A method and device for preparing sodium acetate from acetic acid wastewater

A technology of sodium acetate and waste water, applied in the directions of carboxylate preparation, carboxylate preparation, separation method, etc., can solve problems such as the need to purchase acetic acid raw materials, and achieve the effects of being beneficial to comprehensive utilization, reducing steam consumption, and reducing heating burden

Active Publication Date: 2021-02-23
无锡阳山生化有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industrial production, this principle is generally used to produce sodium acetate, but the acetic acid raw material needs to be purchased

Method used

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  • A method and device for preparing sodium acetate from acetic acid wastewater
  • A method and device for preparing sodium acetate from acetic acid wastewater
  • A method and device for preparing sodium acetate from acetic acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] refer to image 3 , an energy-saving preparation system for preparing sodium acetate, comprising a bag filter, a neutralization reactor 1, a filter 2, a concentration reactor 3, a crystallization tank 4 and a separator 5 connected in sequence, and the communication pipelines between the above components are all set The delivery pump, that is, the acetic acid wastewater enters the neutralization reactor 1 after being filtered by the cloth bag filter, and caustic soda is added dropwise in the neutralization reactor 1 to enter the neutralization reaction, and the reacted reaction liquid passes through the filter 2 to filter impurities and then enters the concentration reactor In 3, the concentrated mother liquor after concentration enters crystallization tank 4 to carry out crystallization, and the mixed solution after crystallization completes enters separator 5, and separator 5 separates crystal and mother liquor, and the liquid outlet of pump described separator 5 and cr...

Embodiment 2

[0070] refer to figure 1 with figure 2, a preparation method of sodium acetate, is characterized in that, comprises the following steps:

[0071] S1: Filter the acetic acid wastewater to remove impurities in the acetic acid wastewater, and use a cloth bag filter as the filter;

[0072] S2: neutralize the filtered acetic acid wastewater and caustic soda, measure the content of acetic acid in the acetic acid wastewater, determine the quality of caustic soda, and control the temperature of the neutralization reaction at 60°C. The specific process is that caustic soda is slowly added dropwise to the acetic acid wastewater, which can fully react the relatively high-cost caustic soda, and at the same time avoid the occurrence of side reactions caused by excessive caustic soda; after the dropwise addition, keep the acetic acid wastewater The mass of acetic acid is 5% more than that of caustic soda.

[0073] S3: when the pH value of the reaction liquid of the neutralization reacti...

Embodiment 3

[0079] refer to figure 1 with figure 2 , a preparation method of sodium acetate, is characterized in that, comprises the following steps:

[0080] S1: Filter the acetic acid wastewater to remove impurities in the acetic acid wastewater, and use a cloth bag filter as the filter;

[0081] S2: neutralize the filtered acetic acid wastewater and caustic soda, measure the content of acetic acid in the acetic acid wastewater, determine the quality of caustic soda, and control the temperature of the neutralization reaction at 52°C. The specific process is that caustic soda is slowly added dropwise to the acetic acid wastewater, which can fully react the relatively high-cost caustic soda, and at the same time avoid the occurrence of side reactions caused by excessive caustic soda; after the dropwise addition, keep the acetic acid wastewater The mass of acetic acid is 6% more than that of caustic soda.

[0082] S3: when the pH value of the reaction liquid of the neutralization react...

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Abstract

The invention discloses a method and a device for preparing sodium acetate by using acetic acid wastewater, wherein the method for preparing sodium acetate by using acetic acid wastewater comprises the following steps: filtering the acetic acid wastewater; neutralizing the filtered acetic acid wastewater and caustic soda; The product after the neutralization reaction is filtered to obtain a filtrate; the filtrate is evaporated and concentrated to obtain a concentrated mother liquor; the concentrated mother liquor is crystallized, and the crystal and the mother liquor are separated by a centrifuge to obtain sodium acetate crystals, the acetic acid in the present invention What the raw material of sodium preparation method uses is acetic acid waste water, and product raw material cost is low, and technical process is simple, so product cost is low, and has reduced the discharge of acetic acid waste water, has good economic value and social value; Sodium acetate preparation device among the present invention In the process, the exothermic and endothermic processes in each process are comprehensively utilized, and the water is preheated and precooled, which is beneficial to the comprehensive utilization of energy and saves preparation energy.

Description

technical field [0001] The invention relates to the technical field of sodium acetate production, in particular to a method and a device for preparing sodium acetate from acetic acid wastewater. Background technique [0002] In the production of glacial acetic acid, due to distillation and concentration in the refining process of acetic acid, a certain amount of acetic acid wastewater will be produced. The substances contained in acetic acid wastewater mainly include acetic acid, formic acid, acetaldehyde, miscellaneous fats and other substances. Generally, the total acid content in acetic acid wastewater is about 33% (of which the acetic acid content is about 30%, and the formic acid content is about 30%. 3%), there is also acetaldehyde, miscellaneous fat and other organic impurities, and water accounts for about 66%. In most glacial acetic acid production plants, acetic acid wastewater is discharged directly as one of the three industrial wastes. As a result, the pH valu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C51/43C07C53/10B01J19/18B01J19/00B01D1/22B01D9/02B01F13/10
CPCC07C51/412C07C51/43B01J19/0053B01J19/0086B01J19/18B01D1/225B01D9/0013B01J2219/00092B01F33/831C07C53/10
Inventor 蒋其明钱春龙李爱红
Owner 无锡阳山生化有限责任公司
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