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A Continuous Process for Manufacturing Arsine from Arsenide

IP.com Disclosure Number: IPCOM000124744D
Publication Date: 2005-May-05
Document File: 2 page(s) / 46K

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The IP.com Prior Art Database

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A Continuous Process for Manufacturing Arsine from Arsenide

Arsine is produced by reacting arsenide solids with aqueous acid solution in a batch reactor.  The chemistry of the reaction can be described as below:

            Arsenide + Acid ===è Arsine + Salt

From the reaction shown above, a by-product of salt is formed when arsenide is converted to arsine.  At the end of the reaction, the reaction waste contains high concentration of metal salts in an aqueous slurry. A portion of the metal salts in the reaction waste may be in solution and a portion may be solid.  This reaction waste slurry is transferred into a waste storage system.  Then the reactor is recharged with reactants and batch cycle repeats.  The batch process has a significant amount of down-time during which no product is evolved, and also involves a significant amount of operator interventions.  The batch reactor also has product losses due to reactor and line purges between batches. 

To reduce operator intervention, reduce idle time, reduce reactor size, and reduce product loss, a continuous process for manufacturing arsine is described here.  The flow diagram is shown in Figure 1. 

As shown in the Figure 1, arsenide solids are fed to a mixing device, such as an eductor, using a solid feeder, such as a screw feeder or vibrating feeder.  In the mixing device the solids mix with recycled aqueous acid solution recycled.  This mixture of solids and acid solution is fed to a reactor where the arsenide reacts with acid to form arsine gas.  The reactor can be a stirred reactor or a plug flow reactor...