Texaco Inc.

Stanley M Farabee

Gerald V Nelson

Govanon Nongbri

In an ebullated bed process, it has been found that in switching from one sediment yielding feedstock to a second sediment yielding feedstock that the transient sediment concentration has caused unit shutdowns with lost production. A method has been found which avoids these high transient sediment concentrations. Fresh addition is substituted for regenerated catalyst addition until the average carbon on catalyst in the bed drops to 22 wt% basis carbon free catalyst. Second feedstock is added incrementally and sediment in the product analyzed. After full second feedstock rate is achieved, first feedstock is reduced incrementally with sediment analysis. Higher unit utilization is achieved with the corresponding increased yearly production.

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Beaumont, TX, United States of America

Stanley M Farabee