Method for preparing 1,3-propanediol with high space-time yield and high concentration

Abstract

A method for preparing 1,3-propanediol with a high space-time yield, in which A methyl 3-hydroxypropionate solution is pumped into a tubular fixed-bed reactor loaded with a surface modifier-coated nano-Cu-based catalyst for continuous hydrogenation to obtain a reaction mixture, where the catalyst includes Cu as active component, a metal oxide XOas additive and a SiO—SnOcomposite carrier. The reaction mixture is subjected to rectification to separate light components from heavy components, where the light components include methanol, n-propanol, methyl propionate, methyl 3-hydroxypropionate and 1,3-propanediol, and the heavy components include 1,3-propanediol mono-propionate and 1,3-propanediol mono-3-hydroxypropionate. The heavy components are fed back to the tubular fixed-bed reactor for secondary hydrogenation, and the light components are separated to obtain 1,3-propanediol.