DISTRIBUTION OF METALLOPORPHYRINS AND PERYLENES DURING THE THERMAL-DIFFUSION SEPARATION OF CRUDE OILS

In the thermal diffusion separation of native crude oils, perylenes an d metalloporphyrins are concentrated mainly in fractions from the lowe r part of the thermal diffusion column. The higher thermal diffusion f ractions do not contain these compounds. The metalloporphyrin concentr ates produced during the thermal diffusion separation of crude oils ar e enriched with homologues of the ETIO (etioporphyrin) series. Porphyr ins of the DPEP (desoxophylloerythroetioporphyrin) series are mainly p resent in fractions from the middle part of the thermal diffusion colu mn. The proportion of nickel complexes in the metalloporphyrin mixture increases from the lower to the middle part of the thermal diffusion column.