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.