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A rectification tower for reflux improved 2-cyanopyrazine

A cyanopyrazine and rectifying tower technology, which is applied in the directions of fractionation, distillation separation, distillation adjustment/control, etc., can solve the problems such as insufficient utilization of trays and reflux purification efficiency, and achieves improved purification effect and large coverage area of ​​flow distribution. , the effect of improving purification efficiency

Active Publication Date: 2020-10-16
新乡市巨晶化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a rectification tower for 2-cyanopyrazine with improved reflux to solve the problems of insufficient tray utilization and limited reflux purification efficiency in the reflux process of the existing sieve plate rectification tower

Method used

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  • A rectification tower for reflux improved 2-cyanopyrazine
  • A rectification tower for reflux improved 2-cyanopyrazine
  • A rectification tower for reflux improved 2-cyanopyrazine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A rectifying tower for reflux improved 2-cyanopyrazine, comprising a tower body 1, a production hole 2 arranged at the top of the tower body 1, several trays 9 arranged inside the tower body 1 and the tower body 1 Connected reflux system; the reflux system includes a production pipe 3 connected to the production hole 2, a heat exchanger 4 connected to the production pipe 3 and a reflux main pipe 5 connected to the heat exchanger 4; the tray 9 It includes a shell 19 with a hollow structure, several sieve holes 10 opened on the shell 19 and passing through the shell 19, and several spray holes 17 set on the bottom surface of the shell 19 without the sieve holes 10; the tower The side of the plate 9 is provided with a return auxiliary pipe 6 that communicates with the interior of the shell 19 and extends to the outside of the tower body 1; each of the return auxiliary pipes 6 communicates with the return main pipe 5 and is provided with an auxiliary pipe valve 7; Each of t...

Embodiment 2

[0043] Based on Embodiment 1, in order to facilitate the maintenance of the trays and improve the reusability of the trays, the following improvements are made: the sealing ring 13 and the housing 19 are fixedly connected by an interference fit. Compared with welding, the sealing ring 13 is fixed by interference fit. When fouling occurs inside the tray 9, the sealing ring 13 can be riveted out for corresponding treatment. The removal of the sealing ring 13 by means of riveting can ensure the structural integrity of the tray 9 to the greatest extent, and the sealing ring 13 can be reassembled after the maintenance is completed. In this way, the reusability of the tray 9 can be greatly improved, thereby greatly saving the use and maintenance costs of the tray 9 .

Embodiment 3

[0045] Based on Example 1, in order to speed up the injection speed of the rectified fraction and increase the distribution coverage area, the following improvements have been made: each of the spray holes 17 is provided with a valve body assembly; The fixed rod 11 at the top of the inner wall of the body 19, the spray valve plate 15 installed in the spray hole 17 and the spring 18 arranged between the fixed rod 11 and the spray valve plate 15; The holes 17 are in a sliding fit. By arranging the valve body assembly at the spray hole 17, its function is as follows: First, the internal pressure of the tray 9 can be further increased through the sealing effect of the valve body assembly, thereby enhancing the flow rate of the feed liquid when it is sprayed from the spray hole 17. spray state, so that it is easier to atomize after spraying, and then improve the initial mass transfer and heat transfer efficiency again; secondly, through the annular gap formed between the spray valv...

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Abstract

The invention relates to a refluxing improved rectifying tower for 2-cyanopyrazine. The refluxing improved rectifying tower comprises a tower body provided with an extraction hole, a plurality of pieces of tower plates and a refluxing system, wherein the refluxing system comprises an extraction pipe connected with the extraction hole, a heat exchanger connected with the extraction pipe and a refluxing main pipe connected with the heat exchanger; each tower plate comprises a hollow shell body, a plurality of sieve holes which are formed in the shell body and penetrate through the shell body, and a plurality of spraying holes which are formed in a non-sieve-hole region of the bottom surface of the shell body; a refluxing auxiliary pipe, which is communicated with the inner part of the shellbody and extends out of the tower body, is arranged on a side face of each tower plate; each refluxing auxiliary pipe is communicated with the refluxing main pipe and an auxiliary pipe valve is arranged on a pipe body; each sieve hole is internally provided with a sealing circular ring which is coaxial with the sieve hole and is fixedly connected with the shell body; a main pipe valve is arrangedat the tail end of the refluxing main pipe. According to the refluxing improved rectifying tower for the 2-cyanopyrazine, the characteristic that positions of the different tower plates correspond todifferent separation efficiency can be sufficiently utilized, so that the purification effect of single-time refluxing is remarkably improved and the refluxing time needed for reaching the effect is effectively shortened, and furthermore, the whole efficiency of refluxing operation is greatly improved.

Description

technical field [0001] The invention relates to the field of rectification equipment, in particular to a rectification tower for 2-cyanopyrazine with improved reflux. Background technique [0002] 2-cyanopyrazine is an important chemical raw material and intermediate, which has a wide range of uses in the fields of spices and medicine. Especially in medicine, 2-cyanopyrazine can prepare anti-tuberculosis drug pyrazinamide. Among them, regarding its preparation method, Tianjin University discloses that propylene glycol and ethylenediamine are used as raw materials to obtain 2-cyanopyrazine through two reactions; Shanghai Petrochemical Research Institute discloses that 2-methylpyrazine is used as raw material, and ammonia Synthesis of 2-cyanopyrazine by oxidation technique; etc. In the preparation process of 2-cyanopyrazine, in addition to the reaction control steps, the distillation purification process is also closely related to the product purity and yield. [0003] As a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/26B01D3/42C07D241/24
CPCB01D3/14B01D3/26B01D3/42C07D241/24
Inventor 许小峰张振亮许寿永
Owner 新乡市巨晶化工有限责任公司
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