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Anti-clogging method for heat exchanger and anti-clogging heat exchanger for acetonitrile purification

A technology of heat exchanger and acetonitrile, which is applied in the direction of heat exchanger shell, heat exchange equipment, cleaning heat transfer device, etc., which can solve the problems of increased safety risk, decreased equipment utilization rate, and easy Blockage and other problems, to achieve the effects of heat transfer, space saving, and impact force increase

Active Publication Date: 2012-10-10
CHINA TIANCHEN ENG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is aimed at the easy blockage of the top heat exchanger of the acetonitrile decyanation tower due to the easy polymerization of hydrocyanic acid contained in the crude acetonitrile in the current acetonitrile purification process, the decrease of equipment utilization rate, and the increase of safety risks, etc. phenomenon, to provide a practical anti-blocking method and anti-blocking heat exchanger for acetonitrile purification

Method used

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  • Anti-clogging method for heat exchanger and anti-clogging heat exchanger for acetonitrile purification
  • Anti-clogging method for heat exchanger and anti-clogging heat exchanger for acetonitrile purification
  • Anti-clogging method for heat exchanger and anti-clogging heat exchanger for acetonitrile purification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] When crude acetonitrile enters the purification process of acetonitrile decyanation tower, use the present invention figure 2 , image 3 heat exchanger shown. Process materials enter from process material inlet 1, liquid phase material exits from 2 outlets, and gas phase materials exit from gas phase material outlets from 8; public engineering materials enter from 5 public engineering material inlets and public engineering material outlets 6.

[0043] The nozzle form of heat exchanger described in the present embodiment is as shown in table 1:

[0044] Table 1

[0045] The main parameters

parameter value

Nozzle form

Solid Cone Nozzle

Nominal diameter

600mm

Distance between nozzle and tube sheet

300mm

[0046]The process operating conditions are: the feed temperature of the tube-side fluid is 70-80°C, the outlet temperature is 61-71°C, the operating pressure is 0.001-0.009MPaG, and the condensed liquid phase mater...

Embodiment 2

[0050] When crude acetonitrile enters the purification process of acetonitrile decyanation tower, use the present invention figure 2 , image 3 heat exchanger shown. Process materials enter from process material inlet 1, liquid phase material exits from 2 outlets, and gas phase materials exit from gas phase material outlets from 8; public engineering materials enter from 5 public engineering material inlets and public engineering material outlets 6.

[0051] The heat exchanger described in this embodiment, the nozzle form is as shown in Table 2:

[0052] Table 2

[0053] The main parameters

parameter value

Nozzle form

Solid Cone Nozzle

Nominal diameter

500mm

Distance between nozzle and tube sheet

200mm

[0054] The process operating conditions are: the feed temperature of the tube-side fluid is 70-80°C, the outlet temperature is 61-71°C, the operating pressure is 0.001-0.009MPaG, and the condensed liquid phase material ...

Embodiment 3

[0058] When crude acetonitrile enters the purification process of acetonitrile decyanation tower, use the present invention figure 2 , image 3 heat exchanger shown. Process materials enter from process material inlet 1, liquid phase material exits from 2 outlets, and gas phase materials exit from gas phase material outlets from 8; public engineering materials enter from 5 public engineering material inlets and public engineering material outlets 6.

[0059] Heat exchanger described in the present embodiment, nozzle form is as shown in table 3:

[0060] table 3

[0061] The main parameters

parameter value

Nozzle form

Solid Cone Nozzle

Nominal diameter

450mm

Distance between nozzle and tube sheet

100mm

[0062] The process operating conditions are: the feed temperature of the tube-side fluid is 70-80°C, the outlet temperature is 61-71°C, the operating pressure is 0.001-0.009MPaG, and the condensed liquid phase material d...

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Abstract

The invention provides an anti-clogging method for a heat exchanger and an anti-clogging heat exchanger for acetonitrile purification. The heat exchanger adopts a vertical fixed tube sheet type structure; a nozzle is placed in an upper channel box of the heat exchanger; partial cooled technological material subjected to heat exchange through the heat exchanger serves as washing fluid and is returned to an inlet of the heat exchanger; the washing fluid is mixed with a polymerization inhibitor at the inlet of the heat exchanger and sprayed in a heat exchange pipe through the nozzle; further the top of the heat exchange pipe adopts a zigzag structure, thereby facilitating the uniform distribution of the washing fluid in the heat exchange pipe; and the added washing fluid increases the total material quantity inside the heat exchange pipe, impact is increased, temperature is reduced, the blockage of the heat exchanger caused by prussic acid aggregation is effectively avoided, and the industrial application value is high.

Description

technical field [0001] The invention belongs to the field of heat exchangers, in particular to an anti-blocking method of a heat exchanger for acetonitrile purification and an anti-blocking heat exchanger. Background technique [0002] As an organic solvent with excellent performance, acetonitrile is also an important raw material for fine chemicals. Widely used in petrochemical, pharmaceutical, pesticide, surfactant, dye and many other fields. The methods for industrial production of acetonitrile include direct synthesis (such as the reaction of acetic acid or propane or ethanol with ammonia) and indirect methods. The indirect method mainly refers to the purification of crude acetonitrile produced from the ammoxidation of propylene to produce acrylonitrile while being a by-product. At present, the latter is still the main source of industrial production of acetonitrile, and its output accounts for 2% to 3% of the output of acrylonitrile. [0003] The crude acetonitrile ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G15/00F28F9/00
Inventor 赵文文马国栋王美娇郑仁王瑞博
Owner CHINA TIANCHEN ENG
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