Production method of dihydrolaurenol by adopting mechanical steam re-compression

A technology of dihydromyrcenol and dihydromyrcene, which is applied in the production field of dihydromyrcenol, and can solve the problems of large consumption of refrigerant and heat medium in the condenser

Active Publication Date: 2019-05-21
厦门中坤化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process consumes a lot of heat medium, and at the same time, the co

Method used

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  • Production method of dihydrolaurenol by adopting mechanical steam re-compression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dihydromyrcene, water and acetone are poured into the reaction kettle 1 at a ratio of 1:1:2. After starting the stirring, turn on the steam to heat. When the temperature reaches 80°C, the azeotrope is vaporized, and enters the compressor 4 through the conduit, and the compressor 4 The inlet pressure is 101kPa, start the compressor 4, adjust the frequency of the compressor 4 to 33, so that the outlet pressure is stable at 170kPa, after pressurization, the gas enters the falling film evaporator from the air duct 5, the inlet of the shell side, and the materials in the reactor 1 start the first The material circulation pump 6 and the second material circulation pump 7 circulate, the circulation volume is controlled at 1:1.5, and the temperature difference of the falling film heat exchanger 5 is 5°C. After the vapor-liquid two-phase is heat-exchanged by the condenser 3, the gas phase is condensed and then the third material is used The circulating pump 8 is driven into the c...

Embodiment 2

[0035] Dihydromyrcene, water, and methanol are poured into the reaction kettle 1 in a ratio of 1:1:2. After starting the stirring, turn on the steam to heat. When the temperature reaches 80°C, the azeotrope is vaporized, and enters the compressor 4 through the conduit, and the compressor The inlet pressure is 101kPa, start the compressor 4, adjust the frequency of the compressor 45, so that the outlet pressure is stable at 200kPa, after pressurization, the gas enters the inlet of the shell side of the falling film heat exchanger 5 from the gas guide pipe, and the first material of the reactor is started The circulation pump 6 and the second material circulation pump 7 circulate, the circulation volume is controlled at 1:1.5, and the temperature difference of the falling film heat exchanger 5 is 6.1°C. After the gas-liquid two-phase heat exchange through the condenser 3, the gas phase is condensed and then the third material is used The circulating pump 8 is driven into the cataly...

Embodiment 3

[0037] Dihydromyrcene, water, and tetrahydrofuran are poured into the reaction kettle 1 at a ratio of 1:1:2. After starting the stirring, turn on the steam to heat. When the temperature reaches 80°C, the azeotrope is vaporized and enters the compressor 4 through the conduit. The compressor The inlet pressure of 4 is 101kPa, start compressor 4, adjust the frequency of compressor 4 to 35, so that the outlet pressure is stable at 170kPa, after pressurization, the gas enters the shell side inlet of falling film heat exchanger 5 from the air guide pipe, and the material of reactor 1 starts The first material circulation pump 6 and the second material circulation pump 7 circulate, the circulation volume is controlled at 1:2, and the temperature difference of the falling film heat exchanger 5 is 4.7°C. After the vapor-liquid two-phase is heat-exchanged by the condenser 3, the gas phase is condensed and used The 3rd material circulation pump 8 is driven into catalytic bed 2, and the ca...

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Abstract

The invention provides a production method of dihydrolaurenol by adopting mechanical steam re-compression and relates to the dihydrolaurenol. The production method comprises the following steps: heating dihydrolaurene, water and an organic solvent in a reaction kettle through a heating medium, then evaporating and enabling initially-evaporated steam to directly enter a compressor for compression;improving the pressure of the steam from 101 kPa to 160-200 kPa, entering a shell side of a falling film heat exchanger, performing forced circulation on a mixed material in the reaction kettle through first and second material circulation pumps, respectively extracting an oil phase and a water phase, entering from the top of a tube side of the falling film heat exchanger, performing heat exchangeon a vapor phase and a liquid phase in a condenser, condensing the pressurized gas phase into liquid, entering a catalytic bed through a third material circulation pump, performing catalytic reactionand then flowing back to the reaction kettle; heating and vaporizing forced circulation liquid in the condenser, introducing evaporated gas and un-vaporized liquid into the reaction kettle, then enabling the gas phase to enter the compressor through a gas guide pipe for re-pressurization, improving the heat and circulating for a plurality of times until the reaction ends.

Description

technical field [0001] The present invention relates to dihydromyrcenol, in particular to a process for the production of dihydromyrcenol using mechanical vapor recompression. Background technique [0002] Dihydromyrcenol (2,6-dimethyl-7-octen-2-ol) is an important spice with strong fruity, floral, green, woody and white lemon aromas. Good stability in soaps and detergents. Due to its unique aroma quality, it is widely used in spice formulations and has a broad market prospect. Its production process has two-step method and one-step method; the two-step method is a traditional process with low energy consumption, but the production process uses a lot of acid, process wastewater is much, and the cost of environmental protection treatment is high, which has been gradually eliminated by the one-step method; the one-step method is generally Under the action of water and organic solvent, the azeotrope passes through the catalytic bed for dihydromyrcene, and is hydrated under th...

Claims

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Application Information

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IPC IPC(8): C07C33/025C07C29/04
Inventor 郑艺辉郑启航魏文达张剑平
Owner 厦门中坤化学有限公司
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