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Synteza wyższych alkoholi alifatycznych. Zagadnienia doboru katalizatora

Skrzypek J., Krupa K., Lachowska M., Moroz H.

Inżynieria Chemiczna i Procesowa

2000

T. 21, z. 4

715-724

Przedstawiono wyniki badań syntezy metanolu i wyższych alkoholi alifatycznych z gazu syntezowego przeprowadzonych w laboratoryjnym reaktorze ciśnieniowym. Stwierdzono, że odpowiednio modyfikowane katalizatory miedziowo-cynkowo-glinowe otrzymywane metodą współstrącania wykazują dobra aktywność i selektywność. Zbadano wpływ dodatku potasu, żelaza, molibdenu i toru na pracę katalizatorów.

The results of investigations of the synthesis of methanol and higher aliphatic alcohols from synthesis gas are presented. The experiments were carried out in a high-pressure fixed-bed microreactor. The CuO-ZnO-A12O3 catalyst promoted with a varying amount of K, Fe, Mo and Th prepared by the cop-recitation showed a good activity and selectivity. The influence of additives on activity and selectivity was investigated.

Selective hydrogenation of acetylene in an ethylene stream in an adiabatic packed bed reactor

Westerterp K.R., Bos A.N.R., Wijngaarden R.J., Kusters W.C., Martens A.

Inżynieria Chemiczna i Procesowa

2000

T. 21, z. 1

7-28

In earlier studies, the behavior of single catalyst pellets of palladium on alumina was investigated for the reaction of acetylene in an ethylene stream with hydrogen. Particle runaway, temperature over- and undershoots and chemically induced temperature oscillations have been observed. After that, the steady state and dynamic behavior of an adiabatic packed bed reactor has been studied experimentally. Temperature profiles of both the gas and solid phase as well as local temperature differences between the two phases were measured. Also here the temperature in the reaction zone exhibited oscillatory behavior. On addition of CO, the oscillations disappeared and the selectivity improved. For a given set of operating conditions there existed a relatively small range of CO contents with good selectivity and satisfactory conversion. This range depends strongly on the inlet temperature. The dynamic response of the reactor to changes in the CO content showed a considerable wrong-way behavior. This high sensitivity to fluctuations in the CO content, found for our experimental reactor, indicates a probable cause for a thermal runaway in industrial practice. Recommendations for a stable reactor operation are given.