Microporous Coordination Polymers for Efficient Recovery of Chloromethane from Organic Silicon Industrial Exhaust Gas

Removal and recovery of methyl chloride (CH₃Cl) from exhaust gas of organic silicon industry is highly important from the perspective of environment and economy. For the first time, a tailor-made microporous coordination polymer (Mn-BDC-TPA) was synthesized and applied to the efficient capture and recovery of CH₃Cl from related gas mixtures. The high adsorption capacity of CH₃Cl (163.4 cm³/g) and high adsorption selectivity of CH₃Cl over other impurity gases (1965 for N₂, 65 for CH₄, and 16 for C₂H₆) were achieved at 298 K and 100 kPa due to the dual-cage pore system and larger polarizability of CH₃Cl. Dynamic breakthrough experiments demonstrate the excellent CH₃Cl recovery performance (capacity of >98 cm³/g and purity of >95%) in one adsorption-desorption cycle from the CH₃Cl-involved binary, ternary, or quaternary gas mixture.