Method for preparing aviation oil through catalyzing algae oil by virtue of phosphotungstic acid-loaded nickel base molecular sieve

Abstract

The invention relates to the utilization technique of biomass energy and aims at providing a method for preparing aviation oil through catalyzing algae oil by virtue of a phosphotungstic acid-loaded nickel base molecular sieve. The method comprises the following steps: adding a phosphotungstic acid-nickel base gradient mesoporous molecular sieve catalyst into a fixed bed continuous flow reactor, controlling the temperature and hydrogen pressure of the reactor, and carrying out deoxygenation bond breaking reaction on a microalgae biodiesel reactor, wherein four distil-off holes are sequentiallyformed in the side wall of the reactor from top to bottom and are used for discharging mixtures in the reactor in different reaction stages; and sequentially extracting four distillates, and mixing,so as to obtain a microalgae biological aviation oil product. According to the method, long-chain n-alkane is obtained through effectively controlling decarboxylic reaction of microalgae biodiesel, and is further subjected to bond breakage to generate short-chain n-alkane, and short-chain n-alkane is subjected to isomerization and aromatization so as to generate the microalgae biological aviationoil product with selectivity reaching up to 63.1%, the content of isoparaffin in the aviation oil product is remarkably increased to 32.5%, and a reasonable aromatic hydrocarbon content, namely 17.6%,is realized.

Description

technical field

[0001] The invention relates to biomass energy utilization technology, in particular to a method for preparing aviation oil from algae oil catalyzed by nickel-based molecular sieve loaded with phosphotungstic acid. Background technique

[0002] The International Air Transport Association (IATA) has pledged to reduce aviation net carbon dioxide emissions to half of 2005 levels by 2050. The carbon emissions generated by biomass energy utilization are almost equal to the carbon accumulated by biomass through photosynthesis, so bio-aviation fuels that are close to carbon neutral have broad application prospects. As a representative of the third generation of bio-energy, microalgae has many advantages such as fast growth, high oil content, no occupation of arable land, and no competition with food, etc. It is an ideal raw material for the preparation of bio-aviation fuel. The use of microalgae biodiesel (mainly composed of fatty acid methyl esters) for hydrogenat...

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