CPC C07C 29/00 (2013.01) [B01J 23/835 (2013.01); B01J 23/888 (2013.01); B01J 23/8885 (2013.01); B01J 25/02 (2013.01); B01J 27/188 (2013.01); B01J 27/19 (2013.01); B01J 35/0006 (2013.01); B01J 37/04 (2013.01); C07C 29/132 (2013.01); C07C 29/60 (2013.01); C07C 31/202 (2013.01); B01J 23/30 (2013.01); B01J 37/0081 (2013.01); B01J 2523/00 (2013.01); Y02P 20/52 (2015.11); Y02P 20/582 (2015.11)] | 30 Claims |
1. A method for preparing a diol, characterized by:
(a) adding an unsupported main catalyst comprising nickel, one or more rare earth elements, tin and aluminium, and optionally i) tungsten, ii) tungsten and molybdenum, or iii) tungsten, molybdenum and boron or phosphorus 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 a soluble tungstic acid salt cocatalyst, hydrogen and a sugar to the slurry bed reactor, wherein the sugar and cocatalyst are fed continuously into the slurry bed reactor in the form of an aqueous sugar solution having a sugar concentration from 20-60 wt % and further comprising the soluble tungstic acid salt cocatalyst to provide gas and a liquid comprising a diol;
(d) continuously passing the gas and reaction liquid out of the reactor through a filter to intercept catalyst; and
(e) separating the diol from the gas and reaction liquid.
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