Preparation of mono- and poly-ethylene glycol dialkyl ethers

US4187384A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Platz
• Werner Fuchs · Herrsching am Ammersee, DE
• Wolfgang Vodrazka · Freinsheim, DE

Key dates

• Filing date: Jan 10, 1979
• Grant date: Feb 5, 1980
• Expiry date: Jan 10, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/337
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Mono- and poly-ethylene glycol dialkyl ethers I EQU R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --R.sup.2 where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, R.sup.2 is C.sub.3 -C.sub.5 -alkyl and n is from 1 to 100, are prepared by reacting monoalkyl ethers II EQU R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --H with a C.sub.3 -C.sub.5 -olefin III in the presence of an acid ion exchanger at from 1 to 200 bar and from 40.degree. to 150.degree. C., the reaction being started at from 100.degree. to 150.degree. C. and the temperature then being lowered, in at least two approximately equal steps, to from 40.degree. to 80.degree. C., the temperature being dropped in each case to the next-lower level when the conversion per unit time no longer changes significantly.