Method for producing hydrocyanic acid (HCN)

A hydrogen cyanide and oxygen technology, which is applied in the field of hydrogen cyanide (HCN) preparation, can solve problems such as damage to catalyst nets, danger of temperature peaks, catalyst destruction, etc., so as to ensure safe operation mode, increase production capacity, and improve yield Effect

Inactive Publication Date: 2008-09-24
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] Risk of localized temperature peaks, which can damage the catalyst mesh
[0023] 2. Increased oxygen supply at the catalyst leads to enhanced NH 3 Oxidized to N 2 and thus lead to a based on the NH used 3 Calculated HCN yield decreased
[0025] 4. Increased catalyst web temperature may occur through oxygen

Method used

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  • Method for producing hydrocyanic acid (HCN)
  • Method for producing hydrocyanic acid (HCN)
  • Method for producing hydrocyanic acid (HCN)

Examples

Experimental program
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Embodiment

[0062] The following examples were carried out in laboratory equipment consisting of a gas metering system with thermal mass flow regulators for the reactant gases used (methane, ammonia, air, oxygen), for the reaction Electric heater for preheating of the feed gas, reactor part with 6 layers of Pt / Rh10 catalyst mesh (inner diameter d: 25 mm) and downstream HCN scrubber for neutralization of formed HCN with NaOH solution.

[0063] The reaction gases were analyzed online by GC. In order to account for the amount of HCN formed, the CN content in the effluent of the HCN scrubber was also determined by argentometric titration. Starting from a mode of operation corresponding to known operating conditions using air as the source of oxygen, air oxygen was gradually replaced by pure oxygen in the test series, while at constant CH 4 / NH 3 Molar O 2 / NH 3 The ratio is reduced. All experiments were performed with a constant reactant gas volume flow of 24 N1 (standard liter) / min.

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Abstract

The invention relates to a method for preparing hydrogen cyanide according to andrussow process, which is carried out by reacting methane gas, ammonia gas and oxygen-containing gas at rising temperature on catalyst. Oxygen has a volume proportion (O<2>/(O<2>+N<2>) of 0.2 to 1.0 corresponding to total volume of nitrogen and oxygen, and the reaction is carried out by adopting mixture of incombustible reactant gas.

Description

technical field [0001] The present invention relates to improvements in the Andrussow process for the preparation of hydrogen cyanide (HCN). Background technique [0002] The synthesis of hydrogen cyanide (hydrocyanic acid) according to the Andrussow method is described in Ullmann's Encyclopedia of Industrial Chemistry, Vol. 8, VCH Verlagsgesellschaft, Weinheim 1987, pp. 161-162. A reactant gas mixture, usually comprising methane or a methane-containing natural gas stream, ammonia and oxygen, is led through the catalyst mesh in a reactor and reacted at a temperature of about 1000°C. The necessary oxygen is usually used in the form of air. The catalyst mesh is composed of platinum or a platinum alloy. The composition of the reactant gas mixture roughly corresponds to the stoichiometry of the overall reaction equation proceeding exothermically as follows: [0003] CH 4 +NH 3 +3 / 2 O 2 →HCN+3H 2 OdHr=-473.9kJ. [0004] The outgoing reaction gas contains product HCN, unco...

Claims

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Application Information

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IPC IPC(8): C01C3/02
CPCC01C3/0212C01C3/02
Inventor T·舍菲尔H·西格特T·克罗比
Owner EVONIK ROEHM GMBH
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