24-04-2014 дата публикации
Номер: US20140114106A1
A reforming process using a medium pore zeolite under conditions to facilitate the conversion of Cparaffinic compounds to para-xylene is provided. Para-xylene is produced at greater than thermodynamic equilibrium concentrations using the process. 1. A process for producing para-xylene comprising the steps of:(a) contacting a hydrocarbonaceous feed wherein at least 50 wt. % of said feed boils above 550° F., in a first reaction zone comprising a hydrocracking catalyst under hydrocracking conditions to form an effluent;{'sub': 8', '8, '(b) separating the effluent into at least a Ccontaining fraction comprising at least 10 wt. % Cparaffinic hydrocarbons;'}{'sub': '8', '(c) providing the Ccontaining fraction to a second reaction zone;'}{'sub': '8', '(d) contacting the Ccontaining fraction under reforming reaction conditions with a reforming catalyst comprising a medium pore zeolite having a silica to alumina molar ratio of at least 200, a crystallite size of less than 10 microns and an alkali content of less than 5000 ppm in a second reaction zone to produce a product stream comprising para-xylene and meta-xylene wherein the para-xylene to meta-xylene ratio is at least 0.9; and'}(e) separating the para-xylene from the product stream.2. The process of claim 1 , wherein the reforming catalyst comprises silicalite.3. The process of claim 1 , where the medium pore zeolite is selected from the group consisting of ZSM-5 claim 1 , ZSM-11 claim 1 , ZSM-12 claim 1 , ZSM-22 claim 1 , ZSM-23 claim 1 , ZSM-35 claim 1 , ZSM-38 claim 1 , ZSM-48 claim 1 , MCM-22 claim 1 , SSZ-20 claim 1 , SSZ-25 claim 1 , SSZ-32 claim 1 , SSZ-35 claim 1 , SSZ-37 claim 1 , SSZ-44 claim 1 , SSZ-45 claim 1 , SSZ-47 claim 1 , SSZ-58 claim 1 , SSZ-74 claim 1 , SUZ-4 claim 1 , EU-1 claim 1 , NU-85 claim 1 , NU-87 claim 1 , NU-88 claim 1 , IM-5 claim 1 , TNU-9 claim 1 , ESR-10 claim 1 , TNU-10 claim 1 , and combinations thereof.4. The process of claim 3 , wherein the medium pore zeolite is selected from the ...
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