Abstract
In this study, modified zeolite was used to improve p-xylene selectivity in toluene dis-proportionation process. ZSM-5 zeolite was modified by introducing the phosphorus/Germanium loading and vacuum UV treatment from He+O2 microwave plasma treatment. Results showed that the ZSM-5 zeolite impregnated with Germanium and phosphorus have high p-xylene selectivity (up to 33 %). A sharp decrease in the acidity properties was achieved after phosphorus loading. By Germanium loading, selectivity increased but conversion did not change much. Also, the highest p-xylene selectivity (47 %) was obtained by P/Ge ZSM-5 with VUV treatment at the highest WHSV of 85 h-1.
Highlights
Xylenes are very important materials for various processes like production of resins, plasticizers and synthetic fibers. p-xylene is one of the isomers of xylenes that has the highest market demand [1]. pXylene is mainly an important intermediate in the production of terephthalic acid and dimethyl terephthalate, so these compounds are used to make some polyesters [2,3]
The xylenes are produced through catalytic reforming of naphtha, pyrolysis gasoline stream in a naphtha steam cracker, transalkylation and through toluene disproportionation process [4,5]
Among all the implemented technologies for producing p-xylene, Toluene disproportionation is promising to become an important process in the chemical industry
Summary
Xylenes are very important materials for various processes like production of resins, plasticizers and synthetic fibers. p-xylene is one of the isomers of xylenes that has the highest market demand [1]. pXylene is mainly an important intermediate in the production of terephthalic acid and dimethyl terephthalate, so these compounds are used to make some polyesters [2,3]. Xylenes are very important materials for various processes like production of resins, plasticizers and synthetic fibers. The xylenes are produced through catalytic reforming of naphtha, pyrolysis gasoline stream in a naphtha steam cracker, transalkylation and through toluene disproportionation process [4,5]. Among all the implemented technologies for producing p-xylene, Toluene disproportionation is promising to become an important process in the chemical industry. Different acidic catalysts are used in the toluene disproportionation process. Zeolites are crystalline 3D structure of sodium aluminum silicates. They are most promising as the versatile substances for catalysts production in petrochemical chemistry [9,10]. They are most promising as the versatile substances for catalysts production in petrochemical chemistry [9,10]. other applications are included environmental protection [11,12] and adsorption [13] because of special channel structure, high BET surface area, abundant acid sites and thermal and hydrothermal stability [14]
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