Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for recovering mandelic acid from waste water

A technology for mandelic acid and waste water, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve problems such as high energy consumption, high solubility of mandelic acid, increase pollution, etc., and achieve safe operation and recovery methods. Simple and efficient effect

Active Publication Date: 2013-12-18
JIANGSU BAOZONG & BAODA PHARMACHEM
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, in fermentation, chemical synthesis and chemical application separation, mandelic acid is used in large quantities, and there is a large amount of mandelic acid in the fermented yeast liquid and in the mother liquor separated. If this part of the mandelic acid mother liquor is directly discarded as waste water, That is to waste resources and increase pollution, and its recovery is not easy, mandelic acid has a high solubility in water, relying on traditional concentration and crystallization, not only is inefficient, but also consumes a lot of energy. Generally, the content of the mother liquor is between a few percent and Thirty percent varies, so relying on traditional concentrated crystallization to recover mandelic acid is neither economical nor a good solution to the problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: In a 500 ml four-neck flask equipped with a thermometer and a stirring device, start stirring, add 250 g of waste water containing 20% ​​mandelic acid in sequence, and add sodium hydroxide to adjust the pH value to 7-14.

[0018] Step 2: Add the calcium chloride aqueous solution of 0.6 mole of mandelic acid to the waste water of pH value adjustment, slowly have solid to separate out, after the precipitation is complete, solid is filtered out and dried to obtain 101.3g mandelic acid calcium salt.

[0019] Step 3: In a 1000 ml four-neck flask equipped with a thermometer and a stirring device, add 101.3 g of calcium mandelate obtained by drying, add water with a weight ratio of 3 times, start stirring, and add hydrochloric acid dropwise therein until it is completely dissolved , after dissolving, stop adding hydrochloric acid dropwise, add acetone with 0.1 times the specific gravity of water, stop stirring after a white solid is precipitated, after the precipitation...

Embodiment 2

[0021] Step 1: In a 1000 ml four-neck flask equipped with a thermometer and a stirring device, start stirring, add 500 g of waste water containing 20% ​​mandelic acid in sequence, and add sodium hydroxide to adjust the pH value to 7-14.

[0022] Step 2: Add 0.65 mole calcium sulfate aqueous solution of mandelic acid to the waste water adjusted by pH value, slowly solids are precipitated, and after the precipitation is complete, the solids are filtered out and dried to obtain 210.6 g of mandelic acid calcium salt.

[0023] Step 3: In a 2000 ml four-neck flask equipped with a thermometer and a stirring device, add 210.6 g of calcium mandelate that has been dried, add water with a weight ratio of 3 times, start stirring, and add hydrochloric acid dropwise therein until it is completely dissolved , after dissolving, stop adding sulfuric acid dropwise, add acetone with 0.1 times the specific gravity of water, stop stirring after a white solid is precipitated, after the precipitation...

Embodiment 3

[0025] Step 1: In a 1000 ml four-neck flask equipped with a thermometer and a stirring device, start stirring, add 500 g of waste water containing 10% mandelic acid in sequence, and add sodium hydroxide to adjust the pH value to 7-14.

[0026] Step 2: Add 0.65 mole calcium chloride aqueous solution of mandelic acid to the waste water adjusted by pH value, slowly solids are precipitated, and after the precipitation is complete, the solids are filtered out and dried to obtain 99.8g mandelic acid calcium salt.

[0027] Step 3: In a 1000 ml four-neck flask equipped with a thermometer and a stirring device, add 99.8 g of calcium mandelate obtained by drying, add water with a weight ratio of 3 times, start stirring, and add hydrochloric acid dropwise therein until it is completely dissolved , after dissolving, stop adding hydrochloric acid dropwise, add 0.1 times of water specific gravity acetone, after a white solid precipitates, stop stirring, after the precipitation is complete, f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recovering mandelic acid from waste water. The method comprises the following steps: adding alkali to the waste water which contains the mandelic acid to regulate the PH value; then adding calcium or magnesium ions to generate calcium / magnesium mandelate; depositing, filtering deposited mandelate, and then reducing the mandelic acid by using strong acid in an appropriate solvent; crystallizing to obtain a pure product. The recovery method disclosed by the invention has the advantages of simplicity, high efficiency, safety in operation and suitability for industrial production.

Description

technical field [0001] The invention relates to a method for recovering organic acids, in particular to a method for recovering mandelic acid from waste water. Background technique [0002] Nowadays, in fermentation, chemical synthesis and chemical application separation, mandelic acid is used in large quantities, and there is a large amount of mandelic acid in the fermented yeast liquid and in the mother liquor separated. If this part of the mandelic acid mother liquor is directly discarded as waste water, That is to waste resources and increase pollution, and its recovery is not easy, mandelic acid has a high solubility in water, relying on traditional concentration and crystallization, not only is inefficient, but also consumes a lot of energy. Generally, the content of the mother liquor is between a few percent and It varies from 30% to 30%, so it is neither economical nor a good solution to the problem to recover mandelic acid by traditional concentrated crystallization...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/50C07C51/487
Inventor 王琳朱志勇陈荣
Owner JIANGSU BAOZONG & BAODA PHARMACHEM