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Novel method for producing dihydromyrcenol

A technology of dihydromyrcenol and dihydromyrcene, which is applied in the field of continuous production of dihydromyrcenol, can solve the problems of solid catalyst pulverization, decreased reaction rate, and long reaction time, so as to improve selectivity and reduce equipment Corrosion, the effect of reducing production costs

Inactive Publication Date: 2010-12-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is easy to pulverize the solid catalyst by using a batch stirring tank, and the conversion rate of the reaction will be limited by the reaction balance
And adopt batch type fixed-bed reactor though can overcome the above-mentioned shortcoming, but to the later reaction rate decline, part of dihydromyrcenol product also can be converted into other products, thereby cause reaction time longer and selectivity is lower

Method used

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  • Novel method for producing dihydromyrcenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The reaction tower 11 is filled with Amberlyst 35 cation exchange resin, and the rectification towers 8 and 16 are filled with high-efficiency packing of BX corrugated wire mesh. Send deionized water and dioxane solvent into the evaporation kettle 9 according to the volume ratio of 1:2 through the pump 6 and the pump 7. The total addition is 0.8 of the volume of the evaporation kettle. After the feeding, stop the pump 6 and the pump 7 and start the evaporation. Stirring and heating of the still; the reflux rate of the control separation tower 8 is 1 / 8 of the total evaporation capacity. After the separation tower 8 and the reaction tower 11 are all refluxed normally, start the pump 5 and add dihydromyrcene and dihydromyrcene continuously to the reaction device. The purity of myrcene is 85% (wt%). The temperature of the reaction tower is controlled at 85°C. After 3 hours of feeding, the valve 12 is opened, and part of the oil-water mixture is pumped out to the stratifier 1...

Embodiment 2

[0031]Similar to the operation method of Example 1, the difference is that the solvent is isopropanol, the volume ratio of the solvent to deionized water is 1:1, and the HZSM-5 zeolite catalyst bundled in the reaction tower is used to solve the problem of powder The problem of packing zeolite in a fixed bed. Dihydromyrcene in the evaporator: water: solvent = 1:1:1. Other operating steps are the same as in Example 1, and the single pass conversion rate of this process is 57 ~ 58%, and the selectivity is 95%.

Embodiment 3

[0033] Similar to the operation method of Example 1, the difference is that butanone is used as the solvent, the volume ratio of the solvent to deionized water is 1:1, and the dihydromyrcene in the evaporation kettle: water: solvent = 1:1:1. Other operating steps are the same as in Example 1, and the single pass conversion rate of this process is 55 ~ 56%, and the selectivity is 92%.

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Abstract

The invention discloses a novel method for producing dihydromyrcenol. The dihydromyrcenol is continuously produced through direct hydration by adopting a rectification-reaction coupling process and taking dihydromyrcene as a raw material. The process can be used for enhancing the yield of the dihydromyrcenol and the production capacity of equipment and reducing the energy consumption and the production cost; and in addition, compared with other processes, the process is easy to realize the automation of the production process and achieves the purpose of stably producing high-purity dihydromyrcenol products.

Description

technical field [0001] The invention specifically relates to a method for continuously producing dihydromyrcenol using dihydromyrcene as a raw material. Background technique [0002] Dihydromyrcenol has a strong fruity, floral, green, woody and lime-like aroma. It has good stability in soaps and detergents. It is widely used in the deployment of citrus and cologne flavors. Sometimes It can also be used in floral fragrances such as cloves, and its aroma cannot be replaced by other spices, so it is a widely used bulk monoterpene floral fragrance. At present, the annual demand worldwide is 5000t, and the domestic demand is about 100t, and the demand is growing rapidly. [0003] Dihydromyrcenol is generally produced by direct hydration of dihydromyrcene and water as raw materials under the catalysis of liquid acid (such as sulfuric acid or phosphoric acid) or solid acid (such as cation exchange resin). Using liquid acid as a catalyst, although the catalyst activity is high, t...

Claims

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Application Information

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IPC IPC(8): C07C33/025C07C29/04C07C29/80
Inventor 邱挺王碧玉郑辉东王莹淑吴燕翔
Owner FUZHOU UNIV
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