Method for preparing 4-vinylphenol through catalytic pyrolysis of gramineous biomass

Abstract

The invention belongs to the field of utilization of biomass energy, and concretely relates to a method for preparing 4-vinylphenol through catalytic pyrolysis of gramineous biomass. The method comprises the following steps: loading an alkaline catalyst onto gramineous biomass used as a raw material in an impregnation manner, carrying out catalytic pyrolysis at 230-350 DEG C in an inert atmosphere, and condensing the obtained pyrolysis gas to obtain a liquid product rich in the 4-vinylphenol. The yield of the 4-vinylphenol and the selectivity of the 4-vinylphenol in the organic liquid product are high. The method for preparing the 4-vinylphenol overcomes the defects of low content of the 4-vinylphenol in obtained bio-oil, poor selectivity and high separation and extraction cost of existing gramineous biomass pyrolysis liquefaction technologies, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing 4-vinylphenol by catalytic pyrolysis of gramineous biomass. Background technique [0002] 4-Vinylphenol is a colorless crystal with a phenol-like chemical and drug smell, and has a musty and meaty aroma. When diluted, it has a sweet and vanilla bean extract aroma. It is widely used in synthetic resins, inks , synthetic rubber, flavor formula, petroleum processing and pharmaceutical industries. [0003] Chinese patent application number 200610042200.9 discloses a preparation method of 4-vinylphenol, which uses p-hydroxybenzaldehyde and malonic acid as raw materials, reacts in an alkaline catalyst and an aprotic polar organic solvent to obtain 4-vinylphenol base phenol; this method not only requires high reaction conditions and reaction equipment, but also has a long reaction cycle and high production costs. [0004] Another document...

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Problems solved by technology

[0003] Chinese patent application number 200610042200.9 discloses a preparation method of 4-vinylphenol, which uses p-hydroxybenzaldehyde and malonic acid as raw materials, reacts in an alkaline catalyst and an aprotic polar organic solvent to obtain 4-vinylphenol phenol; this method not only requires high reaction conditions and reaction equipment, but also has a long reaction cycle and high production costs

[0004] Another document, China Patent Application No. 201110134872.3, reports a method for preparing 4-vinylphenol from biomass. Although this technology uses biomass pyrolysis to prepare 4-vinylphenol, the pyrolysis reaction time is longer and the temperature rises The rate is low, all have certain inhibition to the generation of 4-vinylphenol, make the productive rate of 4-vinylphenol in the organic liquid product that this method obtains is lower; The formation of other pyrolysis products other than 4-vinylphenol is effectively suppressed, so that the purity of 4-vinylphenol in the liquid product is also low, resulting in the difficulty and cost of 4-vinylphenol separation and purification.