A kind of preparation method of aviation kerosene or diesel oil

Abstract

The invention relates to a new path for synthesizing liquid chain hydrocarbon fuel on the basis of adopting lignocelluloses and hemicelluloses platform compounds as materials. The method comprises the following three parts: (1) catalyzing angelica lactone and biomass aldehyde / ketone compound by using amphoteric metal oxide ion liquid as a catalyst and preparing A-R series of lactone type aviation kerosene precursors; (2) carrying out low-temperature hydrogenation on the lactone type aviation kerosene precursors to effectively remove carbon-carbon double bonds in the lactone type aviation kerosene precursors so as to prepare a liquid saturated oxygen-containing compound containing a lactone structure; and (3) carrying out hydrogenation and deoxidation on pre-hydrogenated products by adopting metal / solid acid catalyst so as to obtain biomass aviation kerosene or high-quality diesel oil with the carbon-chain length being 6-11.

Description

technical field [0001] The invention relates to a new route for obtaining platform compounds to synthesize liquid chain hydrocarbon fuels based on lignocellulose as a raw material. The inventive method is divided into three parts altogether: 1) the dehydration product of levulinic acid-angelica lactone is mixed with furfural under the effect of ionic liquid in metal oxide catalyst (as magnesium oxide, zinc oxide, lanthanum oxide, manganese oxide etc.) 18 types of aviation fuel precursors such as A-R are produced through aldol condensation reaction of aldehyde compounds or ketone compounds such as acetone; 2) through low-temperature hydrogenation of 18 types of aviation fuel precursors such as A-R, the carbon-carbon double bond, to prepare liquid saturated oxygen-containing organic compounds; 3) by using a metal-molecular sieve catalyst to carry out hydrodeoxygenation on the hydrogenated liquid oxygen-containing organic compounds, to obtain biomass aviation with a carbon chain ...

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Problems solved by technology

However, it uses edible oil and grain as raw materials. The raw materials are limited, the cost is high, and people compete for land and grain. It is not suitable for the national conditions of our country with a large population and little land, nor is it suitable for the sustainable development of human society.

The third stage of biomass liquid fuel is to use non-edible lignocellulose as raw material. At present, there are three main ways to prepare fuel: 1) Thermochemical gasification of biomass to synthesis gas, and then production of alkanes by Fischer-Tropsch synthesis. The process is relatively mature, but it requires high temperature and high pressure conditions, and has high requirements for production equipment; 2) High temperature pyrolysis of biomass to produce biomass oil is a complicated process, and the quality of the obtained biomass oil is poor, so it cannot be used directly As engine fuel, further refining is required; 3) Biomass platform compound molecules obtained from lignocellulose are subjected to carbon-carbon coupling reactions such as aldol condensation and alkylation, and then hydrodeoxygenated to produce liquid alkanes , the process conditions are relatively mild, and the synthetic route is flexible

However using Pt / SiO 2 -Al 2 o 3 As a hydrodeoxygenation catalyst, a fixed-bed four-phase flow reactor is used. Hexadecane needs to be added to prevent catalyst deactivation during the reaction process. The process is relatively complicated and the cost is high.

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