Composite carbon molecular sieve membranes having anti-substructure collapse particles loaded in a core thereof

• Main Authors: KOSURI MADHAVA R, MA CANGHAI, KRATZER DEAN W
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2018
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

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 ofa 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 pyrolysisstep 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. 种碳分子筛(CMS)膜通过以下方式制备：热解中空纤维膜至峰值热解温度T，该中空纤维膜具有围绕聚合物芯的聚合物皮，存在于该聚合物芯中形成的孔中的抗子结构坍塌颗粒有助于防止热解前该中空纤维膜中形成的孔的坍塌。这些抗子结构坍塌颗粒由种或多种材料制成，该种或多种材料：i)具有高于T的玻璃化转变温度T，ii)具有高于T的熔点，或ii)在低于T的温度下在所述热解步骤期间完全热分解。这些抗子结构坍塌颗粒不溶于用于溶解该芯的聚合物材料的溶剂中。