Method for preparing sodium acetate from acetic acid waste gas through alkaline absorption

A technology of alkali absorption and sodium acetate, applied in the directions of carboxylate preparation, carboxylate preparation, separation method, etc., can solve problems such as acetic acid waste gas pollution, achieve the effects of efficient production, simplified process and reduced production cost

Active Publication Date: 2014-03-26
HUBEI YITAI PHARMA
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Problems solved by technology

[0009] The purpose of the present invention is to improve the absorption and treatment method of acetic acid waste gas in view of the defects of acetic acid waste gas absorption and treatment in the production process of glucuronolact...

Method used

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  • Method for preparing sodium acetate from acetic acid waste gas through alkaline absorption

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preparation example

[0030] according to figure 1 According to the process of operation, 1000 liters of water and 200 kg of 96% sodium hydroxide are added to the first-level alkali absorption tower and the second-level alkali absorption tower respectively, heated to 55-60°C to dissolve, and the pump is circulated to absorb glucaldehyde The acetic acid waste gas transported from the lactone workshop is roughly shaken, and the alkali absorption temperature is controlled between 50-60°C. Use pH test paper to measure the pH value of the solution in the primary alkali absorption tower at any time. When the pH value is close to 10, add 96% hydrogen Sodium oxide, when the total amount of 96% sodium hydroxide added to the primary alkali absorption tower reaches 400 kg, when the pH value of the absorption liquid reaches 8-9, the absorption liquid is input into the crystallization kettle, crystallization is controlled at -5 ° C, and the filter is obtained Sodium acetate trihydrate. The crystallization filt...

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Abstract

The invention relates to a method for preparing sodium acetate from acetic acid waste gas through alkaline absorption. The method comprises the following steps: 1, inputting acetic acid waste gas to an alkaline absorption tower through an induced draft fan to carry out multistage circulated alkaline absorption, and emptying the absorbed air, wherein the acetic acid waste gas is generated in a chemical industry or drug production process; 2, controlling the alkaline absorption liquid temperature between 30 DEG C and 80 DEG C, and adding solid sodium hydroxide or sodium carbonate when the pH value is less than or equal to 10; 3, stopping adding alkaline when the concentration of the added sodium hydroxide or sodium carbonate is up to 25-50%, and inputting alkaline absorption liquid to a crystallization kettle when the pH value of the alkaline absorption liquid is up to 8-9; 4, cooling the alkaline absorption liquid to 10 DEG C below zero to 30 DEG C, and carrying out centrifugal swing filtration to obtain sodium acetate trihydrate, or drying at the temperature of 120-150 DEG C to prepare anhydrous sodium acetate; and 5, adding centrifuged mother liquid into the alkaline absorption tower to be recycled, adding a hydrogen dioxide solution or potassium permanganate solution to decolor after the mother liquid turns yellow, wherein the mother liquid can be recycled. No new waste water, waste gas and waste residue are generated, and the production process is clean, environment-friendly, energy-saving and efficient.

Description

technical field [0001] [0002] The invention relates to the field of three wastes treatment in pharmaceutical synthesis production, in particular to a recovery and treatment method of acetic acid waste gas in the production process of glucuronolactone and a process method for preparing sodium acetate from acetic acid waste gas. [0003] Background technique [0004] [0005] In the production process of glucuronolactone, acetic acid is used for the esterification reaction. When the material is centrifuged, a large amount of acetic acid gas is generated. The acetic acid gas has a strong pungent smell, which affects the production environment and the atmospheric environment. Simple water spraying is used for absorption in the early stage of production. , the absorption is not complete, and part of the acetic acid gas still enters the atmosphere, polluting the operating environment and the atmospheric environment, and must be thoroughly treated. [0006] Exhaust gas trea...

Claims

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Application Information

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IPC IPC(8): C07C53/10C07C51/41B01D53/78B01D53/72
CPCB01D53/72B01D53/78C07C51/412C07C53/10Y02P20/10
Inventor 郭良臣
Owner HUBEI YITAI PHARMA
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