Preparation method of ionic liquid

Abstract

The invention relates to a preparation method of ionic liquid. The preparation method mainly includes following steps: (1), sequentially adding 20 mL of anhydrous alcohol and 0.1 mol of 1, 4-butane sultone into a 100-mL three-opening flask; (2), magnetically stirring at normal temperature; (3), using a constant-pressure liquid dropping funnel to dropwise add 2-methylpyridine in equal amount of substance, and slowly heating to 80 DEG C after dropwise adding is completed; (4), obtaining yellowish solid precipitate after 4 h, using anhydrous alcohol for repeated washing and suction filtering, and performing vacuum drying for 3 h at temperature below 100 DEG C to obtain an intermediate 2-methlypyridine butane sultone. The preparation method is simple, and a catalyst synthesized by the ionic liquid obtained is high in activity and suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of an ionic liquid. Background technique [0002] As a new type of environment-friendly solvent and liquid acid catalyst, ionic liquid has both the high density of reactive sites of liquid acid and the non-volatility of solid acid, wide liquid range, high stability, wide variety and structural adjustability . However, in practical applications, ionic liquids have disadvantages such as large amount of use, high cost, deactivation of catalytic active centers due to filtration of ionic liquids during recycling, and the need to use a large amount of extractant when extracting products from ionic liquids. In recent years, scholars have begun to explore the synthesis of supported ionic liquids and their applications in the fields of catalysis, separation, and polyelectrolytes. Ionic liquid loading is to immobilize or immobilize ionic liquid on a solid carrier by physical or chemical methods. Make the carrier s...