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Method for stabilizing heat exchange tubes in the andrussow process

A technology of heat exchangers and sleeves, applied in heat exchange equipment, chemical instruments and methods, fixed tubular conduit assemblies, etc., can solve problems such as hindering commercial viability, excessively expensive sleeves, process efficiency and productivity reduction, etc.

Active Publication Date: 2018-03-02
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing jackets and processes using jacketed heat exchange tubes to produce hydrogen cyanide suffer from a number of problems that prevent their commercial viability, including: Protective jackets with insufficient jacket life, potentially prohibitively expensive sleeves, and reduction in process efficiency and productivity of the hydrogen cyanide production process using sleeves containing the above-mentioned problems

Method used

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  • Method for stabilizing heat exchange tubes in the andrussow process
  • Method for stabilizing heat exchange tubes in the andrussow process
  • Method for stabilizing heat exchange tubes in the andrussow process

Examples

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Embodiment 1

[0058] A ternary gas mixture is formed by combining oxygen-enriched air, ammonia-containing gas, and methane-containing gas. In this ternary gas mixture, the molar ratio of ammonia to oxygen is 1.3:1, and the molar ratio of methane to oxygen is 1.2. A ternary gas mixture containing 27-29.5 v% oxygen is reacted in the presence of a platinum / rhodium catalyst to form crude hydrogen cyanide. Hydrogen was generated during the reaction, and the crude hydrogen cyanide contained 34.5v% of hydrogen. The waste heat boiler consists of carbon steel tube sheets and 392 carbon steel waste heat boiler tubes. Each tube is surrounded by boiling water on all sides. Each tube included a sleeve containing 94 wt% alumina and 6 wt% silica. The length of each waste heat boiler tube is 914.4 cm, and the length of the casing is 17.8 cm. The sleeve extends through the inlet of the tube such that a portion of the sleeve extends 5.01 cm above the inlet of the waste heat boiler tube and 12.7 cm into t...

Embodiment 2

[0060] The crude hydrogen cyanide product was prepared and cooled as in Example 1 using the same casing and spacer as in Example 1, except that no spacers were used. The casing has a lifespan of 2 years.

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Abstract

The present invention relates to an improved method of producing hydrogen cyanide, said method involving a heat exchanger comprising a plurality of tubes, wherein each of said plurality of tubes comprises: a ceramic sleeve, each of said sleeves comprising an isolation layer surrounding at least a portion of said sleeve; and one or more spacers, wherein at least one of said one or more ceramic spacers is placed between said tubes The upper part of the inlet surrounds the sleeve, and the ceramic sleeve is spaced apart from the tube. The invention further relates to a reaction apparatus for the production of hydrogen cyanide, said apparatus relating to a heat exchanger comprising a plurality of tubes, wherein each of said plurality of tubes comprises: a ceramic ceramic extending through the inlet of said tube a sleeve, each of the sleeves comprising an isolation layer surrounding at least a portion of the sleeve; and one or more spacers, wherein at least one of the one or more ceramic spacers is located between the The upper portion of the inlet surrounds the sleeve, and the ceramic sleeve is spaced from the tube. The invention further relates to heat exchangers used in the improved process and reaction apparatus.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Application 61 / 738,775, filed December 18, 2012, the entire contents and disclosure of which is incorporated herein. technical field [0003] The present invention relates to a method of producing a chemical reaction product, such as hydrogen cyanide. More particularly, the present invention relates to an improved and commercially advantageous process for the production of hydrogen cyanide comprising a heat exchanger comprising a plurality of tubes through which crude hydrogen cyanide flows However, each of the plurality of tubes includes a ceramic sleeve extending through the inlet of the tube, wherein the ceramic sleeve is spaced from the tube, ie not in contact with the tube. Background technique [0004] Hydrogen cyanide ("HCN") is traditionally produced on an industrial scale according to the Andrussow process or the BMA process. (See eg Ullman's Encyclopedia of Industrial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/02
CPCC01C3/0212C01C3/022F28D7/16F28D2021/0022F28F19/002Y02P20/129
Inventor 约翰·C·卡顿布兰特·J·斯塔尔曼洛基·王
Owner INVISTA TEXTILES (U K) LTD
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