Patent ID: 7208617
Filing Date: 2007-04-24
Classification: C08G

Abstract:
1. A method of hydrolyzing chlorosilanes to produce a hydrolysate in a looped system containing a hydrolysis reactor, an HCl purifier, a wash means, and a separator. the method comprising: (i) feeding chiorosilanes from an external source to a hydrolysis reactor where a hydrolysis reaction occurs and produces a mixture containing a liquid hydrolysate, aqueous HCl, and HCl vapor; (ii) passing liquid hydrolysate, aqueous HCl, and HCl vapor produced in (i) through an HCl purifier where anhydrous hydrogen chloride is removed from the mixture and the looped system; (iii) passing liquid hydrolysate and aqueous HCl from the HCl purifier into a separator where liquid hydrolysate is separated from aqueous HCl; (iv) returning aqueous HCl from (iii) to the hydrolysis reactor; (v) feeding liquid hydrolyzate from (iii) into a wash means; (vi) feeding water from an external source into the wash means to purify the liquid hydrolyzate; (vii) removing purified liquid hydrolysate from the wash means and the looped system; (viii) returning low concentration aqueous HCl from the wash means to the hydrolysis reactor; (ix) removing low concentration aqueous HCl from the wash means and the looped system, wherein the low concentration aqueous HCl is at a concentration of 0.1 to less than 10 percent by weight; and (x) feeding high concentration aqueous HCl of at least 10 percent by weight HCl from an external source to the hydrolysis reactor.