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Method for comprehensive utilization of waste water generated in purifying process of citric acid

A technology of citric acid and calcium citrate, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of inability to deal with waste in a timely and effective manner, cost increase, waste of acid and lye and other issues, to achieve considerable economic benefits and environmental benefits, the effect of reducing the amount of consumption

Active Publication Date: 2011-11-16
RIZHAO JINHE BOYUAN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes up a large amount of land and has a great impact on the soil environment. The operation is cumbersome, and a lot of acid and lye are wasted, resulting in an increase in the cost of subsequent treatment.
Chinese patent CN101428914 proposes to add the cation exchange resin elution waste acid solution to copper-nickel electroplating alkaline sludge for neutralization, thereby simultaneously treating the cation exchange resin elution waste acid solution and the waste products of the electroplating industry, but the waste from two different industries It is really not easy to concentrate on a balanced treatment, and it is impossible to deal with various wastes in the production process in a timely and effective manner

Method used

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  • Method for comprehensive utilization of waste water generated in purifying process of citric acid
  • Method for comprehensive utilization of waste water generated in purifying process of citric acid
  • Method for comprehensive utilization of waste water generated in purifying process of citric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the newly prepared hydrochloric acid solution with a concentration of 4% into the invalid 1# carbon column. When the pH of the effluent wastewater is <3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0023] Put the newly prepared hydrochloric acid solution with a concentration of 4% into the invalid 2# cation resin exchange column. When the pH of the effluent wastewater is less than 3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0024] Use a pump from the waste hydrochloric acid tank to 30m 3 Neutralize barrel into 25m 3 waste hydrochloric acid water, and measure the acidity; start stirring, add calcium carbonate to neutralize to neutral; the solution is heated to 70 ° C, according to the ...

Embodiment 2

[0035] Put the newly prepared hydrochloric acid solution with a concentration of 4% into the invalid 1# carbon column. When the pH of the effluent wastewater is <3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0036] Put the newly prepared hydrochloric acid solution with a concentration of 4% into the invalid 2# cation resin exchange column. When the pH of the effluent wastewater is less than 3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0037] Use a pump from the waste hydrochloric acid tank to 20m 3 Neutralize barrel into 15m 3 waste hydrochloric acid water, and measure the acidity; start stirring, add calcium carbonate to neutralize to neutral; the solution is heated to 70 ° C, according to the ...

Embodiment 3

[0048] Put the newly prepared hydrochloric acid solution with a concentration of 3% into the invalid 1# carbon column. When the pH of the effluent wastewater is <3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0049] Put the newly prepared hydrochloric acid solution with a concentration of 3% into the invalid 2# cation resin exchange column. When the pH of the effluent wastewater is <3, the waste hydrochloric acid water starts to flow out. At this time, switch the valve and import the effluent waste hydrochloric acid water into the waste hydrochloric acid water tank;

[0050] Use a pump from the waste hydrochloric acid tank to 10m 3 The neutralization barrel is driven into 6.5m 3 waste hydrochloric acid water, and measure the acidity; start stirring, add calcium carbonate to neutralize to neutral; the solution is heated to 70 ° C, accordi...

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Abstract

The invention relates to a method for comprehensive utilization of waste water, in particular to a method for comprehensive utilization of waste water generated in a purifying process of citric acid. The method comprises the following steps of: collecting waste hydrochloric acid solution generated in a process of regenerating a carbon column and a cation exchange column, performing the neutral reaction of the waste hydrochloric acid solution and calcium salt or calcium alkali to form calcium chloride, performing the reaction of the calcium chloride and waste mother liquor of sodium citrate toform precipitate of calcium citrate to recover the citric acid; charging the waste alkali solution generated in the regeneration process of the anion-exchange column to the ineffective carbon column to neutralize heteroacid and pigments adsorbed on the carbon column. The method has the advantages of comprehensively utilizing the waste water generated in the purifying process of citric acid, changing the wastes into the valuables, reducing consumption of a regenerating agent, avoiding the environmental pollution due to the direct discharge of waste acid and alkali, and creating obvious economic benefits and environmentally protected benefits.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of wastewater, in particular to a method for comprehensive utilization of wastewater in a citric acid purification process. Background technique [0002] Citric acid is one of the most used organic acids in the world today. The citric acid produced by fermentation, no matter it is extracted by calcium salt method, ion exchange method or chromatography, the final extracted citric acid solution must be refined and purified. The process of refining and purifying citric acid is that the material is purified by carbon column, cation resin exchange column and anion resin exchange column for multi-layer purification to obtain pure citric acid. After using this process, every time a certain amount of citric acid is purified, the carbon column, cation resin exchange column and anion resin exchange column will be invalidated, so they will be regenerated every once in a while to restore their functi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/265C01F11/24C07C51/02C07C51/47C02F9/14C02F1/66C02F3/28
Inventor 寇光智李昌涛楼良旺
Owner RIZHAO JINHE BOYUAN BIOCHEM