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Composite carbon molecular sieve membranes having anti-substructure collapse particles loaded in a core thereof
inventor/creator:Dean W Kratzer, Madhava R Kosuri, MA Canghai
Paten number/application number:US 14/827,064
application/authorized announcemen date:2015/8/14
brief introduction:

A carbon molecular sieve (CMS) membrane is made by pyrolyzing, to a peak pyrolysis temperature TP, a hollow fiber membrane having a polymeric sheath surrounding a polymeric core, anti-substructure collapse particles present in pores formed in the polymeric core help prevent collapse of pores formed in the hollow fiber membrane before pyrolysis. The anti-substructure collapse particles are made of a material or materials that either: i) have a glass transition temperature TG higher than TP, ii) have a melting point higher than TP, or ii) are completely thermally decomposed during said pyrolysis step at a temperature less than TP. The anti-substructure collapse particles are not soluble in a solvent used for dissolution of the polymeric material of the core.