treatment difficulty and the treated waste water difficultly reaches the standard; moreover, the method provided by the invention is energy-saving, environmental-friendly, simple, easy to operate and low in cost. According to the invention, the treated vitamin B6 waste water reaches the "chemical synthetic pharmaceutical industry water pollutant discharge standard" (GB1904-2008).

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method for vitamin B6 synthesis by an oxazole method. Background technique [0002] Vitamin B6 is one of the essential vitamins for the human body. It is an essential substance for the metabolism of fat and sugar in the human body. It is a component of certain coenzymes in the human body and participates in various metabolic reactions. It is widely used in the fields of medicine, food, feed additives and cosmetics industries. At present, the advanced oxazole (4-methyl-5-ethoxy oxazole) process is widely used at home and abroad to replace the old route pyridone process, making the vitamin B6 production process reach a new level. Its main process is divided into three steps: esterification reaction to prepare N-ethoxyoxalylalanine ethyl ester; cyclization reaction to prepare 4-methyl-5-ethoxyoxazole; vitamin B6 crude product preparation and purification. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 王勇付林李桂莲魏旭力廖俊仇玲玲汤鑫欣
Owner HUAZHONG PHARMA