Patent ID: 6096188
Filing Date: 2000-08-01
Classification: C07C,C10G

Abstract:
Method for operating an ethylene production plant utilizing oil, obtained as bottom product of the fractionating column, for steam production in the gasifying cracking process, in order to cool down the cracked flow exiting from the gasifying cracking reactor at the fractioning column, and wherein said oil is kept at a predetermined reference value of viscosity based on a plant safety level, said method comprising:drawing a quench oil sample at the bottom of said fractionating column operating from a predetermined operation temperature;measuring of the oil viscosity;adding to the oil flow of the quench oil circuit an amount of an anti-aging additive consisting of an effective quantity, with respect to said oil flow, of at least one component selected from the group consisting of alkylated phenols, alkylated biphenols, diphenols, alkylated diphenols, aromatic amines and nitroxides, precursors and mixtures thereof, selected accordingly to the measured value of said quench oil viscosity;testing the circuit oil viscosity response to the adding Of said amount of additive, at said predetermined operation temperature; andincreasing said operation temperature until said quench oil viscosity has increased to said predetermined reference value of viscosity.