Patent ID: 8657958
Filing Date: 2014-02-25
Classification: C01B,C23C

Abstract:
1. An improved CVD reactor system, said improvement comprising a monosilane and hydrogen recovery and recycle system including monosilane and hydrogen sources, wherein: i) hot reactor gas, comprising unreacted monosilane, hydrogen and impurities, from a CVD reactor is cooled and purified by filtration, absorption and fractional distillation to produce purified monosilane, a separate hydrogen stream and separate impurities; ii) said separate hydrogen stream is further cooled and purified to produce a cooled, purified hydrogen stream; iii) wherein a countercurrent heat exchanger between said cooled, purified hydrogen stream and said hot reactor gas cools the hot reactor gas from the CVD reactor; iv) said purified monosilane is compressed with a first compressor and fed back into said CVD reactor; v) wherein said purified hydrogen stream is compressed with a second compressor and fed back into said CVD reactor after being used in said countercurrent heat exchanger.