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Method for preparing long-chain alkane fuel by catalyzing fatty acids or fatty acid esters by hydrodeoxygenation

A fatty acid ester and hydrodeoxygenation technology, which is applied in the preparation of liquid hydrocarbon mixtures, biological raw materials, petroleum industry, etc., can solve the problems of difficult separation of reaction products and systems, chain scission loss of alkane products, and low catalytic efficiency. Achieve the effect of easy separation, low energy consumption and easy realization

Inactive Publication Date: 2016-10-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned reactions of fatty acids and fatty acid esters to prepare alkanes by hydrodeoxygenation all use organic solvents as the reaction medium, and the reaction temperature is high, which easily leads to chain scission loss of alkanes products, and the catalytic efficiency is not high, and the reaction products are difficult to separate from the system.

Method used

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  • Method for preparing long-chain alkane fuel by catalyzing fatty acids or fatty acid esters by hydrodeoxygenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of long-chain alkane fuel by ruthenium-catalyzed hydrogenation-deoxygenation of methyl stearate.

[0022] In 80mL stainless steel autoclave, add methyl stearate (200mg, 0.67mmol), catalyst Ru / HZSM-5 (150mg, Ru 1.0wt.%, Si / Al=25), H 2 O (10mL) with H 2 H 2 After the pressure was raised to 3.0 MPa to ensure that the autoclave was airtight, it was placed in a heating mantle at 200° C. and stirred for 8 hours. During the reaction, the maximum pressure in the kettle can reach about 6MPa; after the reaction is completed, the pressure in the kettle will drop to about 3MPa after cooling to room temperature.

[0023] The reaction solution was extracted with cyclohexane, and the extracted organic phase was analyzed and quantified by gas-mass mass. The analysis results showed that the conversion rate of methyl stearate was 91%, the yield rate of heptadecane was 64%, the yield rate of octadecane was 13%, and the yield rate of stearic acid was 0%.

Embodiment 2

[0030] Example 2: Platinum-catalyzed hydrogenation-deoxygenation of methyl stearate to prepare long-chain alkane fuels.

[0031] In 80mL stainless steel autoclave, add methyl stearate (200mg, 0.67mmol), catalyst Pt / HZSM-5 (150mg, Pt 1.0wt.%, Si / Al=25), H 2 O (10mL) with H 2 H 2 After the pressure was raised to 3.0 MPa to ensure that the autoclave was airtight, it was placed in a heating mantle at 200° C. and stirred for 8 hours. During the reaction, the maximum pressure in the kettle can reach about 6MPa; after the reaction is completed, the pressure in the kettle will drop to about 3MPa after cooling to room temperature.

[0032] The reaction solution was extracted with cyclohexane, and the extracted organic phase was analyzed and quantified by gas-mass mass. The analysis results showed that the conversion rate of methyl stearate was 81%, the yield rate of heptadecane was 0%, the yield rate of octadecane was 1%, and the yield rate of stearic acid was 69%.

Embodiment 3

[0033] Example 3: Preparation of long-chain alkane fuel by ruthenium-catalyzed hydrogenation-deoxygenation of methyl stearate.

[0034] In 80mL stainless steel autoclave, add methyl stearate (200mg, 0.67mmol), catalyst Ru / HZSM-5 (150mg, Ru 1.0wt.%, Si / Al=25), H 2 O (10mL) with H 2 H 2 After the pressure was raised to 3.0 MPa to ensure that the autoclave was airtight, it was placed in a heating mantle at 180° C. and stirred for 8 hours. During the reaction, the pressure inside the kettle can reach up to about 5.5MPa; after the reaction is finished, cool to room temperature, and the pressure inside the kettle drops to about 3MPa.

[0035] The reaction solution was extracted with cyclohexane, and the extracted organic phase was analyzed and quantified by gas-mass mass. The analysis results showed that the conversion rate of methyl stearate was 24%, the yield rate of heptadecane was 17%, the yield rate of octadecane was 2%, and the yield rate of stearic acid was 0%.

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Abstract

The invention discloses a method for preparing long-chain alkane fuel by catalyzing fatty acids or fatty acid esters by hydrodeoxygenation. In the presence of hydrogen, in an aqueous phase or organic phase and in a closed high-pressure kettle, an acid-metal bifunctional catalyst having an acid center and a silicon-aluminum ratio of 25 and formed by supporting metal nanoparticles with molecular sieve HZSM-5 as a support is used as a catalyst to catalyze fatty acids or fatty acid esters to prepare long-chain alkane fuel by hydrodeoxygenation; water is used as a reaction medium, ensuring economy and environmental friendliness and high catalytic efficiency, reaction conditions are mild, the method is easy, resources are saved, energy consumption can be reduced, product and water mutual dissolution is zero after reacting, isolating is easy, the catalyst is recyclable, and it is possible to control the ratio of the products heptadecane and octadecane by controlling the conditions such as the reaction medium and reaction temperature.

Description

Technical field: [0001] The invention relates to a method for preparing long-chain alkane fuel by catalyzing the hydrodeoxygenation of fatty acid or fatty acid ester. Background technique: [0002] As a renewable and clean biomass energy, biodiesel is very close to petrochemical diesel in physical properties and is the best substitute for petrochemical diesel. Among them, the first-generation biodiesel refers to fatty acid monoalkyl esters obtained by transesterification of animal and vegetable oils (fatty acid triglycerides) and alcohols (methanol or ethanol), the most typical being fatty acid methyl esters. However, due to the disadvantages of high oxygen content, relatively low calorific value, and a large amount of waste water containing acid, alkali and grease during production, the application is greatly restricted. The second-generation biodiesel is alkane similar to diesel components obtained through hydrodeoxygenation and isomerization of the first-generation biodi...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20C10G3/44
Inventor 许齐勇郭园园陈金铸
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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