Cresex process

Cresex process, l 676t Cresol epoxy novolacs, 10 369 Cresol novolacs, 10 406 Cresols, from propylene, 20 786-787 m-Cresol, 20 268. See also 3-Methylphenol antimicrobial used in cosmetics, 7 831t o-Cresol. See also 2-Methylphenol... 

Only one commercial plant based on UOP s proprietary Cresex Process is operated by Merichem (Now Merisol) at Houston, TX, USA. Cresex is an extension of UOP s well-known Sorbex process based on adsorption and desorption. 

Cresex process for separation of pure para-cresol and meto-cresol from a mixture of m-p-cresols. 

Needless to emphasize that UOP s Cresex process—an adaptation and extension of its generalized Sorbex processes—provides a unique opportunity for separation of m-p-cresols into pure p-cresol (99%) and pure m-cresol (99%). Quite surprisingly UOP has till now licensed cresex technology... 

Recently Chiyoda Corporation, Japan, has announced that the company through a licensing agreement with Kellog is in a position to offer a suitable technology for separation of meta and para-cresol from an isomeric mixture of cresols. Though not much is known about Chiyoda s process, it is learnt that the same is not very different from UOP s Cresex process. 

Displacement-purge forms the basis for most simulated continuous countercurrent systems (see hereafter) such as the UOP Sorbex processes. UOP has licensed close to one hundred Sorbex units for its family of processes Parex to separate p-xylene from C3 aromatics, Molex tor /i-paraffin from branched and cyclic hydrocarbons, Olex for olefins from paraffin, Sarex for fruc tose from dextrose plus polysaccharides, Cymex forp- or m-cymene from cymene isomers, and Cresex for p- or m-cresol from cresol isomers. Toray Industries Aromax process is another for the production of p-xylene [Otani, Chem. Eng., 80(9), 106-107, (1973)]. Illinois Water Treatment [Making Wave.s in Liquid Processing, Illinois Water Treatment Company, IWT Adsep System, Rockford, IL, 6(1), (1984)] and Mitsubishi [Ishikawa, Tanabe, and Usui, U.S. Patent 4,182,633 (1980)] have also commercialized displacement-purge processes for the separation of fructose from dextrose. 

Cresex [Cresol extraction] One of the Sorbex processes. This one extracts p- or m-cresol from mixed cresols, and ciesols as a class from higher alkyl phenols. By 1990, one plant had been licensed. 

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