Process for preparing alkyl tert-butyl ethers and di-n-butene fr

Details Process for preparing alkyl tert-butyl ethers and di-n-butene fr Process for preparing alkyl tert-butyl ethers and di-n-butene fr

1997-07-24

1999-01-26

Geist, Gary

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568454, 585809, C07C 4106

Patent

active

058640525

ABSTRACT:
The invention relates to a process for preparing di-n-butene and alkyl tertbutyl ethers in a coupled production from field butanes, which indicates (a) separating the field butanes 1 into n-butane and isobutane in the separation stage 4, (b) dehydrogenating the n-butane 5 in a dehydrogenation stage 6 to give an n-butene-containing dehydrogenation mixture 7, oligomerizing the n-butene in the oligomerization stage 10 to give an oligomer mixture 11 and separating di-n-butene 12 off from this, and (c) de-hydrogenating the isobutane 15 in the dehydrogenation stage 16 to give an isobutene-containing dehydrogenation mixture 17 and reacting the isobutene with an alkanol 20 in the etherification stage 19 to give an alkyl tert-butyl ether 21. In an advantageous embodiment, the field butanes 1, prior to entry into the separation stage 4, are subjected to hydrogenation conditions in the hydrogenation stage 2 and an isomerization stage 3 is assigned to the separation stage 4, by means of which isomerization stage the ratio of n-butane to isobutane is set in accordance with the desired ratio of alkyl tertbutyl ether to di-n-butene.

REFERENCES:
S.T. Bakas et al, "Production of Ethers From Field Butanes and Refinery Streams", Aug. 19-22, 1990, pp. 1-32.
K.H. Walter et al, "The Huels Process for Selective Hydrogentation of Butadiene in Crude C.sub.4 's Development and Technical Application", Nov. 11-12, 1993.
R.A. Pogliano et al, "Dehydrogenation-Based Ether Production Adding Value to LPG and Gas Condensate", Mar. 19-21, 1996.
Chauvin A. Hennico et al, "Upgrading of C.sub.2, C.sub.3, C.sub.4 Olefins by IFP Dimersol Technology", Jul./Aug. 1990, pp. 309-315.
G.C. Sturtevant et al, "Selective Production of Light Olefins", 1988 UOP Technology Conference.
Dr. F. Nierlich, "Recent Developments in Olefin Processing for Cleaner Gasoline", Published in Oil Gas Magazine, 1992.
Dr. Nierlich, "Oligomerize for better gasoline", Published in: Hydocarbon Processing, Feb. 1992.
R.L. Espinoza et al, "Catalytic Oligomerization of Ethene Over Nickel-Exchanged Amorphous Silica-Alumina; Effect of The Nickel Concentration", Applied Catalysis, 31 (1987), Elsevier Science Publishers B.V., Amsterdam, pp. 259-266.
W. Grote, "Introducing: Alkar and Butamer", Universal Oil Products Co., Mar. 31, 1958, pp. 73-76.

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