Method for preparation of low carbon alcohol by hydrogenolysis of sugar and sugar alcohol
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A technology for low-carbon alcohols and sugar alcohols, which is applied in the fields of eliminating hydroxyl groups, chemical instruments and methods, and preparation of hydroxyl compounds, and can solve problems such as difficult separation.
Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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These basic additives are all soluble in water or partially soluble in water, and are difficult to separate from the reaction system; and the use of alkali causes a large amount of lactic acid to be generated in the reaction product
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Embodiment 1
[0016] Prepare a 0.35wt% nickel nitrate solution, and add the required amount of activated carbon based on the metal loading as 10wt%. After stirring evenly, let it stand for 24 hours, then bake it in an oven at 110°C for 12 hours, and then use H in a quartz tube 2 Restore 3h.
Embodiment 2
[0018] The preparation process of catalysts 2-10 was carried out by the method of Example 1, except that the metal components (containing one or two types), mass ratio or carrier were changed. See Table 1 for details.
[0019] Table 1 Catalyst list
[0020] serial number
Embodiment 3
[0021] Embodiment 3: the catalytic hydrocracking reaction of glucose
[0022] The 20wt% glucose solution was transferred to the autoclave, and then 5wt% of the catalyst for the glucose solution and 10wt% of cerium oxide were added. with H 2 Replace 5 times, then fill with 40bar H 2 , heated to 250°C, and reacted for 2h. After the reaction, samples were taken for gas phase and liquid phase analysis, and the results are shown in Table 2.
[0023] Catalytic hydrocracking reaction of table 2 glucose
[0024] Catalyst number
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Abstract
The invention relates to a method for preparation of low carbon alcohol by hydrogenolysis of sugar and sugar alcohol. The method adopts sugar and sugar alcohol as the raw materials, takes one or more than two of iron, cobalt, nickel, copper, zinc, tin, platinum, ruthenium, palladium, iridium and other transition metals as the catalyst active component, and employs a rare earth oxide like promethium oxide, gadolinium oxide, terbium oxide, holmium oxide, erbium oxide, thulium oxide, cerium oxide, lanthanum oxide, praseodymium oxide, neodymium oxide, scandium oxide, yttrium oxide, dysprosium oxide, europium oxide, samarium oxide, ytterbium oxide, lutecium oxide and the like as the assistant. Under a temperature of 150-320DEG C and an H2 pressure of 1-20MPa, catalytic hydrocracking is carried out in a water solution to obtain ethylene glycol, propylene glycol, glycerol and other low carbon alcohols. The method provided by the invention has the advantages that: the rare earth oxide is added as the assistant to realize hydrocracking of sugar and sugar alcohol, rare earth oxides are insoluble in water and easy to separate, and at the end of reaction, the reaction system has no need for additional acid to neutralize.
Description
technical field [0001] The invention relates to the field of chemistry and chemical engineering, in particular to a method for preparing low-carbon alcohols by using rare earth oxides as additives to catalyze the hydrogenolysis of sugar and sugar alcohols. Background technique [0002] Low-carbon alcohols such as ethylene glycol and propylene glycol have a wide range of uses, such as antifreeze, lubricating oil, surfactants and adhesives, etc., especially as monomers for synthetic polyesters such as polyester fibers and polyester resins . However, ethylene glycol and propylene glycol are currently prepared based on petroleum routes, and their preparation routes are obtained through multi-step reactions such as epoxidation and hydration of ethylene and propylene. Petroleum resources are non-renewable and have limited reserves, so it is necessary to develop new preparation methods. Biomass resources are renewable, environmentally friendly and have abundant reserves. A large...
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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/00C07C29/60C07C31/20C07C31/22
CPCC07C29/60
Inventor 徐杰张俊杰路芳蔡嘉莹陈佳志于维强苗虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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