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A kind of method for preparing 1,2-pentanediol from xylose

A technology of pentanediol and xylose, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as difficulty in the source of C5 components, reduce reaction cost and separation difficulty, reduce dosage, The effect of reducing the reaction cost

Active Publication Date: 2018-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of difficult sources of C5 components, the object of the present invention is to provide a method for preparing 1,2-pentanediol in aqueous phase by catalytic hydrogenation using xylose as a raw material

Method used

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  • A kind of method for preparing 1,2-pentanediol from xylose
  • A kind of method for preparing 1,2-pentanediol from xylose
  • A kind of method for preparing 1,2-pentanediol from xylose

Examples

Experimental program
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Effect test

Embodiment 1-6

[0028] Preparation of Silica Supported Rh Catalyst

[0029] Weigh a certain amount of RhCl 3 ·xH 2 O (Rh: 39.5wt%) was added into deionized water and stirred to dissolve, and the amount of water added was determined according to the amount of silicon oxide added. To the above RhCl 3 Add gas-phase nano silicon oxide to the aqueous solution, stir well to form a paste, let stand for 24 hours, and dry at 120°C for 12 hours. Wherein the mass ratio of metal rhodium mass to carrier is X. The catalyst was reduced at 300°C for 2h in a hydrogen atmosphere before use.

[0030] Preparation of Silica Supported Rh Catalyst Modified by Auxiliary M (M=Re, Mo, W)

[0031] Weigh a certain amount of additive precursor into deionized water and stir to dissolve. Add a certain amount of the dried silicon oxide-supported Rh catalyst to the solution, stir well to form a paste, let stand for 24 hours, and dry at 120° C. for 12 hours. Among them, the auxiliary agent precursors are respectively s...

Embodiment 7-10

[0035] RhCl in embodiment 1 3 ·xH 2 O to PdCl 2 , add a small amount of hydrochloric acid during the dissolution process. Other catalyst preparations, additive introduction methods and catalytic reactions are the same as in Example 3, and the reaction results are shown in Table 3.

Embodiment 11-14

[0037] Adopt the commercially purchased Rh / Ac (5wt%) or Pd / Ac (5wt%) catalyst to replace the Rh / SiO prepared in embodiment 3 2 catalyst. The auxiliary agent introduction method and catalytic reaction conditions are the same as in Example 3, and the reaction results are shown in Table 1.

[0038] Table 1 Effect of catalyst composition on xylose hydrogenation performance

[0039]

[0040]

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Abstract

The invention discloses a method for preparing 1,2-pentanediol by catalytic hydrogenation using xylose as a raw material. The method adopts a loaded Rh or Pd-based hydrogenation catalyst and uses water as a solvent in a hydrogen atmosphere of 0.5-10MPa. In the process, xylose is converted into 1,2-pentanediol at a temperature of 80-180°C. Xylose is a biomass resource with a wide range of sources. The present invention uses xylose as a raw material to solve the problem of C5 component The problem of difficult sources, and the xylose aqueous solution adopted in the present invention can be the hydrolyzate of corn cob, bagasse, cottonseed hulls, etc., which can further reduce the production cost, and the highest yield can reach 46%.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a technical route for preparing 1,2-pentanediol by catalytic hydrogenation using xylose as a raw material. Background technique [0002] 1,2-Pentanediol is a linear diol with a wide range of uses. Due to its obvious polarity and nonpolarity, it has different properties from other diols. 1,2-pentanediol can be used to prepare pharmaceutical products, surfactants and polyester fibers, etc. 1,2-pentanediol has excellent antibacterial, moisturizing and compatibilizing properties, and can effectively improve the water resistance of sunscreen products, so it is widely used in the field of cosmetics. 1,2-pentanediol is also the key raw material of the fungicide propiconazole. [0003] At present, 1,2-pentanediol is mainly prepared from C5 fractions in the petrochemical industry as raw materials. U.S. Patents US4479021, US4605795 and Chinese Patent CN1552684A report the preparation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/141B01J23/46B01J23/652B01J23/44
Inventor 徐杰杨艳良马继平苗虹路芳高进
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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