Composite hollow fiber membrane for separation of carbon dioxide/methane in the biogas purification process, membrane module comprising the same and manufacturing method thereof

摘要

The present invention provides a composite hollow fiber membrane for separating carbon dioxide and methane, which is coated with organopolysiloxane copolymers wherein repeating units including polyethylene glycol or polyethylene/propylene glycol are grafted on the surface of the hollow fiber membrane composed of glassy polymers; and a membrane module comprising the same. Also the present invention provides a method for manufacturing the composite hollow fiber membrane, comprising the steps of: acquiring a polymer solution by dissolving glassy polymers in an organic solvent; acquiring a homogeneous spinning solution by mixing the polymer solution with an additive and stirring the solution; providing a hollow fiber membrane by spinning the spinning solution via a dual spinneret; and coating an organopolysiloxane copolymer solution wherein repeating units including polyethylene glycol or polyethylene/propylene glycol are grafted on the surface of the hollow fiber membrane. The composite hollow fiber membrane manufactured according to the present invention can selectively separate and remove carbon dioxide from the mixed gas of carbon dioxide and methane in a biogas purification process and can improve the efficiency of the separation process because the trasmissivity of carbon dioxide is increased greatly.