| Patent Number |
Title Of Patent |
Date Issued |
| 7345173 |
Work-up of the mother liquor obtained in the preparation of high-purity triethylenediamine |
March 18, 2008 |
| In a process for the purification of triethylenediamine (TEDA) in which TEDA is vaporized and the gaseous TEDA is passed into a liquid solvent and is subsequently crystallized from this, the mother liquor obtained after the TEDA has been crystallized is extracted with an extractant w |
| 7119231 |
Method for producing alkanolamines |
October 10, 2006 |
| At least one alkanolamine is prepared by reacting ammonia with alkylene oxide in a reaction space in the presence of a catalyst to give monoalkanolamine or dialkanolamine or trialkanolamine or a mixture of two or three of these compounds, the distribution of the various alkanolamines |
| 7115742 |
Process for the preparation of triethylenediamine (TEDA) from ethylenediamine |
October 3, 2006 |
| A process for the preparation of triethylenediamine (TEDA) by reaction of ethylenediamine (EDA) in the presence of a zeolite catalyst, wherein the zeolite catalyst contains one or more metals M in oxidation states II, III or IV as oxides. The desired molar ratio of SiO.sub.2 to metal oxi |
| 6958397 |
Method of selectively synthesizing triethylenediamine |
October 25, 2005 |
| The present invention describes a process for the preparation of triethylenediamine by reacting piperazine over a zeolite catalyst which, in addition to SiO.sub.2, contains an oxide of at least one further divalent, trivalent or tetravalent metal M, wherein the zeolite has a molar Si |
| 6576796 |
Process for the preparation of alkylamines |
June 10, 2003 |
| Preparation of alkylamines, where, in a first process stage, an olefin is reacted with ammonia, a primary amine and/or a secondary amine under hydroaminating conditions, and then, in a second process stage, the resulting hydroamination product(s) is/are reacted under transalkylating |
| 6562971 |
Process for the preparation of triethylenediamine (TEDA) |
May 13, 2003 |
| A process for the preparation of triethylenediamine (TEDA) by reaction of ethylenediamine (EDA) in the presence of a zeolite catalyst, wherein the zeolite catalyst comprises one or more metals M in oxidation states II, III or IV as oxides, and for M=Al, has an SiO.sub.2 /M.sub.2 O.sub. |
| 6552194 |
Process for the preparation of pure triethylenediamine (TEDA) |
April 22, 2003 |
| The invention relates to the preparation of pure triethylenediamine (TEDA) by evaporating TEDA from the mixture comprising a solvent or diluent, where the solvent or diluent has a boiling point at atmospheric pressure in the range from 175 to 250.degree. C., passing the vapor-form TEDA i |
| 6365740 |
Preparation of 2-methyl-4-amino-5-aminomethylpyrimidine |
April 2, 2002 |
| 2-Methyl-4-amino-5-aminomethylpyrimidine of the formula 1 ##STR1##is prepared by reacting 2-methyl-4-amino-5-alkoxymethylpyrimidine of the formula 2 ##STR2##where R=C.sub.1 -C.sub.6 -alkyl, with ammonia in the presence of a catalyst. |
