Method for recovery of organic acid from dilute aqueous solution

A technology of organic acid and aqueous solution, applied in the field of separation and recovery of one or more organic acids, to achieve the effect of high carboxylic acid yield
CN103429307AInactive Publication Date: 2013-12-04KEMIRA OY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KEMIRA OY
Publication Date
2013-12-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a method and an arrangement for recovery of at least one organic acid from a dilute aqueous solution thereof. In this method a complex between said organic acid and an extractant is formed by contacting the solution with a reactive extractant and dissolving the formed complex into said extractant thus forming an extractant phase. The organic acid is removed from the formed complex by esterification using an alcohol.
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Description

field of invention

[0001] The present invention relates to a method for separating and recovering one or more organic acids from aqueous solutions low in organic acids. In particular, the method of the invention relates to the separation of pure carboxylic acids from dilute aqueous solutions. Background of the invention

[0002] Several industrial-scale processes are known to produce dilute wastewater solutions containing low levels of carboxylic acids. Recovery of these acid components is becoming increasingly important for environmental reasons. Recovery of these economically valuable by-products is typically by distillation or extractive distillation, which are efficient but energy-intensive and technically challenging processes because it forms azeotropes or stable emulsions that make Processing is uneconomical or provides the product in an undesired form, eg a solution that is too dilute to be used in further processes.

[0003] In many cases, carboxylic acids produc...

Claims

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