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Semi-Continuous Arsine Reaction System Disclosure Number: IPCOM000124743D
Publication Date: 2005-May-05
Document File: 3 page(s) / 75K

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Semi-Continuous Arsine Reaction System

Arsine is an important electronic gas for compound electronic devices.  Industrially arsine is made by adding aqueous acid solution to arsenide solids in a batch reactor.  Since all the arsenide solids are charged to the reactor in one dose, the solids sit at the bottom of the reactor.  This type of operation has poor mixing between solids and liquid and agglomeration of solids.  Providing agitation to solids without suspension of solids in liquid will erode equipment and shorten its life.

A new process is described in which a semi-continuous reactor is used to address solids/liquid mixing and equipment erosion.  Two different configurations of this system are described here and depicted in Figure 1 and Figure. In these configurations, arsenide solids are either fed to a reactor directly or are pre-mixed with water before being added to a reactor, as shown in Figure 1 and Figure 2, respectively.  The reactor set up shown in the Figure 1 is called dry-feed semi-continuous reactor (DFSCR), while the one shown in the Figure 2 is called wet-feed semi-continuous reactor (WFSCR).  For the DFSCR, the aqueous acid solution is charged to the reactor first batchwise, or concentrated acid is diluted with water in the reactor to form the concentration of acid required for the reaction.  The arsenide solids are loaded to a solid feeder, such as a screw feeder or a vibration feeder.  The arsenide solids are metered into the reactor to mainta...