Process for making p-xylene with a purity of at least 99.5%

Details Process for making p-xylene with a purity of at least 99.5% Process for making p-xylene with a purity of at least 99.5%

1989-04-14

1990-08-28

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By cooling of liquid to obtain solid, e.g., crystallization,...

585817, 62533, 62534, B01D 904

Patent

active

049527509

ABSTRACT:
This process is an improvement of a process described in German Open Patent Application No. 3703646 for obtaining a p-xylene product with a purity of at least 99.5%. The inert fluid used as a cold carrier is mixed with a crude product starting material, which has a high p-xylene content, in a mixing vessel under rotation to form a resultant mixture. Subsequently the resultant mixture is concentrated to a crystal content of from 30% to 70% and after that the p-xylene crystals are separated in a separator. The purity of the product p-xylene can be increased by heating these crystals in the separator.

REFERENCES:
patent: 3410923 (1968-11-01), Strand et al.
patent: 3435625 (1969-04-01), Wiegandt
patent: 3467724 (1969-09-01), Laurich
patent: 3501493 (1970-03-01), Oldenburg
patent: 3541804 (1970-11-01), Wiegandt et al.
patent: 3643453 (1972-02-01), Groothuis et al.
patent: 3903795 (1976-06-01), Wood et al.

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