Thermally dissolving and catalytic method for preparing liquid fuel by lignite as well as catalyst and solvent used therefor

Abstract

The invention belongs to the technological field of coal chemical processing and discloses a heat dissolving and catalyzing method using brown coal to prepare liquid fuel. The method comprises the following steps: 1) the brown coal is smashed and dried to prepare pulverized coal; 2) the pulverized coal, solvent and catalyst are stirred and mixed well to prepare coal slurry; wherein, the weight percent of the pulverized coal is 30 percent to 40 percent; the weight percent of the solvent is 60 percent to 70 percent; the quantity of the added catalyst is 0.5 percent to 1 percent of the weight of the pulverized coal; 3) the coal slurry is dissolved by heat and catalyzed to prepare heat dissolved and liquefied products; wherein, the temperature is 390 DEG C to 450 DEG C; the pressure is 5.0MPa to 9.0MPa; the reaction time is 30 minutes to 60 minutes; 4) the heat dissolved and liquefied products are separated to form gas-phase, liquid-phase and solid-phase products; 5) the liquid products are extracted and processed to form liquid fuel. The invention also discloses catalyst and solvent used in the method. The operation condition of the method of the invention is mild; the conversion ratio of the organic substances in the brown coal can achieve a higher level; after being processed, the liquid fuel product can be used for preparing engine fuel suiting national standards; and the preparation equipment is simple; the investment is small; the cost is low; and the invention is a coal liquefaction method suiting the national conditions of China.

Description

technical field [0001] The invention belongs to the technical field of coal chemical processing, and in particular relates to a hot-melt catalytic method for preparing liquid fuel from lignite and the catalyst and solvent used therein. Background technique [0002] At present, there are three main methods of producing liquid fuel from coal, which are summarized by domestic and foreign data: (1) pyrolysis of coal (low temperature, high temperature dry distillation): the basic process of this process is to put coal under the action of heat Decomposition and polymerization are generally carried out at normal pressure and above 400°C to obtain hydrogen-rich gas, low molecular liquid tar and coke. This process is relatively mature, but its disadvantages are: the conversion rate of organic matter is low, and the pollution in the processing process is large; (2) Indirect coal liquefaction method: the basic process of this process is to first gasify coal into synthesis gas (CO and H...

AI Technical Summary

Problems solved by technology

This process is relatively mature, but its disadvantages are: the conversion rate of organic matter is low, and the pollution in the processing process is large; (2) Indirect coal liquefaction method: the basic process of this process is to first gasify coal into synthesis gas (CO and H 2 ), under the catalysis of iron agent, cobalt agent and ruthenium agent, liquid fuel is prepared by Fischer-Tropsch reaction (Fischer-Tropsch Reaction)

However, the disadvantages of this process are: complex process, large investment, high cost, and high technical requirements; (3) high-pressure hydrogenation liquefaction method of coal: the process is characterized by high pressure (10-30MPa), high temperature (450-500°C ) and catalysts, the polymer chemical structure of coal is destroyed and hydrogenated

However, the disadvantages of this process are: harsh conditions, high requirements for equipment, large investment and high cost

The process is simple, but the oil yield is very low, and its products cannot be used directly, and must be compounded with kerosene or methanol, so it is called substitute diesel oil

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