A kind of method for continuously preparing 2,3,5-trimethylbenzoquinone
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A technology for refining trimethylbenzoquinone and oil phase, which is applied in the preparation of oxidized quinone, separation/purification of quinone, organic chemistry, etc. It can solve problems that are not suitable for industrial applications, achieve good heat and mass transfer characteristics, and improve utilization rate , the effect of improving safety
Active Publication Date: 2020-06-16
吴嘉
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This method not only needs a variety of additives, but also has 10% to 20% 2,3,5-trimethylbenzoquinone residue in the mother liquor, which is not suitable for industrial application
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Embodiment 1
[0024] A method for continuously preparing 2,3,5-trimethylbenzoquinone, such as figure 1 As shown, it specifically includes the following steps:
[0025] 1) In the reaction process, the reaction raw material 2,3,6-trimethylphenol is dissolved in a mixed solvent composed of an organic solvent and water, the composite catalyst copper chloride and lithium chloride are dissolved in water, and the oxidizing agent is industrial pure oxygen, which enters Oxidation reaction takes place in the packed bed oscillating flow reactor, the reaction temperature is controlled at 40-80°C, the pressure is controlled at 0.1-1.0MPa (absolute pressure), and the simultaneous production of 2,3,5-trimethylbenzoquinone and organic solvents is obtained. The oil phase containing a small amount of catalyst and water, and the water phase mainly containing water and catalyst and containing a small amount of organic solvent and 2,3,5-trimethylbenzoquinone, enter the oil phase refining process and water phase...
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Abstract
The invention discloses a method for continuously preparing 2,3,5-trimethylquinone. The method comprises a reaction process, an oil phase refining process and a water phase refining process. The reaction process comprises the following steps: a reaction raw material and a catalyst are in oxidizing reaction in a packed bed oscillatory flow reactor to obtain an oil phase and a water phase mainly comprising 2,3,5-trimethylquinone; the oil phase refining process comprises the following steps: the oil phase after the reaction passes through an oil phase desalting extracting tower and a gas stripping light component removal tower and then passes through a decompression rectifying tower to obtain a 2,3,5-trimethylquinone product at the tower top; the water phase refining process comprises the following steps: a water phase material sequentially passes through a dealcoholization rectifying tower, a recycling extracting tower and a cyclohexane rectifying tower to obtain 2,3,5-trimethylquinone. With adoption of the method, the continuity of reaction and separation process of 2,3,6-trimethylphenol is realized, and the problems that the production efficiency is low, the operating strength is high, the product quality is not stable, and the process potential safety hazard is large are solved.
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, in particular to a method for continuously preparing 2,3,5-trimethylbenzoquinone. Background technique [0002] 2,3,5-Trimethylbenzoquinone is an important intermediate in the synthesis of vitamin E. Vitamin E is an important fat-soluble biological antioxidant, which is widely used in medicine, health care products, food, cosmetics, animal husbandry and other fields. With the gradual growth of domestic and foreign markets for vitamin E, the demand for trimethylbenzoquinone is also increasing. [0003] At present, 2,3,5-trimethylbenzoquinone is mainly obtained by oxidizing 2,3,6-trimethylphenol in China. The traditional production process first uses 40% sulfuric acid to sulfonate 2,3,6-trimethylphenol, and then oxidizes it with manganese dioxide to produce 2,3,5-trimethylbenzoquinone. Although the pr...
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