Method for preparing biological oil from algae biomass through direct catalytic liquefaction method

Abstract

The invention relates to a method for preparing biological oil from algae biomass through a direct catalytic liquefaction method, which is a hydrothermal method with algae biomass as a raw material. The method comprises pretreatment, catalytic liquefaction and separation, wherein the pretreatment comprises the steps of: soaking dried and crushed algae in 0.05-0.15mol / L alkali liquor or acid liquor for not less than 20h, pouring the soaking liquid and a modified natural mordenite catalyst into a pressure kettle, catalytically liquefying for not less than half an hour under the condition of agitation in an oxygen free and hydrogen atmosphere at 200-400 DEG C under 3-16MPa, cooling, reducing the temperature, relieving the pressure, separating the solid and the liquid, and dehydrating the liquid under reduced pressure to obtain biological oil. The algae liquefaction rate of the invention is high and reaches more than 82%; the grade of the oil product is high, and the heat value can reachmore than 30 MJ / kg; a water phase system is adopted, so that the invention has the advantages of environmental protection, low preparation cost, relatively mild reaction conditions and good market application prospects, saves energy and is simple and convenient for operation and easy for realization of large-scale production.

Description

1. Technical field [0001] The invention relates to a method for preparing bio-oil, in particular to a method for preparing bio-oil by using algae biomass as a raw material and utilizing catalytic liquefaction technology in an aqueous phase system. 2. Background technology [0002] As a new alternative energy source to fossil fuels, bio-oil is clean and non-polluting due to its renewable, CO 2 The net emission is zero and other advantages, which are generally valued by people. At present, the main raw materials for preparing bio-oil at home and abroad include lignin and cellulose in agricultural and forestry crops and domestic waste, such as crop straw and wood processing waste. These raw materials are difficult to liquefy directly. The classification and crushing before liquefaction requires a lot of energy consumption. The sources of raw materials are scattered and difficult to collect, resulting in increased costs and low economic benefits. Algae biomass has the advantag...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the obtained bio-oil has high grade, low oxygen content and high calorific value; the disadvantage is that the reaction conditions are harsh, the equipment requirements are high, and industrial production will bring potential dangers.

[0004] In summary, it can be seen that the various existing methods have both certain advantages and various shortcomings, which lead to low production efficiency of bio-oil, high preparation cost, low product quality, and difficulty in industrial production, which creates difficulties for subsequent processing and use. , and therefore are not promoted

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