| abstract |
A process for preparing di-TMP by reacting NBD, formaldehyde and a base comprising reacting NBD, formaldehyde (1) and base (I) to form trimethylolpropane (TMP) and di- A first step of obtaining a reaction mixture solution containing 2-ethyl-2-propenal (ECR), a second step of distilling and recovering ECR from the reaction mixture, and a second step of distilling and recovering (1) to (3), wherein the reaction for producing di-TMP is gradually progressed by continuously adding ECR and addition of at least one of base (II) and formaldehyde Or a process for preparing di-TMP in which TMP is added in a plurality of steps. |