| 摘要 |
1,223,761. Exothermic chemical reactions; temperature-control. REICHHOLD CHEMICALS Inc. 1 May, 1968 [14 June, 1967], No. 20553/68. Heading B1X. [Also in Division F4] Exothermic chemical reactions are carried out within catalyst-containing tubes 17 extending between headers 13, 14 and surrounded by a shell 11 which is supplied through inlet 20 with a liquid heat-transfer medium which boils as it removes heat from the reaction taking place within the tubes; the mixture of liquid-vapour heat-exchange medium flows through outlet pipe 21 into vessel 22, the vapour flows through pipe 23 to a condenser the cold condensate flows through pipe 25 to vessel 22 where it mixes with hot liquid heatexchange medium, and the mixture flows back to the shell of the reactor through pipe 24. The reactants are introduced into the tubes through inlet 15, and the products flow out through outlet 16. The rate of thermosyphon flow of heat transfer medium may be regulated by increasing or decreasing the liquid level in the reactor or vessel 22. By these means a favourable temperature profile along the catalyst beds is maintained. The reactor may be used for the production of formaldehyde by vapour phase oxidation of methanol.
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