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Method for separating water and calcium chloride through eutectic freezing crystallization

A technology of frozen crystallization and calcium chloride, which is applied in the direction of heat exchange cooling crystallization, solution crystallization, calcium/strontium/barium chloride, etc., can solve the problems of high energy consumption, difficult operation, and high operating cost of calcium chloride solids. Achieve the effect of easy operation, simple equipment, and reduced corrosion resistance

Active Publication Date: 2021-12-21
江西思远再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method to obtain calcium chloride solid by evaporation and crystallization has the disadvantages of high energy consumption, complicated process, high operating cost and difficult operation.

Method used

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  • Method for separating water and calcium chloride through eutectic freezing crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare 5L of an aqueous solution with a calcium chloride content of 20%, and use ice water as the cooling medium to pre-cool 5L of the calcium chloride solution to 5°C through a tube-and-tube heat exchanger, and pump the pre-cooled calcium chloride solution into the crystallizer , the crystallizer is stirred to 750rpm, and carbon dioxide is introduced from the bottom of the crystallizer to the inside of the crystallizer. After the pressure shows 1.22Mpa, the carbon dioxide gas is stopped, and the ethylene glycol refrigerant continues to cool down the calcium chloride solution through the jacket of the crystallizer. Stop pre-cooling when the internal temperature of the crystallizer drops to -29°C, at this time the CO 2 , The feed valve is closed.

[0033] Continue to maintain the pressure and temperature for 1.0 hour. It is observed that the salt crystallizes out first, and a carbon dioxide clathrate clathrate is formed on the upper layer of the crystallizer. When the p...

Embodiment 2

[0036] Prepare 5L of an aqueous solution with a calcium chloride content of 20%, and use ice water as the cooling medium to pre-cool 5L of the calcium chloride solution to 5°C through a tube-and-tube heat exchanger, and pump the pre-cooled calcium chloride solution into the crystallizer , the crystallizer is stirred to 750rpm, carbon dioxide is introduced from the bottom of the crystallizer to the inside of the crystallizer, and the pressure shows 1.06Mpa. Stop feeding carbon dioxide gas, and the ethylene glycol refrigerant continues to cool down the calcium chloride solution through the jacket of the crystallizer. Stop precooling when the temperature inside the crystallizer drops to -33°C, at this time the CO 2 , The feed valve is closed.

[0037] Continue to maintain the pressure and temperature for 1.0 hour. It is observed that the salt crystallizes out first, and a carbon dioxide clathrate clathrate is formed on the upper layer of the crystallizer. When the pressure is sli...

Embodiment 3

[0040] Prepare 5L of an aqueous solution with a calcium chloride content of 20%, and use ice water as the cooling medium to pre-cool 5L of the calcium chloride solution to 5°C through a tube-and-tube heat exchanger, and pump the pre-cooled calcium chloride solution into the crystallizer , the crystallizer is stirred to 750rpm, and carbon dioxide is introduced from the bottom of the crystallizer to the inside of the crystallizer. After the pressure shows 1.34Mpa, the carbon dioxide gas is stopped, and the ethylene glycol refrigerant continues to cool down the calcium chloride solution through the jacket of the crystallizer. Stop pre-cooling when the internal temperature of the crystallizer drops to -25°C, at this time the CO 2 , The feed valve is closed.

[0041] The pressure and temperature were maintained for an additional 1.0 hour. It is observed that the salt crystallizes out first, and a clathrate of carbon dioxide is formed on the upper layer of the crystallizer. When th...

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Abstract

The invention discloses a method for separating water and calcium chloride through eutectic freezing crystallization. The method comprises the following steps of (a) pre-cooling a calcium chloride solution in a heat exchanger, (b) pumping the pre-cooled calcium chloride solution into a crystallizer, introducing CO2 gas into the crystallizer, and then cooling the crystallizer through a refrigerant, (c) maintaining the pressure and the temperature in the crystallizer for a certain time to form calcium chloride solid and a carbon dioxide inclusion compound in the crystallizer, and (d) discharging the calcium chloride solid through a discharge port at the bottom of the crystallizer, and carrying out solid-liquid separation through a centrifugal machine to obtain calcium chloride and calcium chloride mother liquor. The method for separating water and calcium chloride through eutectic freezing crystallization is simple in process operation, energy-saving, environment-friendly, low in operation cost, free of secondary pollution, energy-saving and consumption-reducing.

Description

technical field [0001] The invention relates to the technical field of salt recovery, in particular to a method for separating water and calcium chloride through eutectic freeze crystallization. Background technique [0002] Calcium chloride is a chemical substance composed of chlorine and calcium elements with the chemical formula CaCl 2 , slightly bitter. It is a typical ionic halide, white, hard pieces or particles at room temperature. The uses of calcium chloride include preventing food spoilage, and it is commonly used as a food preservative. It also helps maintain food freshness. Pasteurized milk has a lot of calcium removed during processing, and a small amount of calcium chloride can be added to help coagulate. Calcium chloride solution can be used in refrigerators, it is an essential coolant. Due to its strong moisture-absorbing properties, it can be used to dry other organic liquids and is therefore sometimes used as a desiccant. The compound helps lower the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02C01F11/24
CPCB01D9/0013C01F11/24Y02P20/10
Inventor 董飘平蒋航宇刘宇豪王璐赵尹
Owner 江西思远再生资源有限公司
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