Method for preparing maleate by catalyzing maleic anhydride with ionic liquid
A technology of maleic anhydride and ionic liquid, which is applied in the field of ionic liquid catalyzing maleic anhydride to prepare maleic acid ester, can solve the problems of difficult complete regeneration, equipment corrosion, and many side reactions, and achieves the effect of solving equipment corrosion.
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[0025] Example 1:
[0026] 1-Propylsulfonic acid-3-methylimidazole bisulfate ionic liquid catalyzed by the reaction of maleic anhydride and methanol to prepare dimethyl maleate
[0027] Preparation of 1-propylsulfonic acid-3-methylimidazole hydrogen sulfate ionic liquid:
[0028] Add 4.106g (0.05moL) of methylimidazole and ethanol (50mL) into a 150mL three-necked flask, put it in an oil bath at 70°C, preheat it, and add 1,3-propyl sulfonic acid dropwise under magnetic stirring. 6.107g (0.05mol) of the ester was added to the flask, and after dripping, the stirring was continued for 8h to obtain the intermediate product, namely, 1-propylsulfonic acid-3-methylimidazole with cationic sulfonic acid function. After the reaction is completed, the intermediate product is rinsed with ether 3 to 5 times to remove unreacted raw materials, and then placed in a vacuum drying oven and dried at 80°C for 12 hours.
[0029] Add the intermediate product to a 150mL round bottom flask, dissolve it with ...
Example Embodiment
[0031] Example 2:
[0032] N-Butylsulfonic acid pyridine hydrogen sulfate ionic liquid catalyzed the reaction of maleic anhydride and methanol to prepare dimethyl maleate
[0033] Preparation of N-Butylsulfonic Acid Pyridine Hydrogen Sulfate Ionic Liquid:
[0034] Add 3.933g (0.05mol) of pyridine and ethanol (50mL) into a 150mL three-necked flask, put it in an oil bath at 70°C, and then drop 6.8085g (0.05mol) of butyl sultone under magnetic stirring. ) Was added to the flask, and after the dripping was finished, the stirring was continued for 8 hours to obtain the intermediate product, namely, N-butylsulfonic acid pyridine with cationic sulfonic acid function. After the reaction is completed, the intermediate product is rinsed with ether 3 to 5 times to remove unreacted raw materials, and then placed in a vacuum drying oven and dried at 80°C for 12 hours.
[0035] Add the intermediate product to a 150mL round bottom flask, dissolve it with an appropriate amount of deionized water, pr...
Example Embodiment
[0037] Example 3:
[0038] 1-Propylsulfonic acid-3-methylimidazole hydrogensulfate ionic liquid catalyzed by the reaction of maleic anhydride and ethanol to prepare diethyl maleate
[0039] Preparation of 1-propylsulfonic acid-3-methylimidazole hydrogen sulfate ionic liquid: The process is the same as in Example 1.
[0040] Esterification of maleic anhydride: Weigh 0.9806g (0.01mol) of maleic anhydride, 2.7642g (0.06mol) of ethanol, and 0.0605g (0.2mmol) of 1-propylsulfonic acid-3-methylimidazole hydrogen sulfate ionic liquid. ) In a glass microwave tube, set the reaction temperature to 120°C, and react for 1 hour, the conversion of maleic anhydride reaches 97.87%, and the yield of diethyl maleate reaches 88.39%.
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