Texaco Inc.

Other

James H Colvert

John P MacLean

Dale Williams

Frederick C Jahnke

Thomas A Lionetti

Ting Y Chan

Henry B Jones

Joel S Bittensky

John Clifton Cooper

An improvement has been found in the gas recovery section of a delayed coking process. In the improvement the compressor discharge is amine scrubbed to remove hydrogen sulfide. The compressor discharge is the entire vapor feed to the gas recovery section and contains about 90% of the hydrogen sulfide. This has been found to cause a significant drop in both the depropanizer and debutanizer pressure and allow a saving in the investment cost of the pressure vessel. Synergistically a reduced amount of hydrogen sulfide is present in the entire gas recovery section. The remaining 10% of the hydrogen sulfide is removed by amine scrubbing the fuel gas and propane/propylene fractions.

Desulfurizing in a delayed coking process

A system controls a delayed coker in which a heavy liquid hydrocarbon feedstock is thermally decomposed to a solid coke product in a cyclical process. When the coking portion of the cycle is completed, the coke in the drum is cooled by quench water, and the quench water is then passed from the coke drum through a manifold to a drain conduit. Hot vapor is passed through the coke drum, via the same manifold to warm the coke drum. A temperature controller, valve actuator and ball valve allow passage of vapor to the coker fractionator at a manifold temperature at which all water is in the vapor state. Manifold temperatures at which liquid water may exist causes the ball valve to close, preventing liquid water from flowing into the coker fractionator. Upset of the coker fractionator is prevented.

Control system for delayed coker

In an ebullated bed reactor it has been found that an improved gas-liquid separator effectively removes gas from recycle liquid used to ebullate the catalyst bed. The gas-liquid separator comprises a cup with a plurality of riser conduits. Helical members are positioned within the riser conduits which impart a tangential velocity component to the fluid. Cyclone separators effect the final liquid-vapor separation. Vapor is directed to a vapor rich zone in the reactor.

Liquid degaser in an ebullated bed process

A bubble cap assembly and distributor plate is revealed uniquely suited for a reactor in an ebullated bed process. In the riser of the bubble cap assembly a ball check valve is mounted on a valve seat. An orifice mixer below the valve seat delivers a homogeneous vapor-liquid mixture to the orifice in the valve seat thereby minimizing slug flow which causes destructive valve chatter. The fluid outlet port is positioned in the riser to hydraulically limit ball travel between the valve seat and the cap, eliminating the need for pins or other restraints.

Bubble cap assembly in an ebullated bed reactor

A method for supplying spent catalyst to a catalyst regenerator comprises (1) guiding the flow of spent catalyst from the lower end of a spent catalyst standpipe downwardly therefrom and (2) curving the downward flow of spent catalyst away from the wall of the catalyst regenerator towards the vertical center line of the air distributor for providing the most thorough and even distribution of spent catalyst and air. An extension tube means for performing the method is also disclosed.

Method of FCCU spent catalyst regeneration and extension tube means

An improved air ring for a regenerator in a fluid catalytic cracking process in which a baffle extends vertically downward from the air ring for a critical length. The baffle prevents catalyst erosion on the underside of the air ring and improves air distribution in the catalyst bed.

Air distributor for FCCU catalyst regenerator

An improved process for recovering energy via an expander turbine axial flow gas compressor set which utilizes hot regeneration gas recovered from the regeneration of fluidized catalytic cracking catalyst, and during turndown conditions when the output of the gas compressor is required to be increased by an excess amount to prevent surge and the excess amount is normally vented to the atmosphere prior to entering the regenerator to prevent afterburn, the process including the steps of:

Process for improving power recovery from regeneration gas under

Apparatus for the regeneration of fluidized solid catalyst including a regeneration chamber adapted to hold a fluidized solids bed, oxygen containing gas source communicating with the chamber, a tangential inlet communicating with the regeneration chamber to impart a swirling motion to spent catalyst entering the regeneration chamber and a free standing drawoff conduit disposed within the regeneration chamber, the drawoff conduit having an upper, open end in communication with the solids bed, the open end being formed by an obliquely truncated, outwardly flared portion of the conduit, the high portion of said truncated conduit lying closest the spent catalyst inlet.

Apparatus for the regeneration of solid catalyst

The present application discloses a fluidized catalytic cracking process wherein intermediate cycle gas oil is stripped of light cycle gas oil components employing reboiled intermediate cycle gas oil as stripping vapor for improving light cycle gas oil yield, reducing feed preheat requirements, and reducing sour water production from a fluidized catalytic cracking unit.

Fluidized catalytic cracking process with improved intermediate cycle

The present application discloses a fluidized catalytic cracking process wherein light cycle gas oil is stripped of heavy naphtha components employing reboiled light cycle gas oil as stripping vapor. Heavy naphtha vapors stripped from the light cycle gas oil are returned to the reaction vapor as primary stripping vapor. This process results in increased naphtha octanes, and reduced sour water production from a fluidized catalytic cracking unit.

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Houston, TX, United States of America

James H Colvert