*Polymer-Based Membranes for C3+ Hydrocarbon Removal from Natural Gas DOI: http://dx.doi.org/10.5772/intechopen.103903*

**Table 9.** *C3+hydrocarbon*

 *properties in mixed matrix membranes.*

*3Multicomponent*

*4Multicomponent*

 *gas mixture: 0.5%C4H10/2%*

 *gas mixture: 1.5%C4H10/3%*

 *C*

 *C*

*H3 8/5% C2H6/77.9%% CH4/14% N2/500ppm BTEX.*

*H3 8/5% C*

*H2*

*6/66.5%% CH4/12% CO2/12% N2.*

#### **Figure 18.**

*Molecular structure of dual-functionalized POSS crosslinking agent (OS-POSS-VTMO) containing silicon hydride moiety (*☰*–Si–H) and trimethoxylsilicon groups –(Si(OMe)3).*

simulated typical field gas streams and testing conditions (e.g. feed pressure up to 800 psi for multicomponent gas mixture consisting C1-C5 hydrocarbons, CO2, N2 and BTEX). The produced novel, crosslinked Ter-PDMS/POSS MMMs exhibited better separation performance (e.g. 89% and 163% increase in C3H8/CH4 and C4H10/CH4 mixed gas selectivities) and enhanced swelling resistance, compared to conventional PDMS membrane. At 800 psi, Ter-PDMS/POSS MMM had a mixed gas C4H10 permeability of 4880 Barrer and C4H10/CH4 mixed gas selectivity of 18.7, respectively.
