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AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsWilhelm Johannisbauer, Michael Nitsche, Lutz Jeromin
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Aliphatic alcohols with up to 30 and especially with 6 to 18 carbon atoms are separated from a mixture of alkyl glycosides and alcohols which are unreacted during the production of these glycosides, by single or multi-stage distillation. The alcohols are distilled off by a drop film evaporator to impoverish the reaction mixture to residual alcohol contents of 5 wt % and under. The strip load of the drop film evaporator is set to at least 1.0 m.sup.3 /h m, especially at least 1.8 m.sup.3 /h m and preferably at least 3.0 m.sup.3 /h m. It is possible to reduce the alcohol content of the product to any value between 0.1 and 5 wt % at acceptable overall cost.
A process for reducing the aliphatic alcohol content of a mixture comprised of an alkyl polyglycoside and an aliphatic alcohol having up to about 30 carbon atoms comprising passing a mixture comprised of an alkyl polyglycoside and one or more aliphatic alcohols having up to about 30 carbon atoms through a falling film evaporator wherein the linear load in said evaporator is at least 1.0 m.sup.3 /h m.
A multi-stage process for reducing the aliphatic alcohol content of a mixture comprised of an alkyl polyglycoside and an aliphatic alcohol having up to about 30 carbon atoms comprising passing a mixture comprised of an alkyl polyglycoside and one or more aliphatic alcohols having up to about 30 carbon atoms through a first falling film evaporator and then passing the output of said first evaporator through one or more additional falling film evaporators arranged serially wherein the linear load in each of said evaporators is at least 1.0 m.sup.3 /h m.
Dependencies are inferred from the claim text.