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Method for preparing high purification myrcene by thermal cracking beta firpene

A technology of myrcene and pyrolysis, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve low-level problems, achieve the effects of reducing the degree of coking, reducing side reactions, and reducing material requirements

Active Publication Date: 2007-10-03
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if a catalyst is introduced into the reaction, the optimal reaction temperature zone will only move down, which may improve the selectivity of β-pinene cracking to a certain extent, but the side reactions caused by too low temperature and high temperature still exist, but to a lesser extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] β-pinene is preheated to 200°C, and then mixed with 600°C nitrogen through a gas mixer. The weight ratio of β-pinene to nitrogen is 1:4, and the temperature after gas mixing is 520°C. The gas mixture passes through a 25m, 2000mm in length internally polished tubular pyrolysis reactor, introduce nitrogen at 600°C at a distance of 500mm from the inlet, the gas enters the cracking tube tangentially, the weight ratio of β-pinene to nitrogen is 1:8, and the wall temperature is controlled At 500° C., the residence time of the gas in the cracking tube in the cracking reactor is 0.063 seconds, and the pressure of the gas in the cracking tank is controlled at 100 Pa. After the gas leaves the reactor, it is condensed by a heat exchanger, the cracked product myrcene is recovered, and the noncondensables are emptied. In order to make full use of thermal energy, part of the waste heat can be used to heat the β-pinene and / or nitrogen introduced into the cracker. The pyrolysis produc...

Embodiment 2

[0023] β-pinene is preheated to 200°C, and then mixed with 600°C nitrogen in a high-efficiency gas mixer. The weight ratio of β-pinene to nitrogen is 1:12, and the temperature after gas mixing is 520°C. The gas mixture passes through a An internally polished tubular cracking reactor with a diameter of 25mm and a length of 2000mm, the temperature of the wall is controlled at 500°C. The residence time of the gas in the cracking tube in the cracking reactor is 0.057 seconds, and the pressure of the gas in the cracking tank is controlled at 1000Pa. After the gas leaves the reactor, it is condensed with a partition heat exchanger to recover the cracked product myrcene, and the noncondensables are emptied. In order to make full use of heat energy, part of the waste heat can be used to heat the β-pinene and / or nitrogen introduced into the cracker. The pyrolysis product was analyzed by gas chromatography, and the content of myrcene was determined by internal standard method, and the c...

Embodiment 3

[0025] β-pinene is preheated to 200°C, and then mixed with 700°C nitrogen in a high-efficiency gas mixer. The weight ratio of β-pinene to nitrogen is 1:4, and the temperature after gas mixing is 520°C. The gas mixture passes through a Internally polished tubular cracking reactor with a diameter of 25mm and a length of 2000mm. The wall temperature is controlled at 530° C., the residence time of the gas in the cracking tube is 0.058 seconds, and the pressure of the gas in the cracker is controlled at 1000 Pa. After the gas leaves the reactor, it is condensed with a partition heat exchanger to recover the cracked product myrcene, and the noncondensables are emptied. In order to make full use of heat energy, part of the waste heat can be used to heat the β-pinene and / or nitrogen introduced into the cracker. The pyrolysis product was analyzed by gas chromatography, and the content of myrcene was determined by internal standard method, and the content of myrcene was 81.4%.

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Abstract

A process for preparing high-purity laurene from beta-pinene by thermal cracking includes such steps as mixing beta-pinene at a temp lower than 600 deg.C with non-reactive gas medium at 500-700 deg.C to obtain a gas mixture at 520-580 deg.C, cracking reaction at 500-600 deg.C under 100-5000 Pa for 0.01-1 S in a tubular cracking reactor, and condensing to obtain laurene.

Description

technical field [0001] The invention relates to the thermal cracking technology of β-pinene, in particular to a method for preparing high-purity myrcene by thermally cracking β-pinene. Background technique [0002] Myrcene is also known as β-myrcene, myrcene, 7-methyl-3-methylene-1,6-octadiene, and its molecular formula is C 10 h 16 , Myrcene is an important fragrance intermediate. In the production of myrcene, the most important technical indicator is the content of myrcene in the cracking product of β-pinene. Early attempts were made to use catalysts to improve the selectivity and conversion rate, but the cracking reaction speed is fast, and the reaction time is often within 0.1 In seconds, smooth and non-porous catalysts have low catalytic efficiency. Although porous catalysts may have relatively high catalytic efficiency, because the reaction rate of β-pinene is much higher than the mass transfer rate, the β-pinene that stays in the micropores o...

Claims

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Application Information

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IPC IPC(8): C07C11/21C07C4/10
Inventor 周家华赵子牛
Owner SOUTH CHINA AGRI UNIV
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