Purification and decolorization of off-color alkyl alkanolamines
AssigneeElf Atochem North America, Inc.
InventorsThomas H. Overgaard, Louis P. Verduce
Life of this patent
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Abstract
Off-color N-(C.sub.4 -C.sub.10)alkyl di(C.sub.2 -C.sub.3) alkanolamines purified and decolorized by vacuum distillation at a pressure within the range of 1 to 50 mm.Hg (1-50 torr) in the presence of water and or water-soluble metal borohydride whereby the distilled alkanolamine has a reduced APHA color rating which is maintained on storage.
Claims14
A process for the preparation of high purity, low APHA color product from a crude N-(C.sub.4 -C.sub.10)alkyl di (C.sub.2 -C.sub.3)alkanolamine containing contaminants including color-forming bodies which comprises vacuum distilling said alkanolamine at a pressure of less than about 50 mm. Hg in the presence of water and a water-soluble metal borohydride whereby the distilled alkanolamine has a reduced APHA color rating which is maintained on storage.
Dependencies are inferred from the claim text.