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New progress has been made in the synthetic fragrance project of Shandong Xinhecheng Pharmaceutical Co., Ltd.; the project, with an annual production capacity of 77,815 tons of synthetic fragrances, has had its second environmental impact assessment made public on relevant websites. Product layout of the project: Upon completion, the project will have the following production capacity: 17,000 tons per year of 2-methyl-3-butyne-2-alcohol (with a purity of 70%), and 6,500 tons per year of 2-methyl-3-butyne-2-alcohol (with a purity of 99%). The annual production capacity is 19,065 tons of dehydrolinalool, 22,000 tons of methyl heptenone, and 9,000 tons of linalool; simultaneously, 250 tons of composite fragrances are produced as a by-product. An annual production of 1,000 tons of avobenzone. An annual production of 2,000 tons of α-isomethyl violet ketone and 1,000 tons of α-normethyl violet ketone. The project construction plan calls for the project to be built in four phases. Among them, Phase 1 of the project will involve the expansion of a facility capable of producing 14,000 tons of synthetic flavors per year, 16,000 tons of isopentenol per year, and 5,000 tons of linalool per year. During the construction process, 28 sets of existing equipment such as gas tanks, compressors, and reaction vessels will be utilized. This project primarily uses ** and acetylene as raw materials. The process involves carrying out an alcoholation reaction using acetylene and ** to obtain 2-methyl-3-butyn-2-ol (with a purity of 70%), followed by a dehydration step to yield 2-methyl-3-butyn-2-ol (with a purity of 99%). Application areas of the product: 2-Methyl-3-butyne-2-ol is an important intermediate in organic synthesis, possessing dual reactivity due to both the alkyne group and the hydroxyl group. In the field of pharmaceutical synthesis, it can be used as an intermediate in the production of the antidepressant drug Veranamine; it participates in Sonogashira coupling reactions and cyclization reactions, and is utilized as an intermediate for synthesizing drugs used to treat atrial fibrillation or hypertension. In the fields of pesticides and fragrances, it can be used to synthesize DV pyrethrin (a pyrethroid pesticide) and linalool (a fragrance), among others. In the materials industry, it can be used as a polymerization inhibitor in the platinum-catalyzed silane addition reaction during the production of silicone rubber, to prevent excessive polymerization. In the coatings and plastics industries, it can be used as an acid etching inhibitor and a viscosity stabilizer. Furthermore, it can also be used as a stabilizer for chlorinated solvents to improve their chemical stability, as well as as a polymer monomer or heat transfer medium. Dehydrolinalool: In the fragrance industry, it can be used directly as a raw material for cosmetics fragrances, imparting floral and green notes, and is commonly employed in perfume and detergent formulations. At the same time, it is a precursor to linalool, one of the most widely used terpenoid fragrances in the world. The double bond structure of dehydrolinalool can be used to synthesize intermediates for vitamins A and E. Its derivatives possess anthelmintic activity and can be used as enhancers for natural pesticides. Furthermore, violet ketone compounds (such as α-isomethylviolet ketone) can be prepared through cyclization reactions, or they can be esterified to yield ester fragrances (such as dehydrocitronellyl acetate).