Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1995-04-26
1997-04-15
Wu, Shean C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568699, C07C 4134
Patent
active
056211503
ABSTRACT:
The present invention relates to a cyclic process for the preparation of ethyl tert.-alkyl ethers by the reaction of an alcohol, such as ethanol, with an iso-olefin such as isobutylene or isoamylene wherein an effluent from the reaction zone is first separated in a distillation column to provide an overhead effluent stream and a bottoms effluent stream comprising ethyl tert.-alkyl ether and unreacted ethanol, and the ether product is passed to an adsorption zone to remove the unreacted ethanol. When the reaction occurs in the presence of water, a tert. alcohol (e.g., TBA or TAA) is produced and, if returned to the reaction zone, the tertiary alcohol builds up in the process and reduces efficiency. An adsorbent selected from the group consisting of zeolite 13X, silica-bonded silicalite, an alkali-exchanged zeolite with an MFI structure having a silica/alumina ratio greater than 20 and mixtures thereof is employed in an adsorption zone to remove the unreacted ethanol from the ether product to provide ether product essentially free of ethanol and comprising the tertiary alcohol. Thus, the tertiary alcohol is removed with the ether product as a high octane, oxygenate blending component for reformulated gasoline with a low vapor pressure. The invention is useful in recovering unreacted ethanol from the other product stream and returning the unreacted ethanol to the reaction zone without returning TBA. The invention prevents the build-up of tertiary alcohol in the unreacted ethanol stream which adversely affects the operation of the reaction zone and reduces catalyst stability.
REFERENCES:
patent: 3726942 (1973-04-01), Louder
patent: 4219678 (1980-08-01), Obenaus et al.
patent: 4447653 (1984-05-01), Vora
patent: 4575567 (1986-03-01), Vora
patent: 4605787 (1986-08-01), Chu et al.
patent: 4857669 (1989-08-01), Huang et al.
patent: 4876394 (1989-10-01), Nagji et al.
patent: 5015783 (1991-05-01), Vora et al.
patent: 5329051 (1994-07-01), Eason et al.
patent: 5401887 (1995-03-01), Rastelli et al.
patent: 5475150 (1995-12-01), Rastelli et al.
Frey Stanley J.
Rastelli Henry
Yon Carmen M.
McBride Thomas K.
Silverman Richard P.
Tolomei John G.
UOP
Wu Shean C.
LandOfFree
Process for the production of ethyl tert.-alkyl ethers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of ethyl tert.-alkyl ethers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of ethyl tert.-alkyl ethers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-362217