填料塔中亚硝酸甲酯再生过程模拟_李文龙.pdf

66 3 2015 3 CIESC Journal Vol.66 No.3 March 2015 300072 MN MN NO/O2 ?4.39% O2 MN MN MN MN MN MN MN N2 MN MN MN NO DOI 10.11949/j.issn.0438-1157TQ 018 A 0438 1157 2015 03 0979 08 Simulation of methyl nitrite regeneration in packed column LI Wenlong, WANG Weihan, LI Zhenhua, MA Xinbin (Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China) Abstract: The process of methyl nitrite (MN) regeneration is a key step in scale-up of synthesis of alkyl esters. To maximize the real atom economy of the process, CO coupling reaction and MN regeneration need to be optimized and proceed at the same reaction rate. Studies on the process and kinetics of MN regeneration are reported. But few mathematical models for MN regeneration in a packed column are available. By analyzing the important reactions of MN regeneration, a mathematic model of MN regeneration in a packed column was developed with the reported kinetic parameters. The effect of main reaction parameters on MN yield was studied. The simulation results showed that MN yield increased with increasing liquid velocity and NO/O2 mole ratio but decreased with increasing temperature, gas velocity and N2 volume fraction. The simulation results were verified by experiments under different conditions, which proved that this model could be used for the design and operation of MN regeneration. Furthermore, the simulation results at two different mixing modes of NO and O2 were presented. Key words: methyl nitrite; packed column; mathematical modeling; regeneration; absorption 2014-08-26 2014-12-15 1989 2006BAE02B03 Received date: 2014-08-26. Corresponding author: Prof. MA Xinbin, xbma@tju.edu.cn Foundation item: supported by the National Key Project for the 11th Five Year Plan (2006BAE02B03). 980 66 ()( ) [1] CO CO oxalate DMO methyl nitrite CO MN dimethyl 2CO ? 2CH3ONO ???(COOCH3)2 ? 2NO (1) 2CH3OH ? 0.5O2 ? 2NO ??? 2CH3ONO ? H2O (2) 2CO ? 2CH3OH