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Reactor scheme in Andrussow process

A technology of reactor and main reactor, applied in the reaction of gas and gas under catalytically active bodies, chemical instruments and methods, preparation/purification/separation of hydrogen cyanide, 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

In addition, changes in the concentrations or flow rates of reagents in an oxygen-enriched or oxygen Andrussow process can lead to larger differences in the overall efficiency of the process compared to the air Andrussow process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] The present disclosure may be better understood by reference to the following examples, which are provided by way of example. The present disclosure is not limited to the examples given herein.

Embodiment 2

[0071] Example 2 - Supplementary Reactor Replaces Suboptimal Primary Reactor

[0072] 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 wire mesh from Johnson Matthey (USA) were loaded as catalyst beds. A perforated alumina sheet was used for the catalyst sheet support. Set the total flow rate at 2532 SCFH (standard cubic feet per hour). In the production sequence, hydrogen cyanide was produced from three main reactors similar in configuration to that described in Comparative Example 1. The apparatus of Example 2 also included a supplementary reactor. The performance of the main reactor was monitored by determining the overall yield of hydrogen cyanide. The lower limit of the optimal yield in this example is based on NH 3 3% lower than usual. One of the three primary reactors was detected to have a suboptimal gaseous product stream containing greater than 0.6 mol% un...

Embodiment 3

[0075] Example 3 - Supplementary Reactor Running Simultaneously with Suboptimal Primary Reactor

[0076] 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 wire mesh from Johnson Matthey (USA) were loaded as catalyst beds. A perforated alumina sheet was used for the catalyst sheet support. Set the total flow rate at 2532 SCFH (standard cubic feet per hour). In the production sequence, the hydrogen cyanide production plant consists of three main reactors and one supplementary reactor, similar to the configuration described in Example 2. The performance of the main reactor was monitored by determining the overall yield of hydrogen cyanide. The lower limit of the optimal yield in this example is based on NH 3 3% lower than normal. One of the three primary reactors was detected to have a suboptimal gaseous product stream containing greater than 0.6 mol% unreacted methane. ...

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Abstract

A method for preparing hydrogen cyanide comprises the following steps: feeding a reaction mixture feed material to a plurality of main reactors of catalyst beds respectively containing platinum, wherein the feeding reaction materials contains gaseous ammonia, methane and oxygen; determining whether the percentage yield of the hydrogen cyanide in any one of the main reactors is at or below a threshold value; when the percent yield of any one of the main reactors is at or below the threshold value, identifying one or more subprime reactors from the main reactors; and, when one or more subprime reactor is identified, complementally feeding the reaction mixture feed material to one or more complementary reactors, wherein each of the one or more complementary reactors comprises the catalyst bed containing the platinum. Complementary material feeding capable of replacing material feeding of the reaction mixture feed material to the one or more subprime reactors is performed, or, besides the material feeding of the reaction mixture feed material to the one or more subprime reactors, the complementary material feeding is also performed. The total method can enough to keep the total measurement hydrogen cyanide production rate in the one or more complementary reactors and the main reactors within a scope of the required total hydrogen cyanide production rate.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application Serial No. 61 / 738,884, entitled "REACTOR SCHE ME IN ANDRUSSOW PROCESS," filed December 18, 2012, the disclosure of which is adopted This reference is hereby incorporated 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 is used for the gas phase production of hydrogen cyanide (HCN) from methane, ammonia and oxygen over a platinum or platinum alloy 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 platinum or a platinum alloy. Methane can be provided by natural gas, which can be further purified. Hydrocarbons with two carbons, three carbons or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/02
CPCB01J19/2445B01J19/0006C01C3/022B01J12/007B01J19/2495B01J2219/00038B01J2219/002B01J2219/00202B01J2219/00213B01J2219/0024Y02P20/129C01C3/0216C01C3/0212
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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