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1. US6369280 - Process for preparing alkyl ethers and mixtures thereof

Office United States of America
Application Number 09640893
Application Date 17.08.2000
Publication Number 6369280
Publication Date 09.04.2002
Grant Number 6369280
Grant Date 09.04.2002
Publication Kind B1
IPC
C07C 41/00
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
41Preparation of ethers; Preparation of compounds having groups, groups or groups
B01D 3/00
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
3Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
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
C07C 43/00
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
43Ethers; Compounds having groups, groups or groups
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
CPC
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
B01D 3/009
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
3Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
009in combination with chemical reactions
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
C10L 1/023
CCHEMISTRY; METALLURGY
10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
LFUELS NOT OTHERWISE PROVIDED FOR
1Liquid carbonaceous fuels
02essentially based on components consisting of carbon, hydrogen, and oxygen only
023for spark ignition
Y02P 20/127
Applicants Neste Oy
Inventors Tamminen, Esa
Lindqvist, Petri
Agents Birch Stewart Kolasch & Birch, LLP.
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 isoolefines, in particular the C4to C7isoolefines, 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 product 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 C3hydrocarbons and alkanol, the C3amount of which at least approximately corresponds to the C3hydrocarbon 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.