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Chemical synthesis process of carvacrol

A chemical synthesis and carvacrol technology, applied in organic chemistry, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of multiple types of by-products, increase distillation and impurity removal, etc., and achieve improved conversion rate and good dispersion , the effect of increasing the specific surface area

Active Publication Date: 2022-01-07
ANHUI HAIHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent CN113304743A, o-cresol and isopropanol are used as raw materials or o-cresol, isopropanol and propylene are used as raw materials to prepare carvacrol, and a special catalyst is required to catalyze o-cresol and isopropanol, while o-cresol When using three raw materials, isopropanol and propylene, because there are many raw materials, there are many types of by-products, which will increase the difficulty of subsequent distillation and impurity removal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: a kind of chemical synthesis process of carvacrol, concrete steps are as follows:

[0026] (1) Preparation of modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst: Add 0.4mol aluminum nitrate, 0.1mol copper nitrate and 0.8mol anhydrous citric acid into distilled water, then add 0.2mol cetyltrimethylammonium bromide, pour into the reaction kettle and stir to fully dissolve , heated at 120 ° C, heated and evaporated until the solution viscosity reached 113 mPas, and the solution was roasted at 650 ° C and air atmosphere for 2 hours to obtain Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst; the Al 2 o 3 / CuAl 2 o 4 The composite porous catalyst was immersed in 0.4mol / L ammonium sulfate solution at 65°C for 1.5 hours, dried in an oven at 100°C for 2 hours, and finally baked in a muffle furnace at 420°C to obtain modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst, where Al 2 o 3 Phase and CuAl 2 o 4 The molar ratio of the phases is 1:1....

Embodiment 2

[0029] Embodiment 2: a kind of chemical synthesis process of carvacrol, concrete steps are as follows:

[0030] (1) Preparation of modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst: Add 0.43mol aluminum nitrate, 0.1mol copper nitrate and 0.83mol anhydrous citric acid into distilled water, then add 0.25mol cetyltrimethylammonium bromide, pour into the reaction kettle and stir to fully dissolve , heated at 130 ° C, heated and evaporated until the solution viscosity reached 118 mPas, and the solution was roasted at 700 ° C and air atmosphere for 1.5 hours to obtain Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst; the Al 2 o 3 / CuAl 2 o 4 The composite porous catalyst was immersed in 0.42mol / L ammonium sulfate solution, soaked at 70°C for 1.2 hours, dried in an oven at 110°C for 1.5 hours, and finally baked in a muffle furnace at 450°C to obtain modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst, where Al 2 o 3 Phase and CuAl 2 o 4 The molar ratio of th...

Embodiment 3

[0033] Embodiment 3: a kind of chemical synthesis process of carvacrol, concrete steps are as follows:

[0034] (1) Preparation of modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst: Add 0.4mol aluminum nitrate, 0.11mol copper nitrate and 0.84mol anhydrous citric acid into distilled water, then add 0.15mol cetyltrimethylammonium bromide, pour into the reaction kettle and stir to fully dissolve , heated at 115 ° C, heated and evaporated until the solution viscosity reached 109 mPas, and the solution was roasted at 600 ° C and air atmosphere for 2.5 hours to obtain Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst; the Al 2 o 3 / CuAl 2 o 4 The composite porous catalyst was immersed in 0.35mol / L ammonium sulfate solution, soaked at 60°C for 2 hours, dried in an oven at 120°C for 1.5 hours, and finally baked in a muffle furnace at 480°C to obtain modified Al 2 o 3 / CuAl 2 o 4 Composite porous catalyst, where Al 2 o 3 Phase and CuAl 2 o 4 The molar ratio of the ...

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Abstract

The invention aims to provide a method for preparing high-purity carvacrol by only adopting o-cresol and propylene as raw materials. According to the invention, a modified Al2O3 / CuAl2O4 composite porous catalyst is firstly prepared, and due to the special porous structure and modification effect of the catalyst and the two-phase composite structure of Al2O3 and CuAl2O4, a good synergistic effect is achieved; and carvacrol can be prepared by using o-cresol and propylene without more raw materials, toxic organic solvents and the like, and the high o-cresol conversion rate and the carvacrol selectivity are ensured so as to ensure the carvacrol yield and the carvacrol purity.

Description

technical field [0001] The invention relates to a chemical synthesis process of carvacrol, in particular to a method for preparing high-purity carvacrol by using o-cresol and propylene. Background technique [0002] Carvacrol naturally exists in essential oils such as thyme oil, especially in thyme oil produced in Spain, which has a high content of carvacrol. Carvacrol is mainly used in the preparation of flavors such as dill, clove, mint and vanilla, used in toothpaste, tooth powder, oral products, talcum powder, soap and daily industrial products. [0003] In the prior art, o-cresol and 2-dichloropropane are used to prepare carvacrol, such as patent CN1488615A, but its raw material solvents 2-dichloropropane and methylene chloride are toxic, not only harmful to the working environment, but also o-cresol exists The conversion rate is low, and the yield of carvacrol is low. In the prior art, CN109851479A adopts o-cresol and isopropanol to prepare carvacrol as a raw materia...

Claims

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Application Information

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IPC IPC(8): C07C39/06C07C37/14C07C37/74B01J23/72
CPCC07C37/14C07C37/74B01J23/72B01J23/002C07C39/06
Inventor 解凤苗张其忠杨品张贵韩辉肖曹齐朱志荣赵国庆张强唐东升
Owner ANHUI HAIHUA CHEM
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