Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1990-12-10
1992-09-22
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568750, 568752, C07C 3782, C07C 3770
Patent
active
051498871
ABSTRACT:
A process for the coextraction of para-cresol and meta-cresol from a feed mixture comprising p-cresol, o-cresol and m-cresol and one other alkyl phenol with an adsorbent comprising an X zeolite exchanged with barium ions or a mixture of barium and potassium ions at exchangeable sites to preferentially adsorb both para- and meta-cresol. The adsorbent must contain at least about 5 wt. % water (LOI method). The coextracted cresol isomers are thereafter removed from the adsorbent by contacting it with a desorbent material and recovering said coextracted cresols as a product stream. Para-cresol and meta-cresol can thereafter be recovered as purified individual isomers by a second state adsorptive separation using a second adsorbent selective for para-cresol, e.g., said first adsorbent dried to an LOI of less than about 4 wt. %, preferably about 2 wt. % water. In a preferred embodiment, the process uses a simulated moving-bed countercurrent flow system in both adsorption separation steps.
REFERENCES:
patent: 4124770 (1978-11-01), Miyakes et al.
patent: 4356331 (1982-10-01), Inoune
patent: 4386225 (1983-05-01), Neuzil
Hall Jack H.
Lone Werren B.
McBride Thomas K.
Spears Jr. John F.
UOP
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