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Preparation method for aviation kerosene

A technology of aviation kerosene and lignocellulose, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, biological raw materials, etc., and can solve the problems of reduced equipment efficiency, high cost, and high freezing point

Active Publication Date: 2014-05-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are following problems in this route: 1) hydroxymethylfurfural or furfural and acetone aldol condensation product contain monopolymerization and dimerization product simultaneously
2) The alkanes synthesized by this method are all straight-chain alkanes, and the freezing points of these hydrocarbons are relatively high (n-pentadecane: 8.5~10°C; n-tetradecane: 5.8°C; n-tridecane: -5.5°C; n-tridecane: -5.5°C; Dodecane: -12°C; n-dodecane: -25.8°C), does not meet the requirements of aviation kerosene (below -40°C), and needs further hydroisomerization treatment before it can be used as aviation kerosene
3) The aldol condensation product of furfural (or hydroxymethylfuran) and acetone is a solid, so solvents must be used in the aldol condensation and hydrodeoxygenation processes, resulting in reduced equipment efficiency and increased operating costs
Because this method uses the selective hydrogenation product methyl furan of furfural as raw material cost is relatively high

Method used

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  • Preparation method for aviation kerosene
  • Preparation method for aviation kerosene
  • Preparation method for aviation kerosene

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Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0026] 1. Catalyst preparation:

[0027] 1) Preparation of solid base catalyst:

[0028] Alkaline earth oxides (MgO, CaO) and rare earth oxides (La 2 o 3 , CeO 2 ) were obtained by calcination of the corresponding nitrates under nitrogen atmosphere for 8 hours, respectively.

[0029] Alkaline earth and rare earth mixed oxides were added dropwise with 20wt% ammonia water to the two nitrate solutions mixed in a certain molar ratio by co-precipitation method, the pH was adjusted to 9, the stirring was continued for 1 hour, dried at 80°C overnight, and calcined at 650°C for 8 hours .

[0030] Magnesium aluminum hydrotalcite is a mixture of Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O solution was added dropwise with NaOH and NaCO at 3mL / min 3 in the mixed solution ([CO 3 ] / [Al]+[Mg]=0.53, [OH] / [Al]+[Mg]=2.33), the dropwise addition process was carried out under strict stirring in a 70°C water bath, after the dropwise addition, continue to stir and age for 16 hours, filt...

Embodiment 6-20

[0037] 2. Aldol condensation reaction: Add 9g furfural, 27.8g MIBK (or lignocellulose-based furfural compounds and branched ketones with a molar ratio of 1:3) and 0.9g catalyst (catalyst ratio: 10wt%) into a 100mL reactor , stirred in an oil bath at 130°C for 8 hours. The detailed reaction results are shown in Table 2.

[0038] Table 2 Aldol condensation reaction and its results

[0039]

[0040] Table 3 Aldol condensation target product structural formula

[0041]

[0042]

[0043] As can be seen from Table 2, in different solid base catalysts: MgO, CaO, La 2 o 3 , CeO 2 、CaO-La 2 o 3 、CaO-CeO 2 , cobalt aluminum hydrotalcite, magnesium aluminum hydrotalcite, KF / Al 2 o 3 , MgO-ZrO 2 Under the action of catalysis, there is a certain yield of aldol condensation products. Among them, CaO, La 2 o 3 , CeO 2 、CaO-La 2 o 3 、CaO-CeO 2 , Hydrotalcite activity is the best. Due to the cheap and easy-to-obtain characteristics of CaO, we chose this catalyst for ...

Embodiment 21-25

[0045] 1) Effect of different reaction substrate ratios on the yield of furfural-MIBK reaction

[0046] Table 4. Effect of different reaction substrate ratios on A yield

[0047]

[0048] It can be seen from Table 4 that the yield of product A is the highest when the molar ratio of furfural to MIBK is 1:3.

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Abstract

The invention relates to a new synthesis route of a liquid branched paraffin fuel, the method adopts a lignocellulose based platform compound as a raw material and is completely independent of fossil energy. The liquid fuel obtained by the method can be used as an aviation kerosene (or diesel) substitute or as an additive to increase the cetane number and cold resistance of fuel. The method provided by the invention includes two steps of: 1) under the promotion of a base catalyst, subjecting a lignocellulose based furfural compound (including furfural, methylfurfural or 5 hydroxymethylfurfural) and branched chain keto (including methyl isobutyl ketone, and mesityl oxide, etc.) to aldol condensation reaction so as to synthesize an oxygen-containing organic compound with a carbon chain length of 9-16; and 2) conducting hydrodeoxygenation on the aldol condensation product generated in step1 to obtain biomass aviation kerosene branched hydrocarbon with a carbon chain length of 9-16, higher energy density, stability and low freezing point.

Description

technical field [0001] The present invention relates to a synthetic route of aviation kerosene based on lignocellulose-derived platform compounds that does not rely on fossil energy at all, and specifically includes two steps: 1) from lignocellulose-based furfural compounds (including furfural, methylfurfural or 5- Hydroxymethylfurfural) and branched ketones (including methyl isobutyl ketone, mesityl oxide, etc.) to generate oxygen-containing organic compounds with a carbon chain length of 9 to 16 through aldol condensation; 2) through the supported metal The catalyst directly hydrodeoxygenates the oxygenated compounds produced by aldol condensation to obtain branched alkanes with a carbon chain length of 9-16. Compared with the previously reported work, the aviation kerosene synthesized in this work is a branched chain hydrocarbon and has a lower freezing point, which can be widely used as biomass aviation kerosene or diesel oil. Background technique [0002] At present, t...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 张涛杨金帆李宁王爱琴丛昱王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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