Patent ID: 8981161
Filing Date: 2015-03-17
Classification: C07C

Abstract:
1. A method for producing ditrimethylolpropane by reacting n-butyl aldehyde (“NBD”), formaldehyde and a base, the method comprising the following steps: reacting the n-butyl aldehyde, a first formaldehyde and a first base to obtain a reaction mixture comprising trimethylolpropane (“TMP”), ditrimethylolpropane (“di-TMP”) and 2-ethyl-2-propenal (“ECR”); distilling the reaction mixture to recover the 2-ethyl-2-propenal therefrom; and sequentially or simultaneously adding to the reaction mixture from which the 2-ethyl-2-propenal has been recovered by the distillation the 2-ethyl-2-propenal recovered by the distillation and at least one of a second base or a second formaldehyde, and thereby proceeding the reaction gradually for production of the ditrimethylolpropane, and adding during any one or more of said reacting, distilling or sequentially or simultaneously adding step(s) a total amount of trimethylolpropane ranging from 0.1 to 2.0 equivalents per 1.0 mol of the n-butyl aldehyde; thereby producing ditrimethylolpropane.