Selective hydrocracking of normal paraffin
AssigneeChevron U.S.A. Inc.
InventorsJoel SCHMIDT, Cong-Yan CHEN, Theodorus Ludovicus Michael MAESEN, Dan XIE
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Abstract
Provided is a process for hydrocracking normal paraffins into lighter normal paraffins with minimal formation of iso-paraffins. The process comprises hydrocracking a hydrocarbon feedstock comprising normal paraffins under hydrocracking conditions. The reaction is run in the presence of a specific type of zeolite based catalyst which has been found to provide high conversion with minimal iso-paraffin products. In one embodiment, the zeolite is of the framework PWO. The reaction conducted in the presence of the zeolite based catalyst produces an n-paraffin rich product that needs no separation step before being fed to a steam cracker to produce lower olefins.
Claims24
A process for hydroconversion of normal paraffins, comprising:
- subjecting a hydrocarbon feedstock comprising at least 5 wt. % normal paraffins to a hydroconversion reaction under hydroconversion conditions in the presence of a zeolite-based catalyst with a void greater than 0.35 nm in diameter accessible through channels with a shorter diameter greater than 0.30 nm and a longer diameter of less than 0.50 nm.
A process for preparing a catalyst for hydroconversion of normal paraffins comprising:
- a) choosing a zeolite that has a pore system with access through channels less than 0.45 nm in diameter and expansions greater than 0.5 nm in diameter;
- b) confirming the zeolite in n-C10 hydrocracking exhibits an iC4/nC4 in the product less than 0.5;
- and
- c) loading the zeolite with a hydrogenation function metal to thereby prepare a hydroconversion catalyst.
A zeolite-based catalyst that is loaded with a hydrogenation function metal, and the zeolite has voids greater than 0.35 nm in diameter accessible through channels with a shorter diameter greater than 0.30 nm and a longer diameter of less than 0.50 nm, and which in n-C10 hydrocracking exhibits an iC4/nC4 product ratio of less than 0.5.
Dependencies are inferred from the claim text.