Environment-friendly process for producing dihydromyrcenol by using dihydromyrcene hydration reaction

Abstract

The invention discloses an environment-friendly process for producing dihydromyrcenol by using a dihydromyrcene hydration reaction. The process adopts an integrated system consisting of a jet reaction device, an oil-water separation device and a rectification device. A high-speed injector is adopted in a reactor for reinforcing heat transfer and mass transfer of a reaction process; an acid (containing sulphuric acid, phosphoric acid and p-toluenesulfonic acid) is used as a catalyst and is in closed cycle; and an oil-water separator is arranged in the process flow to reduce the heat load of a rectification tower, and meanwhile the catalyst and the water phase in the oil-water separator are cycled and used in the system together so as to avoid the environment problems caused by the discharge of acid waste water. The process of the invention can improve the conversion rate of dihydromyrcene, and reduce the energy consumption and the production cost. Compared with a mechanical stirring reactor or a fixed bed reactor with the same scale, the process can improve the conversion rate of the dihydromyrcene by 1.2 to 4 times, and reduce the energy consumption of a dihydromyrcenol product per ton by more than 55 percent.

Description

field of invention

[0001] The invention relates to a green process for producing dihydromyrcenol by hydration reaction of dihydromyrcene. technical background

[0002] Dihydromyrcenol is an important fragrance with strong fruity, floral, green, woody and limey aromas, and the aroma has good stability in soaps and detergents. Dihydromyrcenol is generally synthesized by using dihydromyrcene and water as raw materials, and using sulfuric acid or other liquid acids or solid acids such as ion exchange resins as catalysts. Using liquid acid as a catalyst has strong acidity and high catalytic activity, but the reaction product generally needs to be neutralized and washed to remove sulfuric acid in the reaction product. The post-processing process is cumbersome, and waste discharge is easy to cause environmental pollution. Ion-exchange resins have high acid strength, are easy to separate, and can be reused, but have poor mechanical strength and high prices. The direct hydration r...

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