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Crystal size controllable continuous crystallization process of sodium acetate trihydrate

A sodium acetate trihydrate, crystal size technology, applied in sustainable manufacturing/processing, climate sustainability, chemical industry, etc., can solve problems such as uncontrollable product particle size, low production efficiency, and reduced cooling efficiency, and achieve a solution Reduced cooling efficiency, high production efficiency, and low energy consumption

Active Publication Date: 2014-01-08
ZHEJIANG JINKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of sodium acetate trihydrate continuous crystallization process with controllable crystal size, aiming to solve the low production efficiency of sodium acetate trihydrate intermittent crystallization in the prior art, the easy wall sticking in the crystallization process leads to the reduction of cooling efficiency and the product Particle Size Uncontrollable Problems

Method used

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  • Crystal size controllable continuous crystallization process of sodium acetate trihydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Control the opening of the valve 14, and the flow rate of 1 t / h of sodium acetate trihydrate at 60° C. in molten state enters the receiving kettle 1 . Control the opening of the valve 16, and the mother liquor 4t / h enters the receiving tank 1. The temperature of the slurry in the receiving kettle is 45° C., and the weight percent of sodium acetate trihydrate crystals is 20%. Control the temperature difference between the cooling water and the slurry in the crystallization heat exchanger 2A to be 5°C, that is, the temperature of the cooling water is 40°C. The flow rate of the slurry is controlled to be 5 t / h into the crystal growth kettle 5, and the residence time in the kettle is 0.5 hour. The slurry in the kettle 5 flows into the centrifuge 6 by gravity, and the centrifuged solid is the product, and the particle size of the product sodium acetate is 0.4~0.5mm. , the mother liquor enters the mother liquor transfer tank 15 for recycling.

[0023] The continuous workin...

Embodiment 2

[0025] Control the opening degree of valve 14, and the flow rate of 1 t / h of sodium acetate trihydrate in molten state at 75° C. enters receiving kettle 1 . Control the opening of the valve 16, and the mother liquor 1t / h enters the receiving tank 1. The temperature of the slurry in the receiving kettle is 45° C., and the weight percent of sodium acetate trihydrate crystals is 50%. Control the temperature difference between the cooling water and the slurry in the crystallization heat exchanger 2A to be 10°C, that is, the temperature of the cooling water is 35°C. The flow rate of the slurry is controlled to be 2t / h into the crystal growth tank 5, and the residence time in the tank is 5 hours. The slurry in the kettle 5 flows into the centrifuge 6 by gravity, and the centrifuged solid is the product, and the particle size of the product sodium acetate is 0.8~1.0mm. The mother liquor enters the mother liquor tank for recycling.

[0026] The continuous working time of the heat e...

Embodiment 3

[0028] Control the opening degree of valve 14, and the flow rate of 1 t / h of sodium acetate trihydrate in molten state at 65° C. enters receiving kettle 1 . Control the opening of the valve 16, and the mother liquor 9t / h enters the receiving tank 1. The temperature of the slurry in the receiving kettle is 35° C., and the weight percent of sodium acetate trihydrate crystals is 10%. Control the temperature difference between the cooling water and the slurry in the crystallization heat exchanger 2A to be 1°C, that is, the temperature of the cooling water is 34°C. The flow rate of the slurry is controlled to be 10t / h into the crystal growth kettle 5, and the residence time in the kettle is 0.5 hour. The slurry in the kettle 5 flows into the centrifuge 6 by gravity, and the centrifuged solid is the product, and the particle size of the product sodium acetate is 0.4~0.5mm. Mother liquor enters mother liquor transfer tank 15 for recycling.

[0029] The continuous working time of h...

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Abstract

The invention discloses a crystal size controllable continuous crystallization process of a sodium acetate trihydrate, which includes the steps that the sodium acetate trihydrate which is concentrated to a molten state and a saturated sodium acetate solution with a temperature of 35 DEG C to 45 DEG C are simultaneously and continuously added into a receiving kettle which contains slurries, the slurries in the receiving kettle enter a crystallization heat exchanger through a circulating pump to be cooled, temperature difference between cooling water and the slurries in the crystallization heat exchanger is controlled to be in the range from 0 DEG C to 10 DEG C, the slurries after being cooled enter a crystal growth kettle to stay for 0.5 to 5 hours, the slurries in the crystal growth kettle enter a centrifugal machine, after solid-liquid separation, a solid is packaged as a product of the sodium acetate trihydrate, a liquid serving as a mother liquor further enters a crystal receiving kettle, a standby heat exchanging cooling process is switched to be used when wall attachment in tubulation of the crystallization heat exchanger occurs, and the sodium acetate trihydrate which has wall attachment is eliminated in a fusion mode. The crystal size controllable continuous crystallization process of the sodium acetate trihydrate is high in production efficiency and low in energy consumption, crystallization of the sodium acetate trihydrate can be controlled, and the problem of reduced cooling efficiency caused by wall attachment easily generated in the crystallization process is solved.

Description

technical field [0001] The invention belongs to the technical field of sodium acetate trihydrate production, in particular to a continuous crystallization process of sodium acetate trihydrate with controllable crystal size. Background technique [0002] Sodium acetate trihydrate, also known as sodium acetate trihydrate, has the chemical formula CH 3 COONa·3H 2 O, molecular weight 136.06, white or colorless transparent crystal. Sodium acetate trihydrate is a good heat storage substance with a melting point of 58.4°C and a heat of fusion of 264kJ / kg. Sodium acetate trihydrate is easily soluble in water and slightly soluble in ethanol. It is a widely used chemical product. It can be used in printing and dyeing auxiliaries, organic synthesis industrial raw materials, civil heat storage materials and chemical reagents. Sodium acetate water can also be used as an auxiliary medical drug. In recent years, sodium acetate trihydrate has also been used as a road deicing agent in so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/10C07C51/43
CPCY02P20/10
Inventor 施孟华魏一帆宋盘龙陈永强张敏敏
Owner ZHEJIANG JINKE CHEM