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Method for preparing liquid fuel by step-by-step deoxidization of grease

A technology for liquid fuels and oils, applied in the field of oil deoxidation to prepare liquid fuels, can solve the problems of high cost of precious metal catalysts and harsh reaction conditions, and achieve the effects of reducing hydrogen consumption, reducing material consumption, and increasing production and added value.

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a method for the preparation of liquid fuel by step-by-step deoxygenation of grease, to overcome the problems of high cost and harsh reaction conditions of the noble metal catalyst used in the existing method for preparing liquid fuel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Sodium methoxide (0.5% of the oil quality) catalyzed refined soybean oil and methanol (alcohol-oil molar ratio: 6:1) reacted at 60°C for 2 hours to esterify the oil. After separation, the content of fatty acid methyl ester was 97%.

[0035] Fatty acid methyl esters are catalyzed by a tubular reactor filled with a commercial copper-zinc-aluminum hydrogenation catalyst for hydrogenation reaction. The process conditions are: 180°C, 6MPa, the molar ratio of hydrogen to fatty acid methyl esters is 20:1, and the volume space velocity is 0.4 h -1 . Fatty alcohol content obtained by catalytic hydrogenation of fatty acid methyl ester reaches 98%.

[0036] In the tubular reactor filled with ZSM-35 molecular sieve catalyst, the process conditions of fatty alcohol dehydration isomerization are 240°C, 0.1MPa, and the volume space velocity of fatty alcohol is 0.3h -1 . The reaction gives C 6 -C 18 The isoolefin content reaches 96% of the liquid fuel.

Embodiment 2

[0038] React rubber seed oil with an acid value of 30mgKOH / g with methanol at 240°C for 1 hour to esterify the oil. After methanol is separated and recovered, the content of fatty acid methyl ester is 90%.

[0039] Fatty acid methyl esters are catalyzed by a tubular reactor filled with a commercial copper-chromium catalyst for hydrogenation reaction. The process conditions are: 280°C, 2MPa, the molar ratio of hydrogen to fatty acid methyl esters is 5:1, and the volume space velocity is 2h -1 . Fatty alcohol content obtained by catalytic hydrogenation of fatty acid methyl ester reaches 92%.

[0040] In the tower reactor filled with ZSM-5 molecular sieve catalyst, the process conditions of fatty alcohol dehydration / isomerization reaction are 190°C, 0.2MPa, and the volume space velocity of fatty alcohol is 1.6h -1 . The reaction gives C 6 -C 18 The isoolefin content reaches 90% of the liquid fuel.

Embodiment 3

[0042] ZSM-5 acidic molecular sieve catalyzes the reaction of rancid catering industry waste oil with methanol at 160°C for 2 hours to esterify the oil methyl. After separation, the fatty acid methyl ester content was 92%.

[0043] Fatty acid methyl esters are catalyzed by a tubular reactor filled with commercial copper-zinc-aluminum catalysts for hydrogenation reaction. The process conditions are: 210°C, 4MPa, the molar ratio of hydrogen to fatty acid methyl esters is 8:1, and the volume space velocity is 1h -1 . Fatty alcohol content obtained by catalytic hydrogenation of fatty acid methyl ester reaches 95%.

[0044] In the tubular reactor filled with ZSM-22 molecular sieve catalyst, the process conditions of fatty alcohol dehydration / isomerization reaction are 200°C, 0.3MPa, and the volume space velocity of fatty alcohol is 0.8h -1 . The reaction gives C 6 -C 18 The isoolefin content reaches 86% of the liquid fuel.

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Abstract

The invention discloses a method for preparing liquid fuel by step-by-step deoxidization of grease. The method comprises the following steps: (1) the grease is converted into fatty acid methyl ester by methyl esterification; (2) fatty acid methyl ester and hydrogen are converted into fatty alcohol under the action of a copper-based catalyst; (3) fatty alcohol is subjected to dehydration / isomerization under the action of a molecular sieve based catalyst, and olefins are prepared, wherein the content of isomerized olefins in olefins is higher than 86%, reaction temperature is 190-240 DEG C, absolute pressure of the reaction is 0.1-0.5 MPa, the volume space velocity of fatty alcohol is 0.2-3 h<-1>, and the molecular sieve based catalyst is one or more of ZSM-35, ZSM-5, ZSM-22, SAPO-31, SAPO-11, a Y molecular sieve, a beta molecular sieve and mordenite. The method for preparing the liquid fuel has the advantages that the catalysts are cheap and easily available, hydrogen consumption is reduced remarkably, glycerin yield is increased, and the like.

Description

technical field [0001] The invention relates to a method for preparing liquid fuel through deoxygenation of grease, belonging to the technical field of biomass energy. More specifically, it relates to the preparation of liquid fuel by methyl esterification, hydrogenation, dehydration / isomerization and step-by-step deoxygenation of fats and oils. Background technique [0002] Liquid fuels, such as gasoline, diesel, aviation fuel, etc., are very important power fuels and an important material basis for economic and social development. The long-term extensive use of liquid fuels prepared from fossil resources has had negative impacts on the environment such as the greenhouse effect. Moreover, the reserves of these non-renewable resources will decrease year by year with continuous consumption. The liquid fuel prepared by the deoxygenation of renewable animal and vegetable oils has high calorific value, good combustion performance, similar composition and good compatibility wit...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCC10G3/44C10G3/50C10G2300/1011Y02P30/20
Inventor 张家仁李建忠师为炬何皓侯丹齐泮仑李萌萌张佳雪晶孙立明
Owner PETROCHINA CO LTD
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