Operational controls for inert gas blanketing for Andrussow process

A gas, ternary gas technology, which is applied in the preparation/purification/separation of hydrogen cyanide, chemical instruments and methods, inorganic chemistry, etc., and can solve the problem of no disclosure of inert gas covering system, etc.

Active Publication Date: 2014-08-06
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the Andrussow process and methods of recovering hydrogen cyanide are known, there is little disclosure dealing with 1) an inert gas blanket system or 2) a system for monitoring and controlling crude cyanide when the ternary gas mixture contains at least 25% by volume oxygen. Method control of oxygen content in hydrogen hydride product or ammonia absorber off-gas stream

Method used

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  • Operational controls for inert gas blanketing for Andrussow process

Examples

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Embodiment 1

[0070]A ternary gas mixture is formed by combining pure oxygen, an ammonia-containing gas, and a methane-containing gas. The molar ratio of methane to oxygen in the ternary gas mixture was 1.3:1 and the ratio of methane to oxygen in the ternary gas mixture was 1.2:1. A ternary gas mixture comprising from 27 to 29.5 volume percent oxygen is reacted in the presence of a platinum / rhodium catalyst to form a crude hydrogen cyanide product. A gas sensor is present to measure the oxygen content in the crude hydrogen cyanide product before it enters the ammonia and HCN separation step. The sensor measures oxygen levels using chromatography. A sensor reporting an oxygen level of 0.5% by volume indicates a system failure and activates the inert gas blanket system. The inert gas is nitrogen. The conduit for introducing the oxygen-containing gas into the reactor has two valves, a first oxygen valve and a second oxygen valve in series, the second oxygen valve being downstream and closer...

Embodiment 2

[0072] The crude hydrogen cyanide product was prepared according to Example 1. The crude hydrogen cyanide product is directed through an ammonia absorber, an ammonia scrubber, and an HCN absorber to form an off-gas stream. There are sensors to detect the oxygen content in the exhaust gas stream. Sensors reporting oxygen levels greater than 2% by volume indicate a system failure and activate the inert gas blanket system. The operation of the inert gas is the same as in Example 1.

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Abstract

The present invention relates to a system and a process for producing hydrogen cyanide and more particularly, to a process for controlling operational stability of the system and process by blanketing the system with inert gas. More particularly, the present invention relates to the flushing of the system with an inert gas when a crude hydrogen cyanide product exceeds a threshold of oxygen, such as greater than 0.4 vol.% oxygen.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application 61 / 738829, filed December 18, 2012, the entire disclosure of which is incorporated herein. technical field [0003] The present invention relates to inert gas blanketing systems. The system can be used in a process for the production of hydrogen cyanide using the Andrussow process. In particular, the present invention relates to reaction apparatus for the production of hydrogen cyanide, and the control of the oxygen content in the crude hydrogen cyanide product. Background technique [0004] Typically, hydrogen cyanide ("HCN") is produced on an industrial scale according to the Andrussow method or the BMA method (see, for example, Ullman's Encyclopedia of Industrial Chemistry, Vol. A8, Weinheim, 1987, pp. 161-163). For example, in the Andrussow process, HCN is produced economically by reacting ammonia with a methane-containing gas and an oxygen-containin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/02
CPCC01C3/0212C01C3/022
Inventor 约翰·C·卡顿约翰·F·格尔克盖理·L·加利尔
Owner INVISTA TEXTILES (U K) LTD
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