Production methodsThe synthesis method involves many organic reactions, which can be mainly classified into several categories, such as oxidation, reduction, esterification, substitution, condensation, addition, cyclization and isomerization. Because as long as there are trace impurities with unpleasant odor in synthetic fragrances, the overall quality will be destroyed, therefore, the refining of synthetic fragrances is an extremely important problem, and the commonly used refining methods are vacuum distillation and crystallization.

The production of synthetic fragrances in China developed after the 50s of the 20th century, and was concentrated in Shanghai, Tianjin and other places. The main raw materials used in the production are citronella oil, litsea cubeba seed oil, linalomy oil, sassafras oil, cypress oil, turpentine, castor oil, fusel oil, aromatics and phenols. There are more than 600 kinds of large and small products, among which vanillin, coumarin, phenethyl alcohol, jasmine aldehyde and artificial sandalwood have a considerable reputation in the international market.

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The main use is for blending flavors, which are also known as blending fragrances. Plant-based spices are often added to stews, for example, to give food a strong flavor. Fragrances and flavors are widely used in soaps, detergents, various cosmetics (cold cream, alabaster, hair cream, hair wax, shampoo, toilet water and perfume, etc.), skin care and beauty products, toothpaste, air cleaners and fungicides and other environmental hygiene products, candy, biscuits, beverages, tobacco, wine, soy milk, dairy products, vegetable protein food, as well as medicine, paper, plastics, leather, fabrics, etc.

Application of ancient spices

Originating in the Pamirs, spices are closely associated with the origins of religion, and the gods breathe in these fragrances through the ritual of incense, bringing themselves closer to the gods. The Pamir Plateau is a necessary place on the ancient Silk Road, located in the southeast of Central Asia, the west of China, across Tajikistan, China and Afghanistan. It can be seen that the four ancient civilizations of ancient times were the first countries to apply spices. The fragrant aroma means to be able to be close to the gods, represents nobility, means health, and also symbolizes wealth, from life to death The ancient Egyptians could not do without incense, 3000 years ago, the ancient Egyptians used spices to smear the corpse to make mummies, they believed that the soul would be attached to the corpse or statue after death, and the destruction of the body meant the death of the soul, so as long as the body was preserved, the soul had a place to live, and the dead could be reincarnated. So why can the mummy not rot for thousands of years, according to research, spices with antiseptic effects play a great role.

Spices, especially spices like agarwood and sandalwood, are used for smoking, and the aroma produced when they are used for smoking is not only fragrant and elegant, but also very helpful to the health of the human body, which can play a role in refreshing the mind, soothing emotions, removing troubles, smoothing breathing, assisting sleep, regulating endocrine and many other health care effects. The ancients often used it as a good companion for self-cultivation and health preservation. In addition, incense can effectively kill mold in the room when used in home life, play a role in driving away evil spirits and purifying the air, which is part of the reason why incense is often used in the palace to prevent plague. originally had a good meaning, but to a certain extent, it has become a harmful thing. And Yuyan did not use spices after she was pregnant, and she did not burn incense and had no other taste at all. In addition, he was extra careful and attentive to his diet, and finally gave birth to a child peacefully.