40458-98-8Relevant articles and documents
The isopropylation of naphthalene over USY zeolite with FAU topology. The selectivities of the products
Sugi, Yoshihiro,Joseph, Stalin,Ramadass, Kavitha,Indirathankam, Sathish Clastinrusselraj,Premkumar, Selvarajan,Dasireddy, Venkata D.B.C.,Yang, Jae-Hun,Al-Muhtaseb, Alaa H.,Liu, Qing,Kubota, Yoshihiro,Komura, Kenichi,Vinu, Ajayan
, p. 606 - 615 (2021/03/31)
The isopropylation of naphthalene (NP) over USY zeolite (FAU06, SiO2/Al2O3 = 6) gave all eight possible diisopropylnaphthalene (DIPN) isomers: β,β- (2,6- and 2,7-), α,β- (1,3-, 1,6-, and 1,7-), and α,α- (1,4- and 1,5-). Th
Production method of diisopropylnaphthalene
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Paragraph 0101-0112, (2017/01/02)
The invention relates to a production method of diisopropylnaphthalene, and mainly solves the problems in the prior art that 2,6-diisopropylnaphthalene is low in selectivity and quick in catalyst deactivation; the catalyst used in the production method is organic silicalite which comprises components in the following mole relationship: (1/n)Al2O3:SiO2:(m/n)R, wherein in the formula n=5-250, m=0.01-50, and R is at least one from alkyl, alkylene or phenyl; the Si29 solid-state NMR (nuclear magnetic resonance) spectroscopy of the organic silicalite at least includes one Si29 nuclear magnetic resonance spectral peak between -80-+50 ppm; the X-ray diffraction pattern of the organic silicalite has the maximum spacing value d at 12.4+/-0.2, 11.0+/-0.3, 9.3+/-0.3, 6.8+/-0.2, 6.1+/-0.2, 5.5+/-0.2, 4.4+/-0.2, 4.0+/-0.2 and 3.4+/-0.1 angstroms, so that the organic silicalite can be used in industrial production of diisopropylnaphthalene.
Isopropylation of naphthalene by isopropanol over conventional and Zn- and Fe-modified USY zeolites
Banu, Marimuthu,Lee, Young Hye,Magesh, Ganesan,Lee, Jae Sung
, p. 120 - 128 (2014/01/06)
Catalytic performances of USY, MOR, and BEA zeolites were compared for the isopropylation of naphthalene by isopropyl alcohol in a high-pressure, fixed-bed reactor. The USY catalyst showed a high conversion of 86% and good stability but a low 2,6-/2,7-DIPN shape selectivity ratio of 0.94. In contrast, over the MOR catalyst, 2,6-DIPN was selectively synthesized with a high 2,6-/2,7-DIPN ratio of 1.75, but low naphthalene conversions and fast deactivation of the catalyst were observed. The USY catalyst was modified by Zn and Fe using the wet impregnation method to enhance the selectivity for 2,6-DIPN. The highest conversion (~95%) and selectivity for 2,6-DIPN (~20%) were achieved with 4% Zn/USY catalyst. It appeared that small metal oxide islands formed in the USY pores to decrease the effective pore size and thus render it mildly shape-selective. Zn loading also decreased the number of strong acid sites responsible for coke formation and increased the number of weak acid sites. The high conversion and stability of Zn-modified catalysts were ascribed to the presence of a suitable admixture of weak and strong acid sites with less coke deposition. The Fe-modified USY catalysts were less effective because the modification increased the number of the strong acid sites.
