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Catalyst for synthesizing propylene glycol ether and preparation method thereof

A propylene glycol ether and catalyst technology, which is applied in ether preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc., can solve the problems of strong corrosion, large amount of three wastes generated, and difficulty in recycling catalysts, etc. Achieve the effect of less by-products, low production cost and easy separation

Active Publication Date: 2020-04-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the synthesis of propylene glycol ether in the industry mostly uses traditional strong alkaline catalysts sodium (potassium) alcoholate and sodium hydroxide, but these catalysts have the disadvantages of strong corrosion, large amount of three wastes, and difficulty in recycling catalysts.

Method used

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  • Catalyst for synthesizing propylene glycol ether and preparation method thereof
  • Catalyst for synthesizing propylene glycol ether and preparation method thereof
  • Catalyst for synthesizing propylene glycol ether and preparation method thereof

Examples

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preparation example Construction

[0016] The embodiment of the present invention also provides the preparation method of the above-mentioned catalyst for synthesizing propylene glycol ether, the method comprises the following steps:

[0017] Add azobisisobutyronitrile to the ethyl acetate solution of 1-vinylimidazole with a concentration of 0.5~1.2mol / L, N 2 Or heated to 65-90°C under inert gas, kept for 0.5-2h, then added divinylbenzene ethyl acetate solution, kept at 65-90°C for 12-24h, cooled, and the product was dried to obtain the synthetic propylene glycol ether The catalyst, wherein the azobisisobutyronitrile is added in an amount of 0.01-5 wt% of 1-vinylimidazole, and the molar ratio of 1-vinylimidazole to divinylbenzene is 1:0.01-20.

[0018] Preferably, the added amount of azobisisobutyronitrile is 0.2-0.6 wt% of 1-vinylimidazole, and the molar ratio of 1-vinylimidazole / divinylbenzene is 1:0.2-3. More preferably, the added amount of azobisisobutyronitrile is 0.3-0.5 wt% of 1-vinylimidazole, and the ...

Embodiment 1

[0022] Synthesis of polyvinylimidazole-divinylbenzene (PVIM-DVB):

[0023] 2.3g vinylimidazole, 0.02g azobisisobutyronitrile dissolved in 30mL ethyl acetate, N 2 Purge and replace air for 30min, and heat to 90°C for 1h; then add 2.3g of divinylbenzene in ethyl acetate solution dropwise, react for 24h, cool to room temperature, move to a vacuum drying oven, and dry at 60°C for 24h , to obtain pale yellow solid PVIM-DVB. Its infrared characterization is as follows figure 2 , showing the characteristic absorption peaks of VIM and DVB units, 1650cm -1 The peak at is the stretching vibration peak of the imidazole unit C=N bond, 1500cm -1 The peak at is the stretching vibration peak of the C=C bond between the imidazole ring and the benzene ring, 900cm -1 、650cm -1 The peak at is the out-of-plane stretching vibration peak of the C-H bond on the benzene ring. The appearance of these characteristic peaks fully shows that the monomer VIM and DVB have been cross-linked and copoly...

Embodiment 2

[0025] Synthesis of polyvinylimidazole-divinylbenzene (PVIM-DVB):

[0026] 2.3g vinylimidazole, 0.02g azobisisobutyronitrile dissolved in 30mL ethyl acetate, N 2 Purge and replace the air for 30min, and heat to 90°C for 1h; then add dropwise an ethyl acetate solution containing 4.6g of divinylbenzene, react for 24h, cool to room temperature, move to a vacuum drying oven, and dry at 60°C for 24h , to obtain light yellow solid PVIM-DVB.

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Abstract

The invention relates to the technical field of chemical catalysis. The invention discloses a catalyst for synthesizing propylene glycol ether. The catalyst is polyvinyl imidazole-divinyl benzene. A preparation method of the catalyst comprises the following steps: adding azodiisobutyronitrile into an ethyl acetate solution of 1-vinylimidazole with the concentration of 0.5-1.2 mol / L, heating the solution to 65-90 DEG C in the presence of N2 or inert gas, maintaining the temperature for 0.5-2 hours, adding an ethyl acetate solution of divinyl benzene into the solution, keeping the temperature at65-90 DEG C for 12-24 hours, and cooling and drying the product to obtain the catalyst for synthesizing propylene glycol ether, wherein the addition amount of azodiisobutyronitrile is 0.01-5wt% of that of 1-vinylimidazole, and the molar ratio of 1-vinylimidazole to divinylbenzene is 1: (0.01-20). The obtained catalyst for synthesizing propylene glycol ether has the advantages of high activity, high selectivity, low energy consumption, easiness in separation and the like, is low in production cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and in particular relates to a catalyst for synthesizing propylene glycol ether and a preparation method. Background technique [0002] Propylene glycol ether, especially propylene glycol methyl ether (PGME), has two functional groups with strong solubility in its chemical structure—ether bond and hydroxyl group, which are both hydrophobic and hydrophilic, so propylene glycol methyl ether can be used as an excellent performance Universal solvent, commonly known as universal solvent. The toxicity of propylene glycol ether to the human body is lower than that of ethylene glycol ether products, and it is a low-toxic ether. It has a faint ether smell, but no strong irritating smell. As an environmentally friendly organic solvent, it is more widely used and safe, and can be used in many fields. For example, styrene-acrylic emulsion, acrylic emulsion and its latex paint body, viscosity modifier in b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C07C43/13C07C41/03
CPCB01J31/06C07C41/03C07C43/13
Inventor 刘瑞霞安然时晓珍陈圣新张瑞锐周志茂
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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