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Preparation method for aviation kerosene

A technology based on aviation kerosene and furfural, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, biological raw materials, etc., and can solve the problems of unsuitable aviation kerosene and high freezing point

Active Publication Date: 2016-01-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the alkanes synthesized in this process are all straight-chain alkanes, the freezing point of these hydrocarbons is very high (n-pentadecane: 8.5-10°C, n-tridecane: -5.5°C, n-dodecane: -12°C), Does not meet the requirements of aviation kerosene (melting point below -40°C)

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0027] 1. Preparation of catalyst:

[0028] 1) Preparation of solid base catalyst: alkaline earth oxides (MgO, CaO) are commercial catalyst products purchased directly. CeO 2 by the corresponding nitrate in N 2 Calcined under atmosphere for 8h. Alkaline earth and rare earth mixed oxides (CaO-CeO 2 , MgO-La 2 o 3 ) by co-precipitation method 20wt%NH 3 .H 2 O was added dropwise to the two nitrate solutions mixed in a certain molar ratio, the pH was adjusted to 9, stirring was continued for 1 h, dried overnight at 80 °C, and calcined at 650 °C for 8 h. Magnesium aluminum hydrotalcite is the molar ratio of 3:1 Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O mixed solution was added dropwise with NaOH and NaCO at 3mL / min 3in the mixed solution ([CO 3 ] / [Al]+[Mg]=0.53, [OH] / [Al]+[Mg]=2.33), the dropping process was carried out under strong stirring in a 70°C water bath. After the dropwise addition, continue to stir and age for 16 hours, then filter and wash, dry at 80°C o...

Embodiment 11-21

[0034] 2. Aldol condensation reaction: Add 18g furfural, 33g 3-pentanone (or lignocellulose-based furfural compounds and carbonyl-containing compounds with a molar ratio of 1:2), 3g catalyst (catalyst ratio 6wt%) in a 100mL reactor , Stirring at 170°C for 8h. The detailed reaction results are shown in Table 2.

[0035] Table 2 Aldol condensation reaction and its results

[0036]

[0037]

[0038] Table 3 Aldol condensation target product structural formula

[0039]

[0040] As can be seen from Table 2, in different solid base catalysts: MgO, CaO, CeO 2 , MgO-La 2 o 3 、CaO-CeO 2 , 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, KF / Al 2 o 3 The activity is the best. Because CaO is easy to prepare, cheap and easy to obtain, we choose this catalyst for in-depth research.

Embodiment 22-26

[0042] 1) The effect of different reaction substrate ratios on the yield of aldol condensation reaction products of furfural and 3-pentanone

[0043] Table 4. Effect of different reaction substrate ratios on A yield

[0044]

[0045] It can be seen from Table 4 that the yield of product A is the highest when the molar ratio of furfural to 3-pentanone is 1:2.

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Abstract

A preparation method for aviation kerosene is disclosed, and relates to a new route for synthesizing a liquid-state branched paraffin fuel under effect of a cheap catalyst by taking lignocelluloses-based platform compound completely no depending on fossil energy as a raw material. The liquid-state fuel obtained through the route can be used as an aviation kerosene (or diesel oil) substitute or an additive for improving fuel cetane value and cold resistance. The method is divided into two parts, and concretely comprises 1) a lignocelluloses-base furfural compound (comprising furfural, methylfurfural or 5-hydroxymethylfurfural) and a carboxyl-containing compound (comprising 3-pentanone, 5-nonanone and the like) are subjected to an aldol condensation reaction under the effect of a base catalyst for synthesizing an oxygen-containing organic compound with the carbon chain length of 8-16; and 2) the aldol condensation product is subjected to direct oxidative dehydrogenation under the effect of a non-noble metal catalyst for obtaining biomass aviation kerosene branched-chain hydrocarbons which possesses the carbon chain length of 8-16 and possesses relatively high energy density, stability and relatively low freezing point.

Description

technical field [0001] The present invention relates to a new route for synthesizing aviation kerosene with lignocellulose-based platform compounds of non-fossil energy as raw materials, which specifically includes two steps: 1) lignocellulose-based furfural compounds (including furfural, methylfurfural or 5 -Hydroxymethylfurfural) and carbonyl compounds (including 3-pentanone, 5-nonanone, etc.) through aldol condensation reaction to generate oxygen-containing organic compounds with carbon chain lengths between 8 and 16; 2) by loading non- Noble metal catalysts directly hydrodeoxygenate aldol condensation products to obtain branched alkanes with carbon chain lengths ranging from 8 to 16. Compared with the previously reported work, the aviation kerosene synthesized in this work is a branched chain hydrocarbon with a lower freezing point, which can be widely used as biomass aviation kerosene or diesel oil. Background technique [0002] Aviation kerosene, as a liquid fuel in g...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 李宁陈芳张涛王爱琴王晓东丛昱
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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