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Grzesik M.,Instytut Inzynierii Chemicznej PAN | Ptaszek A.,University Rolniczy | Skrzypek J.,University Rolniczy | Derewinski M.,Instytut Katalizy i Fizykochemii Powierzchni PAN
Przemysl Chemiczny

H form of H-ZSM-5 zeolite was prepd. and used for MeOH dehydration to Me 2O at 403-483 K. Parameters of the Langmuir-Hinshelwood kinetic equation of the reaction were detd. The effect of water on the catalyst activity and Me 2O yield was negligible. Source

Cr and/or Ce were added as dopants to Cu-Zn-Zr and Cu-Zn-Zr-Ga oxide catalysts used for steam reforming of MeOH. The Cr and Cr-Cu-doped catalysts showed an increasing activity even at low temp. (433-473 K). Source

Phthalic anhydride was esterifled with n-heptyl, n-nonyl and n-undecyl aics. in presence of H 2SO 2 H 3PW 12O 40·XH 2O or TiBu 4 cataiysts (0.05-0.25% by mass) at 413 K to 453 K to det. the reaction Idnetics. The 1 st order reaction (except for TiBu 4) was found. The TiBu 4 showed the iowest cataiytic activity but the highest activation energy (149,2 kJ/mole). Source

Expt. data on CO 2 absorption In aq. solns. of NH 2CH 2CH 2OH and NH(CH 2CH 2OH) 2 In wetted-wall and packed columns (K. Warmuziński, J. Buzek and J. Podkański, 1995) were used for quant. anal. of the cellular comection effects. The effects resulted in an enhancement of the absorption rate. A method for estimation of the effects was deweloped. Source

Ca oxalate was pptd. from aq. solns. of CaCI 2and Na oxalate by micromixing of the reactant streams in the two-perpendicular-jets distributor. The strems continuously collided with each other at 23.5°C, pH 6.5 and ionic strength of solns. 0.2 mol/L Velocity of the streams were 2.78-11.11 m/s and reagent concns. 0.003-0.05 mol/L. Both immersed and unimmersed configurations of distributors with varying widths of nozzles (0.5 and 1 mm) and horizontal inter-nozzle distances (0, 1.3 and 1.8 mm) were used. The size distributions and hydratation degree of crystals were analyzed. The monodisperse microcrystals of desired form (Ca oxalate dihydrate) and size (1-10 μm) rea̧uired for inhalation delivery systems were produced. Source

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