Novel process for comprehensively utilizing agricultural wastes

Abstract

The invention belongs to the technical field of reutilization of agricultural wastes and particularly relates to a novel process for comprehensively utilizing the agricultural wastes. The novel process comprises the following steps: adding acid into the agricultural wastes and hydrolyzing to obtain aldehyde gas and furfural residues; carrying out filter pressing on the furfural residues and primarily reducing the water content of the furfural residues to be 40%-45%; then drying the furfural residues and further dehydrating the furfural residues; when the water content of the furfural residues is reduced to be 15%-20%, adding fly ash to neutralize; after neutralizing, granulating to obtain biomass fuel; combusting the biomass fuel to be used for biomass power generation; meanwhile, taking solid wastes generated by combustion as raw materials of an organic fertilizer to be reutilized; after filtering and condensing the aldehyde gas, condensing to obtain liquid, namely raw aldehyde; carrying out deacidifying and dehydrating on the raw aldehyde to obtain crude aldehyde; refining the crude aldehyde to obtain finished aldehyde; and carrying out heat exchange on the uncondensed aldehyde gas to replace aldehyde gas heat energy to be used as a heat source for drying the furfural residues, wherein all the percentages are mass percentages.

Description

Technical field [0001] The invention belongs to the technical field of the reuse of agricultural residues, and specifically relates to a new process for comprehensive utilization of agricultural residues. Background technique [0002] At present, a large number of agricultural products in the world are idle and cannot be fully utilized. As the reserves of non-renewable resources are gradually decreasing, people have begun to study how to use renewable resources to replace non-renewable resources. Furfural is an important organic chemical raw material. It is widely used in synthetic resins, electrical insulating materials, fibers, rubber, dyes, medicines, pesticides, solvents, varnishes, nitrofural and refined crude anthracene, as preservatives and cigarette flavors, etc. It is used to synthesize furfuryl alcohol, tetrahydrofurfural, furan resin, phenol furfural resin, 2-methylfuran, etc. It is also the raw material and reagent for pharmaceutical and various organic synthesis. T...

AI Technical Summary

Problems solved by technology

Furfural slag contains certain acidic substances, mainly acetic acid and sulfuric acid. At present, many acid-base neutralization methods are used in China. NaOH aqueous solution is used to neutralize furfural slag. In the whole process, it is necessary to feed the alkaline solution and furfural slag. Strict control, the operation process is relatively complicated, and a certain amount of water will be brought in, which adds additional cost input to the dehydration treatment of the subsequent process

When furfural slag is treated, the method of direct dehydration is generally adopted, which requires more heat energy, low efficiency, and poor dehydration effect

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