Catalyst and application of catalyst to method for preparing thymol

A thymol and catalyst technology, applied in the chemical field, can solve the problems of harsh reaction conditions, poor catalyst reactivity, and high equipment requirements, and achieve excellent product yield, easy activation and regeneration, and simple preparation methods

Active Publication Date: 2014-12-10
上海泾维化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a catalyst and its application in the method for preparing thymol, which solves the problem of poor catalyst reactivity, High cost, short life, complex preparation, harsh reaction conditions, and high equipment requirements

Method used

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  • Catalyst and application of catalyst to method for preparing thymol

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] A catalyst for the alkylation of m-cresol to thymol from commercial γ-Al 2 o 3 Al prepared by precipitation with ammonia water 2 o 3 composition, where Al 2 o 3 / γ-Al 2 o 3 The mass ratio is 1 / 0.5.

[0035] (1) Drop 0.5 mol / L ammonia solution into 500 mL of 1 mol / L aluminum nitrate solution, keep the pH at 7-7.5, and make precipitation solution A;

[0036] (2) Precipitate solution A was stirred at 75 °C for 5 hours, then cooled for 2 hours and then suction filtered; after drying at room temperature for 12 hours, it was dried in an oven at 120 °C for 12 hours; placed in a muffle furnace at 5 °C / min The speed is raised to 550 ℃, and calcined for 6 hours to prepare Al 2 o 3 .

[0037] (3) Al 2 o 3 with purchased commercial gamma-al 2 o 3 Mix, add 200 mL of nitric acid solution and make a slurry, inject the slurry into a specific mold, and dry it at 160 °C. The shaped particles were finally calcined at 620 °C for 2 hours to obtain a spherical catalyst Cat-1 f...

Embodiment 2

[0040] A catalyst for the synthesis of thymol by m-cresol alkylation in Example 1, that is, Al in Cat-1 2 o 3 / γ-Al 2 o 3 The mass ratio of 1 / 0.5 is changed to Al 2 o 3 / γ-Al 2 o 3 =1 / 0.75, and prepare a kind of catalyst that is used for m-cresol alkylation to synthesize thymol with the same preparation method of implementing 1, i.e. Cat-2.

[0041] The results of activity test showed that the conversion rate of m-cresol was 81.7%, the selectivity of thymol was 89.1%, and the conversion rate remained above 50% for 500 h.

Embodiment 3

[0043] A catalyst for the synthesis of thymol by m-cresol alkylation in Example 1, that is, Al in Cat-1 2 o 3 / γ-Al 2 o 3 The mass ratio of 1 / 0.5 is changed to Al 2 o 3 / γ-Al 2 o 3 =1, and prepare a kind of catalyst that is used for m-cresol alkylation to synthesize thymol, i.e. Cat-3 with the same preparation method as implementation 1.

[0044] The results of the activity test showed that the conversion rate of m-cresol was 86.3%, the selectivity of thymol was 84.7%, and the conversion rate remained above 50% for 548 h.

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Abstract

The invention discloses a catalyst. The catalyst is prepared from Al2O3 and gamma-Al2O3 according to a mass ratio of 1 to (0.1-9). The invention also provides a preparation method of the catalyst. The preparation method of the catalyst comprises the following steps: preparing Al2O3 by an ammonia precipitation method, then mixing Al2O3 with commercially purchased gamma-Al2O3, adding a nitrite acid solution into a mixed material, pulping the mixed material, injecting the pulp into a specific die, drying and forming at the temperature of 140-170 DEG C and roasting formed particles at the temperature of 300-1,000 DEG C for 1-10 hours. The invention also discloses a method for preparing thymol by using the catalyst. Compared with a pure commercial formed aluminum oxide catalyst, the catalyst has high specific surface area and pore volume and a variety of acid sites, can be applied to reaction for synthesizing thymol by virtue of alkylation of m-cresol and has high catalytic activity and selectivity; meanwhile, the catalyst is high in stability, long in service life and easy to regenerate.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a catalyst, in particular to a catalyst for synthesizing thymol by m-cresol alkylation and a preparation method thereof. [0002] Background technique [0003] Thymol has a special aroma of thyme or thyme, and is an important raw material for the preparation of menthol. Thymol has antiseptic properties and is less toxic than phenol, and has medicinal value and can be used in oral hygiene products; it also has antifungal and parasitic functions, and can be used to treat wounds, store anatomical specimens, etc.; due to its phenolic odor , is also commonly used in insect repellants. In addition, thymol can also be used as an antioxidant, a special reagent for testing titanium nitride, and a benchmark for comparison of thymol blue. [0004] Before the 1940s, thymol was mainly derived from nature, and it was usually extracted by treating thyme oil, oregano oil, basil oil, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04C07C39/06C07C37/14
Inventor 毛海舫毛东森俞俊解凤贤郭晓明卢冠忠
Owner 上海泾维化工科技有限公司
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