Texaco Inc.

David E Self

Glenn A Clausen

Roy E Pratt

Gerald V Nelson

Govanon Nongbri

Charles H Schrader

Philip A Lane

Joseph C Demeter

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.

Ebullated bed process

SO.sub.x in regenerator off gas in a fluid cracking unit is decreased by providing in the regenerator bed, a metal grid bearing a layer of rare earth oxide.

Reduction of SO.sub.x in regenerator off gas of a fluid cracking unit

A mixture of hydrocarbons consisting of gas oil and residual oil is catalytically cracked in the presence of a fluidized zeolite catalyst. The mixture of hydrocarbons is classified by boiling range as a 550.degree.-1000.degree. F. gas oil and a 1000+.degree. F. vacuum residuum. The gas oil is selectively cracked using a freshly regenerated fluid zeolite catalyst having less than 0.1 wt % residual carbon to give a high yield of desirable liquid hydrocarbon boiling from about 60.degree.-670.degree. F. The vacuum residuum is injected into the riser reactor at a point near the riser outlet to quench the cracking reactions in the gas oil. The vacuum residuum undergoes a small amount of reaction removing undesirable materials and yielding a liquid hydrocarbon boiling up to about 1000.degree. F. The amount of vacuum residuum cracking and overall yield of liquid hydrocarbons are controlled by downstream injection of vacuum residuum into the riser.

Fluid catalytic cracking of vacuum residuum oil

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Port Neches, TX, United States of America

David E Self