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Reduction of organonitrile impurity levels in HCN from an oxygen Andrussow process

A technology of oxygen Andrussow method and organic nitrile, which is applied in the direction of inorganic chemistry, chemical instruments and methods, preparation/purification/separation of hydrogen cyanide, etc., which can solve the problems of increased possibility of HCN polymerization and degradation of tower performance

Pending Publication Date: 2020-06-12
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this occurs, the column must be periodically cleaned, otherwise column performance deteriorates and the likelihood of HCN polymerization increases

Method used

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  • Reduction of organonitrile impurity levels in HCN from an oxygen Andrussow process
  • Reduction of organonitrile impurity levels in HCN from an oxygen Andrussow process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 details observations made during a period of time during operation of an oxygen Andrussow reactor during which changes in hydrocarbon composition were found to result in process temperature and product changes.

[0041] A 4 inch inner diameter stainless steel reactor with a ceramic insulating liner inside was used for the pilot test. Forty pieces of 90 wt% Pt / 10 wt% Rh 40 mesh gauze from Johnson Matthey (USA) were loaded as catalyst bed. 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 a simulated production sequence, three reactors were used in an oxygen Andrussow reaction plant to produce hydrogen cyanide from a reaction mixture of about 34 mole percent methane, about 37 mole percent ammonia, and about 27 mole percent oxygen in the presence of a platinum catalyst . The gaseous product stream from the reactor contained about 17 mole % hydrogen cyanide, about 6 mole %...

Embodiment 2

[0048] A 4 inch inner diameter stainless steel reactor with a ceramic insulating liner inside was used for the pilot test. Forty pieces of 90wt%Pt / 10wt%Rh 40 mesh gauze 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 a simulated production sequence, three reactors were used in an oxygen Andrussow reaction plant to produce hydrogen cyanide from a reaction mixture of about 34 mole percent methane, about 37 mole percent ammonia, and about 27 mole percent oxygen in the presence of a platinum catalyst . The gaseous product stream from the reactor contained about 17 mole % hydrogen cyanide, about 6 mole % unreacted ammonia, about 35 mole % hydrogen, about 6 mole % CO, and about 34 mole % H 2 O, based on the reacted NH 3 With an overall yield of approximately 82% (on a molar basis). In the continuous oxygen Andrussow process carried...

Embodiment 3

[0050] A 4 inch inner diameter stainless steel reactor with a ceramic insulating liner inside was used for the pilot test. Forty pieces of 90wt%Pt / 10wt%Rh 40 mesh gauze 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 a simulated production sequence, three reactors were used in an oxygen Andrussow reaction plant to produce hydrogen cyanide from a reaction mixture of about 34 mole percent methane, about 37 mole percent ammonia, and about 27 mole percent oxygen in the presence of a platinum catalyst . The gaseous product stream from the reactor contained about 17 mole % hydrogen cyanide, about 6 mole % unreacted ammonia, about 35 mole % hydrogen, about 6 mole % CO and about 34 mole % H 2 O, based on the reacted NH 3 With an overall yield of approximately 82% (on a molar basis). In the continuous oxygen Andrussow process carried ...

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Abstract

The invention provides an oxygen Andrussow process for production of hydrogen cyanide from a methane-containing feedstock such as natural gas in the presence of oxygen and ammonia over a platinum catalyst, wherein the production of byproduct organonitrile impurities, such as acrylonitrile, is reduced. Limiting the content of C2+ hydrocarbons in the methane feedstock in the oxygen Andrussow process, in contrast to the air Andrussow process, has been found to reduce formation of organonitriles, such as acrylonitrile. The organonitrile impurities can require additional processing for removal, cause fouling of equipment, and can also contribute to hydrogen cyanide polymerization. Reduction of C2+ hydrocarbon levels to less than 2 wt%, or 1 wt%, or less than 0.1 wt%, in the methane can providean improved yield of higher purity HCN. Reduction of C2+ hydrocarbon levels also solves the problem of polymer buildup in process equipment, reducing downtime required for cleaning when higher C2+ hydrocarbon levels are present in the reaction feed.

Description

[0001] This application is a divisional application of the application dated December 12, 2013, the application number is 201310680823.9, and the invention title is "reduction of organic nitrile impurity level in HCN from oxygen Andrussow process". [0002] Cross References to Related Applications [0003] This application claims the U.S. provisional patent application series entitled "REDUCTION OF ORGANONITRILE IMPURITY LEVELS IN HCN FROM ANOXYGEN ANDRUSSOW PROCESS" filed on December 18, 2012, entitled "REDUCTION OF ORGANONITRILE IMPURITY LEVELS IN HCN FROM ANOXYGEN ANDRUSSOW PROCESS" No. 61 / 738,770, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0004] The present disclosure relates to feed purification by the Andrussow process for the production of hydrogen cyanide (HCN) from methane, ammonia and oxygen. Background technique [0005] The Andrussow process is used for the gas-phase production of hydrogen cyanide (HCN) from m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/02
CPCC01C3/0212
Inventor 斯图尔特·福赛思刘爱国马丁·J·伦纳布伦特·J·斯塔尔曼
Owner INVISTA TEXTILES (U K) LTD
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