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Method for treating wastewater formed by producing hydrocortisone by adopting chromic anhydride and application of method

A technology of hydrocortisone and treatment methods, applied in chemical instruments and methods, inorganic chemistry, organic chemistry, etc., can solve the problems of chromic anhydride toxicity, etc., achieve the effect of reducing environmental protection pressure, reducing material waste, and simple process steps

Inactive Publication Date: 2019-05-31
YANGZHOU ZHONGTIANLI NEW MATERIAL
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Problems solved by technology

Chromic anhydride is toxic, and the industrial wastewater produced by the oxidation process contains a large amount of Cr 6+ and Cr 3+ , where C 6+ It is a highly toxic substance. Once it is ingested into the human body and reaches a certain amount, it will cause cancer. Many researchers and producers have hoped to replace chromic anhydride with other oxidants, and these methods are still under verification.

Method used

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  • Method for treating wastewater formed by producing hydrocortisone by adopting chromic anhydride and application of method

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Experimental program
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Effect test

Embodiment 1

[0034]1. Take 8L of waste water from the washing section after chromic anhydride oxidation and add it to the reactor, then add sodium hydroxide to the reactor, adjust the pH value of the mixed system to 7.8, filter the insoluble matter through a filter, and then raise the temperature to 85 °C, blow in clean air until the solution turns dark brown, and keep blowing in air for 1 hour.

[0035] 2. Sulfuric acid oxidation:

[0036] Evaporate the above reactor to remove moisture. When the material is viscous, slowly add sulfuric acid aqueous solution with a concentration of 70% (wt) to the above solution until the pH value of the mixed system reaches 6.8. After the reaction, the solution will CrO 4 2- fully converted to Cr 2 o 7 2- , and form sodium sulfate crystals.

[0037] Then filter to remove the crystals of sodium sulfate, and dry the remaining solution to obtain a mixture containing sodium sulfate and sodium dichromate.

[0038] The products are respectively: 285 g of...

Embodiment 2

[0040] 1. Take 10L of wastewater from the washing section after oxidation of chromic anhydride, add sodium hydroxide, adjust the pH value to 8.5, filter through a filter to remove insoluble matter, then raise the temperature to 75°C, blow in clean air until the solution turns dark brown brown and continue to sparge with air for 1.5 hours.

[0041] 3. Sulfuric acid acidification dehydration:

[0042] Evaporate the above reactor to remove moisture. When the material is viscous, slowly add sulfuric acid aqueous solution with a concentration of 60% (wt) to the above solution dropwise, adjust the pH to 7, and react to make the CrO in the solution 4 2- fully converted to Cr 2 o 7 2- , and form sodium sulfate crystals.

[0043] Crystals of sodium sulfate were removed by filtration, and the obtained aqueous solution was dried to obtain a mixture containing sodium sulfate and sodium dichromate.

[0044] The products are respectively: 350 g of sodium sulfate crystals, and 730 g of...

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Abstract

The invention discloses a method for treating wastewater formed by producing hydrocortisone by adopting chromic anhydride and an application of the method, and relates to the technical field of hydrocortisone preparation. The method includes mixing the wastewater formed by producing the hydrocortisone by adopting the chromic anhydride with a sodium hydroxide aqueous solution; filtering to remove insoluble substances; heating the mixed solution; adding excess oxygen for an oxidation reaction; evaporating the obtained material to remove water until the material is viscous; adding a concentratedsulfuric acid aqueous solution for an acidification reaction; filtering to obtain the aqueous solution; and drying the solution to obtain a mixture containing sodium sulfate and sodium dichromate. Thechromium-containing mixed salt treated by the method can replace the chromic anhydride to preform a reoxidation reaction, so that the environmental protection pressure produced by current hydrocortisone enterprises is relieved; the bipolar membrane treatment is preformed on the byproduct sodium sulfate obtained after treatment to obtain a sodium hydroxide and sulfuric acid solution; and after reprocessing, the sodium hydroxide and sulfuric acid solution is recycled to a treatment section of chromium-containing wastewater, so that materials in the whole process are recycled, and material wasteis reduced.

Description

technical field [0001] The invention relates to the technical field of hydrocortisone preparation, in particular to the recycling technology of chromic anhydride used therein. Background technique [0002] Hydrocortisone is a glucocorticoid, which is the most produced variety among hormone drugs. Hydrocortisone can affect glucose metabolism and has anti-inflammatory, anti-viral, and anti-allergic effects. It is mainly used for the replacement therapy of adrenal insufficiency and the treatment of congenital adrenal hyperplasia. It can also be used for rheumatoid arthritis, rheumatic fever, gout, bronchial asthma, allergic diseases, and for severe infections and Anti-shock treatment, etc. [0003] At present, the preparation of hydrocortisone both at home and abroad adopts a semi-synthetic method. That is, the compound containing the above-mentioned steroidal basic skeleton is obtained from natural products as raw materials, and then structurally modified by chemical methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07J5/00C07J13/00C25B1/16C25B1/22C01G37/14C01D5/00C01D5/02
Inventor 吴宗斌
Owner YANGZHOU ZHONGTIANLI NEW MATERIAL
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