Gas-Phase Catalytic Hydrochlorination of Acetylene in a Two-Stage Fluidized-Bed Reactor

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• 作者：Xiaobo Wei ; Haibo Shi ; Weizhong Qian ; Guohua Luo ; Yong Jin ; Fei Wei
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：January 7, 2009
• 年：2009
• 卷：48
• 期：1
• 页码：128-133
• 全文大小：140K
• 年卷期：v.48,no.1(January 7, 2009)
• ISSN：1520-5045

文摘

Production of vinyl chloride monomer (VCM) by the hydrochlorination of acetylene with HCl was investigated in both a single-stage fluidized bed (SSFB) and a two-stage fluidized bed (TSFB) at different reaction temperatures and space velocities of acetylene. The conversion of acetylene increases with increasing temperature and decreases with increasing space velocity. Over a wide range of operating conditions, a higher conversion of acetylene was achieved in the TSFB than in the SSFB, with the selectivity of VCM being almost 100%. This process can be described by a two-dimensional dispersion and reaction model. A new catalyst, HgCl₂ supported on a coconut-shell-type activated carbon, which has a much higher mechanical strength than the industrial catalyst (HgCl₂ supported on a coal-based activated carbon), was employed in the fluidized beds. Evaluation of the catalyst lifetime in a fast sublimation experiment at high temperature showed that the new catalyst has a longer lifetime than the industrial catalyst. The novel TSFB technology, combined with the new catalyst, is effective in providing a higher throughput and quality of the VCM product than the conventional PB reactor.