Patent ID: 9051536
Filing Date: 2015-06-09
Classification: C12C

Abstract:
1. A process for the direct hydrogenation of hop resin acids which comprises contacting an undiluted, solvent-free mixture of isomerized hop resin acids, in their naturally acid state, with hydrogen gas in the presence of a noble metal catalyst, wherein the hydrogenation proceeds by contacting said reaction mixture of hop resin acids with hydrogen gas in the presence of a noble metal catalyst under partial pressure of carbon dioxide (CO 2 ), the pressure of said CO 2 gas being (a) sufficient to fluidise said reaction mixture, and (b) below that at which the said CO 2 gas will liquefy at below the critical temperature for CO 2 , or at pressure less than that at which the density of the CO 2 gas exceeds its value at the critical point if the temperature is at or above the said critical temperature.