Preparation method of 4-vinylphenol

A technology of vinyl phenol and biomass materials, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., to achieve the effects of short reaction cycle, low price and reduced production cost

Inactive Publication Date: 2011-11-23
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of 4-vinylphenol by pyrolysis of biomass

Method used

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  • Preparation method of 4-vinylphenol
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  • Preparation method of 4-vinylphenol

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preparation example Construction

[0022] The invention provides a kind of preparation method of 4-vinylphenol, comprises the following steps:

[0023] Under anaerobic or hypoxic conditions, the biomass material is subjected to a pyrolysis reaction at 200°C to 500°C, and the pyrolysis gas is collected, and the biomass material is a biomass material containing lignin and cellulose;

[0024] After the pyrolysis gas is condensed, 4-vinylphenol is obtained.

[0025] The invention prepares 4-vinylphenol by using low-cost, wide-sourced and renewable biomass materials as raw materials, has simple process, short reaction cycle, and low requirements on reaction equipment and reaction conditions.

[0026] In the present invention, the biomass material is a biomass material containing lignin and cellulose, including various agricultural and forestry residues, such as crop straws, wood waste, etc., preferably gramineous biomass materials, more preferably sugar Bamboo, corncobs, sorghum stalks, bagasse, rice straw, wheat s...

Embodiment 1

[0040] Using bagasse as raw material, crush 1 kg of bagasse to a particle size of less than 1 mm, and then pyrolyze the crushed bagasse at 300°C for 15 minutes under the condition of nitrogen gas, collect the pyrolyzed gas, and condense it with liquid nitrogen Finally, a liquid containing 4-vinylphenol is obtained;

[0041] Described liquid is carried out gas chromatographic analysis, the result sees figure 1 , figure 1 The gas chromatogram of the liquid that is the embodiment of the present invention 1 obtains, figure 1 Among them, the peak that appears between 15min~16min is the characteristic peak of 4-vinylphenol, shows that described liquid contains 4-vinylphenol, and its weight content is 5.2%.

[0042] The liquid was washed 5 times with distilled water, and the organic phase was collected; the organic phase was treated with a rotary evaporator and subjected to vacuum distillation, and fractions at 50°C to 120°C were collected; the fractions were sequentially separated...

Embodiment 2

[0044] Using bagasse as raw material, crush 1 kg of bagasse to a particle size of less than 1 mm, and pyrolyze the crushed bagasse at 500°C for 15 minutes under the condition of nitrogen gas, collect the pyrolyzed gas, and condense it with liquid nitrogen Finally, a liquid containing 4-vinylphenol is obtained;

[0045] The liquid was analyzed by gas chromatography, and the result showed that the weight content of 4-vinylphenol was 13.2%.

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Abstract

The invention provides a preparation method of 4-vinylphenol. The preparation method comprises the following steps: carrying out pyrolytic reaction on a biomass material at the temperature of 200 DEG C-500 DEG C under the oxygen-free or oxygen-poor condition, collecting pyrolytic gas, wherein the biomass material is a biomass material containing ligin and cellulose; and condensing the pyrolytic gas so as to obtain the 4-vinylphenol. According to the method, the pyrolytic temperature of the biomass is controlled to 200 DEG C-500 DEG C, and at the temperature, 4-vinylphenol is generated by the pyrolysis of the biomass. The method provided by the invention is simple in process and short in reaction period, has no high requirements on reaction equipment and reaction conditions; and in addition, low-price wide-source reproducible biomass materials are used as raw materials, thereby obviously reducing the production cost of the 4-vinylphenol.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, and in particular relates to a preparation method of 4-vinylphenol. Background technique [0002] 4-Vinylphenol, alias 4-hydroxystyrene, also known as p-hydroxystyrene, p-vinylphenol, English name is 4-Vinylphenol, molecular formula is C8H8O, relative molecular mass is 120.15, and has formula (I) structure: [0003] [0004] 4-Vinylphenol is soluble in water, partially soluble in alcohol, slightly soluble in oil, and has aromas such as phenol, medicinal and spicy. It is an important organic chemical raw material and pharmaceutical intermediate, widely used in synthetic resins, Synthetic rubber, petroleum processing, food spices, medicine and other industries. At present, the industry mainly adopts the method of catalytic dehydrogenation of p-hydroxyethylbenzene to prepare 4-vinylphenol, and it can also be prepared by Witting reaction. For example, the Chinese patent application n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/20C07C37/00
Inventor 张颖曲艳超汪志陆强
Owner UNIV OF SCI & TECH OF CHINA
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