Desalination and purification method of pentasodium diethylenetriamine pentaacetic acid (DTPA)

A purification method, pentasodium salt technology, which is applied in the field of desalination and purification of DTPA pentasodium salt, can solve the problems of inconvenient production management, restrictions, high salt content, etc., achieve good social and economic benefits, reduce environmental protection investment, and reduce environmental pollution.
CN103601648BActive Publication Date: 2015-03-25YIXING FENGZE CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YIXING FENGZE CHEM
Publication Date
2015-03-25

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Abstract

The invention discloses a desalination and purification method of pentasodium diethylenetriamine pentaacetic acid (DTPA) and belongs to the field of chemical purification. The purification method comprises the steps of adding deionized water in a crude product pentasodium DTPA solution to obtain a diluent and regulating the pH (potential of Hydrogen) of the diluent to 11-11.5; carrying out desalination separation on the obtained diluent under the pressure of 1-3MPa by adopting a nanofiltration membrane with the molecular weight cut-off of 100-300, thus respectively obtaining a pentasodium DTPA desalination liquid and saline water; and continuously adding the deionized water in the pentasodium DTPA desalination liquid obtained through the separation and carrying out circular desalination separation under the pressure of 1-3MPa by adopting the nanofiltration membrane with the molecular weight cut-off of 100-300 till the salinity of the obtained pentasodium DTPA desalination liquid is below 0.5%. The method for removing the sodium chloride of the pentasodium DTPA has the advantages of high efficiency, rapidness, easiness in control and the like; in addition, by adopting the method, the pentasodium DTPA purifying yield can be up to more than 98%.
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Description

technical field

[0001] The invention relates to the field of chemical purification, in particular to a method for desalination and purification of DTPA pentasodium salt. Background technique

[0002] Diethylenetriaminepentaacetic acid (DTPA) is an important aminocarboxyl complexing agent, and its pentasodium salt is often used in practical applications. It has a particularly strong complexing ability for metal ions, especially high-valence metal ions. The stability and antioxidant capacity of metal ions forming chelates are stronger than those of ethylenediaminetetraacetic acid (EDTA). , Textile, leather and other industries have important applications, and in recent years its application in medical research is also deepening.

[0003] The DTPA industrial production method has following two kinds at present: the first kind of method is the chloroacetic acid method, CN101607921A a kind of preparation method of diethylenetriaminepentaacetic acid, the research of pentasodium d...

Claims

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