Apparatus And Method For Hydrogen Recovery In Andrussow Process

A hydrogen recovery system and shuttle technology, applied in the field of hydrogen recovery, can solve problems such as wasting hydrogen

Active Publication Date: 2014-07-09
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem of wasting hydrogen in the Andrussow process is solved or ameliorated by recovering the hydrogen from the off-gas rather than, for example, flaring it

Method used

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  • Apparatus And Method For Hydrogen Recovery In Andrussow Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1: Contrasting air and oxygen Andrussow exhaust gas composition

[0101] This example demonstrates that the Andrussow process using a highly enriched source of oxygen generally produces a waste stream with a higher hydrogen content than processes employing air as the oxygen source.

[0102] A 4 inch ID 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). Hydrogen cyanide is produced via two independent Andrussow processes. One method is the oxygen Andrussow process using a gaseous reaction mixture comprising 35% by volume methane, 38% by volume ammonia and 27% by volume of substantially pure oxygen. The second method is the air Andrussow method using about 17 vol% methane, 19 vol% amm...

Embodiment 2

[0108] Example 2: Hydrogen content in gaseous waste stream

[0109] This example illustrates how the hydrogen content of the gaseous waste stream varies in an Andrussow process using reactants of an oxygen-containing feed stream with different amounts of oxygen.

[0110] Hydrogen cyanide was prepared via a series of separate Andrussow processes performed as described for Example 1 . However, each process was performed using a different reactant oxygen-containing feed stream, wherein the oxygen content of the feed stream varied between about 20.9% v / v to about 100% v / v oxygen, as shown in Table 3 .

[0111] Ammonia is removed from each product stream separately in a process including absorption into the ammonium phosphate stream. Hydrogen cyanide is then removed from the ammonia-lean product stream in a process involving acidification of the water, producing hydrogen cyanide product and gaseous waste streams separately for each process.

[0112] The composition of the gaseou...

Embodiment 3

[0118] Example 3: Hydrogen Recovery by Pressure Swing Adsorption

[0119] This example may illustrate how hydrogen can be recovered from an Andrussow product stream using a pressure swing absorption unit.

[0120] Hydrogen cyanide is produced via the Andrussow process using a gaseous reaction mixture comprising 35 vol% methane, 38 vol% ammonia, and 27 vol% substantially pure oxygen in the presence of a platinum catalyst. A 4 inch ID 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). The gaseous product stream from the reactor contained 16.6 vol% hydrogen cyanide, 6.1 vol% unreacted ammonia, 34.5 vol% hydrogen, 6.0 vol% CO and 33.6 vol% H 2 O.

[0121] Ammonia is removed from each product stream s...

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Abstract

The application provides an apparatus and a method for hydrogen recovery in an andrussow process. The present invention relates to the hydrogen recovery from the andrussow process for making hydrogen cyanide via methane, ammonia and oxygen. The method comprises the following steps: (a) adjusting a reaction mixture comprising methane, ammonia and oxygen to provide the reaction mixture with sufficient oxygen to generate a gaseous waste stream that has at least 40% hydrogen after removal of ammonia and recovery of hydrogen cyanide; and(b) removing components from the gaseous waste stream to generate recovered hydrogen. The apparatus comprises an actor and a hydrogen recovery system. According to the present invention, by the described hydrogen recovery method and system, the waste and loss problems of the hydrogen rich in oxygen and oxygen andrussow outcome stream are solved safely.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Patent Application Serial No. 61 / 738,685, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to hydrogen recovery for the Andrussow process for the production of hydrogen cyanide (HCN) from methane, ammonia and oxygen. Background technique [0004] The Andrussow reaction is carried out in the presence of a suitable catalyst, such as a Pt-containing catalyst, [0005] as follows: [0006] 2NH 3 +2CH 4 +3O 2 →2HCN+6H 2 o [0007] A reactant gas feed stream comprising a gaseous ammonia feed stream, a gaseous methane feed stream, and a gaseous oxygen feed stream reacts in the presence of a platinum-containing catalyst to form hydrogen cyanide (HCN) and water in a product stream. However, the reaction does not proceed with 100% efficiency and the product stream contains, in addition to hydrogen...

Claims

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Application Information

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IPC IPC(8): C01B3/50C01C3/02
CPCC01B3/56C01C3/0212C01B2203/0233C01B2203/0405C01B2203/0415C01B2203/043C01B2203/0465C01B2203/0495C01B2203/1676B01D53/047B01D2253/106B01D2253/102B01D2253/108B01D2253/116B01D2256/16B01D2257/406B01D2257/408
Inventor 斯图尔特·福赛思马丁·J·伦纳刘爱国布伦特·J·斯塔尔曼
Owner INVISTA TEXTILES (U K) LTD
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