Apparatus and method for reducing catalyst poisoning in an andrussow process

A catalyst, hydrogen cyanide technology, applied in chemical instruments and methods, separation methods, preparation/purification/separation of hydrogen cyanide, etc., can solve the problems of reducing HCN catalyst life, increasing downtime, increasing by-product preparation, etc.

Active Publication Date: 2014-06-18
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poisoning of the HCN catalyst can reduce the efficiency of the Andrussow process, such as reduced HCN conversion, increased by-product production, decreased HCN catalyst lifetime, increased downtime for HCN catalyst replacement, or a combination thereof

Method used

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  • Apparatus and method for reducing catalyst poisoning in an andrussow process
  • Apparatus and method for reducing catalyst poisoning in an andrussow process

Examples

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Effect test

Embodiment 1

[0044] Example 1 - Comparing the Andrussow method

[0045] This example demonstrates that the Andrussow process using a desulfurization unit can reduce the sulfur content in the feed stream.

[0046] In the Andrussow process, the sulfuric acid (H 2 S) was removed by first heating the natural gas to 100° C. with a shell and tube exchanger using steam. The shell and tube exchanger is designed to heat natural gas from 25°C to 100°C with a flow of 3,100 lb / hr of steam to the shell. The system was optimized to remove H at 100 °C 2 S.

[0047] Two vessels in series contain zinc oxide (ZnO) desulfurization pellets. ZnO loading on the inclined screen. The catalyst has a density of 65 lbs / ft3. At 100°C, the catalyst will absorb 5% by weight of sulfur before being exhausted. Average H at 2.0ppm 2 S feed concentration, expected catalyst lifetime of 3 years. However, substantially longer lifetimes are expected because of the H in methane from natural gas plant (NGP) units 2 S co...

Embodiment 2

[0048] Example 2 - Comparative Andrussow process with varying oxygen feed concentration

[0049] This example demonstrates that the Andrussow process using an enriched source of oxygen generally reduces HCN catalyst lifetime.

[0050] Hydrogen cyanide is produced via various Andrussow processes. One process, the air Andrussow process, uses air containing 21% oxygen by volume as the oxygen-containing gas. The second process, the air-enriched Andrussow process, employs an oxygen-containing gas having greater than about 21 vol% oxygen and less than about 100 vol% oxygen. A third process, the oxygen Andrussow process, employs an oxygen-containing gas of about 100 volume percent oxygen. Platinum-containing catalysts were used for all processes. A 4 inch inner diameter stainless steel reactor with a ceramic insulating liner inside was used for the pilot test. Forty sheets of 90wt%Pt / 10wt%Rh 40 mesh gauze from Johnson Matthey (USA) were loaded as catalyst beds. A perforated alum...

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Abstract

Processes and systems for the production of hydrogen cyanide via the Andrussow process are described. A reaction zone, wherein oxygen, ammonia, and methane can be allowed to react in the presence of a catalyst comprising platinum to provide hydrogen cyanide. A desulfurization zone, wherein a feed stream comprising sulfur and at least one of the oxygen, the ammonia, and the methane can be contacted with a desulfurization material to produce a sulfur- reduced feed stream that is provided to the reaction zone. In an example, the desulfurization material includes zinc oxide.

Description

[0001] Cross References to Related Applications [0002] This application claims the U.S. provisional patent application serial number entitled "APPARATUS AND METHOD FOR REDUCING CATALYST POISONING IN AN ANDRUSSOW PROCESS" filed on December 18, 2012, entitled "Apparatus and Method for Reducing Catalyst Poisoning in the Andrussow Process" 61 / 738,778, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to a reactor scheme for the Andrussow process for the production of hydrogen cyanide (HCN) from methane, ammonia and oxygen. Background technique [0004] The Andrussow process can be used for the gas phase production of hydrogen cyanide (HCN) from methane, ammonia and oxygen over a platinum catalyst. Filtered ammonia, natural gas, and air are fed into the reactor and heated to about 800°C to about 2,500°C in the presence of a catalyst comprising at least platinum. Methane can be provided by natur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/02
CPCC01C3/0212B01D53/8603C01C3/022C01C3/0216
Inventor 斯图尔特·福赛思马丁·J·伦纳刘爱国布伦特·J·斯塔尔曼
Owner INVISTA TEXTILES (U K) LTD
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