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A technology of pentamethylindene and indane, which is applied in the field of preparation of pentamethylindane, which can solve the problems of low synthesis yield, influence on reaction effect and low catalytic efficiency of musk musk, achieve excellent catalytic performance and improve purity , the effect of increasing the yield
Pending Publication Date: 2021-08-06
安徽金轩科技有限公司
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Problems solved by technology
[0005] The catalytic efficiency of the existing phosphoric acid or phosphorus pentoxide catalyst is low, and the yield of the prepared pentamethylindane is usually less than 50%, which causes a great waste of raw materials in the production process
[0006] Simultaneously because contain a large amount of impurities such as isopentene dime
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Embodiment 1
[0030] A preparation method of pentamethylindane, the specific method is: mix α-methylstyrene and isopentene evenly in a molar ratio of 1:0.75, then drop the mixed solution into the reaction kettle, the dropping time is 20h, Put phosphomolybdic acid into the reaction kettle, the molar ratio of phosphomolybdic acid to isopentene is 1:0.85, the pressure inside the kettle is normal pressure, keep the temperature at 30°C, keep warm for 2 hours, and react to obtain the crude product of pentamethylindane , use the indane rectification unit to rectify the indane crude product to obtain the pentamethylindane finished product.
Embodiment 2
[0032] A preparation method of pentamethylindane, the specific method is: mix α-methylstyrene and isopentene evenly in a molar ratio of 1:0.75, then drop the mixed solution into the reaction kettle, the dropping time is 20h, Put cross-linked polystyrene-loaded phosphomolybdic acid into the reactor, the molar ratio of cross-linked polystyrene-loaded phosphomolybdic acid to isopentene is 1:0.85, the pressure in the kettle is normal pressure, keep the temperature at 30°C, keep the temperature After reacting for 2 hours, the crude product of pentamethylindane was obtained through the reaction, and the crude product of indane was rectified by using an indane rectification unit to obtain the finished product of pentamethylindane. ;
[0033] Among them, the loading method of cross-linked polystyrene loaded phosphomolybdic acid is: 1) disperse the cross-linked polystyrene powder with a cross-linking degree of 5 into boiling water, add phosphomolybdic acid after stirring evenly, polyst...
Embodiment 3
[0034] Embodiment 3 is different from Embodiment 2 in that,
[0035] The degree of crosslinking of the crosslinked polystyrene powder is 7.
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Abstract
The invention belongs to the technical field of production of chemical products, and particularly relates to a preparation method of pentamethylindane, wherein the preparation method comprises the following steps: S1, synthesis of an indane crude product: uniformly mixing alpha-methyl styrene and isoamylene, dropwise adding the mixed solution into a reaction kettle, adding a catalyst into the reaction kettle, and reacting to obtain pentamethylindane, wherein the catalyst is phosphomolybdic acid; and S2, rectifying of the indane crude product: rectifying the indane crude product by using an indane rectifying unit to obtain the pentamethyl indane finished product. The preparation method has the beneficial effects that the phosphomolybdic acid is used as the catalyst to catalyze the pentamethylindane preparation reaction, and the phosphomolybdic acid is protonic acid formed by taking the regular octahedral metal oxide heteropolyanion as a basic unit, so that the phosphomolybdic acid has stronger acidity and oxidation-reduction property compared with common phosphoric acid, and thus, the phosphomolybdic acid has more excellent catalytic performance, and is beneficial to improving the yield of pentamethylindane.
Description
technical field [0001] The invention belongs to the technical field of chemical product production, and in particular relates to a preparation method of pentamethylindane. Background technique [0002] Jiale musk is the first synthetic musk successfully developed by the International Fragrance and Fragrance Company. The molecular weight of Jiale musk is 258.4, the boiling point is 129°C (107Pa), and the chemical name is 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl ring Penta-γ-2-benzopyran. [0003] Jiale musk has a musky aroma, elegant fragrance, sweet aroma, excellent penetration and diffusion, long-lasting fragrance, and good stability. It is often used in cosmetic creams, lotions, soaps, daily flavors, tobacco flavors, and food flavors In the preparation of cosmetic flavors and fixatives for flavors and fragrances, etc. Because the product has a strong musk aroma, good stability, non-toxicity, will not be absorbed by the internal organs of the human body, can be taken...
Claims
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