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Received September 23, 2008
Accepted November 10, 2008
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The effect of phase transition of methanol on the reaction rate in the alkylation of hydroquinone
Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea 1Noksan Industrial Complex, Samsung Electro Mechanics, Busan 618-721, Korea
kjchang@bh.knu.ac.kr
Korean Journal of Chemical Engineering, May 2009, 26(3), 649-653(5), 10.1007/s11814-009-0108-8
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Abstract
An O-alkylation reaction of hydroquinone with excess methanol was carried out by using alkaline metal ion-exchanged zeolite catalysts at various phases of methanol in a slurry type reactor. The amount of methanol, used as a methylating agent and also a solvent, significantly affected the reaction rate. When the amount of methanol was decreased from 2 mol to 0.6 mol, the reaction rate was increased more than nine times. These changes in the reaction rate could be explained by the pressure change and the phase transition of the reactant, methanol, depending on the_x000D_
temperature and the elimination of a diffusion limitation of reactants through the zeolite pores in a gas phase condition. Thus, higher than 89% selectivity to 4-methoxyphenol was obtained at 80% conversion of hydroquinone at a gas phase reaction condition using 1 mol of methanol for 2 hours.
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References
Fu ZH, Ono Y, J. Catal., 145(1), 166 (1994)
Fu ZH, Ono Y, Catal. Lett., 21, 43 (1993)
Lee SC, Lee SW, Kim KS, Lee TJ, Kim DH, Kim JC, Catal. Today, 44(1-4), 253 (1998)
Hathaway PE, Davis ME, J. Catal., 116, 263 (1989)
Tsuji H, Yagi F, Hattori H, Chemistry Letters, 181 (1991)
Nath S, Bhattacharyya A, Sengupta PK, J. Ind. Chem. Soc., 60, 801 (1983)
Fu Y, Baba T, Ono Y, Appl. Catal. A, 176, 419 (1998)
Fu Y, Baba T, Ono Y, Appl. Catal. A: Gen., 176(2), 201 (1999)
Hattori H, Chem. Rev., 95(3), 537 (1995)
Davis RJ, Doskocil EJ, Bordawekar S, Catal. Today, 62(2-3), 241 (2000)
Lee SS, Lee SC, Kim JC, Korean J. Chem. Eng., 19(3), 406 (2002)
Yuan XD, Park JN, Wang J, Lee CW, Park SE, Korean J. Chem. Eng., 19(4), 607 (2002)
Zaidi HA, Pant KK, Korean J. Chem. Eng., 22(3), 353 (2005)
Kim JC, Li HX, Chen CY, Davis ME, Microporous Mater., 2, 413 (1994)
Fu ZH, Ono Y, Catal. Lett., 21, 43 (1993)
Lee SC, Lee SW, Kim KS, Lee TJ, Kim DH, Kim JC, Catal. Today, 44(1-4), 253 (1998)
Hathaway PE, Davis ME, J. Catal., 116, 263 (1989)
Tsuji H, Yagi F, Hattori H, Chemistry Letters, 181 (1991)
Nath S, Bhattacharyya A, Sengupta PK, J. Ind. Chem. Soc., 60, 801 (1983)
Fu Y, Baba T, Ono Y, Appl. Catal. A, 176, 419 (1998)
Fu Y, Baba T, Ono Y, Appl. Catal. A: Gen., 176(2), 201 (1999)
Hattori H, Chem. Rev., 95(3), 537 (1995)
Davis RJ, Doskocil EJ, Bordawekar S, Catal. Today, 62(2-3), 241 (2000)
Lee SS, Lee SC, Kim JC, Korean J. Chem. Eng., 19(3), 406 (2002)
Yuan XD, Park JN, Wang J, Lee CW, Park SE, Korean J. Chem. Eng., 19(4), 607 (2002)
Zaidi HA, Pant KK, Korean J. Chem. Eng., 22(3), 353 (2005)
Kim JC, Li HX, Chen CY, Davis ME, Microporous Mater., 2, 413 (1994)
