METHOD OF STABILIZATION OF THE MODE OF COLUMN- DEETHANIZERS, INCREASING THE DEGREE OF EXTRACTION OF PROPANE WITH OBTAINING OF PROPANE FROM ETHANEPROPIONIC FRACTION OR DURING PROCESSING HYDROCARBON FEEDSTOCK (HYDROCARBON FRACTIONS), COMPRISING OF LIGHT PROPIONIC FRACTION C1 C3 BY HIGH-TEMPERATURE RECTIFICATION AND INCREASING THE PRODUCTION RATE WITH POWER SUPPLY OF ANY HIGH-TEMPERATURE RECTIFYING COLUMNS DURING PROCESSING HYDROCARBON FEEDSTOCK (HYDROCARBON FRACTIONS)