Method for producing biomass oil from straws

Abstract

The invention discloses a method for producing biomass oil from straws. The method is characterized by comprising the following steps: (1) washing and drying a straw material; (2) crushing the straw material; (3) preparing a straw depolymerization solvent, wherein the volume ratio of organic acid to hydrogen peroxide is 24: 1-22: 3; (4) depolymerizing the straw powder in a solvent under the conditions that the pressure is normal, the temperature is 30-70 DEG C, the solid-to-liquid ratio of the straw powder to the depolymerizing solvent is 1: 12-1: 60, the mechanically stirring rotating speed of 90-150rpm, and the depolymerizing time is 12-48h; (5) filtering a depolymerizing product at normal temperature and normal pressure, and carrying out solid-liquid separation; and (6) rectifying the separated liquid to remove the organic acid solvent, and adding ethanol to prepare the biomass oil.

Description

technical field [0001] The invention relates to a method for preparing biomass oil, in particular to a method for preparing straw biomass oil by circulating a green solvent under normal pressure and near room temperature, and belongs to the technical field of biomass energy. Background technique [0002] With the continuous expansion of human demand for energy, the fossil resources that mainly provide energy for human beings are rapidly decreasing, and the excessive development and utilization of fossil energy has brought about environmental pollution and global climate anomalies. Therefore, it is imminent to find and develop new renewable energy sources. [0003] From 2017 to 2019, my country's annual straw output was about 900 million tons, of which the top three were corn straw (about 350 million tons), rice straw (about 240 million tons) and wheat straw (about 140 million tons). In 2019, the comprehensive utilization rate of straw across the country reached over 80%, bu...

AI Technical Summary

Problems solved by technology

In 2019, the comprehensive utilization rate of straw in the country reached over 80%, but there are still about 200 million tons of straw that are directly incinerated and discarded, resulting in waste of resources and environmental pollution

The main problem at present is that thermal cracking requires high temperature, no oxygen or less oxygen conditions, harsh reaction conditions, high requirements for equipment, high production cost, and the generated biomass oil is gas at high temperature, and entrains a certain amount of ultrafine carbon When the gas is cooled, the ultra-fine carbon powder will cause dirt or blockage in the equipment and pipelines, and cause the cooled oil to contain solid suspended matter, making it easy to block the pipelines and combustion nozzles during subsequent combustion

In addition, the components of straw converted into biomass oil are cellulose and hemicellulose, and lignin is converted into low value-added charcoal, and the added value of straw utilization is not high

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