Process for improved recovery of paraxylene

Details Process for improved recovery of paraxylene Process for improved recovery of paraxylene

1986-02-10

1987-06-02

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585805, 585828, C07C 712, C07C 1508

Patent

active

046706186

ABSTRACT:
An improved process for concentration, separation and formation of paraxylene of the type wherein a hydrocarbon feed such as reformate is subjected to solvent extraction, fractionation and then Parex adsorption to remove paraxylene. The adsorber raffinate is isomerized to produce more paraxylenes and then recycled to the adsorber to remove the newly formed paraxylenes from the isomerization. The improvement includes a step of removing a stream from the process, downstream of the isomerization and introducing this stream upstream of the solvent extraction so that the concentration of non-aromatic such as naphthenes and paraffins produced in the isomerization will be reduced.

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patent: 4139571 (1979-02-01), Riemh

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