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32 results about "Andrussow process" patented technology

The Andrussow process is an industrial process for the production of hydrogen cyanide from methane and ammonia in the presence of oxygen and a platinum catalyst. The process is based on a reaction that was discovered by Leonid Andrussow in 1927. In the following years he developed the process that is named after him. HCN is also produced in the BMA process.

Method of inductively igniting a chemical reaction

An improved method of igniting a catalyzed gas phase chemical reaction involving the act of providing a reactor vessel (10), wherein the gaseous reactant, continuously passing through the reactor, makes contact with a solid phase metallic catalyst media (18), with an inductive coil (14) within the reactor (10) on the inlet side of the catalyst and a porous thermal, spark and radiation barrier (17) between the induction coil (14) and solid catalyst (18). According to the improved method of ignition, the metallic catalyst media (18) is inductively heated in order to ignite the chemical reaction and after ignition the inductive heating is suspended and the exotherm of the chemical reaction is thereafter relied upon to sustain the reaction temperature. Such a reactor and method of operation is particularly useful for continuous production of hydrogen cyanide by the Andrussow process.
Owner:INVISTA TECHNOLOG IES S A R L

Production system and production method for synthesizing hydrocyanic acid by Andrussow process

The invention provides a production system and a production method for synthesizing hydrocyanic acid by an Andrussow process. The production system comprises a natural gas conveying system, an air conveying system, an ammonia gas conveying system and mixed reaction equipment, wherein an outlet of the air conveying system and an outlet of the ammonia gas conveying system are joined at one place and communicated with an inlet of the mixed reaction equipment; an outlet of the natural gas conveying system is communicated with an inlet of the mixed reaction equipment. The production method comprises the following steps: mixing air and ammonia gas; mixing the mixed gas with natural gas; and introducing the mixture into a reactor for reaction through a flame arrester. According to the production system and production method provided by the invention, hot ammonia gas and hot air are mixed on an air pipeline, three materials are separately preheated respectively, the burst points of the three gases can be avoided in a large range, the process route and process equipment are simplified, the reaction efficiency is improved, the energy consumption is reduced, the raw material natural gas can be saved by 10-15%, and 5-5.5 million yuan can be saved per year.
Owner:CHONGQING UNISPLENDOUR INT CHEM

Preparation method of D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate

The invention aims at the chemical industry field, and relates to a preparation method of a D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method comprises the following steps: preparing a hydrocyanic acid mixed gas by adopting an Andrussow process, and reacting the hydrocyanic acid mixed gas with methylthiopropionaldehyde to obtain a 2-hydroxy-4-methylthiobutyronityile system, hydrolyzing the 2-hydroxy-4-methylthiobutyronityile system by an inorganic alkali to obtain D,L-2-hydroxy-4-methylthiobutyrate, and chelating the D,L-2-hydroxy-4-methylthiobutyrate with a trace metal element salt to generate the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method has the advantages of few technological steps, cheap and easily available raw materials, stable properties of the above intermediate, and low total production cost; the obtained D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate has the advantages of high yield, high purity and large bulk density; and the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate can be effectively mixed with feeds as an animal feed additive to supplement trace elements and amino acids in the daily ration and improve the endozoic production and immunity performances, and can also be used as a medicinal reagent.
Owner:NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD

Variation of ammonia ratio in Andrussow process

ActiveCN103864106AAddress or improve prepared higherFix or improve costsSolidificationLiquefactionAndrussow processChemistry
The invention discloses variation of ammonia ratio in an Andrussow process. Methane and ammonia raw materials are typically the major costs for HCN production. The methods described herein can be used to vary the molar ratio of methane to ammonia during HCN production to reduce costs.
Owner:INVISTA TEXTILES (U K) LTD

The production system and the production method of Angle's method for synthesizing hydrocyanic acid

The invention provides a production system and a production method for synthesizing hydrocyanic acid by an Andrussow process. The production system comprises a natural gas conveying system, an air conveying system, an ammonia gas conveying system and mixed reaction equipment, wherein an outlet of the air conveying system and an outlet of the ammonia gas conveying system are joined at one place and communicated with an inlet of the mixed reaction equipment; an outlet of the natural gas conveying system is communicated with an inlet of the mixed reaction equipment. The production method comprises the following steps: mixing air and ammonia gas; mixing the mixed gas with natural gas; and introducing the mixture into a reactor for reaction through a flame arrester. According to the production system and production method provided by the invention, hot ammonia gas and hot air are mixed on an air pipeline, three materials are separately preheated respectively, the burst points of the three gases can be avoided in a large range, the process route and process equipment are simplified, the reaction efficiency is improved, the energy consumption is reduced, the raw material natural gas can be saved by 10-15%, and 5-5.5 million yuan can be saved per year.
Owner:CHONGQING UNISPLENDOUR INT CHEM

Reactor Scheme in the Andrussow Process

ActiveCN103864111BRate of consistent preparationConsistent and predictable rates of preparationCatalytic gas-gas reactionEnergy inputProduction rateGaseous ammonia
A method for producing hydrogen cyanide comprising: feeding a reaction mixture feed comprising gaseous ammonia, methane and oxygen to a plurality of main reactors each comprising a platinum-containing catalyst bed; determining the whether the percent yield of hydrogen cyanide in any one of the plurality of primary reactors is at or below a threshold; when the percent yield of hydrogen cyanide in any one of the plurality of primary reactors is at or below at said threshold, identifying one or more suboptimal reactors among said plurality of primary reactors; and when said one or more suboptimal reactors are identified, supplementing said reaction mixture feed Feed to one or more supplementary reactors, wherein each of the one or more supplementary reactors includes a platinum-containing catalyst bed. The supplemental feeding may be performed in place of the feed of the reaction mixture to the one or more suboptimal reactors, or in addition to the feed of the reaction mixture to the one or more suboptimal reactors In addition to the feed, the supplementary feed is also carried out. The overall process is sufficient to maintain the total measured hydrogen cyanide production rate in the one or more supplementary reactors and the main reactor within a desired total hydrogen cyanide production rate range.
Owner:INVISTA TEXTILES (U K) LTD

Preparation method of d,l-2-hydroxy-4-methylthiobutyric acid trace element chelate

The invention aims at the chemical industry field, and relates to a preparation method of a D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method comprises the following steps: preparing a hydrocyanic acid mixed gas by adopting an Andrussow process, and reacting the hydrocyanic acid mixed gas with methylthiopropionaldehyde to obtain a 2-hydroxy-4-methylthiobutyronityile system, hydrolyzing the 2-hydroxy-4-methylthiobutyronityile system by an inorganic alkali to obtain D,L-2-hydroxy-4-methylthiobutyrate, and chelating the D,L-2-hydroxy-4-methylthiobutyrate with a trace metal element salt to generate the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method has the advantages of few technological steps, cheap and easily available raw materials, stable properties of the above intermediate, and low total production cost; the obtained D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate has the advantages of high yield, high purity and large bulk density; and the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate can be effectively mixed with feeds as an animal feed additive to supplement trace elements and amino acids in the daily ration and improve the endozoic production and immunity performances, and can also be used as a medicinal reagent.
Owner:NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD

Method for stabilizing heat exchange tubes in the andrussow process

The present invention relates to an improved method of producing hydrogen cyanide, said method involving a heat exchanger comprising a plurality of tubes, wherein each of said plurality of tubes comprises: a ceramic sleeve, each of said sleeves comprising an isolation layer surrounding at least a portion of said sleeve; and one or more spacers, wherein at least one of said one or more ceramic spacers is placed between said tubes The upper part of the inlet surrounds the sleeve, and the ceramic sleeve is spaced apart from the tube. The invention further relates to a reaction apparatus for the production of hydrogen cyanide, said apparatus relating to a heat exchanger comprising a plurality of tubes, wherein each of said plurality of tubes comprises: a ceramic ceramic extending through the inlet of said tube a sleeve, each of the sleeves comprising an isolation layer surrounding at least a portion of the sleeve; and one or more spacers, wherein at least one of the one or more ceramic spacers is located between the The upper portion of the inlet surrounds the sleeve, and the ceramic sleeve is spaced from the tube. The invention further relates to heat exchangers used in the improved process and reaction apparatus.
Owner:INVISTA TEXTILES (U K) LTD

Reactor scheme in Andrussow process

ActiveCN103864111ARate of consistent preparationConsistent and predictable rates of preparationProcess control/regulationCatalytic gas-gas reactionPlatinumProduction rate
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.
Owner:INVISTA TEXTILES (U K) LTD
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