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 material requirements, and reducing side reactions

Active Publication Date: 2009-11-04
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

The invention discloses a method for preparing high-purity myrcene by pyrolyzing β-pinene. The method is as follows: mixing β-pinene with non-reactive medium gas, preheating β-pinene to below 600°C, and non-reactive The temperature of the inert medium gas is 500°C to 700°C, the temperature after gas mixing is between 520°C and 580°C, then the gas mixture passes through a tubular cracking reactor, and the residence time of the gas in the cracking tube in the cracking reactor is 0.01 to 1 second, the wall temperature is controlled at 500°C to 600°C, the pressure of the gas in the cracking reactor is controlled at 100Pa to 5000Pa, after the gas leaves the cracking reactor, it is condensed and the cracked product myrcene is recovered. The content of myrcene prepared by the present invention generally reaches more than 80%; moreover, the degree of coking in the cracking tube can be reduced.

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 of the catalyst After th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/21C07C4/10
Inventor 周家华赵子牛
Owner SOUTH CHINA AGRI UNIV
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