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【答案】应助回帖
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s090604054(金币+100, 翻译EPI+1): ★★★很有帮助 2012-01-28 21:20:18
爱与雨下(金币+2): 2012-01-29 16:20:17
Acidic ionic liquid, as a new environmental-friendly liquid catalyst, are drawing attention from catalyst field and petrochemical industry over the world. It has unique advantages over traditional catalysts. First it has high-density reaction position of liquid acidic catalyst and low volatility. Second its acidity is over solid super-strong acid and can be adjusted according to the need. Then it can have both B acidity and L acidity and catalyst can be separated from products so it can be used repeatedly. Moreover, it has wide liquid range, low melting point, good heat-solidity, and good product selectivity (which are called as liquid molecular sieve). It is designable so that after molecular design of ionic liquid, anions and cations could be combined and proper groups could be added via introducing acidic groups in ionic liquid to get acidic ionic liquid with specific needs or proper needs. These features make acidic ions have functions and features of liquid and solid acid. Therefore, combining structure variety of ionic liquid and features can build large amount of ionic liquid acidic catalyst with different properties and usages. Meanwhile, high catalyst activity of ionic liquid can make efficiency and product ratio higher and ionic liquid can be recycled to use, which can reduce total cost and avoid environment pollution compared to solid acid catalyst to get clean production. In addition, with further development of low-cost ionic liquid and establishment of mass production of ionic liquid, the price of ionic liquid can decrease continuously. So ionic liquid replacing industrial catalyst has great potential and is being widely used in various reaction process such as alkylation, acylation, polymer (?), esterification, condensation, etherification, ester exchange.
中间有一部分术语不太专业，仅供参考。 |
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