A method and device for the reaction of a solid, in the shape of the particles present in the heat evaporable reaction participant with a gaseous reaktionsteilnemer

摘要

PICT:0819051/III/1 In an apparatus for reacting solids with gases, the solid in particulate form is carried as a suspension in an inert gas heated to a temperature below the softening point of the solid, through a cooling zone immediately after which it passes together with the reactant gas heated to a temperature above the softening point of the solid, to a vaporizer where the solid particles react with the gas and then flow into a reactor which may contain a dehydrating catalyst. For example, phthalonitrile is made by feeding iso-or terephthalic acid through a star valve into a tube 7, Fig. 1, where it forms a suspension in nitrogen heated at 60/400 DEG F. admitted in a pipe 9. Ammonia gas admitted through a pipe 10 and heated at 800/100 DEG F. carries the suspension into a vaporizer 14, any conducted heat being absorbed in a jacket condenser 11, which prevents the solid particles melting in advance of the ammonia treatment. The mixed product passes to a dehydration reactor, heated externally at 750 DEG to 850 DEG F., and containing a catalyst, e.g. alumina, silica, or thoria, whereby phthalonitrile is formed. This is recovered from the vapours issuing from a line 15, by solvent extraction or by crystallization.ALSO:Phthalonitriles are made by feeding powdered iso- or terephthalic acid into a tube 7, Fig. 1, where it forms a suspension in nitrogen heated below the melting-point of the acid, and injected through a pipe 9. Ammonia gas admitted through a pipe 10 and heated at 800/1000 DEG F. carries the suspension into a vaporizer 14, any PICT:0819051/IV (b)/1 conducted heat being absorbed in a jacket condenser 11, which prevents the acid particles melting in advance of the ammonia treatment. The mixed product passes to a dehydration reactor 15, heated externally to 750 DEG to 850 DEG F., and containing a catalyst, e.g. thoria, silica, or alumina, whereby phthalonitrile is formed, substantially free from side-reaction products. The product vapours issuing from a line 22 are submitted to solvent extraction, or crystallization to recover the phthalonitrile.