Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By condensation of entire molecules or entire hydrocarbyl...
Patent
1992-08-05
1998-05-26
Achutamurthy, Ponnathapura
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By condensation of entire molecules or entire hydrocarbyl...
585323, 585446, C07C 268
Patent
active
057568731
ABSTRACT:
A method is provided for simply and effectively increasing monoalkylation of aromatic compounds while also increasing the life of the acid catalyst used to alkylate said compounds. The method and apparatus involve drastically reducing the amount of the alkylation agent present in the reaction mixture, e.g., to at least about a 99:1 excess of aromatic, preferably to about a 999:1 excess of aromatic. In a preferred embodiment, the alkylation agent is introduced intermittently, or in stages, at a ratio of at least 999:1 so that the excess of aromatic may be maintained at all points in the reactor in order to most effectively prolong the life of the catalyst. For continuous operation, a single reactor equipped with multiple injection ports may be used, or multiple reactors may be connected in series adapted so that the alkylation agent may be introduced prior to each reactor.
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Achutamurthy Ponnathapura
Exxon Chemical Patents Inc.
Sherer Edward F.
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