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Treatment method of L-gulonic acid secondary mother liquor

A treatment method and technology of gulonic acid, which are applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc. Good economic and social benefits, reduced wastewater treatment volume, and significant economic benefits

Inactive Publication Date: 2013-07-10
山东润鑫投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the primary mother liquor of gulonic acid prepared by this method is extracted once again, the remaining substance is the secondary mother liquor of L-gulonic acid. This mother liquor is brownish black mucus, and the COD value and BOD value seriously exceed the standard and cannot be discharged directly. The traditional biochemical method Treatment of waste mother liquor, not only the cost of wastewater treatment is high, but also the effluent does not meet the national discharge standards
[0003] In the prior art, the secondary mother liquor of L-gulonic acid is directly treated with concentrated nitric acid oxidant to produce oxalic acid. However, due to the large amount of treatment and the high consumption of concentrated nitric acid, large-scale industrial production cannot effectively solve the problem of environmental pollution caused by waste water and waste gas.
[0004] Therefore, a technical problem that needs to be urgently solved by those skilled in the art is: how to innovatively propose a treatment method for the secondary mother liquor of L-gulonic acid, so as to solve the problems existing in the prior art and effectively reduce the processing cost of process realization. amount, and effectively solve the pollution problem of waste water and waste gas to the environment

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0047] The secondary mother liquor of L-gulonic acid is first extracted and extracted, and the secondary mother liquor of L-gulonic acid contains about 40% gulonic acid, and 1 / 2 volume of methanol is added to the mother liquor of gulonic acid, Then, 30% NaOH solution was added dropwise with stirring, and the temperature was lowered with cold water during the dropwise addition. When the pH value of the inner liquid reaches 4.0, control the temperature in the reaction device to 40°C, react for 3 hours, then cool down to 20°C, then cool down to 0°C with ice-salt water and centrifuge, collect the solids and dry them to recover gulong acid.

[0048] Concentrate under reduced pressure the dilute solution from which most of the gulonic acid has been extracted, distill off methanol and part of the water from the mother liquor, and stop heating and lower the temperature when the concentration of the inner liquor reaches 40%. The distilled methanol aqueous solution is sent to the methan...

Embodiment 2

[0053] Extract and neutralize the L-gulonic acid secondary mother liquor: the L-gulonic acid secondary mother liquor contains about 40% gulon acid; add 1 / 2 volume of ethanol to the gulong acid mother liquor, Then stir and add 30% NaOH solution dropwise. During the dropping process, cool down with cold water. When the pH value of the inner liquid reaches 4.5, control the inner temperature of the reaction device at 45°C and react for 4 hours. After cooling down to room temperature at 20°C, cool down to After centrifugation at 0°C, collect the solid matter and dry it to recover gulong acid.

[0054] Concentrate under reduced pressure the dilute solution from which most of the gulonic acid has been extracted, distill off ethanol and part of the water from the mother liquor, and stop heating and cool down when the concentration of the inner liquor reaches 45%. The distilled ethanol aqueous solution is sent to the ethanol recovery tower for recovery.

[0055] Oxidation of the remai...

Embodiment 3

[0059] Extract and neutralize the secondary mother liquor of L-gulonic acid first: the secondary mother liquor of L-gulonic acid contains about 40% gulonic acid; add 1 / 2 volume of propanol to the mother liquor of gulonic acid , then stirring and dropping 40% NaOH solution, cooling with cold water during the dropping process, when the pH value of the inner liquid reaches 5.0, control the inner temperature of the reaction device at 42° C., and react for 5 hours. Then cool down to room temperature 20°C, cool down to 2°C with ice-salt water, centrifuge, collect solids and dry them to recover gulonic acid.

[0060] Concentrate under reduced pressure the dilute solution from which most of the gulonic acid has been extracted, steam the propanol and part of the water from the mother liquor, and stop heating and cool down when the concentration of the inner liquid reaches 40%. The steamed propanol aqueous solution is sent to the propanol recovery tower for recovery.

[0061] Oxidation...

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Abstract

The invention provides a treatment method of L-gulonic acid secondary mother liquor, which is characterized in that most of gulonic acid is firstly extracted from L-gulonic acid secondary mother liquor, useful ingredients are sufficiently utilized, and wastewater treatment amount is reduced. The invention provides a beneficial comprehensive treatment of high-concentration organic wastewater. In the treatment method, gulonic acid mother liquor is oxidized into oxalic acid, oxalic acid mother liquor can be repeatedly used, the pollution of waste mother liquor to a water body is completely eliminated, the tail gas generated during the treatment process is absorbed in the way of closed circulation, and the pollution to atmosphere is eliminated.

Description

technical field [0001] The invention relates to the technical field of gulong acid recovery, in particular to a treatment method for secondary mother liquor of L-gulonic acid. Background technique [0002] L-gulonic acid is an important raw material for the production of VC. At present, the production of VC products at home and abroad generally adopts the secondary fermentation method. After the primary mother liquor of gulonic acid prepared by this method is extracted once again, the remaining substance is the secondary mother liquor of L-gulonic acid. This mother liquor is brownish black mucus, and the COD value and BOD value seriously exceed the standard and cannot be discharged directly. The traditional biochemical method Treatment of waste mother liquor, not only the cost of wastewater treatment is high, but also the effluent cannot meet the national discharge standards. [0003] In the prior art, the secondary mother liquor of L-gulonic acid is directly treated with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/105C07C51/48C07C55/06C07C51/27
Inventor 米超杰宋道淮
Owner 山东润鑫投资有限公司