A method for returning small crystal particles in the slurry discharged from a reaction crystallizer

A technology of reaction crystallization and crystallization, applied in chemical instruments and methods, chemical/physical/physicochemical fixed reactors, crystallization and separation, etc., can solve the problems of difficult continuous operation, increase of pre-order operation load and cost, and increase of fine powder content To achieve the effect of ensuring product purity, avoiding crushing, and reducing fine powder content

Active Publication Date: 2021-10-19
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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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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  • A method for returning small crystal particles in the slurry discharged from a reaction crystallizer
  • A method for returning small crystal particles in the slurry discharged from a reaction crystallizer

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Effect test

Embodiment approach 1

[0018] Attached below figure 1 The inventive method is described further:

[0019] see figure 1 , the reaction crystallizer 1 is continuously fed and discharged, the slurry in it enters the slurry storage tank 2 through overflow, and the good liquid-solid mixing in the slurry storage tank 2 can be maintained by proper mechanical stirring, and the crystal particles will not significantly settle. The clear liquid circulation pump 4 extracts most of the supernatant liquid in the settling reflux tank 7 and sends it into the Venturi tube 3 as the carrier fluid. Under the action of negative pressure, the slurry in the slurry storage tank 2 will be sucked into the Venturi tube 3, and mixed and diluted with the clear liquid from the clear liquid circulation pump 4. The diluted slurry flowing out of the Venturi tube 3 enters the hydrocyclone 5, where the continuous separation of larger crystal particles and smaller crystal particles is realized, and the larger crystal particles and a...

Embodiment approach 2

[0021] Attached below figure 2 The inventive method is described further:

[0022] see figure 2 , the reaction crystallizer 1 is continuously fed and intermittently discharged, and the slurry is discharged intermittently through the discharge valve at the bottom and enters the slurry storage tank 2. Good liquid-solid mixing in the slurry storage tank 2 can be maintained by proper mechanical stirring, and the crystal Particles do not settle significantly. The clear liquid circulation pump 4 extracts most of the supernatant liquid in the settling reflux tank 7 and sends it into the Venturi tube 3 as the carrier fluid. Under the action of negative pressure, the slurry in the slurry storage tank 2 will be automatically sucked into the Venturi tube 3, mixed with the clear liquid from the clear liquid circulation pump 4, and diluted. The diluted slurry flowing out of the Venturi tube 3 enters the hydrocyclone 5, where the continuous separation of larger crystal particles and sm...

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Abstract

The invention discloses a method for returning small crystal particles in the slurry discharged from a reaction crystallizer. The method includes the following steps: (1) The slurry discharged from the reaction crystallizer first enters a slurry storage tank, and then is sucked out by a venturi tube and fed from The clear liquid of the clear liquid circulation pump is mixed and diluted; (2) The diluted slurry enters the hydrocyclone for continuous separation of large and small crystal particles, and the large particles and a small part of the clear liquid are taken out as underflow and enter the product storage tank, and the small particles and Most of the clear liquid is discharged into the settling reflux tank as the top flow; (3) In the settling reflux tank, small crystal particles settle down and return to the reaction crystallizer to continue to grow; (4) Most of the supernatant in the settling reflux tank The liquid is pumped out by the clear liquid circulating pump as carrier fluid and diluent, and a small part goes to the water treatment unit. The method has low equipment investment, is easy to realize continuous operation, can effectively improve the particle size distribution of the product, and can simultaneously improve the utilization efficiency of the raw material liquid and avoid environmental pollution.

Description

technical field [0001] The invention relates to the field of reaction crystallizers, in particular to a technical proposal for returning small crystal particles in slurry discharged from a reaction crystallizer. Background technique [0002] For the continuous or semi-continuous operation of the reaction crystallizer, the output slurry often contains mature large crystal particles and immature small crystal particles at the same time. 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. Furthermore, 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 liq...

Claims

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Application Information

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Patent Type & Authority Patents(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
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