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Method for recovering nicotinic acid in industrial wastewater

A technology of industrial waste water and recovery method, applied in the direction of organic chemistry, etc., can solve the problems of harsh production conditions, high cost of waste water treatment, low quality of nicotinic acid, etc., and achieve the goal of reducing the loss of nicotinic acid, improving the color and luster, and improving the safety Effect

Pending Publication Date: 2022-05-10
ANHUI RUIBANG BIOLOGICAL SCI & TECH CO LTD
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Problems solved by technology

[0005] For the problems of complex process and harsh production conditions in the prior art, the purpose of this method is to provide a recovery method for nicotinic acid in industrial wastewater, which solves the problem of complex process conditions in the prior art, low quality of recovered nicotinic acid and low recovery rate. Not high, wastewater treatment costs are too high, etc.

Method used

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  • Method for recovering nicotinic acid in industrial wastewater
  • Method for recovering nicotinic acid in industrial wastewater
  • Method for recovering nicotinic acid in industrial wastewater

Examples

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Embodiment 1

[0029] a. First, put 10L of niacin wastewater in a reaction kettle, heat it under vacuum and concentrate until the niacin content reaches 200g / L.

[0030] b. Take 150g of concentrated waste water and directly acidify to pH 3.7, directly add activated carbon of 5% of the total mass of concentrated niacin, add 360g of purified water to dissolve, mix well, heat and boil for 30min.

[0031] c. Suction filtration while hot to obtain filtrate.

[0032] d. The filtrate was allowed to stand at room temperature, and then filtered with suction.

[0033] e. Wash the filter cake of the above step d twice with water, and the amount of water is 4 times of that of the filter cake to obtain the wet product E1.

[0034] f. The wet product E1 obtained from the above step e was vacuum-dried (90°C, -0.09mpa) to obtain high-purity nicotinic acid finished product E2: 18.2g.

[0035] as table 1 and figure 1 As shown, in this embodiment, high-purity niacin with a niacin content of 99.73% was final...

Embodiment 2

[0039] a. First, put 10L of nicotinic acid waste water in a reaction kettle, vacuumize and heat to concentrate to a nicotinic acid content of 120g / L.

[0040] b. Take 150g of concentrated waste water and directly acidify to pH 3.7, directly add 5% activated carbon of the total mass of concentrated niacin, add 300g of purified water to dissolve, mix well, heat and boil for 30min.

[0041] c. Suction filtration while hot to obtain filtrate.

[0042] d. The filtrate was allowed to stand at room temperature, and then filtered with suction.

[0043] e. Wash the filter cake of the above step d twice with water, and the amount of water is 4 times of that of the filter cake to obtain the wet product E1.

[0044] f. The wet product E1 was obtained from the above step e, and then vacuum-dried (90°C, -0.09mpa) to obtain high-purity nicotinic acid finished product E2: 11.3g.

[0045] as table 2 and figure 2 As shown, in this embodiment, high-purity niacin with a niacin content of 99.6...

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Abstract

The invention discloses a method for recovering nicotinic acid in industrial wastewater, which comprises the following steps: concentrating nicotinic acid wastewater until the content of nicotinic acid is 100-250g / L, directly adjusting the pH value to 3.0-4.0, directly adding activated carbon, adding a certain amount of solvent for dissolving, heating and boiling, carrying out suction filtration while hot, standing the filtrate to room temperature, carrying out suction filtration again on the filtrate, washing the filter cake with water to obtain a wet product, and carrying out vacuum drying at 70-100 DEG C under-0.08 mpa-0. 10 mpa to obtain the nicotinic acid. The high-purity nicotinic acid is obtained. The method provided by the invention solves the problems of complex process conditions, low quality of recovered nicotinic acid, low recovery rate, too high wastewater treatment cost and the like in the prior art.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for recovering niacin in industrial waste water. Background technique [0002] At present, the recovery methods of niacin in niacin wastewater in the prior art mainly include concentration method, resin adsorption method, membrane treatment method, metal ion complexation method and biochemical treatment method, among which the more important methods are: [0003] Method 1: Take ammonia water and waste water containing 3-cyanopyridine respectively, the molar ratio of 3-cyanopyridine to ammonia water in the waste water is 1:2-8; pour the waste water and ammonia water into the reactor and react under gentle pressure for 1 ~6 hours; then concentrate the reaction solution under reduced pressure to a dry solid; add water to wash the dry solid and then dry it, and recycle the filtered aqueous solution; the dried solid is sublimated at a temperature of ...

Claims

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Application Information

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IPC IPC(8): C07D213/803C07D213/80
CPCC07D213/803C07D213/80
Inventor 李玉山杨竞成史玉龙金如昌夏伟
Owner ANHUI RUIBANG BIOLOGICAL SCI & TECH CO LTD
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