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A method for preparing long-chain alkanes by hydrogenation of fatty acids and esters and a catalyst for said method

A technology for long-chain alkanes and fatty acids, which is applied in the field of fatty acids and esters hydrogenation to prepare long-chain alkanes and the catalysts mentioned above, which can solve the problems of easy deactivation of catalysts, severe reaction conditions, and poor water tolerance. Achieve the effects of simple preparation process, short reaction cycle and high tolerance to impurities

Active Publication Date: 2018-10-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology includes two methods: one is the catalytic conversion of sulfur-containing catalysts, which easily leads to sulfur loss and catalyst deactivation, and is generally carried out at 250-400 ° C and 2-8 MPa conditions, and the reaction conditions are very severe. ; The second is the catalytic conversion of metal catalysts in organic systems, the general reaction conditions are 170-270 ° C, 1.5-4 MPa
These systems have poor tolerance to water, and natural fatty acids and esters contain more water

Method used

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  • A method for preparing long-chain alkanes by hydrogenation of fatty acids and esters and a catalyst for said method
  • A method for preparing long-chain alkanes by hydrogenation of fatty acids and esters and a catalyst for said method
  • A method for preparing long-chain alkanes by hydrogenation of fatty acids and esters and a catalyst for said method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1. A metal catalyst loaded on an apatite carrier catalyzes the hydrogenation of stearic acid in water at 60°C in 0.2MPa hydrogen to prepare long-chain alkanes in one step

[0036] Add 1mmol of stearic acid and a metal catalyst loaded on apatite carrier into a 50mL reactor, add 15mL of pure water, pass in 0.2MPa hydrogen, heat to 60°C, and react for 72 hours under stirring conditions Afterwards, cooling, degassing, and filtering are performed to separate the catalyst from the reaction solution, and the reaction solution is diluted with methanol and analyzed by gas chromatography. The gas chromatographic conditions are as follows: GC1690 gas chromatograph, FID detector, capillary column (HP-5, 30m × 0.250mm × 0.25μm), take the temperature program, the initial column temperature is 100 ° C, with a heating rate of 10 ° C / min Raise to 250°C for 3 minutes. The carrier gas is 99.99% high-purity N 2 , the flow rate is 1 mL / min. The gas chromatographic analysis resu...

Embodiment 2

[0039] Example 2. The metal catalyst supported on the apatite carrier catalyzed the hydrogenation of stearic acid in water phase at 180 ° C and 0.2 MPa hydrogen to prepare long-chain alkanes in one step

[0040] Add 1mmol of stearic acid and a metal catalyst loaded on apatite carrier into a 50mL reaction kettle, add 15mL of pure water, pass in 0.2MPa hydrogen, heat to 180°C, and react for 4 hours under stirring conditions Afterwards, cooling, degassing, and filtering are performed to separate the catalyst from the reaction solution, and the reaction solution is diluted with methanol and analyzed by gas chromatography. The gas chromatographic conditions are as follows: GC1690 gas chromatograph, FID detector, capillary column (HP-5, 30m × 0.250mm × 0.25μm), take the temperature program, the initial column temperature is 100 ° C, with a heating rate of 10 ° C / min Raise to 250°C for 3 minutes. The carrier gas is 99.99% high-purity N 2 , the flow rate is 1 mL / min. The gas chro...

Embodiment 3

[0043] Example 3. The metal catalyst supported on the apatite carrier catalyzed the hydrogenation of stearic acid in water phase at 180 ° C and 4 MPa hydrogen to prepare long-chain alkanes in one step

[0044] Add 1mmol of stearic acid and a metal catalyst loaded on apatite carrier into a 50mL reaction kettle, add 15mL of pure water, pass in 4MPa hydrogen, heat to 180°C, and react for 1 hour under stirring , cooling, degassing, and filtering to separate the catalyst from the reaction solution. After the reaction solution was diluted with methanol, it was analyzed by gas chromatography. The gas chromatographic conditions are as follows: GC1690 gas chromatograph, FID detector, capillary column (HP-5, 30m × 0.250mm × 0.25μm), take the temperature program, the initial column temperature is 100 ° C, with a heating rate of 10 ° C / min Raise to 250°C for 3 minutes. The carrier gas is 99.99% high-purity N 2 , the flow rate is 1 mL / min. The gas chromatographic analysis results of t...

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Abstract

The invention provides a method for preparing long-chain alkane by hydrogenating fatty acid and ester and a catalyst for the method. The catalyst for preparing the long-chain alkane by hydrogenating the fatty acid and the ester is a metal catalyst loaded on an apatite carry. The method for preparing the long-chain alkane takes water or alkane to serve as reaction solvent or does not need reaction solvent, and the fatty acid, the ester and hydrogen react to generate the long-chain alkane under the existing condition of the catalyst. Experiments prove that by the method for preparing the long-chain alkane, the conversion rate of the fatty acid and the ester can reach 100%, and the yield of the long-chain alkane can reach 99%. The method is simple in process, simple and convenient in reaction device, quite gentle in reaction condition, high in impurity tolerance, high in catalyst hydrothermal stability, good in reutilization, short in reaction period and suitable for industrial production, water and impurities do not need to be removed before reaction, and complicated separation after reaction is omitted.

Description

technical field [0001] The invention relates to a method for preparing long-chain alkanes through hydrogenation of fatty acids and esters and a catalyst used in the method. Background technique [0002] The current latest biodiesel technology mainly involves the preparation of alkane molecules that can be used as fuel additives or alternative fuels from natural fatty acids and esters. The existing technology includes two methods: one is the catalytic conversion of sulfur-containing catalysts, which can easily lead to sulfur loss and catalyst deactivation, and is generally carried out at 250-400 ° C and 2-8 MPa conditions, and the reaction conditions are very severe. ; The second is the catalytic conversion of metal catalysts in organic systems, the general reaction conditions are 170-270 ° C, 1.5-4MPa. These systems have poor tolerance to water, and natural fatty acids and esters contain more water. [0003] The key technology for the preparation of long-chain alkanes by h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00B01J27/18
CPCY02P30/20
Inventor 张颖许光月郭建华
Owner UNIV OF SCI & TECH OF CHINA