Discuss whether silane gas can be directly produced by the hydrogenation and reduction of chlorosilanes
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Is there an industrial production process that directly hydrogenates various chlorosilanes (including DCS, TCS, and STC) to produce silane gas (a catalyst may be required)?
It still needs to be analyzed from an economic perspective; it’s definitely not as cost-effective as producing silane directly
I wonder if such technology exists nowadays...
The UCC in the United States uses a cold hydrogenation process to produce trichlorosilane, which is then converted from TCS to DCS, and subsequently to silanes. Silanes can be produced from either STC\TCS\DCS, but regardless of the chlorosilane used, the process products will contain STC\TCS\DCS
Specifically? What are the basic parameters? Temperature range? Pressure range? Catalyst? Reactor structure? Could you talk about it?
Just saw it; brief reply: The reactor is a distillation tower reactor. Conversion of TCS to DCS: Temperature at 80 degrees, pressure > 3.5 BAR (depending on the cooling medium used; here it refers to 35 degrees circulating cooling water). Conversion of DCS to SIH4: temperature at 50 degrees, pressure at 40 BAR.
Is no catalyst required for the conversion of DCS to SiH4? ?
It is definitely necessary. One reason for such a low temperature is the need to take into account the maximum operating temperature limit of the catalyst
For ordinary catalysts (as long as they are not enzyme-catalyzed), the optimal activity temperature is usually in the hundreds of degrees; what type of catalyst is one whose operating temperature is only 50 degrees.................................
I have heard of this technology, which involves the reaction of silicon tetrachloride with metal hydrides. The reaction proceeds quite rapidly and must take place at extremely low temperatures; the silane gas produced is of very high purity. Experts in China have conducted successful experiments in this area.