Hydrogen chloride for the production of trichlorosilane
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Dear experts, in the production of trichlorosilane, hydrogen chloride, which is a by-product from fertilizer plants, is used as the raw material. What aspects need to be considered when analyzing this raw material? Note: HCL is a by-product of the production of potassium bisulfate, which is obtained by reacting concentrated sulfuric acid with potassium chloride at around 110 degrees Celsius. According to the owner there, the potassium chloride used comes from Canada. Moreover, since this process is carried out under negative pressure, it is possible that poor sealing may allow air to get in.
There is too much oxygen and other impurities; it cannot be used directly. It can be absorbed to form hydrochloric acid, which is then desorbed and condensed to remove impurities, yielding high-purity hydrogen chloride that is used in the synthesis of trichlorosilane.
The oxygen content and impurities inside, as well as the moisture contained in hydrogen chloride
There are too many impurities, which affect the purity of trichlorosilane produced later; it is not very suitable.
The method is costly and uneconomical, with high levels of impurities and moisture.