PROCESS FOR HIGHLY EFFICIENT CATALYTIC CONVERSION OF CELLULOSE RAW MATERIAL TO DIOL

摘要

This invention provides a method for highly efficient catalytic conversion of cellulosic raw materials to glycols. In the process, cellulosic compounds such as crop stalk, wood powder and etc., as feedstock are subjected to one-step catalytic conversion with a ternary composite catalyst composed of organic acid or inorganic acid which does not contain tungsten, a transition metal from Groups 8, 9 or 10 such as iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum, or a mixture thereof, and a tungsten oxide, a tungsten sulfide, a tungsten chloride, a tungsten hydroxide, tungsten bronze, tungstic acid, a tungstate, a metatungstate acid, a metatungstate, a paratungstate acid, a paratungstate, a peroxotungstic acid, pertungstate and heteropoly tungstate, or a mixture thereof. The reaction is carried out under hydrothermal conditions at a temperature between 120-300° C. with hydrogen pressure between 1-13 MPa.

主权项

1. A method for producing glycols from cellulosic feedstock with high efficiency, wherein, cellulosic biomass is used as feedstock and put in the autoclave with water for the catalytic hydrogenation reaction with catalysts;
said catalyst is a composite catalyst, comprising catalyst A, catalyst B and catalyst C; the catalyst A is organic acid or inorganic acid which does not contain tungsten element; the active ingredient of catalyst B is one or more transition metals selected from metallic iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum of Groups 8, 9 or 10 elements, or a mixture thereof; the active ingredient of catalyst C is one or more selected from metallic tungsten, tungsten nitride, tungsten carbide, tungsten phosphide, tungsten oxide, tungsten sulfide, tungsten chloride, tungsten hydroxide, tungsten bronze oxide, tungstic acid, tungstate, metatungstate acid, metatungstate, paratungstate acid, paratungstate, peroxotungstic acid, pertungstate and heteropoly tungstate; the reaction is carried out in an autoclave with stifling and hydrogen is charged into the reactor before reaction; the reaction is performed at temperatures not lower than 120° C. for no less than 5 min; said weight concentration of the catalyst A in the reaction system is between 0.0001% and 5%, and the weight ratio of the metallic active ingredient of catalyst B to the active ingredient of catalyst C (based on the weight of tungsten element) is between 0.02 and 3000.