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US 11,660,588 B2Granted
Catalyst for producing C8 aromatic hydrocarbon having reduced ethylbenzene content and preparation method therefor
AssigneeSK Innovation Co., Ltd.
InventorsSang Il Lee, Ji Hoon Lee, Young Eun Cheon, Yeon Ho Kim
Life of this patent
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Abstract
Disclosed are a catalyst and a preparation method therefor, the catalyst being able to maintain a high production yield of C8 aromatic hydrocarbons in the process of converting a feedstock containing alkyl aromatics to C8 aromatic hydrocarbons such as mixed xylene through disproportionation/transalkylation/dealkylation while reducing a content of ethylbenzene in the products.
Claims15
A method for preparing C8 aromatics, the method comprising the steps of:
- providing a feedstock containing benzene, toluene, and/or C9+ aromatics;
- and
- subjecting the feedstock to at least one reaction selected from disproportionation, transalkylation, and dealkylation in the presence of a catalyst to give a product having an increased amount of C8 aromatic hydrocarbons,
- wherein the catalyst comprises,
- (A) a mixed support comprising (i) an MFI-type first zeolite having a silica-alumina molar ratio (SAR) of 10 to 200 and containing a reduced form of palladium (Pd) within the pores and/or crystalline structure thereof through ion-exchange, and (ii) a second zeolite having a silica-alumina molar ratio of 10 to 200 and a pore size of 6 to 9 Å;
- and (B) at least one first metal supported onto the mixed support and selected from the group consisting of platinum (Pt), rhenium (Re), and molybdenum (Mo), in which the first metal is used in an amount of 0.01 to 5% by weight, based on the total weight of the catalyst, and
- wherein the C8 aromatic hydrocarbons contain ethylbenzene at a content of less than 1.5% by weight.
4 more elements
Dependencies are inferred from the claim text.