Method for preparing chemical raw material and liquid fuel from biomass

Abstract

The invention discloses a method for preparing a chemical raw material and a liquid fuel from biomass. The method comprises the following steps: 1, subjecting a biomass raw material to a pyrolysis reaction so as to obtain pyrolysis products including pyrolysis gas, biological tar, pyrolyzed water and pyrolyzed semicoke; 2, preparing a first hydrogenation catalyst with the obtained pyrolyzed semicoke as a carrier and putting the prepared first hydrogenation catalyst aside for subsequent usage; 3, preparing slurry from the obtained biological tar, the first hydrogenation catalyst and hydrocarbonoil, allowing the obtained slurry to enter a slurry bed hydrogenation reactor for a hydrogenation reaction so as to obtain hydrogenated bio-oil, subjecting the obtained hydrogenated bio-oil to distillation separation to obtain light bio-oil, water and tail oil, and circulating a part of the obtained tail oil to replace the hydrocarbon oil for preparation of the slurry; and 4, carrying out catalytic cracking on the obtained light bio-oil to obtain the chemical raw material and the liquid fuel. The biomass conversion method provided by the invention is simple in slurry preparation and can be continuously operated, and the obtained products can be directly utilized.

Description

technical field [0001] The invention relates to the field of biomass application. More specifically, the present invention relates to a method for producing chemical raw materials and liquid fuels from biomass. Background technique [0002] As the only material renewable resource, biomass includes animals, plants, microorganisms and their excretion and metabolites. Biomass can be directly burned to generate electricity, and can also be further utilized as a supplement to oil and natural gas to produce chemical raw materials and liquid fuels. my country produces about 700 million tons of crop straw and about 250 million tons of forestry waste every year. If some of them are converted into liquid fuels and chemical raw materials, they can replace about 100 to 200 million tons of petroleum energy, which can greatly reduce my country's dependence on foreign oil. , which is of great significance to my country's energy security strategy. [0003] In the prior art, among biomass ...

AI Technical Summary

Problems solved by technology

At present, the biomass oil production process generally adopts the pyrolysis method. The so-called pyrolysis method refers to the transformation of biomass into pyrolysis gas (commonly known as "wood gas"), pyrolysis of biological tar (commonly known as "wood tar"), pyrolysis of water ( Commonly known as "wood vinegar"), pyrolysis semi-coke (commonly known as "biological charcoal"), etc. Biotar produced by biomass pyrolysis oil production technology is mainly oxygen-rich phenols, ketones, aldehydes and alcohols , with hundreds of components, difficult to separate, difficult to be directly and efficiently separated into chemical products, and can only be sold as fuel oil with low calorific value

Moreover, the stability of biopyrolysis tar is poor, and it is easy to oxidize, deteriorate and polycondensate when stored under natural conditions.

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