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Apparatus and method for synthesizing 2-methoxy-3,4-dihydropyran

A dihydropyran and methoxy technology, applied in the chemical industry, can solve problems such as blockage, affecting the health of employees and surrounding personnel, and achieve the effect of uniform temperature rise and improved production yield.

Active Publication Date: 2022-05-03
荆州市新景化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for synthesizing 2-methoxyl-3,4-dihydropyran are all to directly place acrolein, vinyl methyl ether and polymerization inhibitor in the pipeline reactor for reaction, which has the following disadvantages: Polymers often block the reactor, so in order to clear the pipeline, however, there is often unreacted raw material acrolein in the reaction, and the strong and irritating toxic smell of acrolein will affect the health of employees and surrounding personnel

Method used

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  • Apparatus and method for synthesizing 2-methoxy-3,4-dihydropyran

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for synthesizing 2-methoxy-3,4-dihydropyran, comprising the following steps:

[0038] S1. Put 1.5 tons of acrolein, 1.5 tons of vinyl methyl ether and 3 kg of inhibitor hydroquinone into the reaction kettle through the feeding pipe, open the gas storage tank, and feed nitrogen into the reaction kettle to make the reaction The pressure in the kettle is 1Mpa;

[0039] S2. Pass steam into the second jacket through the steam inlet, and at the same time, pass cooling water with a temperature of 8°C through the water inlet to the water inlet pipe at the right time, so that the temperature in the reactor will rise to 160°C within 9 hours and keep for 2 hours. ;

[0040]S3, then open the first valve on the connecting pipe, the unreacted acrolein and vinyl methyl ether gas in the reactor enter the recovery tank, and at the same time, pass the low-temperature liquid into the first jacket through the liquid inlet, such as Liquid nitrogen, etc., the temperature in the re...

Embodiment 2

[0042] A method for synthesizing 2-methoxy-3,4-dihydropyran, comprising the following steps:

[0043] S1. Add 1 ton of acrolein, 1 ton of vinyl methyl ether and 1 kg of polymerization inhibitor phenothiazine into the reactor through the feed pipe, open the gas storage tank, and feed nitrogen into the reactor to make the reactor The pressure inside is 3Mpa;

[0044] S2. Pass steam into the second jacket through the steam inlet, and at the same time, pass cooling water at a temperature of 5°C through the water inlet to the water inlet pipe at the right time, so that the temperature in the reaction kettle is raised to 120°C within 9 hours and kept for 2 hours. ;

[0045] S3, then open the first valve on the connecting pipe, the unreacted acrolein and vinyl methyl ether gas in the reactor enter the recovery tank, and at the same time, pass the low-temperature liquid into the first jacket through the liquid inlet, such as Liquid nitrogen, etc., the temperature in the recovery tan...

Embodiment 3

[0047] A method for synthesizing 2-methoxy-3,4-dihydropyran, comprising the following steps:

[0048] S1. Put 2 tons of acrolein, 2 tons of vinyl methyl ether and 4 kg of polymerization inhibitor p-methoxyphenol into the reaction kettle through the feed pipe, open the gas storage tank, and feed nitrogen into the reaction kettle to The pressure in the reactor is 5Mpa;

[0049] S2. Pass steam into the second jacket through the steam inlet, and at the same time, pass cooling water with a temperature of 8°C through the water inlet to the water inlet pipe at the right time, so that the temperature in the reaction kettle is raised to 100°C within 9 hours and kept for 2 hours. ;

[0050] S3, then open the first valve on the connecting pipe, the unreacted acrolein and vinyl methyl ether gas in the reactor enter the recovery tank, and at the same time, pass the low-temperature liquid into the first jacket through the liquid inlet, such as Liquid nitrogen, etc., the temperature in the...

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Abstract

The present invention proposes a device for synthesizing 2-methoxy-3,4-dihydropyran, and a recovery tank is provided, so that the acrolein and vinyl methyl ether gases in the reaction kettle can enter the recovery tank and condense, This can avoid that when the reactor needs to be dredged, the acrolein gas in the reactor will affect the health of employees and surrounding personnel; Steam heating thereby makes the temperature rise of the reaction kettle more uniform; ‑Dihydropyran, the unreacted acrolein and vinyl methyl ether gas in the reactor enter the recovery tank and condense, and then enter the reactor again for further reaction to synthesize 2‑methoxy‑ 3,4‑dihydropyran can make full use of raw materials and improve the production yield.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a device and method for synthesizing 2-methoxy-3,4-dihydropyran. Background technique [0002] Glutaraldehyde is the most widely used sterilizing and virus-killing product in recent years, and its synthesis process by hydrolysis of 2-methoxy-3,4-dihydropyran is currently the lowest-cost production method. At present, the methods for synthesizing 2-methoxyl-3,4-dihydropyran are all to directly place acrolein, vinyl methyl ether and polymerization inhibitor in the pipeline reactor for reaction, which has the following disadvantages: Polymers often block the reactor, so in order to dredge the pipeline, however, there is often unreacted raw material acrolein in the reaction, and the strong and irritating toxic smell of acrolein will affect the health of employees and surrounding personnel. [0003] Based on the above risks, it is necessary to improve the existing device for synthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/04C07D309/30
CPCB01J3/04C07D309/30
Inventor 易光政阎璟琪焦革明江柏生王家祥张仕军
Owner 荆州市新景化工有限责任公司
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