Patent ID: 8334399
Filing Date: 2012-12-18
Classification: C07C

Abstract:
1. A process for preparing acetone cyanohydrin, comprising: A. contacting acetone and hydrocyanic acid in the absence of a metal cyanide composition in a reactor to give a reaction mixture, the reaction mixture being circulated, to obtain acetone cyanohydrin; B. cooling at least 70% by weight of the reaction mixture by flowing said at least 70% by weight of said reaction mixture through a cooling region of a cooler, the cooler including one cooling element or at least two cooling elements; wherein a residence time of the reaction mixture in the cooler is in a range of from 0.1 h to 2 h; and C. discharging at least a portion of the acetone cyanohydrin obtained from the reactor, wherein the volume of the cooling region of the cooler based on the total internal volume of the cooler is greater than the volume of the cooling element or of the at least two cooling elements of the cooler.