A new catalytic technique for the preparation of long-chain alkanes from biomass derivatives furfural or hmf

A technology for long-chain alkanes and derivatives, applied in the fields of catalytic chemistry and chemical technology, can solve the problems of high cost, reduced selectivity of target products, and high investment in reaction units

Inactive Publication Date: 2011-12-28
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

The disadvantages of this approach are: the reaction conditions are relatively harsh, the investment of the reaction device is high, higher requirements are put forward for its later maintenance, the cost is high, and it does not meet the current general trend of energy saving and emission reduction; Lower partial catalytic cracking (in acid-catalyzed reactions), which reduces the selectivity of the target product

Method used

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  • A new catalytic technique for the preparation of long-chain alkanes from biomass derivatives furfural or hmf

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Effect test

Embodiment 1

[0016] Mix 9.6g of furfural, 58g of acetone, and 72.4ml of 1.4% NaOH aqueous solution, stir at room temperature for 2 hours, let stand for liquid separation, take the bottom product, wash with a large amount of deionized water, and dry to obtain 11.3g of condensation product. The resulting condensation product was dissolved in 50ml tetrahydrofuran, using Pd / MnO 2 / MgO ring-opening hydrogenation dual-functional catalyst, reacted in a batch reactor, the reaction conditions are: 145 degrees, 2.5MPa, the reaction time is 24 hours, the conversion rate is 99%, 1,7-octanediol selectivity The selectivity for 2,5-octanediol was 35%, and the selectivity for 4-(2-tetrahydrofuryl)-2-butanol was 42%. Finally, the obtained polyol mixture is reacted in a fixed-bed reactor under the action of Pt / HZSM-5 hydrogenation / dehydration dual-function catalyst at 3MPa, 180 degrees, and a space velocity of 2.4h -1 conditions, polyols can be completely converted, octane (C 8 ) selectivity of 45%.

Embodiment 2

[0018] Mix 24g furfural, 100g acetone, and 500ml ethanol evenly, and use 5g MgAl 2 o 4 As a solid base catalyst, it was stirred at 120°C for 20 hours, and the reaction solution was filtered to separate the solid base catalyst. The ethanol solution of the obtained condensation product was directly used as the reaction solution, and Ru / TiO 2 / CeO 2 Ring-opening hydrogenation bifunctional catalyst, reacted in a fixed bed, the reaction conditions are: 160 degrees, 1.5MPa, space velocity 5h -1 , conversion rate is 52%, 1,7-octanediol selectivity is 15%, 2,5-octanediol selectivity is 42%, 4-(2-tetrahydrofuryl)-2-butanol selectivity is 37% %. Finally, the resulting polyol mixture, in Pt / SiO 2 Under the action of hydrogenation / dehydration dual-functional catalyst, the reaction is carried out in a fixed-bed reactor at 2MPa, 200 degrees, and a space velocity of 3.6h -1 Under these conditions, polyols can be completely converted, and the selectivity of octane is 55%.

Embodiment 3

[0020] Mix 24g HMF, 50g acetone, and 500ml ether evenly, and use 10g MgO-ZrO 2 Composite oxide (Mg / Zr=2) was used as a solid base catalyst, stirred at 160°C for 5 hours, and the reaction solution was filtered to separate the solid base catalyst. The diethyl ether solution of the obtained condensation product is directly used as the reaction solution, and the Ni / WO 3 / SiO 2 Ring-opening hydrogenation bifunctional catalyst, reacted in a fixed bed, the reaction conditions are: 60 degrees, 2.5MPa, space velocity 1.2h -1 , conversion rate is 38%, 2,5,9-nonanetriol selectivity is 9%, 1,2,8-nonanetriol selectivity is 18%, 4-(5-hydroxymethyl-2-tetrahydrofuryl )-2-butanol selectivity was 37%. Finally, the obtained polyol mixture, in PtCo / Nb 2 o 5 Under the action of hydrogenation / dehydration dual-functional catalyst, the reaction is carried out in a fixed-bed reactor at 1MPa, 200 degrees, and a space velocity of 10h -1 Under these conditions, polyols can be completely converted, ...

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Abstract

The invention relates to a new catalytic technology for preparing long-chain alkanes from biomass derivative furfural or 5-hydroxymethylfurfural (HMF), which can produce octane and nonane with high selectivity, as well as a small amount of tridecane and deca The pentane solves the problems of harsh conditions and low alkane selectivity in the process of preparing fuel from biomass derivatives. Using biomass derivatives furfural or HMF as raw materials, by designing new catalysts and new reaction pathways, an overall process and catalyst system for the preparation of long-chain alkanes from biomass derivatives furfural or HMF is proposed. The outstanding feature is that the reaction conditions are mild, Alkanes are more selective.

Description

technical field [0001] The invention belongs to the fields of chemical technology and catalytic chemistry, and particularly relates to the technology and catalyst for preparing fuel from biomass derivatives. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of renewable new energy has become a top priority. Biomass resources have significant advantages such as wide distribution, large total content, and recyclability, and have attracted widespread attention at home and abroad. How to effectively use lignocellulose, which has the largest content in biomass resources, has become one of the biggest challenges in this field. one. [0003] The traditional methods for preparing fuel from biomass are pyrolysis (Chinese patent CN 1432625A, etc.), microwave cracking (Chinese patent CN 100999676A, CN 100999677A, CN 100365099C, etc.), and subsequent product refining (Chinese patent CN 1432626A). The biggest feature of these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/15C07C1/20
Inventor 王艳芹徐文杰卢冠忠刘晓晖任家文郭耘郭杨龙王筠松张志刚龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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