US 5,076,910 AGranted

Removal of particulate solids from a hot hydrocarbon slurry oil

AssigneePhillips Petroleum Company

InventorJohn B. Rush

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Abstract

A method for removing particulate solids, such as catalyst fines, from a hot slurry oil having a gravity of 5.degree. API to 15.degree. API, an atmospheric pressure initial boiling point of from about 500.degree. F. to about 750.degree. F. and an atmospheric pressure end point of less than 1,000.degree. F. which entails mixing a preselected amount of the slurry oil with a preselected amount of a hot vacuum reduced crude oil having equilibrium flash vaporization characteristics such that when the mixture is subjected to a selected temperature in a vacuum tower maintained at a vacuum of from about 1.0 mm Hg to about 10.0 mm Hg, at least 85 volume percent of the slurry oil will be flashed overhead and not more than about 15% of the vacuum reduced crude oil will be flashed overhead, and the particulate solids will remain in the liquid bottoms.

Claims16

Dependent claims

A method of treating a hot, refractory hydrocarbon slurry oil having an initial boiling point at atmospheric pressure at least as high as 500.degree. F., and having a gravity of from about 5.degree. API to about 15.degree. API, to remove solid particulate material the slurry oil comprising:

mixing with the hot slurry oil, a hot vacuum reduced crude oil having an initial boiling point at atmospheric pressure which is higher than the initial boiling point at atmospheric pressure of the slurry oil, and having an end point at atmospheric pressure which is higher than the end point at atmospheric pressure of the slurry oil, said hot vacuum reduced crude oil being mixed with the slurry oil in a quantity and at a temperature such that, when the mixture is subjected to flashing in a vacuum flash zone at a pressure of from 1.0 mm Hg to about 10.0 mm Hg, a temperature of less than 700.degree. F. and more than about 300.degree. F. can then be selected for maintenance in the vacuum flash zone, based on the equilibrum flash vaporization properties of the mixed slurry oil and reduced crude oil, so as to cause a major portion of the slurry oil in the mixture to vaporize and be recoverable as overhead from the vacuum flash zone;
then
charging the mixture of hot vacuum reduced crude oil and hot slurry oil to a vacuum flash zone having a pressure of from 1.0 mm Hg to about 10.0 mm Hg and at said selected temperature of less than 700.degree. F. and more than 300.degree. F. to thereby vaporize a major portion of the slurry oil in said mixture, and to thereby transfer substantially all of the solid particulate material into the bottoms liquid remaining in the flash zone following the completion of said vaporization;
recovering the overhead;
and
recovering the liquid bottoms containing the solid particulate material.

3 more elements

A process for removal of solid particulate catalyst ash from a highly refractory slurry oil derived from a fluidized catalytic cracker to produce a clarified oil free of such particulate catalyst ash and suitable as a feedstock for carbon black production, the slurry oil having an API gravity of from about 5.degree. to about 15.degree., and further having an end point at the upper end of its boiling range which is less than 1,000.degree. F., said process comprising:

heating the slurry oil to a temperature of from about 500.degree. F. to about 650.degree. F.;
then
mixing with the slurry oil, a hot vacuum reduced crude oil having an initial boiling point at least as high as 1,000.degree. F., and thus higher than the end point of the slurry oil, said hot vacuum reduced crude oil being at a temperature from about 600.degree. F. to about 700.degree. F. at the time of mixing with the slurry oil, and with said mixing being in a selected volumetric ratio of reduced crude oil to slurry oil such that substantially all of the slurry oil will be flashed overhead when charged to a flash vaporization chamber as subsequently specified herein;
then
charging the mixture of slurry oil and hot vacuum reduced crude oil to a flash vaporization chamber operated at a pressure from about 1.0 mm Hg to about 10.0 mm Hg, and at a temperature of less than 700.degree. F. and selected to flash vaporize substantially all of the slurry oil to yield a clarified oil overhead suitable as a feedstock for the production of carbon black.

2 more elements

Dependencies are inferred from the claim text.