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Method for processing sucralfate crystal mother solution and obtaining by-product sucrose octasulphate by nanofiltration membrane technology and application thereof

A technology of sucrose octasulfate and crystallization mother liquor, applied in chemical instruments and methods, osmotic/dialysis water/sewage treatment, sugar derivatives, etc., can solve problems such as large pollution, restrict the development of sucralfate, pollute the environment, etc. Good economic value and social value, conducive to sustainable development, the effect of solving environmental problems

Active Publication Date: 2016-06-01
ZHEJIANG HAISEN PHARMACY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the COD value in the mother liquor is high, if it is discharged directly, it will pollute the environment, and it will bring a large load to the wastewater treatment if it is discharged into the wastewater treatment station; and the recovery of sucrose octasulfate by evaporation will contain more salt in the concentrated solution , the purity of recovered products is too low, the energy consumption is high, and there is no recycling value
[0006] At present, it is mainly treated by flocculation and sedimentation, but this method often consumes a large amount of flocculant, steam, etc., resulting in problems such as high energy consumption and heavy pollution. These problems directly restrict the development of sucralfate production and do not meet the requirements National Energy Conservation, Emission Reduction, and Cleaner Production Requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add acid to the sucralfate mother liquor in the storage tank to adjust the pH to 3.0, pass through a 0.5μm filter to the circulation tank, and then inject it into the three-stage nanofiltration membrane cooperative concentration circulation device by the pressure pump, the interception of the first-stage nanofiltration membrane The molecular weight is 1400-1500 Daltons, the molecular weight cut-off of the second-stage nanofiltration membrane is 800-1000 Daltons, the molecular weight cut-off of the second-stage nanofiltration membrane is 500-600 Daltons, and the molecular weight cut-off of the third-stage nanofiltration membrane is The operating conditions are the same: the operating pressure is 0.5Mpa, and the operating temperature is 30°C; after concentration by nanofiltration, a concentrated solution with a sucrose octasulfate content of 4.5% is obtained, the rejection rate is 97.0%, and the COD value of the solution obtained by dialysis is 438.5mg / L .

Embodiment 2

[0030] Add acid to the sucralfate mother liquor in the storage tank to adjust the pH to 3.0, pass through a 0.5μm filter to the circulation tank, and then inject it into the three-stage nanofiltration membrane cooperative concentration circulation device by the pressure pump, the interception of the first-stage nanofiltration membrane The molecular weight is 1400-1500 Daltons, the operating pressure is 0.5Mpa, and the operating temperature is 10°C; the molecular weight cut-off of the second-stage nanofiltration membrane is 800-1000 Daltons, the operating pressure is 0.8Mpa, and the operating temperature is 30°C; The molecular weight cut-off of the third-stage nanofiltration membrane is 500-600 Daltons, the operating pressure is 1.0Mpa, and the operating temperature is 40°C; after being concentrated by the third-stage nanofiltration, a concentrated solution with a sucrose octasulfate content of 5.0% is obtained, and the rejection rate 99.0%, the COD value of the solution obtaine...

Embodiment 3

[0032] Add acid to the sucralfate mother liquor in the storage tank to adjust the pH to 3.0, pass through a 0.5μm filter to the circulation tank, and then inject it into the three-stage nanofiltration membrane cooperative concentration circulation device by the pressure pump, the interception of the first-stage nanofiltration membrane The molecular weight is 1000-1100 Daltons, the operating pressure is 0.5Mpa, and the operating temperature is 20°C; the molecular weight cut-off of the second-stage nanofiltration membrane is 800-1000 Daltons, the operating pressure is 1.0Mpa, and the operating temperature is 30°C; The molecular weight cut-off of the third-stage nanofiltration membrane is 500-600 Daltons, the operating pressure is 2.0Mpa, and the operating temperature is 40°C; after concentration by the third-stage nanofiltration, a dope with a sucrose octasulfate content of 5.0% is obtained, and the rejection rate 99.5%, the COD value of the solution obtained by dialysis is 415.5...

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Abstract

The invention discloses a method for processing a sucralfate crystal mother solution and obtaining a by-product sucrose octasulphate by a nanofiltration membrane technology. The method comprises the following steps: adjusting pH value of a sucralfate crystal mother solution to 2.5-3.0, and carrying out multistep nanofiltration membrane concentration treatment to obtain a sucrose octasulphate solution and processed wastewater. The invention also discloses an application of the method in production of sucralfate. By the nanofiltration concentration technology, the mother solution sucrose octasulphate can be concentrated, active ingredients can be recovered, and sucralfate is prepared; and COD of a solution obtained after dialysis is less than 500 mg / L, a permeate undergoes further processing to realize up-to-standard release, and load of a sewage treatment system is greatly reduced. Thus, yield of sucralfate is raised, and environmental protection problem of the technology is solved. The method is more beneficial to sustainable development of products and has very good economic value and social value.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and application for treating sucralfate crystallization mother liquor and by-producting sucrose octasulfate by utilizing nanofiltration membrane technology. Background technique [0002] Sucralfate, also known as Sucralfate, is white or off-white easy-flowing powder, odorless, almost tasteless, hygroscopic, almost insoluble in water, ethanol or chloroform, soluble in dilute hydrochloric acid or dilute sulfuric acid, and dilute in dilute hydrochloric acid or dilute sulfuric acid. It is slightly soluble in nitric acid, and changes color when the temperature reaches about 230°C. If it continues to be heated to 300°C, the color will turn brown. Because of its acid-reducing, astringent and pepsin-inhibiting effects, it can be used as a protective agent for the mucous membrane of the digestive system. It can complex with the protein of the gastric mucosa to form a...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D61/02C07H11/00C07H1/06C07H1/00
Inventor 艾林吴刚赵颂扬厉为民吴正鑫胡旭东王式跃
Owner ZHEJIANG HAISEN PHARMACY CO LTD