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US 5,847,229 AGranted
Process for the production of end-capped nonionic surfactants
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsJoaquim Bigorra Llosas, Nuria Bonastre, Antonio Trius Oliva, Rafael Pi Subirana
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Abstract
Process for the production of end-capped nonionic surfactants by forming an alcoholate between a fatty alcohol polyglycol ether and a solid base, reacting the alcoholate with a dialkyl sulfate, adding water to initiate phase separation, and separating the organic layer from the aqueous layer.
Claims20
A process for the production of end-capped nonionic surfactants corresponding to formula (I):
- ##STR3## in which R.sup.1 is an alkyl or alkenyl group containing 6 to 22 carbon atoms, n1 and n2 independently of one another are 0 or a number of from 1 to 10, and m is a number of from 1 to 20, comprising the steps of
- A) reacting at least one fatty alcohol polyglycol ether corresponding to formula (II):
- ##STR4## in which R.sup.1, n1, n2 and m are as defined above, with a solid base (III), having a water content of less than 15% by weight, in the presence of an alkali metal borohydride, an alkaline earth metal borohydride, or both;
- B) etherifying the resulting alcoholate or alcoholates with dimethyl sulfate,
- C) adding water to the etherified alcoholate or alcoholates in an amount sufficient to result in phase separation into an organic phase and an aqueous phase;
- and
- D) separating the organic phase from the aqueous phase.
4 more elements
Dependencies are inferred from the claim text.