Heavy oil emulsion for catalytic cracking processing of heavy oil, preparation method and applications thereof

Abstract

The invention belongs to the technical field of catalytic cracking of petroleum refining, and particularly relates to a heavy oil emulsion for catalytic cracking processing of heavy oil, a preparationmethod and applications thereof. According to the heavy oil emulsion, an emulsifier and water are mixed as a dispersion phase, heavy oil is used as a continuous phase, and an inorganic monodisperse porous membrane is used as an emulsifying medium; the dispersion phase and the continuous phase are respectively positioned on the two sides of the inorganic monodisperse porous membrane; the pressureof the dispersion phase is 1.0-2.8 MPa, the pressure of the heavy oil is 0.8-1.7 MPa, the pressure of the dispersion phase is 0.2-2.0 MPa higher than the pressure of the continuous phase, and under the action of the pressure difference, the dispersion phase enters the continuous phase through the membrane pores in the inorganic monodisperse porous membrane; and the dispersion phase forms a uniformwater-in-oil type emulsion under the action of the continuous shearing force of the continuous phase. The water-in-oil emulsion formed by the method is uniform in liquid droplet size, the dispersityand the atomization degree of the catalytic cracking feed are improved, the cracking depth is increased, the product distribution of the catalytic device is improved, and the yield is increased. The invention also provides a preparation method and applications of the heavy oil emulsion.

Description

technical field [0001] The invention belongs to the technical field of catalytic cracking in petroleum refining, and in particular relates to a heavy oil emulsion used for catalytic cracking processing of heavy oil, its preparation method and application. Background technique [0002] With the decrease of conventional oil resources, the degree of heavy and poor quality of crude oil continues to intensify. Catalytic cracking is an important means of lightening heavy oil. In recent years, the proportion of heavy raw materials in catalytic cracking raw materials has increased year by year. How to increase the yield of light oil and reduce the yield of coke and dry gas is the key to catalytic cracking. The main problem I've been trying to solve. However, since the heavy oil is in a gas-liquid mixed state during the heavy oil catalytic cracking reaction, the atomization and vaporization process before contacting the catalyst particles plays a very important role in the whole rea...

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Problems solved by technology

However, the temperature of the heavy oil in this patent is too low to reach the preheating temperature of the catalytic cracking raw material. At the same time, this patent requires the ceramic membrane to be wetted in the dispersed phase for 6-12 hours to reduce the surface energy of the dispersed phase side, which is not conducive to industrial application.

A variety of heavy oil emulsions were prepared by using the disclosed methods and their examples. At the preheating temperature of catalytic cracking raw materials at 190°C-260°C, none of them could maintain a stable emulsion state. The pressure of the system increases, and the pressure of the reactor nozzle fluctuates greatly, which affects the stability of the catalytic cracking reaction system and causes catalyst deactivation, strength reduction and other undesirable phenomena, and cannot be used in catalytic cracking

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