The Daqing Petrochemical Company Research Institute has successfully developed a new quenching oil viscosity reducing agent and has applied for a patent.
In the ethylene cracking production process, naphtha, light hydrocarbons, etc. are thermally cracked between 750 and 850 ° C, and the cracked product is rapidly cooled to 350-450 ° C at the cracking furnace outlet. Then, it is mixed with the circulating quench oil and cooled to about 220 ° C to be sent to the quench oil tower.
A light component of carbon 9 or less is separated from the top of the quenching oil column, and the bottom of the column is a heavy component of carbon 9 or more. A portion of the material at the bottom of the quench tower is recycled to the feed to the quench tower. Since the feedstock of the quenching tower contains unsaturated aromatic hydrocarbons such as styrene and hydrazine, they will polymerize at high temperatures, and the formation of macromolecular substances leads to an increase in the viscosity of the quench oil during recycling, which reduces the heat exchange of the quench oil. effectiveness.
The new quenching oil viscosity reducer developed by Daqing Petrochemical Research Institute is made up of a polymerization inhibitor and a dispersant to form a viscosity reducing agent suitable for various ethylene equipment process conditions. The dispersant is bis-succinimide and the polymerization inhibitor is blocked. Formulated with phenolic antioxidants and phosphite antioxidants. The addition of this new viscosity reducing agent at the bottom of the quenching oil tower can effectively control the viscosity increase of the quench oil and at the same time reduce the fouling of the equipment in the quenching system of the ethylene cracking unit.
In the ethylene cracking production process, naphtha, light hydrocarbons, etc. are thermally cracked between 750 and 850 ° C, and the cracked product is rapidly cooled to 350-450 ° C at the cracking furnace outlet. Then, it is mixed with the circulating quench oil and cooled to about 220 ° C to be sent to the quench oil tower.
A light component of carbon 9 or less is separated from the top of the quenching oil column, and the bottom of the column is a heavy component of carbon 9 or more. A portion of the material at the bottom of the quench tower is recycled to the feed to the quench tower. Since the feedstock of the quenching tower contains unsaturated aromatic hydrocarbons such as styrene and hydrazine, they will polymerize at high temperatures, and the formation of macromolecular substances leads to an increase in the viscosity of the quench oil during recycling, which reduces the heat exchange of the quench oil. effectiveness.
The new quenching oil viscosity reducer developed by Daqing Petrochemical Research Institute is made up of a polymerization inhibitor and a dispersant to form a viscosity reducing agent suitable for various ethylene equipment process conditions. The dispersant is bis-succinimide and the polymerization inhibitor is blocked. Formulated with phenolic antioxidants and phosphite antioxidants. The addition of this new viscosity reducing agent at the bottom of the quenching oil tower can effectively control the viscosity increase of the quench oil and at the same time reduce the fouling of the equipment in the quenching system of the ethylene cracking unit.
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