再生气中乙烯含量和再生次数对3A分子筛吸附性能和使用寿命的影响
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摘要
采用模拟工业应用的小型并列固定床装置和模拟MTO中脱甲烷塔塔顶的物料作为再生气,系统研究了含乙烯质量分数0.0%～4.0%的再生气在不同再生次数条件下对3A分子筛物理和吸附性能的影响。研究发现:3A分子筛的动态水吸附性能随再生气中乙烯含量的增加而明显下降,适宜的再生气含乙烯质量分数在0.0%～1.5%,再生气含乙烯质量分数低于1.5%时的动态水吸附性能下降幅度可控制在15%以内;动态水吸附性能下降最主要的原因是晶体表面积炭行为所引起晶间孔的堵塞,尤其是晶间介孔(3～50nm)的积炭堵塞。
By using a small parallel fixed bed device for simulating industrial application and the gas that similar with the outgas from the demethanate tower in MTO unit as regenerated gas,the effects of regeneration gas containing 0.0% ～ 4.0% ethylene on the physical and adsorption properties of 3A zeolite under different regeneration times were studied systematically. It was found that the dynamic water adsorption performance of 3A zeolite decreased obviously with the increase of ethylene content in the regenerated gas. The appropriate ethylene content was 0.0% ～ 1.5%,and the decrease of corresponding dynamic water adsorption capacity was less than 15%. The main reason for the decrease of dynamic water adsorption performance is the blockage of intergranular pores caused by the behavior of carbon deposition on the crystal surface,especially the blockage of intergranular mesopores( 3～50nm).
By using a small parallel fixed bed device for simulating industrial application and the gas that similar with the outgas from the demethanate tower in MTO unit as regenerated gas,the effects of regeneration gas containing 0.0% ～ 4.0% ethylene on the physical and adsorption properties of 3A zeolite under different regeneration times were studied systematically. It was found that the dynamic water adsorption performance of 3A zeolite decreased obviously with the increase of ethylene content in the regenerated gas. The appropriate ethylene content was 0.0% ～ 1.5%,and the decrease of corresponding dynamic water adsorption capacity was less than 15%. The main reason for the decrease of dynamic water adsorption performance is the blockage of intergranular pores caused by the behavior of carbon deposition on the crystal surface,especially the blockage of intergranular mesopores( 3～50nm).
引文
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[3]张阳,王蕾,李明,等.世界及国内乙烯产能概况[J].当代化工,2018(1):113-115.
[4]马颖足.脱乙烷塔冻塔原因分析与预防措施[J].化学工程与装备,2018(4):208-210.
[5]唐明辉,赵丹丹.神华包头煤化工烯烃分离工艺技术特点[J].石油和化工设备,2011(4):48-50.
[6]刘建荣.煤制烯烃项目烯烃分离装置工艺流程优化研究[J].中国石油石化,2016(21):103-105.
[7]谢文奇.乙烯装置干燥系统的工艺改造[J].辽宁化工,1998(3):146-148.
[8]高耸.乙烯装置与干气回收联合的再生系统探讨[J].乙烯工业,2012(3):15-18.
[9]赵良,程广伟,高文刚,等.甲醇制烯烃下游烯烃分离技术的简介、对比及发展方向[J].河南科技,2013(16):25-26.
[10]张少石,陈晓蓉,梅华,等.MTO脱甲烷塔分离过程模拟及优化[J].化工进展,2014(5):1093-1100.
[11]李建隆,娄晓燕,刘颖,等.MTO产品分离工艺的模拟与优化[J].计算机与应用化学,2013(5):527-530.
[12]张丽平,王梅.优化脱甲烷塔操作降低乙烯损失[J].山西化工,2012(3):65-66.
[13]许普,刘新元,王涛,等.抚顺乙烯装置脱甲烷塔改造[J].乙烯工业,2006(1):41-42.
[14]徐如人,庞文琴,霍启升,等.分子筛与多孔材料化学[M].2版.北京:科学出版社,2015:133.
[15]SILVA J A C,MATA V G,DIAS MM,et al.Effect of coke in the equilibrium and kinetics of sorption on 5A molecular sieve zeolites[J].Industrial&Engineering Chemistry Research,2000(4):665-668.
[16]郭春垒,方向晨,贾立明,等.分子筛催化剂积炭失活行为探讨[J].工业催化,2011(12):15-20.
[17]CHEN I,CHEN F L.Effect of alkali and alkaline-earth metals on the resistivity to coke formation and sintering of nickelalumina catalyts[J].Industrial&Engineering Chemistry Research,1990(4):534-539.
[18]周裕之,肖立明.“拟原位”法测定积炭催化剂有效扩散系数[J].化学反应工程与工艺,1993(3):319-325.