Method for preparing 1, 2-propanediol by adopting jerusalem artichoke as raw material in direct catalytic conversion

A catalytic conversion, propylene glycol technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of poor catalyst stability, difficulty in industrialization, unstable glycerin source, etc., to achieve easy separation and reduce production cost, the effect of contributing to industrial utilization

Active Publication Date: 2015-07-15
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

However, due to the unstable source of glycerol, poor catalyst stability, and harsh reaction conditions, it is difficult to realize the industrialization of the process of hydrogenation of glycerol to 1,2-propanediol.

Method used

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  • Method for preparing 1, 2-propanediol by adopting jerusalem artichoke as raw material in direct catalytic conversion
  • Method for preparing 1, 2-propanediol by adopting jerusalem artichoke as raw material in direct catalytic conversion
  • Method for preparing 1, 2-propanediol by adopting jerusalem artichoke as raw material in direct catalytic conversion

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Experimental program
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Effect test

Embodiment 1

[0019] Catalyst preparation:

[0020] Activated carbon (AC) used in the present invention all adopts mass concentration 20-50% nitric acid 80 ℃ of soaking 24 hours to carry out pretreatment.

[0021] (1) Preparation of isomerization catalysts: unsupported catalysts such as tin tetrachloride are commercial products purchased directly. In the supported catalyst, the active component is loaded on the carrier, and the carrier is a composite carrier of one or more of activated carbon, alumina, silicon oxide, silicon carbide, zirconia, zinc oxide, and titanium dioxide, and chromium, tin, The rhenium metal salt aqueous solution was respectively loaded on the carrier by equal volume impregnation method, then stood for 2 h, dried at 120°C overnight, and then reduced under hydrogen atmosphere.

[0022] Before the above supported catalysts are used, they need to be reduced with hydrogen at a certain temperature for 1h, and in 1%O 2 / N 2 Passivation under (V / V) atmosphere for 4h.

[0...

Embodiment 2

[0029] Catalytic conversion experiment: the reaction was carried out in a batch reactor, 0.5g Jerusalem artichoke, 0.05g isomerization catalyst, 0.3g hydrogenation catalyst, 0.3g C-C bond breaking catalyst and 50ml water were added to a 100ml reactor, and then passed After entering the hydrogen to replace the gas three times, the hydrogen was charged to 6MPa, the temperature was raised to 245°C, and the reaction was carried out for 80min.

[0030] Alternatively, the reaction is carried out in a semi-continuous reactor, 0.5g of Jerusalem artichoke is dissolved in water, and the insoluble matter is filtered off to form 25ml of Jerusalem artichoke aqueous solution, and 0.05g of isomerization catalyst, 0.15g of hydrogenation catalyst, and 0.15g of C-C bond are broken Catalyst and 25ml water join in the 100ml reactor, when reactor temperature was raised to 245 ℃, with the pump speed of 0.5ml / min, 25ml Jerusalem artichoke solution was injected in reactor by pump, reacted 30min.

[0...

Embodiment 3

[0033] Under the action of a small amount of isomerization catalyst and the C-C bond breaking bond catalyst, the influence of different hydrogenation catalysts on the catalytic conversion of Jerusalem artichoke to prepare 1,2-propanediol is shown in Table 1. The feeding method and reaction conditions are the same as in Example 2 in batch A description of the reaction carried out in the reactor.

[0034] Table 1 The reaction results of the catalytic conversion of Jerusalem artichoke to prepare 1,2-propanediol under the action of different hydrogenation catalysts (SnCl 4 0.01g, WO 3 0.01g, hydrogenation catalyst 0.3g, Jerusalem artichoke mass concentration 1%)

[0035]

[0036] As shown in Table 1, under the action of a certain amount of isomerization catalyst and C-C bond breaking catalyst, the yield of 1,2-propanediol and ethylene glycol produced from Jerusalem artichoke is relatively low when the intermittent feeding method of Jerusalem artichoke is adopted. Low, the yi...

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Abstract

The invention relates to a method for preparing 1, 2-propanediol by adopting jerusalem artichoke as raw material in direct catalytic conversion. The method is characterized in that natural biomass Jerusalem artichoke (main component is fructosyl polysaccharide carbonhydrate) is adopted as a raw material, water is used as solvent, metal oxide, metal salt or complex of chromium, tin and rhenium and monomer, oxide, hydrated compound, salt, organic compound and complex of eighth, ninth and tenth transitional metal iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum and tungsten are adopted as composite catalysts, and the 1,2-propanediol can be high-efficiently and high-selectively prepared through the raw material jerusalem artichoke in a high-yield manner under a hydrothermal condition that the temperature is 120DEG C to 300DEG C and the hydrogen pressure is 1MPa to 13MPa through the catalytic conversion process. The reaction raw material is a renewable resource, the method has the advantages that the raw material is cheap and easy to obtain, and the grain and land of the human beings can be prevented from being occupied; moreover, the method has the characteristics of simplicity in pretreatment, no environmental pollution, simplicity for preparing catalyst, moderate reaction condition, good circulating property, easiness for separating the product from the catalyst and the like, and the application prospect is good.

Description

technical field [0001] The invention relates to a method for preparing 1,2-propanediol by chemically catalytically converting Jerusalem artichoke as a raw material, specifically, using a composite catalyst to prepare 1,2-propanediol by catalytically transforming Jerusalem artichoke in one step in a semi-continuous or continuous reactor the process of. Background technique [0002] The demand for energy in countries around the world is gradually increasing, but traditional fossil energy has the problems of resource depletion and environmental pollution. Therefore, the utilization of renewable resources has been widely valued by people. As an important part of renewable resources, biomass resources are an effective carrier of solar energy resources. They have the advantages of wide distribution, sustainable utilization, abundant output and low carbon emissions, and are excellent substitutes for fossil energy. [0003] Jerusalem artichoke, commonly known as "Jianjiang", "Devi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/00
CPCC07C29/00C07C31/205
Inventor 张涛周立坤王爱琴庞纪峰郑明远李昌志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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