Molecular sieves mediated unsaturated hydrocarbon separation and related compositions, materials, methods and systems

A sieved hydrocarbon mixture obtained by separating an eight-membered monocyclic unsaturated hydrocarbon from a hydrocarbon mixture further comprising additional nonlinear unsaturated C8H2m hydrocarbons with 4≤m≤8,

• wherein separating the eight-membered monocyclic unsaturated hydrocarbon comprises
• providing a 10-ring pore molecular sieve having a sieving channel with a 10-ring sieving aperture with a minimum crystallographic free diameter greater than 3 Å and a ratio of the maximum crystallographic free diameter to the minimum crystallographic free diameter between 1 and 2,
• the 10-ring pore molecular sieve having a T1/T2 ratio≥20:1 wherein T1 is an element independently selected from Si and Ge or a combination thereof, and T2 is an element independently selected from Al, B and Ga or a combination thereof,
• the 10-ring pore molecular sieve further having a counterion selected from NH4+, Li+, Na+, K+ and Ca++ or a combination thereof, and
• contacting the hydrocarbon mixture with the 10-ring pore molecular sieve at a temperature of −20° C. to 60° C. for a time and under conditions to obtain a sieved hydrocarbon mixture comprising the eight-membered monocyclic unsaturated hydrocarbon at a separation concentration Cs>Ci,
• wherein the 10-ring pore molecular sieve has a framework type selected from group consisting of MEL, TUN, IMF, MFI, OBW, MFS and TER, and
• wherein, the sieved hydrocarbon mixture comprises the eight-membered monocyclic unsaturated hydrocarbon at a separation concentration Cs≥99.3% wt.