Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1992-07-02
1993-11-09
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C07C 4106
Patent
active
052604934
ABSTRACT:
A continuous process for converting lower aliphatic alkanol and light olefinic hydrocarbon feedstock rich in tertiary olefins, such as isobutylene and other C.sub.4 isomeric hydrocarbons, to alkyl tertiary-alkyl ethers and C.sub.5 + gasoline boiling range hydrocarbons. An improved process and reactor system includes means for: washing the olefinic hydrocarbon feedstock with an aqueous liquid stream in a contactor unit to recover water-soluble impurities therefrom in a washwater stream recovered from the contactor unit; contacting the lower aliphatic alkanol and a washed light olefinic hydrocarbon stream from the contactor unit under iso-olefin etherification conditions in at least one etherification reaction zone containing acid etherification catalyst; separating etherification effluent to recover a light primary effluent stream comprising unreacted alkanol and light olefinic hydrocarbon and a liquid product stream containing alkyl tertiary-butyl ether; contacting at least one effluent stream containing unreacted alkanol and light olefinic hydrocarbon with a substantially fresh water liquid extractant stream to recover unreacted alkanol therein. In a preferred embodiment, at least a portion of the alkanol-containing liquid extract stream is passed to the washing step for treatment of hydrocarbon feedstock.
REFERENCES:
patent: 4544776 (1985-10-01), Osterburg et al.
patent: 4665237 (1987-05-01), Arakawa et al.
patent: 4827046 (1989-05-01), Harandi et al.
patent: 4831195 (1989-05-01), Harandi et al.
Harandi Mohsen N.
Owen Hartley
Mars Howard T.
McKillop Alexander J.
Mobil Oil Corporation
Wise L. G.
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