Patent ID: 7307179
Filing Date: 2007-12-11
Classification: C07F

Abstract:
1. A process for preparing cyclic organohydrogensiloxanes comprising: (A) contacting a silane of the formula RHSiCl 2 , where R is selected from alkyl radicals having 1 to 12 carbon atoms and aryl radicals, with water to form a hydrolyzate comprising cyclic organohydrogensiloxanes and linear organohydrogensiloxanes, and (B) contacting the hydrolyzate with an acidic rearrangement catalyst in the presence of an inert liquid diluent to increase the ratio of the cyclic organohydrogensiloxanes to linear organohydrogensiloxanes in the hydrolyzate, characterised in that the acidic rearrangement catalyst is an organic compound containing a strong acid group which is dissolved in the inert diluent present.