Method for preparing 1,2-pentanediol from xylose

A technology of pentanediol and xylose, 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 cost, The effect of short routes

Active Publication Date: 2016-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of difficult sources of C5 components, the object of the present invention is to provi

Method used

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  • Method for preparing 1,2-pentanediol from xylose
  • Method for preparing 1,2-pentanediol from xylose
  • Method for preparing 1,2-pentanediol from xylose

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1-6

[0028] Preparation of silica supported Rh catalyst

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

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

[0031] Weigh a certain amount of the auxiliary agent precursor into deionized water and stir to dissolve. Add a certain amount of the above-mentioned dried silica supported Rh catalyst to the solution, fully stir it into a paste, stand for 24 hours, and dry at 120°C for 12 hours. Among them, the auxiliary agent pre...

Example Embodiment

[0034] Example 7-10

[0035] The RhCl in Example 1 3 ·XH 2 O changed to PdCl 2 , Add a small amount of hydrochloric acid during the dissolution process. Other catalyst preparation, auxiliary agent introduction methods and catalytic reactions are the same as in Example 3. The reaction results are shown in Table 3.

Example Embodiment

[0036] Examples 11-14

[0037] Commercially purchased Rh / Ac (5wt%) or Pd / Ac (5wt%) catalyst was used instead of the Rh / SiO prepared in Example 3. 2 catalyst. The method of introducing the auxiliary agent and the conditions of the catalytic reaction are the same as in Example 3. The reaction results are shown in Table 1.

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

[0039]

[0040]

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Abstract

The present invention discloses a method for preparing 1,2-pentanediol by using xylose as a raw material through catalytic hydrogenation. According to the method, a supported Rh or Pd based hydrogenation catalyst is used, water is adopted as a solvent, and xylose is converted at a temperature of 80-180 DEG C in a 0.5-10 MPa hydrogen atmosphere to generate 1,2-pentanediol, wherein xylose is a biomass resource with the wide source. According to the present invention, the xylose is adopted as the raw material so as to well solve the problem of the difficult source of the C5 component; and the used xylose aqueous solution can be the hydrolyzate of corn cobs, bagasse, cotton seed hulls and the like, such that the production cost can be further reduced, and the maximum yield can achieve 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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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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