Viscosity reduction system and method

Abstract

The invention relates to the field of ethylene production, and discloses a viscosity reduction system and method. The viscosity reduction system comprises an extraction tower, a solvent recovery tower, a solvent tank, an extraction phase heater, a light oil stripping tower, a raffinate phase heater, a raffinate phase solvent separation tower, a heavy oil stripping tower and a pressure pump. A high-viscosity oil feeding hole and a solvent feeding hole are formed in the extraction tower; the top of the extraction tower is sequentially connected with the extraction phase heater and the solvent recovery tower; the top of the solvent recovery tower is connected with the solvent tank, the bottom of the solvent recovery tower is connected with the light oil stripping tower, the bottom of the light oil stripping tower is provided with a light oil discharge port; the bottom of the extraction tower is sequentially connected with the raffinate phase heater and the raffinate phase solvent separation tower, the top of the raffinate phase solvent separation tower is connected with the solvent tank, the bottom of the raffinate phase solvent separation tower is connected with the heavy oil stripping tower; the bottom of the heavy oil stripping tower is provided with a heavy oil outlet, the tops of the light oil stripping tower and the heavy oil stripping tower are respectively connected with the pressure pump and the solvent tank in sequence; and the solvent tank is connected with the solvent feeding hole of the extraction tower. The viscosity reduction system can reduce the viscosity of an oil product and the solvent loss rate.

Description

technical field [0001] The invention relates to the field of ethylene production in petrochemical industry, in particular to a system and method for reducing viscosity. Background technique [0002] Viscosity affects the mass transfer ability and heat transfer ability of oil. High viscosity oil will consume more energy during pipeline transportation due to its high viscosity, low diffusion coefficient, and large resistance to mass transfer and heat transfer. The more heat exchange area, the longer the residence time is required in the reaction. In conclusion, high viscosity oils cause more energy waste and material loss in petroleum and chemical operations. [0003] Take quench oil as an example, its viscosity range at 50℃ is 10mm 2 / s~10000mm 2 / s, is a typical high-viscosity oil. As an important heat transfer medium for ethylene plants, the increase in its viscosity can directly affect the normal operation of cracking furnaces, oil scrubbers and dilution steam generatio...

AI Technical Summary

Problems solved by technology

In this invention, the viscosity of the viscosity-reducing quenching oil obtained from the separation of the solvent recovery tower and tower can only be reduced to 21mm 2 / s (approximately equivalent to 20-23mPa s), and the method of multi-stage recovery for the extracted phase has also improved the recovery rate of the solvent, but there is still a part of the solvent loss, resulting in heavy oil and light oil containing solvent, such as for Subsequent treatment of solvents in light oil will increase the processing load of downstream devices, and will also have an impact on the environment, and the cost of supercritical extraction equipment is also high

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