Process for directly producing natural benzaldehyde using cassia twig leaf and cassia bark as raw material

A technology of cinnamon twig leaves and benzaldehyde, applied in the field of producing natural benzaldehyde, can solve the problems of increasing production process, energy consumption and cost, and achieve the effects of less investment, low production cost and energy saving

Inactive Publication Date: 2006-03-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

If commercial cinnamon oil is used as raw material to prepare natural benzaldehyde, the production process, energy consumption and cost of the product will be significantly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Weigh 8 kg of cassia twig leaves with a length of 3-6 cm and put them into the still charging frame, add 1 L of sodium hydroxide of catalyst 1% (percentage by weight, the same below) in a 6 L hydrolysis reactor, feed 0.1 Mpa steam, and react for 4 h Heating was stopped to obtain 40.0 g of crude benzaldehyde with a benzaldehyde content of 82.1% (gas chromatography, the same below).

Embodiment 2

[0012] Take by weighing 8 kg of cassia twig leaves of 3-6cm length and put them into the still charging frame, add catalyzer 1% potassium hydroxide 1L in 6L hydrolysis reactor, pass into 0.1Mpa steam, react 4h and stop heating, obtain crude benzaldehyde 40.1 g, its benzaldehyde content is 80.2%.

Embodiment 3

[0014] Weigh 8 kg of cassia twig leaves with a length of 3-6 cm and put them into the charging frame of the distillation kettle, add 1 L of catalyst 4% calcium hydroxide in a 6 L hydrolysis reactor, feed 0.1 Mpa steam, react for 4 hours and stop heating to obtain 20 g of crude benzaldehyde , and its benzaldehyde content is 65.1%.

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Abstract

The process of producing natural benzaldehyde directly with cassia twig, leaf and bark as raw material includes the steps of: crushing cassia twig, leaf and bark, and distilling in distiller; hydrolysis of the mixed gas of steam and cassia oil from the distiller, inside hydrolysis reactor with inlet connected to the outlet of the distiller and through contact with alkaline catalyst to produce benzaldehyde in the steam mixture; and condensing the mixture to obtain coarse benzaldehyde product. The present invention can produce natural benzaldehyde by increasing one hydrolysis reactor to available cassia oil producing apparatus, and has short technological path, low power consumption, low cost and coarse benzaldehyde yield of 0.5 %.

Description

technical field [0001] The invention belongs to a method for directly producing natural benzaldehyde by taking cassia twig leaves and cassia bark as raw materials. Background technique [0002] Food-grade natural benzaldehyde can be obtained through deep processing of natural cinnamon oil. At present, the main production process using this method in China is ozonation [see "Ozonation of Natural Cinnamon Oil to Produce Natural Benzaldehyde" "Fine Chemical Industry" 1996.6.P32-34] 1. Hydrolysis (reverse aldol condensation reaction) method under alkaline conditions [see "Research on the preparation of natural benzaldehyde by hydrolysis of laurel leaf oil" "Guangxi Chemical Industry" 1997.3.P1~3; "Preparation from laurel leaf oil under phase transfer catalytic conditions Research on natural benzaldehyde" "Chemical World" 2002.6.P315~317]. Chinese invention patents that have been applied for include "A New Method for Preparing Natural Benzaldehyde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/54C07C45/42
Inventor 李伟光粟桂娇刘雄民郭占京周永红
Owner GUANGXI UNIV
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