Direct heat exchange based cooling crystallization method

A direct technology of cooling crystallization, applied in the direction of heat exchange cooling crystallization, solution crystallization, etc., can solve the problem of easily causing crystals to stick to the wall, and achieve the effect of reducing labor intensity, avoiding wall hanging, and avoiding crystallization

Inactive Publication Date: 2019-08-30
陕西宏元化工技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cooling crystallization method with direct heat exchange for the existing cooling crystallization process which easily causes crystals to stick to the wall

Method used

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  • Direct heat exchange based cooling crystallization method

Examples

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Embodiment 1

[0014] see figure 2 , the present invention comprises the following steps:

[0015] Under normal pressure, the crystallization point of sodium sulfate is 12-15 ℃, with 1m 3 At the flow rate of / h, the saturated solution containing sodium sulfate at 30-35 °C is continuously pumped into the crystallizer 3 through the interface 1; then the circulation volume is 68m 3 The low-temperature toluene of 5°C / h is passed into the bottom of the crystallizer 3 through the connecting pipe 8, and the saturated sodium sulfate solution is mixed with the low-temperature toluene of 5°C from the bottom for countercurrent mixing and heat exchange, and the toluene is heated to 8-10°C. The heat released by the crystallization process of sodium sulfate is removed, and the sodium sulfate solution is kept at about 12-15 °C, and sodium sulfate decahydrate crystals are formed at the bottom of the crystallizer 3; The pass 4 is driven into the heat exchanger 10 by the circulating pump 7. After the heat ...

Embodiment 2

[0017] see image 3 , the present invention comprises the following steps:

[0018] Under the condition that there is no limit to the pressure, the crystallization point of sodium sulfate is 12-15 ℃, with 1m 3 At the flow rate of / h, the saturated aqueous solution containing sodium sulfate at 35°C is continuously pumped into the crystallizer 3 through the interface 2, and the crystallizer 3 is provided with a stirrer 9, so that the two liquids can be fully contacted; and the circulation volume is 75m 3 The low-temperature bromobenzene at 5°C per hour is passed into the upper part of the crystallizer 3 through the nozzle 4, and the sodium sulfate aqueous solution in the crystallizer 3 and the low-temperature bromobenzene at 5°C are mixed in countercurrent for heat exchange, and the bromobenzene takes away the crystallization of the sodium sulfate solution and releases The heat of sodium sulfate is precipitated in the crystallizer 3, and sinks into the bottom of the crystallize...

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Abstract

The invention relates to a direct heat exchange based cooling crystallization method. The method comprises steps as follows: an organic medium which is insoluble with a solute solution and has a freezing point lower than 5 DEG C and a boiling point higher than 30 DEG C is adopted as a heat transfer medium; the organic medium is cooled to be 1-4 DEG C lower than an aqueous inorganic salt solution,low-temperature organic medium countercurrent and a solution are contacted in a crystallizer for heat exchange, the low-temperature organic medium takes away heat released by crystallization, inorganic salt is separated out from the aqueous solution, the organic medium is sent to outside of the crystallizer and is recycled after being cooled again, and continuous cooling crystallization of the inorganic salt is realized. The method has the advantages of being high in heat exchange efficiency, low in equipment investment and high in operability, avoiding crystallizing blockage and reducing labor intensity, and is applicable to cooling crystallization of multiple materials.

Description

technical field [0001] The invention relates to a cooling crystallization method for direct heat exchange, which avoids the crystallization and attachment of crystallization products on the cooling interface during the solvent crystallization process in the production process of the chemical industry. Background technique [0002] Cooling crystallization is a commonly used process in the chemical industry, but in the process of cooling and crystallization, due to the heat conduction effect, crystals will always appear first on the cooling interface, and once the crystals are formed on the wall, the crystallization process will quickly reduce or terminate the medium Heat transfer will eventually form crystals without accumulation on the crystallographic interface, making the device fail. [0003] Many scholars have used the supersaturation degree of the crystallization process to control the heat transfer in the crystallization process through research in order to avoid the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02
CPCB01D9/0009
Inventor 史永军杨诺史秦博苑
Owner 陕西宏元化工技术有限公司
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