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Shell-and-tube heat exchanger and method for controlling polymerization in shell-and-tube heat exchanger

A shell-and-tube heat exchanger, polymerization reaction technology, applied in the direction of heat exchanger shell, indirect heat exchanger, heat exchanger type, etc., can solve the problems of clogging heat exchange tubes, hindering continuous operation process, reducing separation efficiency, etc.

Inactive Publication Date: 2006-07-05
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer sticking leads to reduced separation efficiency, clogging heat transfer tubes, and subsequently prevents extended continuous operation

Method used

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  • Shell-and-tube heat exchanger and method for controlling polymerization in shell-and-tube heat exchanger
  • Shell-and-tube heat exchanger and method for controlling polymerization in shell-and-tube heat exchanger
  • Shell-and-tube heat exchanger and method for controlling polymerization in shell-and-tube heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Acrylic acid was purified using a rectification column having an inner diameter of 1000 mm in which 45 stainless steel (SUS 316) sieve trays were installed. Add 200ppm of phenothiazine polymerization reaction inhibitor to the acrylic acid-containing solution obtained by rectification, which is composed of 95wt.% acrylic acid and 3wt.% acetic acid, and then fed into the rectification tower. The solution is refined in the tower. The operating conditions are: the top pressure is 53.3hPa (absolute pressure), the top temperature is 60°C, the bottom pressure is 126.7hPa (absolute pressure), the bottom temperature is 85°C, and the reflux ratio is 8. Based on the amount of steam produced by the evaporation of acrylic acid in the reboiler, prepare 0.3 vol.% gas containing molecular oxygen.

[0075] The condenser is connected to the top of the rectification column. The heat exchange tubes are fixed to the tube sheet by welding to form a condenser. The reboiler is connected to t...

Embodiment 2

[0080] (Example 2: When no gas containing molecular oxygen is used)

[0081] Acrylic acid was purified using a rectification column having an inner diameter of 750 mm in which 50 stainless steel (SUS 316) sieve trays were installed. Add 300ppm of polymerization inhibitor (phenothiazine is used as reaction reagent) to the acrylic acid-containing solution obtained by rectification, which is composed of 75wt.% acrylic acid and 25wt.% acetic acid, and then fed into the rectification tower. The solution is refined in the tower. The operating conditions are: the top pressure is 46.7hPa (absolute pressure), the top temperature is 42°C, the bottom pressure is 133.3hPa (absolute pressure), the bottom temperature is 86°C, and the reflux ratio is 10.

[0082] The condenser and reboiler connected to the top of the rectification column use the solution containing acrylic acid as the tube-side fluid. A seamless stainless steel pipe having a surface roughness, that is, an Ry value defined ...

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PUM

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Abstract

A shell-and-tube heat exchanger for handling an easily polymerizable substance is disclosed, which is characterized by having no part for stagnation of said process fluid on the surfaces for contact with the process fluid. By eliminating undulations from the inner surfaces of the heat transfer tubes, it is made possible to prevent the easily polymerizable substance from polymerizing and, at the same time, prevent adhesion of a polymer to the surfaces. Thus, the efficiency of heat exchange is enhanced and the protracted continuous operation is realized.

Description

technical field [0001] The present invention relates to a shell-and-tube heat exchanger and a method of inhibiting polymerization within the shell-and-tube heat exchanger. More specifically, the present invention relates to a shell and tube heat exchanger for handling substances liable to polymerisation, characterized in that there are no stagnation points for the process fluid on the surfaces in contact with the process fluid. Specifically, the present invention relates to a method for inhibiting polymerization in a shell-and-tube heat exchanger, characterized in that seamless steel pipes are used as the shell-and-tube heat exchanger during the operation of the heat exchanger for handling substances that are prone to polymerize heat exchanger tubes. The method can effectively suppress the polymerization reaction that may occur in the heat exchange tube of the substance that is easy to polymerize. Background technique [0002] A shell-and-tube heat exchanger widely used fo...

Claims

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Application Information

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IPC IPC(8): F28D7/16F28F19/00B01D3/32B01D5/00F28F9/18
CPCB01D3/322B01D5/0012F28D7/16F28F9/18F28F19/00C25F3/24
Inventor 西村武松本行弘
Owner NIPPON SHOKUBAI CO LTD