Method for extracting sulfamonomethoxine from sulfamonomethoxine sodium alkali liquor

Abstract

The invention provides a method for extracting sulfamonomethoxine from sulfamonomethoxine sodium alkali liquor. The method comprises the following steps: sulfamonomethoxine sodium alkali liquor is used as a raw material; a method of combining circulating dilution nanofiltration and a bipolar membrane electrodialysis technology is adopted; and sulfamonomethoxine sodium is continuously intercepted through a nanofiltration membrane within a limited pressure flow range, sodium hydroxide is removed, sulfamonomethoxine sodium is acidified by using a bipolar membrane electrodialysis device, and sulfamonomethoxine sodium is separated out in a sulfamonomethoxine form to finish clean recovery of resources. According to the method provided by the invention, mixed produced water of sulfadimethoxine sodium alkali liquor after three times of nanofiltration is a sodium hydroxide solution without sulfadimethoxine sodium, and a concentrated water tank is a sulfadimethoxine sodium aqueous solution withthe sodium hydroxide content lower than 2%.

Description

technical field [0001] The invention belongs to the field of industrial sewage treatment and relates to a method for extracting sulfadimethoxine from sulfadimethoxine sodium lye. Background technique [0002] Sulfadimethoxine sodium is a sulfonamide antibacterial drug. During its production process, excessive sodium hydroxide needs to be added to produce sulfadimethoxine sodium, but this step will cause a large amount of sodium hydroxide to exist in the system. Traditional The process is to neutralize the sulfadimethoxine sodium lye with hydrochloric acid to precipitate the sulfadimethoxine sodium, which not only needs to add a large amount of hydrochloric acid, but also produces a large amount of high-salt wastewater, resulting in waste of resources. Therefore, there is an urgent need for a new treatment process to cleanly separate sulfadimethoxine sodium from sodium hydroxide and improve the recycling rate, so as to solve the pain point of resource waste in the current mar...

AI Technical Summary

Problems solved by technology

[0002] Sulfadimethoxine sodium is a sulfonamide antibacterial drug. During its production process, excessive sodium hydroxide needs to be added to produce sulfadimethoxine sodium, but this step will cause a large amount of sodium hydroxide to exist in the system. Traditional The process is to neutralize the sulfadimethoxine sodium lye with hydrochloric acid to precipitate the sulfadimethoxine sodium, which not only needs to add a large amount of hydrochloric acid, but also produces a large amount of high-salt wastewater, resulting in a waste of resources

Therefore, there is an urgent need for a new treatment process to cleanly separate sulfadimethoxine sodium from sodium hydroxide and improve the recycling rate, so as to solve the pain point of resource waste in the current market

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