Efficient separation of 1,3-butadiene from C4 hydrocarbons by flexible metal-organic framework with gate-opening effect
Lu Wang1,3, Hongliang Huang1,2*, Hejin Zhu1,3, Yanjiao Chang1,2, Xiangyu Guo1,2, Fan Yang1,2, Chongli Zhong1,2
1. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, P. R. China.
2. School of Chemical Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, P. R. China.
3. School of Textile Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, P. R. China.
*Corresponding authors:
Hongliang Huang Email:huanghongliang@tiangong.edu.cn.
Abstract:Efficient and economical separation of 1,3-butadiene (C4H6) from C4 hydrocarbons is imperative yet challenging in industrial separation processes. Herein, a guest-induced flexible Mn-bpdc MOF has been employed to separate C4H6 from C4hydrocarbons, including n-butene (n-C4H8), iso-butene (iso-C4H8), n-butane (n-C4H10) and iso-butane (iso-C4H10). Significantly, C4H6can instantaneously induce gate-opening of Mn-bpdc MOF at 0.13 bar and 298 K, thus significant amounts of C4H6 can be adsorbed, while other C4 hydrocarbons cannot induce the gate-opening even at 1 bar. The uptake selectivities of Mn-bpdc MOF for C4H6/n-C4H8and C4H6/iso-C4H8are up to 40.0 and 45.0 at 298 K and 1 bar, respectively, both surpassing all the reported adsorbents. In addition, breakthrough experiments verify that C4H6/n-C4H8, C4H6/iso-C4H8, C4H6/n-C4H10and C4H6/iso-C4H10mixture can be efficiently separated. More importantly, Mn-bpdc possesses excellent water stability and outstanding regeneration ability for C4H6 separation, making it a new benchmark for C4H6 purification.
Keywords: metal-organic frameworks, gate-opening, 1,3-butadiene, adsorption/gas, gas purification.