VERFAHREN ZUR HERSTELLUNG VON TECHNISCHEN GEMISCHEN SULFIERTER 2-ALKYLIMIDAZOLINDERIVATE

• Main Authors: UPHUES, GUENTER, 4019 MONHEIM, DE, CLASEN, FRANK, 4010 HILDEN, DE, BEHLER, ANSGAR., 4250 BOTTROP, DE, PLOOG, UWE., 5657 HAAN, DE
• Format: Patent
• Language: German
• Published: 11.04.1991
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY

Technical mixtures of sulphated 2-alkylimidazoline derivatives of general formula (I), where R is a mixture of various straight-chain alkyl groups with a chain length of 5 to 17 carbon atoms and n is a number between 0 and 9, and their neutralization products with bases, can be prepared by sulphurization of technical mixtures of hydroxyethyl-2-alkylimidazoline derivatives of general formula (II), where R and n have the above-mentioned meanings, with sulphur trioxide. To this end, technical mixtures of the hydroxyethyl-2-alkylimidazoline derivatives, of which at least 40 wt. % are substituted with a 2-undecyl group, at least 15 wt- % with a 2-tridecyl group and not more than 33 wt. % with a 2-heptadecyl group and/or a straight-chain alkyl group with more than 17 carbon atoms, are reacted continuously in a thin layer with a mixture of gaseous sulphur trioxide and an inert carrier gas at temperatures between 70 and 120 DEG C in a molar ratio of sulphur trioxide to hydroxyethyl-2-alkylimidazoline derivates between 0.5:1 and 1.0:1; if necessary, the sulphurization products are neutralized with bases.