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A kind of crystallization tower equipment of lower melting point substance

A technology of crystallization equipment and crystallization tower, which is applied in the direction of solution crystallization, can solve the problems of crystal discharge, large amount of solvent, limited heat exchange area, etc., and achieve the effects of increasing fluidity, increasing content, and reducing solvent consumption

Active Publication Date: 2015-10-28
SHANDONG KEXIN BIOCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing crystallization equipment is mainly cooled in a crystallization tank or a crystallization kettle, and the heat exchange area is limited; Control it at 0.25-0.30:1. If it is greater than this ratio, it will be difficult for crystals to be discharged from the crystallization equipment, so the amount of solvent required in the crystallization process is relatively large, and the crystallization solvent must be post-treated before it can be recycled; if the crystallization mother liquor The ratio of the volume occupied by the solid to the volume occupied by the liquid in the medium is adjusted to be greater than 0.30:1, and the current crystallization equipment cannot meet the requirements

Method used

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  • A kind of crystallization tower equipment of lower melting point substance
  • A kind of crystallization tower equipment of lower melting point substance

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: the refining of 2-chloro-5-chloromethylthiazole

[0025] Gradient temperature control of the crystallization tray of the equipment: the temperature of the convex part B of the crystallization tray is controlled at 28-30 °C, and the temperature of the concave part A of the tray is controlled at 3-5 °C.

[0026] Add 20kg of dichloromethane to 180kg of 2-chloro-5-chloromethylthiazole (content 90-94%), control the temperature at 35°C, and enter the crystallization from the mother liquor feed port 2 through the material distributor at a flow rate of 50kg / h In the tower body 1, after adding the materials; the crystallization tray 4 starts to heat up slowly to 20-23°C, and maintains it for a certain period of time, so that the molten material drops; the nitrogen gas with a certain flow rate is introduced from the nitrogen inlet 3, and then the crystallization tray 4 The temperature is raised to 28°C and kept for a period of time. The material adhering to the c...

Embodiment 2

[0027] The refining of embodiment 2 chlorpyrifos

[0028] Gradient temperature control of the crystallization tray of the equipment: the temperature of the convex part of the crystallization tray is controlled at 41-43°C, and the temperature of the concave part of the tray is controlled at 0-5°C.

[0029] Add 20kg of dichloroethane to 150kg of chlorpyrifos (90-95%), control the temperature at 48-50°C, enter the crystallization tower body 1 from the mother liquor feed port 2 through the material distributor at a flow rate of 50kg / h, add After the material is finished; the crystallization tray 4 begins to heat up slowly to 36-38°C, and keeps it for a certain period of time, so that the molten material drops; the nitrogen gas with a certain flow rate is introduced from the nitrogen inlet 3, and kept for a period of time, the material adhering to the crystal surface It is blown off by nitrogen and enters the solvent recovery tank. Because chlorpyrifos has a mercaptan odor, the...

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Abstract

The invention relates to crystallization tower equipment suitable for a lower-melting-point substance, which comprises a crystallization tower body (1), a mother solution inlet (2), a nitrogen inlet (3), crystallization tower plates (4) in concave sandwich structures, and a material outlet (5), wherein the mother solution inlet (2) and the nitrogen inlet (3) are located above all the crystallization tower plates (4), and the material outlet (5) is located below all the crystallization tower plates (4). The crystallization tower equipment is characterized in that the crystallization tower plates (4) in the concave sandwich structures comprise concave parts (A) and convex parts (B) which surround the concave parts (A) and are upwards relative to the concave parts (A), and the concave parts (A) are provided with through holes (E) perpendicularly penetrating through the concave parts (A). The crystallization tower equipment has the advantages that a ratio of the volume occupied by solid to the volume occupied by liquid in the finally crystallized mother solution can be greater than 0.30:1, and can reach 0.90:1 at most; consumption of a solvent is reduced; and the cost is saved.

Description

technical field [0001] The invention relates to the field of chemical equipment, in particular to a crystallization equipment for a crystallization process. Background technique [0002] The crystallization process is a very economical physical process for improving the purity of solid products. Existing crystallization equipment is mainly cooled in a crystallization tank or a crystallization kettle, and the heat exchange area is limited; Control it at 0.25-0.30:1. If it is greater than this ratio, it will be difficult for crystals to be discharged from the crystallization equipment, so the amount of solvent required in the crystallization process is relatively large, and the crystallization solvent must be post-treated before it can be recycled; if the crystallization mother liquor The ratio of the volume occupied by the solid to the volume occupied by the liquid in the medium is adjusted to be greater than 0.30:1, which cannot be satisfied by the current crystallizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02
Inventor 左伯军李磊李德军李旭坤刘伟华侯波童佩剑马新刚程圆杰申宝玉
Owner SHANDONG KEXIN BIOCHEM
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