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題名 | 轉烷化反應中乙苯生成反應途徑探討=Investigate on the Formation Path of Ethylbenzne in the Transalkylation Reaction System |
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作者 | 蕭秀雄; 賴維新; 林進明; | 書刊名 | 石油季刊 |
卷期 | 49:3 2013.09[民102.09] |
頁次 | 頁127-135 |
分類號 | 457.5 |
關鍵詞 | 轉烷化; 甲基乙基苯; 乙苯生成; Transalkylation; Methylethylbenzene; Ethylbenzene formation; |
語文 | 中文(Chinese) |
中文摘要 | 實驗數據顯示,以純甲苯或純九碳芳香烴為進料,不同觸媒的反應出料中乙苯含量均很低,混合二甲苯中乙苯含量低於0.6 wt%;但是苯加九碳芳香烴為進料的減苯轉烷化實驗數據顯示,不同觸媒的反應出料中乙苯含量差異頗大,其混合二甲苯中乙苯含量從1.0 wt%至9.5 wt%不等,相差頗大。由此論證轉烷化反應中甲基乙基苯,除了文獻所見的,斷乙基產生甲苯與乙烷之反應外,甲基乙基苯也會與苯反應產生乙苯,而且此反應是乙苯生成的最大宗,比文獻上所提及乙苯生成途徑更顯著。催化甲基乙基苯斷乙基產生甲苯與乙烷反應能力強的觸媒,除了其出料中乙苯產率較低之外,甲基乙基苯轉化率較高且二甲苯與甲苯產率也較高。因應苯市況差的情況,如果摻煉苯轉烷化反應所產混合二甲苯含許多乙苯,不但會影響生產對二甲苯的吸附分離操作,且乙苯於脫烷基型異構化觸媒反應中又被轉化成苯,有違減苯操作目的。建議轉烷化觸媒的性能規範加入乙苯產率限制,不但提升二甲苯品質與產率,而且也提高甲基乙基苯之轉化率以降低其於系統內迴流量。尤其遇需要減苯時機時,符合乙苯產率限制的觸媒將更能展現其優越性。 |
英文摘要 | The experimental data indicated that ethylbenzene content in the reaction product were low, less than 0.6 wt% of mixed xylenes, for different catalysts if pure toluene or pure C9 aromatics was reactant. However, ethylbenzene content for different catalysts varied considerably, in the range from 1.0 wt% to 9.5 wt% of mixed xylenes, if benzene and C9 aromatics were reactants. This has demonstrated that methyl ethylbenzene, in addition to being converted into toluene and ethane as in the general literature findings, will be reacted with benzene to produce ethylbenzene, and this ethylbenzene formation reaction is much significant than other previous reactions. The catalyst with stronger abilities to convert methyl ethylbenzene into toluene and ethane, in addition to forming less ethylbenzene, showed higher conversion of methyl ethylbenzene and higher yield of xylenes and toluene.In response to poor market conditions of benzene, the higher content of ethylbenzene in the mixed xylenes produced from the transalkylation reaction with blending benzene will not only affect the operation of the adsorptive separation of xylene, but the ethylbenzene will also be converted into benzene again under dealkylation isomerization catalyst in the isomeration unit, contrary to the purpose of less benzene produced operation.It is recommended that the ethylbenzene yield upper limit should be added as one of items in catalyst performance specification. The catalysts which meet the ethylbenzene yield limit will enhance the xylenes yield and methyl ethyl benzene conversion which in turn will decrease the interal reflux of methyl ethyl benzene in the system. Especially in case of producing xylenes with less benzene, the catalysts which meet the ethylbenzene yield limit will be able to demonstrate their superiority. |
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