B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/395.2
B01J 19/00 (2006.01) C07C 51/43 (2006.01)
Patent
CA 1189685
Abstract of the Disclosure: In installations for the production of phthalic anhydride, the reaction product is precipitated in a solid form on heat exchange sur- faces of separators, and is subsequently melted off again, by alternately cooling and heating the separators. The arrangement employed, according to the invention, for transferring the heat and for levelling out the tempera- ture profiles (in which, in the heating phases, there is a peak demand for heating steam, which impedes the useful generation of steam by the exothermic reaction), com- prises a heat transfer system consisting of three circuits at different temperatures. A storage circuit (hot oil circuit) at a higher temperature is superposed on the heating circuit operating at a pre- determined temperature. Using the hot oil circuit, the separators are provided, during the heating phase, with the heat required to melt off the reaction product. This superposition of 3 circuits at different tempera- tures produces a levelling of the steam requirement and hence allows more effective utilization of the excess steam.
370705
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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