METHOD OF CLEANING CARBON DIOXIDE FROM COMBUSTIBLE ADMIXTURES IN UREA PRODUCTION

摘要

The invention relates to the catalytic purification of compressed gases from combustible impurities, in particular to the purification of carbon dioxide 2. in the preparation of urea from ammonia. The goal is to reduce energy costs and metal consumption of equipment. Purification is carried out by compressed and initial carbon dioxide to 5-28 kg / cm2 and subsequent oxidation of impurities in the heated by compression of the gas over the palladium-containing catalyst at 155-172 ° C. C. Then, a multi-stage compression of the purified gas to the pressure in the synthesis zone is carried out while the released heat is removed by cooling the gas with circulating water between the compression steps. These conditions make it possible to eliminate the heat costs of preheating the carbon dioxide fed to the oxidation reactor, as compared with the known method. The amount of heat exchange apparatus is reduced. (L