Method for synthesizing 2,3,5-trimethylbenzoquinone and 2,3,5-trimethylhydroquinone
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of trimethylhydroquinone and trimethylbenzoquinone, which is applied in chemical instruments and methods, preparation of quinone oxides, preparation of organic compounds, etc., can solve the problems of high technical requirements and short process, and achieve simple steps, The effect of low equipment requirements and few by-products
Inactive Publication Date: 2011-10-19
YANGZHOU UNIV
View PDF0 Cites 12 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
The process has the advantages of short process, high product yi
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0026] Dissolve 2g of 2,3,6-trimethylphenol in 20ml of acetonitrile, add it into a three-necked flask, weigh 0.1g of Cu-SBA-15 mesoporous molecular sieve into the flask, heat it in a water bath to 50°C, add 3ml of 30% Hydrogen peroxide, start timing, react for 3h. The final conversion rate was 6.6%, the selectivity to TMBQ was 62.0%, and the selectivity to TMHQ was 18.9%.
Embodiment 2
[0028] Dissolve 2g of 2,3,6-trimethylphenol in 20ml of acetonitrile, add it into a three-necked flask, weigh 0.1g of Cu-SBA-15 mesoporous molecular sieve into the flask, heat it in a water bath to 60°C, add 3ml of 30% Hydrogen peroxide, start timing, react for 3h. The final conversion rate was 12.0%, the selectivity to TMBQ was 59.4%, and the selectivity to TMHQ was 18.9%.
Embodiment 3
[0030] Dissolve 2g of 2,3,6-trimethylphenol in 20ml of acetonitrile, add it into a three-necked flask, weigh 0.1g of Cu-SBA-15 mesoporous molecular sieve into the flask, heat it in a water bath to 70°C, add 3ml of 30% Hydrogen peroxide, start timing, react for 3h. The final conversion rate was 25.9%, the selectivity to TMBQ was 54.3%, and the selectivity to TMHQ was 21.9%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention provides a method for synthesizing 2,3,5-trimethylbenzoquinone and 2,3,5-trimethylhydroquinone. In the method, the 2,3,5-trimethylbenzoquinone and the 2,3,5-trimethylhydroquinone are prepared by oxidizing reaction at the temperature of between 50 and 80 DEG C in the presence of a Cu-SBA-15 mesoporous molecular sieve serving as a catalyst, H2O2 serving as an oxidant and acetonitrile serving as a solvent. In the method, the reaction process is simple, and the equipment requirement is low; the Cu-SBA-15 mesoporous molecular sieve is used as the catalyst, contributes to the dispersion of products and is easy to separate; and the H2O2 is used as the oxidant, and the byproduct is H2O, so that the method is environment-friendly.
Description
technical field [0001] The invention relates to the technical field of chemical synthesis technology, in particular to the synthesis technology of 2,3,5-trimethylbenzoquinone (TMBQ) or 2,3,5-trimethylhydroquinone (TMHQ). Background technique [0002] 2,3,5-Trimethylhydroquinone is an important intermediate for the synthesis of vitamin E. 2,3,5-Trimethylbenzoquinone can be reduced to 2,3,5-Trimethylhydroquinone. Vitamin E is widely used in medicine, health products, food, cosmetics, animal husbandry and other fields. [0003] At present, the synthetic methods of 2,3,5-trimethylhydroquinone mainly contain the following types: [0004] (1) Trimethylbenzene method [0005] Trimethylbenzene undergoes sulfonation, nitration, and hydrogenation reduction to 1,2,4-trimethyl-3,6-diaminobenzenesulfonic acid, and then oxidizes to 2,3,5-trimethylbenzoquinone , and finally hydrogenation reduction to obtain 2,3,5-trimethylhydroquinone. [0006] [0007] This process route has the ad...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more