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Received September 4, 2008
Accepted September 24, 2008
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Direct preparation of dichloropropanol from glycerol and hydrochloric acid gas in a solvent-free batch reactor: Effect of experimental conditions
Sun Ho Song
Sang Hee Lee
Dong Ryul Park
Heesoo Kim
Sung Yul Woo1
Won Seob Song1
Myong Suk Kwon1
In Kyu Song†
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea 1Samsung Fine Chemicals Corporation, Nam-gu, Ulsan 680-090, Korea
inksong@snu.ac.kr
Korean Journal of Chemical Engineering, March 2009, 26(2), 382-386(5), 10.1007/s11814-009-0064-3
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Abstract
Solvent-free direct preparation of dichloropropanol (DCP) from glycerol and hydrochloric acid gas was carried out in a batch reactor with a variation of reaction conditions (agitation speed, reaction time, reaction temperature, and reaction pressure), amount of H3PW12O40 catalyst, and amount of water absorbent (silica gel blue). The reaction was conducted at high agitation speed in order to avoid mass transfer limitation between glycerol and hydrochloric acid gas. In the direct preparation of DCP from glycerol and hydrochloric acid gas, DCP formation was increased with_x000D_
increasing reaction time, reaction temperature, and reaction pressure. Chlorination of glycerol occurred via the following consecutive reaction steps: glycerol→monochloropropanediol (MCPD)→dichloropropanol (DCP)→trichloropropane (TCP). Reaction rate decreased in the order of first-step reaction>second-step reaction>third-step reaction. The presence of H3PW12O40 catalyst and water absorbent (silica gel blue) enhanced the formation of DCP. DCP formation was increased with increasing the amount of H3PW12O40 catalyst and water absorbent (silica gel blue). Strong Bronsted acid site of H3PW12O40 catalyst and water removal from the reaction system favorably served in improving DCP formation.
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Song IK, Barteau MA, J. Mol. Catal. A-Chem., 212(1-2), 229 (2004)
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Hill CL, Prosser-McCartha CM, Coord. Chem. Rev., 143, 407 (1995)
Okuhara T, Mizuno N, Misono M, Adv. Catal., 41, 113 (1996)
