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Enhanced methane control for the andrussow method

A technology for methane gas and hydrogen cyanide, which is applied in the preparation/purification/separation of hydrogen cyanide, chemical instruments and methods, and inorganic chemistry, etc., and can solve the problems of insufficient efficiency of residual ammonia and loss of yield.

Active Publication Date: 2018-04-17
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Existing HCN production processes suffer from various problems, including yield losses in the production of HCN and inefficiencies in residual ammonia recovery and recycling

Method used

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  • Enhanced methane control for the andrussow method
  • Enhanced methane control for the andrussow method
  • Enhanced methane control for the andrussow method

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preparation example Construction

[0045] Preparation of methane-containing gas

[0046] As those of ordinary skill in the art can understand, the source of methane may be different, and may be obtained from renewable raw materials such as landfills, farms, biogas from fermentation, or from natural gas, petroleum-associated gas, coal gas, etc. And gas hydrate fossil fuels, such as VN Parmon, "Source of Methane for Sustainable Development", P.273-284 and Sustainable Strategies for the Upgranding of Natural Gas: Fundamentals, Challenges, and Opportunities (2003) Further description. For the purposes of the present invention, the purity of methane and the consistent composition of the source containing methane are important.

[0047] As a source of methane for methane-containing gas, natural gas is an impure state of methane. That is, natural gas is a methane-containing gas that can be used to provide carbon atoms for HCN produced in the process of the present invention. However, in addition to methane, natural gas...

Embodiment 1

[0087] According to the Andrussow method, air is used as an oxygen-containing gas to form a ternary mixed gas to produce crude hydrogen cyanide products. The ternary mixed gas is passed through the catalyst bed to form a crude hydrogen cyanide product. When the crude hydrogen cyanide product is discharged from the reactor unit, its methane content is measured. Such as image 3 As shown, as the methane concentration in the crude cyanide cyanide product increases, the concentration of acetonitrile also increases. When pure oxygen is used instead of air as the intake air, this tendency of increased nitrile formation can also be expected.

Embodiment 2

[0089] According to the Andrussow method, pure oxygen is used as an oxygen-containing gas to form a ternary mixed gas to produce crude hydrogen cyanide products. A molar ratio of ammonia to oxygen of 1.3:1 and a molar ratio of methane to oxygen of 1.2:1 are used to form the ternary mixed gas. The ternary mixed gas contains 28.5% by volume of oxygen. The reactor has an inner diameter of 142.2 cm, and the platinum / rhodium catalyst bed is placed on a cast ring support extending 2.86 cm into the reactor so that the catalyst bed forms a 90% pass zone of the crude hydrogen cyanide product. In 150 days of continuous operation, the diameter of the catalyst bed shrank by 0.64 to 1.26 cm, and there was no methane side-flow catalyst bed, because the ring-shaped support supported the shrinking catalyst bed. The crude cyanide cyanide product contains 0.2-0.3% by volume of methane.

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Abstract

The present invention relates to a process for the production of hydrogen cyanide, more particularly to a process for the production of crude hydrogen cyanide comprising 0.05-1% by volume of methane. The invention also relates to a reactor for the production of crude hydrogen cyanide product, said reactor having a catalyst bed supported by an annular support providing a passage zone having an area of ​​at least 90% of the cross-sectional area of ​​the reactor, and wherein The annular support substantially prevents catalyst bed bypass. The invention also relates to a crude hydrogen cyanide comprising 0.05-1% by volume of methane.

Description

[0001] Cross references to related applications [0002] This application claims to enjoy the priority of US application 61 / 738,623 filed on December 18, 2012, the entire content and disclosure of the application is incorporated herein. Technical field [0003] The invention relates to a method for producing hydrogen cyanide. More specifically, the present invention relates to a method for controlling the amount of methane in the crude hydrogen cyanide product by using a controlled feed composition, and producing hydrogen cyanide with enhanced yield and yield. Background technique [0004] Traditionally, hydrogen cyanide (HCN) is produced on an industrial scale by the Andrussow method or the BMA method (for example, see Ullman's Encyclopedia of Industrial Chemistry, Volume A8, Weinheim 1987, P. 161-163). For example, in the Andrussow process, ammonia can be reacted with methane-containing gas and oxygen-containing gas in a reactor at high temperature in the presence of a suitable c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/02
CPCC01C3/0225C01C3/0216
Inventor 约翰·C·卡顿
Owner INVISTA TEXTILES (U K) LTD
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