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1. MYPI 96005372 - PROCESS FOR PREPARING ALKYL ETHERS AND MIXTURES THEREOF

Office Malaysia
Application Number PI 96005372
Application Date 19.12.1996
Publication Number PI 96005372
Publication Date 22.06.1997
Publication Kind A
IPC
C07C 43/04
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
43Ethers; Compounds having groups, groups or groups
02Ethers
03having all ether-oxygen atoms bound to acyclic carbon atoms
04Saturated ethers
C07C 41/06
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
41Preparation of ethers; Preparation of compounds having groups, groups or groups
01Preparation of ethers
05by addition of compounds to unsaturated compounds
06by addition of organic compounds only
C07C 41/42
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
41Preparation of ethers; Preparation of compounds having groups, groups or groups
01Preparation of ethers
34Separation; Purification; Stabilisation; Use of additives
40by change of physical state, e.g. by crystallisation
42by distillation
Applicants NESTE OY
Inventors ESA TAMMINEN
PETRI LINDQVIST
Agents HARIRAM JAYARAM
Priority Data 956256 22.12.1995 FI
Title
(EN) PROCESS FOR PREPARING ALKYL ETHERS AND MIXTURES THEREOF
Abstract
(EN)
THE INVENTION RELATES TO A PROCESS FOR PREPARING TERTIARY ALKYL ETHERS, IN PARTICULAR MTBE, ETBE OR MIXTURES OF THESE ETHERS WITH HEAVIER ETHERS. ACCORDING TO THE PROCESS THE FEEDSTOCK CONTAINING HYDROCARBONS IS FED TO A CATALYTIC DISTILLATION REACTOR SYSTEM, IN WHICH THE ISOOLEFINS, IN PARTICULAR THE C4 TO C7 ISOOLEFINES, OF THE FEED ARE REACTED WITH AN ALKANOL IN THE PRESENCE OF A CATION EXCHANGE RESIN IN ORDER TO PRODUCE TERTIARY ALKYL ETHER PRODUCTS. THE REACTION PRODUCT CONTAINING THE ETHERS IS REMOVED FROM THE DISTILLATION SYSTEM AS THE BOTTOMS PRODUCTS AND, IF NECESSARY, IT IS SUBJECTED TO AN ADDITIONAL TREATMENT FOR PRODUCING A GASOLINE COMPONENT. THE UNREACTED ALKANOL IS REMOVED AS THE OVERHEAD PRODUCT OF THE DISTILLATION. ACCORDING TO THE INVENTION, THE DISTILLATE WITHDRAWN MAINLY CONTAINS AN AZEOTROPE OF C3 HYDROCARBONS AND ALKANOL, THE C3 AMOUNT OF WHICH AT LEAST APPROXIMATELY CORRESPONDS TO THE C3 HYDROCARBON CONCENTRATION OF THE HYDROCARBON FEED, A SUBSTANTIAL AMOUNT OF THE UNREACTED ALKANOL BEING REMOVED IN THE FORM OF SAID AZEOTROPE. BY MEANS OF THE INVENTION THE NEED FOR A SEPARATE ALKANOL WASHING UNIT IS ELIMINATED IN THE APPARATUS WHICH CONSIDERABLY REDUCES APPARATUS INVESTMENT COSTS.(FIG. 1)