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US 4,731,165 AGranted
Method of decoloration of triethylenetetramine using sulfonic acid ion exchange resins
AssigneeThe Dow Chemical Company
InventorsDennis L. Niebruegge, Timothy J. Dempsey, S. Bennett Willis
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Abstract
A process of decoloring crude triethylenetetramine (TETA) is disclosed. In the disclosed and preferred procedure, a sulfonic acid ion exchange resin acts on the crude TETA to enable subsequent distillation at elevated temperature to obtain decolored TETA.
Claims14
A method of reducing triethylenetetramine (TETA) coloration comprising the steps of:
- (a) heating TETA to selected pressures and temperatures;
- (b) conducting the heating step in the presence of an ion exchange resin having a sulfonic acid functional group wherein the resin remains stable at the temperatures of the heating step;
- and
- (c) after a period of heating the TETA in the presence of the resin, then distilling the TETA to recover TETA with reduced coloration.
1 more element
A method of reducing polyalkylene polyamine (PAPA) coloration comprising the steps of:
- (a) heating PAPA to selected pressures and temperatures;
- (b) conducting the heating step in the presence of an ion exchange resin having a sulfonic acid functional group wherein the resin remains stable at the temperatures of the heating step;
- and
- (c) after a period of heating the PAPA in the presence of the resin, then distilling the PAPA to recover PAPA with reduced coloration.
1 more element
Dependencies are inferred from the claim text.