Preparation method of isoprene-based isopentenyl ether

A prenyl isopentenyl ether and inhibitor technology, applied in ether preparation, organic compound preparation, separation methods, etc., can solve the accumulation of heavy components, affect the yield of citral, and affect the long cycle of the device Operation and other issues

Active Publication Date: 2020-10-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But the above method still has the same problem: prenyl isopentenyl ether is prone to rearrangement reaction to generate citral at a higher temperature for a long time, and 3-methyl-2-butene-1-aldehyde di The prenyl alcohol produced after the thermal cracking of prenyl acetal will undergo condensation reaction with citral to generate heavy components, not only the waste liquid rate is as high as 3%, which affects the yield of product citral, but also the heavy components generated are easy to Accumulation on the tower internals affects the long-term operation of the device

Method used

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  • Preparation method of isoprene-based isopentenyl ether
  • Preparation method of isoprene-based isopentenyl ether
  • Preparation method of isoprene-based isopentenyl ether

Examples

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Effect test

Embodiment 1

[0063] The size of the air outlet M130 of the nitrogen mixing device M100 is 5mm, ɑ is 45°, the distance between the air outlets M130 is 15cm, the direction of the air outlets of adjacent coils is opposite, and the distance between the coils is 10cm. The outlet distance is 20cm. The inner diameter of the column in the rectification zone C130 is 300mm. The rectification zone C130 is equipped with Raschig ring packing, the number of theoretical plates is 30, and the diameter of the reduced diameter section is 180mm. The feed inlet is located between the stripping zone C120 and the rectification zone C130, and there are 7 sieve trays below the feed inlet. The circulating liquid return port is located at the 10th theoretical plate from bottom to top in the rectification zone C130. Heat the nitrogen flow 6 to 80°C and introduce it into the nitrogen mixing device M100 at the bottom of the rectification tower C100. The nitrogen flow rate is 3m / s. After the nitrogen flow is stable, s...

Embodiment 2

[0065] The size of the air outlet M130 of the nitrogen mixing device M100 is 1mm, ɑ is 35°, and the distance between the air outlets M130 is 5cm. The outlet spacing is 30cm. The inner diameter of the column in the rectification zone C130 is 300mm. The rectification zone C130 is equipped with Raschig ring packing, the number of theoretical plates is 15, and the diameter of the reduced diameter section is 250mm. The feed inlet is located between the stripping zone C120 and the rectification zone C130, and there are 7 sieve trays below the feed inlet. The circulating liquid return port is located at the 5th theoretical plate from bottom to top in the rectification zone C130. Heat the nitrogen flow 6 to 130°C and introduce it into the nitrogen mixing device M100 at the bottom of the rectification tower C100. The nitrogen flow rate is 5m / s. After the nitrogen flow is stable, start the vacuum unit to reduce the pressure inside the rectification tower C100 to 10kPa (A), the tempera...

Embodiment 3

[0067]The size of the air outlet M130 of the nitrogen mixing device M100 is 0.03mm, ɑ is 75°, the distance between the air outlets M130 is 2cm, the direction of the air outlets of adjacent coils is opposite, and the distance between the coils is 15cm. The distance between the liquid outlets is 50cm. The inner diameter of the column in the rectification zone C130 is 300mm. The rectification zone C130 is equipped with Raschig ring packing, the number of theoretical plates is 10, and the diameter of the reduced diameter section is 200mm. The feed inlet is located between the stripping zone C120 and the rectification zone C130, and there are 30 sieve trays below the feed inlet. The circulating liquid return port is located at the 7th theoretical plate from bottom to top in the rectification zone C130. Heat the nitrogen stream 6 to 180°C and introduce it into the nitrogen mixing device M100 at the bottom of the rectification tower C100. The nitrogen flow rate is 10m / s. After the n...

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Abstract

Provided is a preparation method of isoprene-based isopentenyl ether; a rectifying tower of which the bottom is provided with a nitrogen mixing device for mixing reaction liquid by utilizing nitrogenand carrying out gas stripping is used; according to the method, flash evaporation is carried out on a material extracted from the bottom of the rectifying tower, one part of an evaporated inhibitor is used as a flushing medium, and the other part of the evaporated inhibitor is recycled. According to the method disclosed by the invention, the retention time of the isoprene-based isopentenyl etherunder a high-temperature condition can be remarkably shortened, so that the generation amount of heavy components is reduced, the on-line cleaning of tower internals can be realized, and the accumulation of polymers on the tower internals is reduced.

Description

technical field [0001] The invention relates to a preparation method of isoprenyl isopentenyl ether. Background technique [0002] Isopentenyl isopentenyl ether is an important intermediate for the synthesis of citral by the isobutene method. The citral product produced by this method is not only economical, but also has high atom utilization rate, high product yield and strong competitiveness. [0003] In the patent US4288636, there is an introduction about the preparation of citral intermediate isoprenyl isopentenyl ether, using 3-methyl-2-butene-1-aldehyde di-prenyl acetal to obtain iso-prenyl acetal after thermal cracking Prenyl Prenyl Ether and Prenyl Alcohol, the Prenyl Prenyl Alcohol is continuously distilled to obtain Prenyl Prenyl Ether. [0004] Patent WO2008037693 also uses 3-methyl-2-butene-1-aldehyde di-prenyl acetal obtained by acetalization reaction as raw material, and obtains prenyl isoprenyl acetal through thermal cracking reaction and subsequent vacuum di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/15C07C41/28C07C41/42B01D3/14B01D3/32
CPCC07C41/28C07C41/42B01D3/143B01D3/32C07C43/15Y02P20/584
Inventor 张硕磊张红涛何光文杨国忠刘英俊李广琼方子来马运果纪善振伊健王现亮
Owner WANHUA CHEM GRP CO LTD
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