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Method for treating and utilizing potassium hydrogen tartrate mother liquor

A technology of potassium hydrogen tartrate mother and potassium hydrogen tartrate, which is applied in the field of processing and utilizing potassium hydrogen tartrate mother liquor, can solve the problems of resource waste and difficulty, and achieve the effect of reducing COD content and improving resource utilization

Active Publication Date: 2010-06-30
杭州瑞晶生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After centrifugation, the mother liquor is discharged into the sewage treatment station for treatment and then discharged. The process wastewater contains a large amount of organic matter, and the COD is as high as 100,000 mg / liter. It is very difficult to treat and causes a lot of waste of resources.

Method used

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  • Method for treating and utilizing potassium hydrogen tartrate mother liquor
  • Method for treating and utilizing potassium hydrogen tartrate mother liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Get 3 tons of process waste water in the production of DL-potassium hydrogen tartrate, be concentrated to relative density through thin-film evaporator decompression to 1.26 (pomi meter is measured, the same below), obtain 1 ton of concentrated solution, add catalyst (tungsten Na2SO4) 1kg, the temperature is controlled at 70-72 degrees Celsius, slowly add 400kg of hydrogen peroxide with a concentration of 27.5%, and keep the temperature for 24 hours. Thing and reclaim mother liquor, get throw out and obtain potassium hydrogen tartrate product 300kg, purity 95% (determined with 0.5mol / L sodium hydroxide solution titration).

[0016] Utilize the reclaimed mother liquor to carry out recovery in the same way, every 3 tons of secondary use of mother liquor can recover 260kg of product, and the product purity is 85%.

Embodiment 2

[0018] Get 3 tons of process wastewater in the production of DL-potassium hydrogen tartrate, and concentrate it to a relative density of 1.26 through a thin-film evaporator to obtain 1.1 tons of concentrated solution. Add 1.1 kg of catalyst (sodium tungstate) to the concentrated solution, and the temperature is controlled at 70-72 degrees Celsius, slowly add 440 kg of hydrogen peroxide with a concentration of 27.5%, and keep it warm for 24 hours. After the reaction, the reaction solution is heated to 95-100° C., kept warm for 2 hours, then cooled to room temperature, centrifuged, and the precipitate is taken to obtain 285 kg of potassium hydrogen tartrate product. The purity is 95% (determined by titration with 0.5mol / L sodium hydroxide solution).

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Abstract

The invention discloses a method for treating and utilizing potassium hydrogen tartrate mother liquor. The potassium hydrogen tartrate mother liquor takes maleic anhydride as raw material which is oxidized by hydrogen peroxide, alkali is added and the pH value is adjusted at 3.5-3.7, and the mother liquor containing the residual potassium maleic acid as shown in formula I after centrifugally preparing DL-potassium hydrogen tartrate is prepared. The method comprises the following steps: the potassium hydrogen tartrate mother liquor and the hydrogen peroxide are in oxidation reaction under the action of catalyst sodium tungstate, and the DL-potassium hydrogen tartrate as shown in formula II is prepared. The method has the benefits that through recycling the process wastewater, the COD content of the process wastewater is greatly reduced, the waste material is changed into useful material, the DL-potassium hydrogen tartrate is prepared by using the useful components in the process wastewater, and the resource utilization ratio is improved.

Description

(1) Technical field: [0001] The invention relates to a method for processing and utilizing potassium hydrogen tartrate mother liquor. (2) Background technology [0002] Potassium hydrogen tartrate chemical name: 2,3-dihydroxy potassium hydrogen succinate, it is a salt of tartaric acid, its appearance is colorless or slightly opaque crystal or white crystalline powder, 1g is dissolved in 165mL of 25℃ water, dissolved in 16mL of boiling water, dissolved in In 8820mL ethanol. Its saturated solution is acidic to litmus. Potassium hydrogen tartrate is divided into "L-potassium hydrogen tartrate" and "DL-potassium hydrogen tartrate". Potassium hydrogen tartrate for industrial use is DL-potassium hydrogen tartrate. [0003] The main purpose of industrial potassium hydrogen tartrate is to produce tartrate products such as potassium sodium tartrate and antimony potassium tartrate. The product is made of maleic anhydride as the main raw material, and tartaric acid solution is produ...

Claims

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Application Information

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IPC IPC(8): C07C59/255C07C51/367
Inventor 马志高王莉娜潘晋冀何国田
Owner 杭州瑞晶生物科技有限公司
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