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Investigating the properties and performance of 3A molecular sieves as an adsorbent to prevent coke formation in olefin dehydration process
International Journal of Chemical Reactor Engineering ( IF 1.6 ) Pub Date : 2021-12-20 , DOI: 10.1515/ijcre-2021-0179
Zoya Moslempour 1, 2 , Sepehr Sadighi 3 , Ali Dashti 1, 2 , Ali Ahmadpour 1
Affiliation  

Abstract To study the affinity of 3A aluminosilicate adsorbents to prevent oligomerization of olefin molecules and forming green oil, physical and chemical properties of 3A molecular sieves are measured by using characterization techniques such as temperature-programmed desorption (TPD), nitrogen (N2) and water adsorptions, X-ray diffraction (XRD), X-ray fluorescence (XRF), crushing strength, and carbon dioxide (CO2) adsorption. Moreover, coke formation affinities of the understudy adsorbents are evaluated in a bench-scale system using 1-butene and 1,3-butadiene at temperatures of 220 and 260 °C, and outcomes are validated against the actual data gathered from an industrial scale olefin dehydration plant. Results confirm that the type of binder and the amount of ion exchange affect the performance of a 3A molecular sieve nominated for dehydrating olefinic streams. The binder with the least amount of acidity is preferred, and at least 35% of Na ions of the 4A zeolite should be exchanged with K ions to make it applicable for synthesizing an appropriate 3A molecular sieve. Furthermore, to control the oligomerization and inhibit green oil formation, the CO2 adsorption and acidity of Trisiv shape molecular sieves with the sizes of 1/4 inch should be less than 0.5 wt % and 1.7 mmol NH3/g, respectively. For extrudate shape with the sizes of 1/16 inch CO2 adsorption and acidity should be less than 0.2 wt % and 2.2 mmol NH3/g, respectively.

中文翻译:

研究 3A 分子筛作为吸附剂防止烯烃脱水过程中结焦的性质和性能

摘要 为研究 3A 铝硅酸盐吸附剂对烯烃分子低聚和生成绿油的亲和力,采用程序升温脱附 (TPD)、氮气 (N2) 和水等表征技术测量了 3A 分子筛的理化性质。吸附、X 射线衍射 (XRD)、X 射线荧光 (XRF)、压碎强度和二氧化碳 (CO2) 吸附。此外,在 220 和 260 °C 温度下使用 1-丁烯和 1,3-丁二烯在实验室规模系统中评估研究吸附剂的焦炭形成亲和力,并根据从工业规模烯烃收集的实际数据验证结果脱水厂。结果证实,粘合剂的类型和离子交换量会影响指定用于烯烃流脱水的 3A 分子筛的性能。优选酸度最少的粘合剂,4A沸石中至少有35%的Na离子与K离子交换,才能适用于合成合适的3A分子筛。此外,为了控制低聚反应和抑制绿油形成,尺寸为 1/4 英寸的 Trisiv 形状分子筛的 CO2 吸附和酸度应分别小于 0.5 wt% 和 1.7 mmol NH3/g。对于尺寸为 1/16 英寸的挤出物形状,CO2 吸附和酸度应分别小于 0.2 wt% 和 2.2 mmol NH3/g。4A分子筛的Na离子至少有35%与K离子交换,才能适用于合成合适的3A分子筛。此外,为了控制低聚反应和抑制绿油形成,尺寸为 1/4 英寸的 Trisiv 形状分子筛的 CO2 吸附和酸度应分别小于 0.5 wt% 和 1.7 mmol NH3/g。对于尺寸为 1/16 英寸的挤出物形状,CO2 吸附和酸度应分别小于 0.2 wt% 和 2.2 mmol NH3/g。4A分子筛的Na离子至少有35%与K离子交换,才能适用于合成合适的3A分子筛。此外,为了控制低聚反应和抑制绿油形成,尺寸为 1/4 英寸的 Trisiv 形状分子筛的 CO2 吸附和酸度应分别小于 0.5 wt% 和 1.7 mmol NH3/g。对于尺寸为 1/16 英寸的挤出物形状,CO2 吸附和酸度应分别小于 0.2 wt% 和 2.2 mmol NH3/g。分别。对于尺寸为 1/16 英寸的挤出物形状,CO2 吸附和酸度应分别小于 0.2 wt% 和 2.2 mmol NH3/g。分别。对于尺寸为 1/16 英寸的挤出物形状,CO2 吸附和酸度应分别小于 0.2 wt% 和 2.2 mmol NH3/g。
更新日期:2021-12-20
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