Conversion of methanol to aromatics in fluidized bed reactor
Conversion of methanol to aromatics in fluidized bed reactor
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流化床反应器中甲醇转化为芳烃
DOI：
10.1016/j.cattod.2014.02.007
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发表时间：
2014-09-15
期刊：
影响因子：
5.3
通讯作者：
Wei, Fei
中科院分区：
文献类型：
--
作者：
Wang, Tong;Tang, Xiaoping;Wei, Fei
在单段和两段沸腾床(SSFB)和两段沸腾床(TSFB)中，研究了新鲜或废弃的ZSM-5催化剂上甲醇转化为芳烃(MTA)的反应。在250℃、275℃、300℃、325℃、350℃、380℃和475℃的温度范围内连续采样，最终确定了甲醇生成二甲醚、C-1-C-4烃、C5+非芳烃生成芳烃的连续反应模式。在较宽的温度范围内，对二甲苯(PX)在二甲苯中的质量比很高，这表明PX是MTA的初级产物，其他二甲苯是由PX的电离聚体产生的。对二甲苯的脱烷基化、烷基化或歧化反应最终生成苯、甲苯和三甲苯等其他芳香族化合物。采用TSFB反应器与使用SSFB反应器相比，由于抑制了气体的返混，有效地提高了芳烃收率。在甲醇空速较高的情况下，将TSFB与高活性强酸催化剂相结合，可获得较高的芳烃收率。(C)2014爱思唯尔B.V.保留所有权利。
Conversion of methanol to aromatics (MTA) was conducted over a fresh or a spent Zn/ZSM-5 catalyst in single stage fluidized bed (SSFB) and two stage fluidized bed (TSFB). Sampling at different stages of TSFB and operation in the temperature range of 250, 275, 300, 325, 350, 380 and 475 degrees C revealed the consecutive reaction mode from methanol to DME, C-1-C-4 hydrocarbons, C5+ nonaromatics to aromatics finally. High weight ratio of para-xylene (PX) in xylene in wide temperature range suggested that PX was the primary product of MTA, and other xylenes are produced by the iosmerization of PX. Other aromatics such as benzene, toluene and trimethylbenzene are finally produced by the dealkylation, alkylation or disproportionation of xylene. The adoption of TSFB reactor was effective to increase the yield of aromatics, compared to that using SSFB, due to the inhibition of backmixing of gases. Combination of TSFB and highly active catalyst with strong acids was effective to get high yield of aromatics under high space velocity of methanol. (C) 2014 Elsevier B.V. All rights reserved.