Alkylation process with reduced heavy residue

Details Alkylation process with reduced heavy residue Alkylation process with reduced heavy residue

1998-07-31

2000-10-24

Wood, Elizabeth D.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By condensation of entire molecules or entire hydrocarbyl...

585453, 585455, 585457, 585467, 585470, 585474, 585475, C07C 15067

Patent

active

061370207

ABSTRACT:
A process for reducing the amount of undesirable byproducts, for example multi-ring compounds known as heavy residue in a process for the alkylation of an aromatic hydrocarbon with an olefin using a silicalite catalyst is disclosed. The process comprises supplying a feedstock containing benzene to a reaction zone with an alkylating agent in a molar ratio of benzene to alkylating agent of from about 2:1 to about 20:1 and into contact with an aluminosilicate alkylation catalyst having an average crystallite size of less than about 0.50 .mu.m and wherein the size of about 90% of the crystallites is less than 0.70 .mu.m. The catalyst is characterized by an Si/Al atomic ratio in the range from between 50 and 150 and a maximum pore size in the range from about 1000 to 1800 .ANG.. The catalyst has a sodium content of less than about 50 ppm and the reaction is carried out under conversion conditions including a temperature of from about 250.degree. C. to about 550.degree. C. and a pressure of from about 200 psi to about 500 psi.

REFERENCES:
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patent: 4490570 (1984-12-01), Forward et al.
patent: 4520220 (1985-05-01), Watson et al.
patent: 4599473 (1986-07-01), Debras et al.
patent: 5177280 (1993-01-01), Juguin et al.
patent: 5248841 (1993-09-01), Young
patent: 5847255 (1998-12-01), Ghosh et al.

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