Methods for preparing diol
AssigneesChangchun Meihe Science and Technology Development Co., Ltd., The Coca-Cola Company
InventorsJing Liu, Hongbin Qi, Haiyu Ren, Indra Prakash, Yu Shi
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Abstract
Provided is a method for preparing a diol. In the method, a saccharide and hydrogen as raw materials are contacted with a catalyst in water to prepare the diol. The employed catalyst is a composite catalyst comprised of a main catalyst and a cocatalyst, wherein the main catalyst is a water-insoluble acid-resistant alloy; and the cocatalyst is a soluble tungstate and/or soluble tungsten compound. The method uses an acid-resistant, inexpensive and stable alloy needless of a support as a main catalyst, and can guarantee a high yield of the diol in the case where the production cost is relatively low.
Claims13
A method for preparing a diol, the method comprising:
- (a) adding a main catalyst comprising nickel, one or more rare earth elements, tin and aluminum;
- and a cocatalyst comprising an insoluble tungsten compound to a slurry bed reactor;
- (b) increasing the reaction system pressure to 5-12 MPa and the reaction temperature to 150-260° C.;
- (c) adding hydrogen and sugar to the slurry bed reactor, wherein the sugar is fed continuously into the slurry bed reactor in the form of an aqueous sugar solution having a sugar concentration of 20-60 wt % to provide gas and a reaction liquid comprising a diol;
- (d) continuously passing the gas and reaction liquid out of the reactor through a filter to intercept the catalyst;
- and
- (e) separating the diol from the gas and reaction liquid.
Dependencies are inferred from the claim text.