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Static crystallizer and static crystallization method

A static crystallization and crystallization technology, applied in chemical instruments and methods, crystallization separation, separation methods, etc., can solve problems such as uneven thickness of the crystallization layer in the crystallization tube, affecting product purity and yield, crystallization tube falling off, etc., to avoid Reduced heat transfer efficiency, shortened separation cycle, and increased compactness

Active Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The inventors of the present invention found in the research process that the problems of low product purity and low yield during the static crystallization process are as follows: 1. The crystals are easy to fall off from the inner wall of the crystallization tube during the sweating process, which affects the sweating effect, and then affects the product purity. and yield; 2. In the existing static crystallizer, the temperature difference of the refrigerant from the inlet to the outlet is large, which will lead to uneven thickness of the crystallization layer in the crystallization tube

Method used

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  • Static crystallizer and static crystallization method

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Embodiment approach

[0098] According to a preferred embodiment provided by the present invention, the static crystallization method includes:

[0099](1) The first heat exchange medium is respectively introduced into the N-layer sub-cavities, and the material to be crystallized is cooled and crystallized in a static crystallizer, and the cavity 2 of the static crystallizer is provided with a crystallization chamber for the material to be crystallized At least one heat exchange tube 11, the heat exchange tube 11 is provided with a stretchable component 3, and the stretchable direction of the stretchable component 3 is not parallel to the axial direction of the heat exchange tube 11;

[0100] (2) introducing the second heat exchange medium into the N-layer subcavities respectively, heating and sweating the first crystal layer obtained in step (1), and discharging the obtained sweat out of the static crystallizer;

[0101] (3) heating and melting the second crystal layer obtained in step (2).

[01...

Embodiment 1

[0106] In the static crystallizer used in this embodiment, the cavity 2 is not layered, the height H of the cavity 2 is 1 m, and the inner diameter is 0.2 m. Three heat exchange tubes 11 are arranged in the cavity 2; the sum of the cross-sectional areas of the heat exchange tubes 11 accounts for 65% of the cross-sectional area of ​​the cavity 2, and each heat exchange tube 11 is provided with There are three layers of stretchable parts 3 (spiral shape) arranged up and down, the porosity of the heat exchange tube is 85%, and the stretchable parts 3 are arranged horizontally, and the stretchable direction is the same as the heat exchange tube. The axial direction of the tube 11 is vertical, and the end surface of the stretchable part 3 in the stretchable direction is in direct contact with the heat exchange surface of the heat exchange tube 11, and the end of the stretchable part 3 in the heat exchange tube The covering area of ​​the part accounts for 80% of the area of ​​the he...

Embodiment 2

[0114] In the static crystallizer that present embodiment adopts, as figure 1 As shown, the cavity 2 is divided into two layers (i.e. N=2) sub-cavities, which are respectively denoted as the upper layer sub-cavity 2-2 and the lower layer sub-cavity 2-1, and the upper layer sub-cavity 2-2 There are an upper layer heat exchange medium inlet 6-2 and an upper layer heat exchange medium outlet 7-2, the upper layer heat exchange medium inlet 6-2 is located below the upper layer heat exchange medium outlet 7-2; the lower layer subcavity 2 -1 is provided with a lower heat exchange medium inlet 6-1 and a lower heat exchange medium outlet 7-1, and the lower heat exchange medium inlet 6-1 is located below the lower heat exchange medium outlet 7-1. The height of each sub-cavity is 0.5 meters, and the inner diameter of the cavity 2 is 0.5 meters. Seven heat exchange tubes 11 are arranged in the cavity 2; the sum of the cross-sectional areas of the heat exchange tubes 11 accounts for 85% o...

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Abstract

The invention relates to the technical field of static crystallization, and particularly discloses a static crystallizer and a static crystallization method. The static crystallizer comprises a shell and a cavity formed in the shell, wherein at least one heat exchange pipe is arranged in the cavity, telescopic parts are arranged in the heat exchange pipes, and the telescopic direction of the telescopic part is not parallel to the axial direction of the heat exchange pipe. The method is carried out in the specific static crystallizer, so the heat exchange efficiency of a static crystallization process can be remarkably improved, the uniformity of crystallization and sweating processes is ensured, a high-purity and high-yield crystallization product is obtained, and the energy consumption of the crystallization process can be further reduced; and the method can be applied to industrial production of static crystallization, especially to purification and separation of high-end fine chemicals or high-added-value products with high purity requirements.

Description

technical field [0001] The invention relates to the technical field of static crystallization, in particular to a static crystallizer and a static crystallization method. Background technique [0002] In recent years, with the continuous development of electric vehicles, materials, chemicals, food, medicine and other industries, the purity requirements of related products are getting higher and higher, especially for some high-end fine chemicals or high value-added products, the product quality requirements are getting higher and higher. for strict. [0003] As an important unit operation in chemical, food, pharmaceutical and other industries, crystallization is widely used in the separation and purification of components. It is separated and purified by using the melting point difference of different components. Compared with the rectification method, the crystallization method has high safety and low energy consumption, and can also effectively separate isomers and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/00
CPCB01D9/0013B01D9/0063
Inventor 郭艳姿陈亮蔡立鑫
Owner CHINA PETROLEUM & CHEM CORP
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