Finned tube heat exchanger used as a desublimator for isolating sublimation, products, especially phthalic anhydride, from reaction gases

Abstract From the Canadian patent

A finned tube heat exchanger for isolating sublimates, especially phthalic anhydride in which the, finned tubes arranged in parallel alongside one another and above one another and connected by headers and tube bends permit flow through them successively in the first then the third, then the, second and then the fourth row and that the transverse fins are, arranged in rows staggered laterally in opposite directions by an amount corresponding to from half the spacing to the whole spacing between adjacent fin edges.