Effects of FAU Zeolites on the Crystallization of Chloronitrobenzenes above the Eutectic Composition

Authors: Jeeranun Neaungjumnong, Sasikarn Yairit, Sudarat Pattanapaiboonkul, Pramoch Rangsunvigit, Santi Kulprathipanja

Abstract:

Crystallization has been used for the separation of chloronitrobenzene or CNBs, which are isomeric substances (o-, mand p-CNB) and important intermediates in chemical productions. Effects of feed composition on the crystallization of m- and p-CNB was first studied. The results conform to the binary phase diagram of m- and p-CNB. After that, effects of FAU zeolites (NaX, CaX, BaX, NaY and CaY) above the eutectic composition (63.5 and 65.0 wt% m-CNB in the feed) was also investigated. The results showed that the FAU zeolites significantly affected the precipitates, the composition of which was shifted from being rich in m-CNB to rich in p-CNB. Effects of the number of FAU zeolites on the precipitate composition was then studied. The results revealed that the precipitates from the lower number of the zeolites had higher p-CNB purity than those from the higher number of zeolite.

Keywords: Chloronitrobenzenes, crystallization, separation, eutectic

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1059457

References:

[1] W. Priegnitz, "Process for the separation of ortho-chloronitrobenzene," United States Patent 4 240 986 to UOP Inc, 1980.
[2] R. Demuth, B.M. Konig, T. Linn, and H.J. Raat, H.M. Weber, E. Zirngiebl, and R. Leiberich, "Continuous adiabatic process for preparing nitrochlorobenzene," United States Patent, 0 161 269 to Bayer Corporation, 2002.
[3] L. Roberto, "Separation by crystallization in presence of water," U.S. Patent, 3 816 551 to Monsanto Company, 1974.
[4] J.W. Mullin, Crystallization. Oxford: Butterworth-Heinemann, 2001.
[5] "Fractional crystallization," Documenst, Sulzer Chemtech Ltd., http://www. sulzerchemtech.com/en/PortalData/11/Resources/Brochures/MTT/ Fractional_Crystallization-e.pdf.
[6] K. Funakoshi, H. Takiyama, and M. Matsuoka, "Influences of seed crystals on the agglomeration phenomena product purity of mchloronitrobenzene crystals in bath crystallization," Chemical Engineering Journal, vol. 81, pp 307-313, 2001.