EFFLUENT GAS RECOVERY PROCESS FOR SILICON PRODUCTION
First Claim
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1. A method for recycling effluent gas from a polysilicon production reactor, comprising the steps of:
- directing an effluent gas from a polysilicon reactor to a gas separation unit comprising at least one gas separation membrane, said effluent gas comprising SiHCl3, SiCl4, HCl, and H2;
directing a sweep gas comprising high purity SiHCl3 to a permeate side of the membrane;
recovering a recycle gas from the permeate side, the recycle gas comprising H2 permeated through the membrane from the effluent gas and SiHCl3 from the sweep gas; and
directing the recycle gas to the polysilicon reactor.
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Abstract
Purified SiHCl3 is used as a sweep gas across a permeate side of a gas separation membrane receiving effluent gas from a polysilicon reactor. The combined sweep gas and permeate is recycled to the reactor.
14 Citations
16 Claims
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1. A method for recycling effluent gas from a polysilicon production reactor, comprising the steps of:
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directing an effluent gas from a polysilicon reactor to a gas separation unit comprising at least one gas separation membrane, said effluent gas comprising SiHCl3, SiCl4, HCl, and H2; directing a sweep gas comprising high purity SiHCl3 to a permeate side of the membrane; recovering a recycle gas from the permeate side, the recycle gas comprising H2 permeated through the membrane from the effluent gas and SiHCl3 from the sweep gas; and directing the recycle gas to the polysilicon reactor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for recycling effluent gas from a polysilicon production reactor, comprising:
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a gas separation unit comprising at least one gas separation membrane, an inlet, a permeate outlet, and a retentate outlet, the inlet being adapted and configured to fluidly communicate with an effluent gas outlet of a polysilicon reactor, the permeate outlet being adapted and configured to fluidly communicate with a reactant feed inlet of the polysilicon reactor; and a SiHCl3 production unit adapted and configured to produce purified SiHCl3 comprising an inlet in fluid communication with the retentate outlet and an outlet in fluid communication with a permeate side of the membrane. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification