Tripropylene

Abstract: AN AQUEOUS ALKALINE STRIPPING SOLUTION WHICH CONTAINS AN ACCELERATOR COMPOSITION COMPRISES OF AN ALKYLENE GLYCOL ARYL ETHER, TRIPROPYLENE GLYCO OR DIPROPYLENE GLYCOL, AND AN ORGANIC NITROGEN COMPOUND OF THE FORMULA: R1-N(-R2)-R3 WHEREIN R1, R2 AND R3 ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKANOL AND HYDROXY ETHER GROUPS WHEREIN THE HYDROXY GROUPS IS TERMINAL, WHICH LATTER GROUPS CONTAIN FROM ABOUT 2 TO 10 CARBON ATOMS, AT LEAST 1 OR R1, R2 AND R3 BEING OTHER THAN HYDROGEN, THE COMPOUND HAVING A BOILING POINT OF AT LEAST ABOUT 100 DEGREES C. AND A MOLECULAR WEIGHT WHICH IS NOT SUBSTANTIALLY IN EXCESS OF ABOUT 500. THE PREFERRED COMPONENTS OF THE ACTIVATOR COMPOSITION ARE ETHYLENE GLYCOL MONOPHENYL ETHER, TRIPROPYLENE GLYCOL AND TRIETHANOLAMINE.

Abstract: The complex permittivity spectra of tripropylene glycol and water solutions have been obtained by time domain reflectometry (TDR) technique in the frequency range from 10 MHz to 30 GHz and the temperature range 20°C–05°C. The dielectric relaxation parameters such as static dielectric constant and relaxation time were obtained by using the non-linear least square fit method. The intermolecular hydrogen bonding of tripropylene glycol–water has been discussed using the Kirkwood correlation factor and thermodynamic parameters. The activation energy decreases with increase in water content in the mixture as expected in the Arrhenius behaviour. The dielectric constant for mixtures has been fitted to the Bruggeman mixture formula in the non-linear case.

Abstract: Prepn. of dipropylene triamine and tripropylene tetramine comprises condensing 1,2- or pref. 1,3-propylene diamine at 50-250 degrees C, pref. in presence of H2 and opt. with addn. of NH3. A Gp. VIII metal-contg. catalyst is used, including noble metals, and NH3 is produced during reaction. Higher polycondensates are decomposed to the dimers and trimers. At 25-200 bars H2 pressure and 160-200 degrees C conversions of ca 60% and sometimes ca 100% are obtd. for reaction times of 1-4 hrs. Good specificity for the dimer can be obtd. Prods. can be sepd. easily by distillation; very little prodn. of cyclic, branched or partially deaminated prods. occurs.

Abstract: Disclosed is an apparatus and process for producing a tripropylene glycol in which alkylene oxide, water, an acid catalyst and a dipropylene glycol are contacted together under conditions suitable to form the tripropylene glycol. Water is present in the reaction mixture in the range of 1 to 50 weight percent of the reaction mixture. The ratio of water to alkylene oxide is less than 9. The tripropylene glycol thus produced exhibits a higher primary hydroxyl group content advantageously exceeding 36 percent. Such tripropylene glycols find utility in the production of acrylics. Also disclosed is a process for making esters from such glycols.