TH102705A - Chlorosilane aqueous decomposition - Google Patents

Abstract

DC60 (26/10/58) Chlorosilane is hydrolyzed to obtain the hydrolysis product in a cyclic system consisting of a hydrolysis reactor, an HCl purifier, a wash route and a separator. The steps of the method comprise (i) feeding the chlorosilane from an external source into the hydrolysis reactor, (ii) feeding water from an external source into the wash route, (iii) feeding a high concentration of aqueous HCl, at least 10 wt % of HCl, from an external source into the hydrolysis reactor between the wash route and the hydrolysis reactor, (iv) removing anhydrous hydrogen chloride from the HCl purifier, (v) removing the hydrolysis product from the wash route, and (vi) removing a low concentration of aqueous HCl, 0.1 to less than 10 wt % of HCl, from the cyclic system. 2015/10/02 10:00 AM UPDATE TO SUMMARY OF INVENTION 26/10/2015 Chlorosilane is hydrolyzed to obtain hydrolysis products in a cyclic system comprising a hydrolysis reactor, an HCl purifier, a wash route, and a separator. The steps of the method comprise (i) feeding chlorosilane from an external source into the hydrolysis reactor, (ii) feeding water from an external source into the wash route, (iii) feeding a high concentration of aqueous HCl, at least 10 wt % of HCl, from an external source into the hydrolysis reactor between the wash route and the hydrolysis reactor, (iv) removing anhydrous hydrogen chloride from the HCl purifier, (v) removing the hydrolysis product from the wash route, and (vi) removing a low concentration of aqueous HCl, 0.1 to less than 10 wt % of HCl, from the cyclic system. ---------------------------------------------------------------------------

Claims (1)

Updated 26/10/2015 1. Method of hydrolysis of chlorosilane to obtain hydrolysis compounds in a cyclic system consisting of a hydrolysis reactor, HCl purifier, washing path and separator. The method consists of (i) feeding chlorosilane from an external source into the hydrolysis reactor, where the hydrolysis reaction occurs and produces a mixture of hydrolysis compounds, liquid aqueous HCl and HCl vapor; (ii) passing the hydrolysis compounds, liquid aqueous HCl and HCl vapor produced in (i) through the HCl purifier, where anhydrous hydrogen chloride is removed from the mixture and the cyclic system; (iii) passing the hydrolysis compounds, liquid aqueous HCl and HCl from the purifier. (iv) Recovering the aqueous HCl from (iii) to the hydrolysis reactor; (v) Feeding the aqueous hydrolysis concentrate from (iii) into the washing path; (vi) Feeding external water into the washing path to purify the aqueous hydrolysis concentrate; (vii) Removing the purified aqueous hydrolysis concentrate from the washing path and cyclic system; (viii) Recovering the low concentration aqueous HCl from the washing path to the hydrolysis reactor; (ix) Removing the low concentration aqueous HCl from the washing path and cyclic system, where the low concentration aqueous HCl is 0.1% to less than 10% by weight; and (x) Feeding the high concentration aqueous HCl. At least 10% by weight of HCl from an external source enters the hydrolysis reactor.