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A method for selectively preparing propylene glycol from sugar-containing compounds

A technology for propylene glycol and compounds, which is applied in the field of selective preparation of propylene glycol, can solve problems such as impracticability, and achieve the effects of low cost, convenient use, and high atom economy

Active Publication Date: 2015-12-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the current method is still unable to achieve effective regulation of the product yield distribution of ethylene glycol and 1,2-propanediol

Method used

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  • A method for selectively preparing propylene glycol from sugar-containing compounds
  • A method for selectively preparing propylene glycol from sugar-containing compounds
  • A method for selectively preparing propylene glycol from sugar-containing compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of activated carbon with basic functional groups: Soak the activated carbon with 10% KOH at a mass concentration of 80°C, dry it, and roast it in an inert atmosphere at 600°C for 1 hour to obtain AC-base for use.

[0030] Preparation of metal catalysts: impregnate activated carbon supports with basic functional groups with aqueous solutions of nickel nitrate, chloroplatinic acid, and ruthenium trichloride, dry at 120°C for 12h, and then reduce them in a hydrogen atmosphere at 450°C for 1h to obtain catalysts Ni / AC-base(5wt%Ni), Pt / AC-base(0.5wt%Pt), Ru / AC-base(5wt%Ru). Replace the basic activated carbon support with CaO, ZnO, Cs 2 O, La 2 o 3 , BaO, the same method can produce 5%Ru / CaO, 5%Ru / ZnO, 5%Ru / Cs 2 O, 5%Ru / La 2 o 3 , 5%Ru / BaO, 5%Ru / CaO catalyst; dilute the ruthenium trichloride solution 5 times, the same method can get 1%Ru / ZnO catalyst.

[0031] Other metals and catalysts with different loads used in the following examples were prepared by imp...

Embodiment 2

[0033] Cellulose catalytic conversion experiment: Add 1.0g cellulose, 0.3g metal ruthenium catalyst supported by alkaline carrier, 0.1g tungstic acid catalyst, 100ml water into a 200ml reactor, replace the gas with hydrogen gas three times, and fill it with hydrogen gas to 5MPa , be warming up to 240 DEG C of reaction 30min. After the reaction, cool down to room temperature, take the centrifuged supernatant, separate it on a high-performance liquid chromatography calcium-type ion-exchange column and detect it with a differential refraction detector. In the product yield, only the target products ethylene glycol, propylene glycol and hexahydric alcohols (including sorbitol and mannitol) are calculated, and other liquid products include butylene glycol, ethanol, unknown components, and gas products (CO 2 , CH 4 , C 2 h 6 etc.) The yield was not calculated.

[0034] The catalytic conversion results of cellulose on various composite catalysts are shown below (Table 1).

[003...

Embodiment 3

[0039] Add 5.0g of sugar-containing compound, 1.0g of 1%Ru / ZnO catalyst, 0.8g of tungstic acid catalyst, and 100ml of water into a 200ml reaction kettle, replace the gas with hydrogen for three times, fill with hydrogen to 5MPa, and heat up to 240°C for 30min . The catalytic conversion results of various sugar-containing compounds are shown below (Table 2).

[0040] Table 2 Results of catalytic conversion of various sugar-containing compounds on Ru / ZnO+tungstic acid catalyst

[0041]

[0042] As shown in Table 2, various sugar-containing compounds can be converted into propylene glycol with high selectivity in the catalytic process involved in the present invention.

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Abstract

The present invention provides a method for highly-selectively preparing propylene glycol from a sugar-containing compound, wherein the sugar-containing compound comprises cellulose, starch, hemicellulose, sucrose, glucose, fructose, fructosan, xylose, and soluble xylooligosaccharide. According to the method, the sugar-containing compound is adopted as a reaction raw material, a three-component composite catalyst is adopted, and a one-step catalytic conversion process is performed at a temperature of 120-300 DEG C under hydrogen pressure of 0.1-15 MPa to achieve high performance, high selectivity and high yield preparation of propylene glycol from the sugar-containing compound, wherein active components of the catalyst comprise one or more than two materials selected from 8, 9, and 10 group transition metals such as iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum, one or more than two materials selected from an inorganic compound of tungsten, an organic compound of tungsten, a complex of tungsten and elementary tungsten, and one or more than two materials selected from an oxide of an alkali metal or an alkaline earth metal, a hydroxide of an alkali metal or an alkaline earth, an alkaline salt of an alkaline metal or an alkaline earth metal, aluminium hydroxide, zinc oxide, and zinc hydroxide.

Description

technical field [0001] The invention relates to a method for selectively preparing propylene glycol, in particular to a reaction process for selectively preparing propylene glycol through one-step catalytic hydrogenation degradation of sugar-containing compounds under alkaline hydrothermal conditions. Background technique [0002] Ethylene glycol and propylene glycol are important energy liquid fuels, and are also very important raw materials for polyester synthesis. For example, ethylene glycol can be used in polyethylene terephthalate (PET), polyethylene naphthalate (PEN ), can also be used as antifreeze, lubricant, plasticizer, surfactant, etc.; propylene glycol can be used to produce unsaturated polyester, epoxy resin, polyurethane resin, and is also widely used as a hygroscopic agent in the food, pharmaceutical and cosmetic industries agents, antifreeze, lubricants and solvents. They are widely used organic chemical raw materials. [0003] At present, the industrial p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C31/26C07C29/00B01J23/652B01J27/188B01J23/888
Inventor 邰志军张涛郑明远庞纪峰姜宇张军营王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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