Quaternary oxalkylated polycondensates
AssigneeHoechst Aktiengesellschaft
InventorsManfred Hofinger, Willibald Bose, Martin Hille, Roland Bohm
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Abstract
Quaternary oxalkylated polycondensates are described; these are prepared by esterifying, with polycondensation, an oxalkylated primary fatty amine with a diol and with a dicarboxylic acid, and oxalkylating the resulting reaction product in the presence of a carboxylic acid. These polycondensates are used as demulsifiers for breaking crude oil emulsion and as corrosion inhibitors in plants for the recovery and treatment of natural gas and crude oil.
Claims7
A quaternary oxalkylated polycondensate of the formula ##STR5## in which R.sup.1 is an alkyl radical or alkenyl radical having 8 to 23 carbon atoms,
- R.sup.2 is H or CH.sub.3 and, arranged in blocks within the chain of the polyoxalkylene radical, can also assume both meanings,
- R.sup.3 denotes an alkylene radical of formula --(CH.sub.2).sub.x -- in which x is an integer from 1 to 6 or denotes a polyoxalkylene radical of the formula ##STR6## in which R.sup.4 is H or CH.sub.3 and, arranged statistically or in blocks within the chain, can also assume both meanings, and c is an integer or fractional number from 2 to 80,
- R.sup.5 is an alkylene radical of the formula --(CH.sub.2).sub.y -- in which y denotes an integer from 1 to 8, it being possible for this alkylene radical optionally to carry 1 to 2 OH groups, or R.sup.5 is a vinylene radical or a p-phenylene radical,
- R.sup.6 is H or CH.sub.3,
- A.sup.- denotes the anion of a carboxylic acid having 2 to 6 carbon atoms or of a hydroxycarboxylic acid having 2 to 6 carbon atoms and 1 to 3 OH groups or denotes the anion of benzoic acid, salicylic acid or phosphoric acid,
- a and b are identical or different and are an integer or fractional number from 1 to 15,
- d is an integer or fractional number from 1 to 2 and
- n is an integer of from 2 to 50.
Dependencies are inferred from the claim text.