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US 8,394,992 B2Granted
Synthesis of triethylenetetramines
AssigneePhilera New Zealand Limited
InventorsMarco Jonas, Irene Vaulont, Antonio Soi, Gunther Schmidt
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Abstract
Methods and intermediates for synthesizing triethylenetetramine and salts thereof, as well as novel triethylenetetramine salts and their crystal structure, and triethylenetetramine salts of high purity.
Claims17
A process for preparing triethylenetetramine dihydrochloride, comprising:
- (a) reacting triethylenetetramine tetrahydrochloride with a base in a solvent to produce triethylenetetramine and chloride salt;
- (b) removing said chloride salt from solution;
- (c) reacting said triethylenetetramine with about 2 equivalents of concentrated hydrochloric acid to form triethylenetetramine dihydrochloride;
- and (d) adding an alcohol to the solution and precipitating said triethylenetetramine dihydrochloride.
1 more element
Dependencies are inferred from the claim text.