Low odor surfactant

Claim 2

A process for deodorizing a polyoxypropylene group terminated polyoxyalkylene polyether polyol composition by removing allyloxypropan-2-ol in sufficient amount to reduce the content to less than 200 ppm, said allyloxypropan-2-ol, along with other imperities, are removed by evacuation to 1.0 to 10 mm of mercury and adjusting the pressure to 2.0 to 70 mm of mercury by injecting nitrogen below the surface of the liquid polyol.

Claim 3

The process of claim 1 wherein said nitrogen is injected by means of a conduit extending beneath the surface of the liquid polyol.

Claim 4

The process of claim 2 wherein said conduit leads to a sparger through which said nitrogen enters into said liquid polyol.

Claim 5

The process of claim 3 wherein said sparging is through a continuous circular conduit.

Claim 6

The process of claim 1 wherein said nitrogen is injected through the drain of the treatment vessel.

Claim 7

The process of claim 1 wherein said polyoxyalkylene polyether polyol is a cogeneric mixture of conjugated polyoxyalkylene compounds containing in their structure oxyethylene groups, oxypropylene groups, and the nucleus of an active hydrogen-containing organic compound having about 1 to 18 aliphatic carbon atoms and about 1 to 6 hydrogen atoms.

Claim 8

The process of claim 1 wherein the temperature is from about 120° to 165° C.

Claim 9

The process of claim 6 wherein the oxyethylene groups are present in polyoxyethylene chains that are attached to the nucleus at the site of the reactive hydrogen atoms and the oxypropylene groups are attached to the oxyethylene groups at the end opposite the end of said oxyethylene groups which are attached to the nucleus.

Claim 10

The process of claim 6 wherein said polyoxyalkylene polyols are oxypropylene group capped polyols and the polyoxyalkylene polyol prior to capping is a polyoxypropylene polyoxyethylene block copolymer wherein oxypropylene groups are present in chains that are attached to the nucleus of the active hydrogen-containing organic compound at the site of the reactive hydrogen atoms, the oxyethylene groups being attached to the polyoxypropylene groups at the end opposite the end of said latter groups which are attached to the nucleus.

Claim 11

The process of claim 6 wherein said active hydrogen containing compound is trimethylolpropane.