Mesoporous zeolites and uses thereof in dewaxing hydrocarbon feeds
AssigneeZeopore Technologies NV
InventorsDanny Verboekend, Martin D'Halluin
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Abstract
The present invention relates to the field of dewaxing of hydrocarbon feeds. More in particular, it relates to the use of alkaline-treated mesoporous zeolites and catalysts encompassing the same for the dewaxing of hydrocarbon feeds. It was found that the zeolites and catalysts of the present invention can significantly reduce cracking of the hydrocarbon feed, and accordingly significantly reduce liquid hydrocarbon feed loss during processes such as dewaxing.
Claims17
A method for dewaxing a hydrocarbon feedstock under dewaxing conditions, comprising the steps of:
- providing a hydrocarbon feedstock to a reactor;
- providing a catalyst to the reactor, and
- contacting the hydrocarbon feedstock with the catalyst,
- wherein the catalyst comprises at least 300 ppm of platinum or palladium and an alkaline-treated mesoporous zeolite,
- wherein the alkaline-treated mesoporous zeolite has a magnesium content in the range of 0.3 wt % to 10 wt %, a framework density (FDsi) of 17 to 20 T/nm3 of MTT, TON, MRE, MFI or MEL, and a mesopore volume of 0.4 to 1.2 ml/g, and wherein the alkaline-treated mesoporous zeolite is prepared by an alkaline treatment comprising the steps of:
- providing a parent zeolite to an aqueous solution, wherein the aqueous solution has a pH of at most 8, and comprises at least a magnesium salt;
- adding a base to the reaction mixture, wherein the pH of the aqueous reaction mixture is increased to at least 10;
- reacting the base and the parent zeolite thereby obtaining said alkaline-treated mesoporous zeolite;
- and
- separating the alkaline-treated mesoporous zeolite.
A dewaxing catalyst comprising an alkaline-treated mesoporous zeolite with the MTT framework topology and at least 300 ppm of Pt or Pd, wherein the alkaline-treated mesoporous zeolite further comprises a molar Si/Al ratio of at least 20, a mesopore volume in the range of 0.4 to 1.2 ml/g, an external surface in the range of 100 to 350 m2/g, a Brønsted acidity as measured using pyridine of at least 50 μmol/g, and a magnesium content in the range of 0.3 wt % to 10wt %.
An alkaline-treated mesoporous zeolite with the MTT framework topology,
- wherein the alkaline-treated mesoporous zeolite further comprises a molar Si/Al ratio of at least 20, a mesopore volume in the range of 0.4 to 1.2 ml/g. an external surface in the range of 100 to 350 m2/g, a Brønsted acidity as measured using pyridine of at least 50 μmol/g, and a magnesium content in the range of 0.3 wt % to 10 wt %.
Dependencies are inferred from the claim text.