The boring equilibrium problem of cold hydrogenation

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This post was last edited by wangli115 on 2011-7-3 09:48. Theoretically, within the cycle of cold hydrogenation, distillation, reduction, and off-gas recovery, chlorine atoms are not consumed; however, in actual production, factors such as displacement, hydrolysis, residue removal, and metal impurities in silicon powder result in a significant loss of chloride ions. This portion of chloride ions that is consumed needs to be replenished from outside; currently, the common practice is to purchase high-purity STC in order to maintain chlorine balance in the system. Based on current synthesis calculations, when silicon powder reacts with HCL, the utilization rate of chlorine atoms is around 80%. 1: Does anyone know how much STC needs to be purchased for the chlorination process to produce, for example, 100,000 tons of trichlorosilane per year? 2: If everything is switched to cold hydrogenation, STC will no longer be available; in that case, TCS or HCL will have to be used to maintain the chlorine balance. By how much will the cost of cold hydrogenation increase?