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Preparation method and production system of ethylene glycol monovinyl ether

A technology of ethylene glycol monovinyl ether and production system, which is applied in ether preparation, unsaturated compound addition to prepare ether, organic chemistry, etc., can solve problems such as low efficiency, avoid by-products, reduce operation difficulty, design scientifically sound effects

Pending Publication Date: 2022-03-25
ZHEJIANG HUANGMA TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process requires a high volume of recycled acetylene, and the reaction cycle is as long as six days, with low efficiency

Method used

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  • Preparation method and production system of ethylene glycol monovinyl ether
  • Preparation method and production system of ethylene glycol monovinyl ether
  • Preparation method and production system of ethylene glycol monovinyl ether

Examples

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preparation example Construction

[0035] A kind of preparation method of ethylene glycol monovinyl ether, its technological process is as figure 1 As shown, it specifically includes the following steps:

[0036] S1. Add the catalyst and ethylene glycol into the high-pressure gas-liquid mass transfer reactor, and pass inert gas to replace the air in all equipment and pipelines; the reactor is turned on and stirred and heated to the reaction temperature T1, and vacuum dehydration is carried out. Make the water content of the system lower than 10ppm;

[0037] S2. Pass acetylene and inert gas into the reaction kettle through the compressor, so that the pressure in the kettle reaches the initial reaction pressure P1; as the reaction progresses, the acetylene is continuously consumed, and the pressure in the kettle drops slowly during the reaction. When the pressure in the kettle After keeping stable, open the condensation valve between the reactor and the condenser;

[0038] S3. Adjust the temperature in the kett...

Embodiment 1

[0046] A preparation method of ethylene glycol monovinyl ether, comprising the following steps:

[0047] Add 1500g (24.2mol) ethylene glycol and 78.8g potassium hydroxide into the reaction kettle, stir and raise the temperature to 150°C, and vacuum dehydrate for 2h. Acetylene and nitrogen are passed into the reactor at a volume ratio of 1:1, so that the initial reaction pressure reaches 1.0 MPa. After the pressure in the kettle no longer drops within 30 minutes, open the condensation valve of the reactor and the condenser, adjust the temperature in the kettle to 120°C, and feed nitrogen gas into the bottom of the reactor at a rate of 130 L / h for 30 minutes. Close the condensation valve of the reactor and the condenser, readjust the temperature in the reactor to 150°C, and then pass acetylene and nitrogen into the reactor at a volume ratio of 1:1, so that the initial reaction pressure reaches 1.0MPa again, and repeat the above process. When the total input amount of acetylene...

Embodiment 2

[0050] A preparation method of ethylene glycol monovinyl ether, comprising the following steps:

[0051] Add 1500g (24.2mol) of ethylene glycol and 7.5g of potassium hydroxide into the reaction kettle, stir and raise the temperature to 180°C, and vacuum dehydrate for 2h. Acetylene and nitrogen are passed into the reactor at a volume ratio of 4:1, so that the initial reaction pressure reaches 0.4MPa. After the pressure inside the kettle no longer drops within 30 minutes, open the condenser valves of the reactor and the condenser, adjust the temperature inside the kettle to 160°C, and feed nitrogen gas into the bottom of the reactor at a rate of 60 L / h for 30 minutes. Close the condensation valve of the reactor and the condenser, readjust the temperature in the reactor to 180°C, and then pass acetylene and nitrogen into the reactor at a volume ratio of 4:1, so that the initial reaction pressure reaches 0.4MPa again, and repeat the above process. When the total input amount of ...

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Abstract

The invention discloses a preparation method and a production system of ethylene glycol monovinyl ether, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: taking acetylene and ethylene glycol as raw materials, intermittently introducing acetylene into ethylene glycol containing a catalyst, carrying out pressurized reaction in a high-pressure closed reaction kettle, and adding inert gas as shielding gas of acetylene; by intermittently carrying out gas stripping, condensation and recovery of the product in the reaction process, generation of side reactions can be effectively avoided, so that the product selectivity is improved. The preparation method disclosed by the invention is simple to operate, high in conversion rate, few in byproducts and relatively high in reaction selectivity and safety.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of ethylene glycol monovinyl ether and a production system thereof. Background technique [0002] Ethylene glycol monovinyl ether, also known as 2-ethyleneoxyethanol, belongs to vinyl ether compounds. It is prone to cationic polymerization under the action of catalysis. The new polymer material produced with it as raw material has good adhesion, Miscibility and solubility and other properties, so it is an important organic synthesis intermediate in industry. Its applications include: (1) As a comonomer of fluororesins, it is widely used in aerospace, industrial engineering, textile finishing, special protective coatings, microelectronics and other fields; (2) It is used as a reactive diluent in radiation-cured high-end coatings; (3) As a polycarboxylate superplasticizer polyether monomer initiator, it is used in high-speed rail projects, cross-sea ...

Claims

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Application Information

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IPC IPC(8): C07C41/08C07C43/178
CPCC07C41/08C07C43/178
Inventor 孙常庚王马济世裘碧菡王陆成
Owner ZHEJIANG HUANGMA TECH
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