Melamine prodn. by conversion of urea at elevated temp. - in an appts. of austenitic alloy steel contg. chromium, nickel, titanium and carbon to avoid corrosion

摘要

Melamine is produced by conversion of urea and/or thermal decompsn. prods. of this at a press. of 0.5-25 bar and a temp. of 300-450 deg.C, using an appts. in which at least part of the surface in contact with the reaction mixt. is made of an alloy with an austenitic structure and consisting of 16-19wt.% Cr, 8-14wt.% Ni, 0.03-0.12wt.% C, a Ti content of between 5 times the carbon content and 1.0wt.%, and a remainder of iron and minor impurities.