Salt bath for heating, composition

The next level of catalyst screening is then performed at the bench-scale level to determine the best catalyst shapes and active mass compositions for extended time periods. The bench-scale units used at Clariant are parallelized at 4 to 10 reactor tubes. At this level of testing, the reactor diameters typically used are fully comparable to industrial scale, only the reactor length is reduced to about 1.5 m. At this stage of testing, industrially-used salt bath cooling/heating is applied so as to remove the heat of reaction, similar to that found in an industrial operation (Fig. 12.5). 

The experiments were conducted batchwise in small stainless-steel pipe-bombs immersed in a molten-salt bath that was maintained at a desired, constant temperature. Pipe-bomb heat-up and quench times, on the order of 1 min each, were negligible compared with reaction times, which were on the order of 1 hr. The reagents used were obtained commercially all were of purity > 98% except for the A2-dialin which had a composition of ( 0)> 0 0 9 Q)) = 9 20, 64) mol%. The proportions of sub-... 

---