Ebullated bed process
AssigneeTexaco Inc.
InventorsGovanon Nongbri, Gerald V. Nelson, David E. Self, Glenn A. Clausen
Life of this patent
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Abstract
An improvement has been discovered in an ebullated bed process. A residual hydrocarbon oil feedstock is hydrocracked to yield a product oil. The amount of sediment in the product oil is controlled by adjusting hydrogen partial pressure according to an algorithm. A change in temperature and residence time is avoided.
Claims5
A process comprising hydrocracking a residual hydrocarbon oil with a hydrogen-containing gas at a reaction temperature and a hydrogen partial pressure in an ebullated bed of particulate solid catalyst, to yield a product oil comprising sediment, wherein the improvement comprises:
- i. calculating a conversion according to the equation:
- ##EQU3## ii. selecting a target amount of sediment, and iii. selecting a hydrogen partial pressure to according to the equation:
- wherein:
- P.sub.H.sbsb.2 =f(conversion.sup.3 +1n sed)
- P.sub.H.sbsb.2 =hydrogen partial pressure, psia
- 1n sed=natural logarithm of the target amount of sediment, wt %.
- iv. hydrocracking at the selected hydrogen partial pressure P.sub.H.sbsb.2, thereby achieving the target amount of sediment at the calculated conversion.
A process comprising hydrocracking in an ebullated bed of particulate solid catalyst for conversion of a 1000.degree. F. residual hydrocarbon oil with a hydrogen-containing gas at a reaction temperature and a hydrogen partial pressure to yield a product oil having a sediment concentration, said conversion calculated according to the formula:
- ##EQU4## the process comprising:
- i. selecting a first operating point, defined by a first hydrogen partial pressure (P.sub.1), a first 1000.degree. F..sup.+ hydrocarbon oil conversion (C.sub.1) and a first product oil sediment concentration (s.sub.1) and hydrocracking at this first operating point,
- ii. hydrocracking at a second operating point, defined by a second hydrogen partial pressure (P.sub.2), and a second product oil sediment concentration (s.sub.2),
- iii. selecting a third operating point, defined by a third hydrogen partial pressure (P.sub.3), a third 1000.degree. F..sup.+ hydrocarbon oil conversion (C.sub.3) and a third product oil sediment concentration (s.sub.3),
- said third hydrogen partial pressure (P.sub.3) selected according to the equation:
- ##EQU5## and hydrocracking at this third operating point.
An ebullated bed process for a residual hydrocarbon oil with a hydrogen-containing gas at a reaction temperature and a hydrogen partial pressure in the presence of a bed of particulate solid catalyst, to yield a product oil comprising sediment, wherein the improvement comprises:
- i. calculating a conversion according to the equation:
- ##EQU6## ii. selecting a target amount of sediment, and iii. selecting a hydrogen partial pressure to achieve the target amount of sediment according to the equation:
- ##EQU7## wherein:
- P.sub.H.sbsb.2 =hydrogen partial pressure, psia
- 1n sed =natural logarithm of the target amount of sediment, wt %
- a'=2.6945
- b'=0.0009725
- c'=-0.0057844.
- iv. hydrocracking at the selected hydrogen partial pressure P.sub.H.sbsb.2, thereby achieving the selected target amount of sediment at the calculated conversion.
Dependencies are inferred from the claim text.