24157-81-1Relevant articles and documents
The isopropylation of naphthalene with propene over H-mordenite: The catalysis at the internal and external acid sites
Sugi, Yoshihiro,Anand, Chokkalingam,Subramaniam, Vishnu Priya,Stalin, Joseph,Choy, Jin-Ho,Cha, Wang Soo,Elzatahry, Ahmed A.,Tamada, Hiroshi,Komura, Kenichi,Vinu, Ajayan
, p. 543 - 552 (2014)
The isopropylation of naphthalene (NP) with propene over H-Mordenite (MOR) was studied under a wide range of reaction parameters: temperature, propene pressure, period, and NP/MOR ratio. Selective formation of 2,6-diisopropylnaphthalene (2,6-DIPN) was observed at reaction conditions, such as at low reaction temperature, under high propene pressure, and/or with high NP/MOR ratio. However, the decrease in the selectivities for 2,6-DIPN was observed at reaction conditions such as at high temperature, under low propene pressure, and/or with low NP/MOR ratio. The selectivities for 2,6-DIPN in the encapsulated products were remained high and constant under all reaction conditions. These results indicate that the selective formation of 2,6-DIPN occurs through the least bulky transition state due to the exclusion of the bulky isomers by the MOR channels. The decrease in the selectivities for 2,6-DIPN are due to the isomerization of 2,6-DIPN to 2,7-DIPN at the external acid sites, directing towards thermodynamic equilibrium of DIPN isomers.
MOR/SBA-15 Composite Catalysts with Interconnected Meso/Micropores for Improved Activity and Stability in Isopropylation of Naphthalene
Banu, Marimuthu,Lee, Young Hye,Magesh, Ganesan,Nam, Chang-Mo,Lee, Jae Sung
, p. 2354 - 2360 (2015)
The isopropylation of naphthalene with isopropyl alcohol was studied over composites of MOR/SBA-15 in a high-pressure, fixed-bed reactor. The MOR catalyst showed a high 2,6-/2,7-diisopropyl naphthalene (DIPN) ratio of 1.75, but a low naphthalene conversion (54%) and fast deactivation of the catalyst. The composites of MOR/SBA-15 were prepared by a hydrothermal recrystallization process to obtain hierarchical micro/mesopores. During the process, MOR recrystallized in the mesopores of SBA-15, the structure of which was stabilized by carbon coating formed on the pore walls as a template. The best prepared MOR/SBA-15 catalyst achieved a high conversion of 85%, high stability, and less coking, while maintaining the high 2,6-/2,7-DIPN ratio (≈1.8). The modified micro/mesopore structure allowed facile diffusion of bulky molecules to and from active catalytic sites located in the small MOR pores as a result of the connection between the two types of pores in the MOR/SBA-15 composite. Networking of big and small: To improve naphthalene conversion in isopropylation of naphthalene, a hierarchical meso/micropore structure of zeolite composites is achieved by combining micropores of MOR with mesopores of SBA-15. In the hydrothermal recrystallization process, MOR recrystallizes in the mesopores of SBA-15 stabilized by carbon coating formed on the pore walls as a template.
Microwave-assisted regioselective alkylation of naphthalene compounds using alcohols and zeolite catalysts
Yamashita, Hiroshi,Mitsukura, Yumi,Kobashi, Hiroko,Hiroki, Kazuaki,Sugiyama, Jun-ichi,Onishi, Kiyotaka,Sakamoto, Tetsuo
, p. 145 - 149 (2010)
Regioselective alkylation of naphthalene compounds with alcohols smoothly proceeded in the presence of zeolite catalysts under microwave irradiation. A H-mordenite (H-M) zeolite catalyst (SiO2/Al2O3 ratio = 240) showed the highest efficiency. In the microwave reactions, high reaction rates and high selectivities for 2,6-dialkylnaphthalenes were achieved. In the best case for the reaction of 2-isopropylnaphthalene with isopropyl alcohol, the conversion and the selectivity were 43.5% and 66.4%, respectively. In di-tert-butylation of naphthalene with tert-butyl alcohol, the conversion and the selectivity reached 86.5% and 70.4%, respectively. The conversions and the selectivities were generally higher than those obtained by conventional oil bath heating.
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.
