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Method for returning small crystal particles in discharged slurry of reaction crystallizer

A technology for reactive crystallization and crystallization, applied in chemical instruments and methods, chemical/physical/physical-chemical stationary reactors, solution crystallization, etc., can solve the problem of difficult continuous operation, increase the content of fine powder, increase the load and cost of pre-sequence operation and other problems, to avoid crushing, reduce fine powder content, and reduce production costs.

Active Publication Date: 2020-04-24
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following disadvantages: (1) The separation of large and small crystal particles is carried out after filtration, washing and drying, which greatly increases the load and cost of the previous operation, because the final small crystal particles must be added with water to form a slurry (2) Liquid-solid separation is not easy to achieve continuous operation by means of filtration; (3) Mechanical transportation equipment will be used in the process of slurry transportation, which may break large crystal particles and increase the concentration of fine powder. content
[0004] Therefore, so far, there is still no energy-saving, environmentally friendly, and efficient method that can separate the small crystal particles in the slurry discharged from the reaction crystallizer and return them to the reaction crystallizer to continue growing.

Method used

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  • Method for returning small crystal particles in discharged slurry of reaction crystallizer
  • Method for returning small crystal particles in discharged slurry of reaction crystallizer

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Embodiment approach 1

[0018] Attached below figure 1 The method of the present invention is further described:

[0019] see figure 1 , the reaction crystallizer 1 is continuously fed and discharged, and the slurry in it enters the slurry storage tank 2 through overflow, and good liquid-solid mixing in the slurry storage tank 2 can be maintained by appropriate mechanical stirring, and the crystal particles will not be significantly settled. The supernatant liquid in the sedimentation reflux tank 7 is drawn out by the supernatant liquid circulating pump 4 and sent into the venturi tube 3 as the carrier fluid. The fast-flowing supernatant liquid in the venturi tube 3 in the working state will generate negative pressure, and in this Under the action of negative pressure, the slurry in the slurry storage tank 2 will be sucked into the venturi tube 3, mixed and diluted with the clear liquid from the clear liquid circulating pump 4. The diluted slurry flowing out of the venturi 3 enters the hydrocyclone...

Embodiment approach 2

[0021] Attached below figure 2 The method of the present invention is further described:

[0022] see figure 2 , the reaction crystallizer 1 is continuously fed and intermittently discharged, and the slurry is intermittently discharged through the discharge valve at the bottom and enters the slurry storage tank 2. Through proper mechanical stirring, a good liquid-solid mixing in the slurry storage tank 2 can be maintained, and the crystal Particles do not settle significantly. The supernatant liquid in the sedimentation reflux tank 7 is drawn out by the supernatant liquid circulating pump 4 and sent into the venturi tube 3 as the carrier fluid. The fast-flowing supernatant liquid in the venturi tube 3 in the working state will generate negative pressure, and in this Under the action of negative pressure, the slurry in the slurry storage tank 2 will be automatically sucked into the venturi tube 3, mixed and diluted with the clear liquid from the clear liquid circulating pum...

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Abstract

The invention discloses a method for returning small crystal particles in discharged slurry of a reaction crystallizer, which comprises the following steps: (1) the discharged slurry of the reaction crystallizer firstly enters a slurry storage tank and then is sucked out by a venturi tube to be mixed and diluted with clear liquid from a clear liquid circulating pump; (2) the diluted slurry entersa hydrocyclone for continuous separation of large and small crystal particles, large particles and a small part of clear liquid are taken as underflow to be extracted and enter a product storage tank,and small particles and a large part of clear liquid are taken as top flow to be discharged and enter a settling reflux tank; (3) the small crystal particles are settled in a settling reflux tank, and the small crystal particles are refluxed into the reaction crystallizer for continuous growth; and (4) most of the supernatant in the settling reflux tank is pumped out by a clear liquid circulatingpump to serve as a carrier and a diluent, and a small part enters a water treatment unit. The method has the advantages of small equipment investment, easy realization of continuous operation, effective improvement of the particle size distribution of the product, improvement of the utilization efficiency of the raw material liquid, and avoiding of environmental pollution.

Description

technical field [0001] The invention relates to the field of reaction crystallizers, in particular to a technical scheme for returning small crystal particles in the discharge slurry of the reaction crystallizer. Background technique [0002] For continuous or semi-continuously operated reactive crystallizers, the effluent slurry often contains both mature large crystal particles and immature small crystal particles. The presence of these small crystal particles will affect the particle size distribution of the product and reduce the quality of the product. If these immature small crystal particles can be separated from the slurry, the particle size distribution of the product can be effectively improved and the quality of the product can be improved. Further, if these separated small crystal particles can be returned to the reaction crystallizer to continue to grow into mature large crystal particles, the utilization efficiency of the raw material liquid can be significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18B01D9/02
CPCB01D9/0077B01D2009/0086B01J19/18
Inventor 朱全红黄青山肖航杨超
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI