초록 ▼

Whole crude and residual fractions from distillation of petroleum and like feed stocks are subjected to selective vaporization to prepare heavy fractions of reduced Conradson Carbon and/or metals content by short-term, high temperature riser contact with a substantially inert solid contact material

Whole crude and residual fractions from distillation of petroleum and like feed stocks are subjected to selective vaporization to prepare heavy fractions of reduced Conradson Carbon and/or metals content by short-term, high temperature riser contact with a substantially inert solid contact material of low surface area in a selective vaporization zone. High boiling point components of the charge which are of high Conradson Carbon number and/or high metal content remain on the contact material as a combustible deposit which is then burned off in a combustion zone whereby the contact material is heated to a high temperature for return to the selective vaporization zone to supply the heat required therein. The system is dynamically controlled for fuel supply in the combustion zone by the lower hydrogen content, least valuable components of the feed. That control is exercised by controlling the temperature of the selective vaporization zone to about the minimum value which will maintain a predetermined desired temperature in the combustion zone.

대표청구항 ▼

In a process for decarbonizing or demetallizing a hydrocarbon charge of whole crude or a residual fraction thereof by contacting said charge in a confined rising vertical column with a finely divided solid contact material consisting essentially of an inert solid material having a microactivity for

In a process for decarbonizing or demetallizing a hydrocarbon charge of whole crude or a residual fraction thereof by contacting said charge in a confined rising vertical column with a finely divided solid contact material consisting essentially of an inert solid material having a microactivity for catalytic cracking not substantially greater than 20 at low severity, including a temperature of at least about 900°F. for a period of time less than about 3 seconds and less than that which induces substantial thermal cracking in said charge, at the end of said period of time separating a selectively vaporized major portion of said charge from said contact material bearing the unvaporized portion of the charge as deposit thereon, contacting said contact material bearing said deposit in a combustion zone with oxidizing gas to burn said deposit and generate heat whereby the temperature of said contact material is elevated by combustion of said unvaporized portion of the charge as fuel for the process, recycling the so heated contact material to renewed contact with said hydrocarbon charge, the improvement which comprises sensing the temperature of said confined column, regulating the rate of recycling said so heated contact material responsive to the temperature so sensed to maintain said sensed confined column temperature at a predetermined value and dynamically controlling the system for the purpose of utilizing low hydrogen content, low value portions of said charge as said fuel for the process which dynamic control comprises adjusting said predetermined value of said sensed confined column temperature to about the minimum level at which said deposit provides the quantity of fuel which will, on combustion, maintain said combustion zone at a predetermined temperature; said adjustment being effected (a) by reducing said predetermined temperature of said rising confined column to provide more fuel in order to correct a trend toward lower temperature in said combustion zone or (b) by increasing said predetermined temperature of said rising confined column to provide less fuel in order to correct a trend toward higher temperature in said combustion zone.