GAS SEPARATION MEMBRANE ELEMENT, GAS SEPARATION MEMBRANE MODULE, AND GAS SEPARATION DEVICE

To provide a gas separation membrane element having excellent separation performance even when high pressure gas is supplied, a gas separation membrane module, and a gas separation device.SOLUTION: A gas separation membrane element includes: a gas separation membrane including a first porous layer and a non-porous resin composition layer; a feeding-side space for feeding starting raw material gas to the gas separation membrane; a permeation-side space for permeated gas that has been permeated through the gas separation membrane; and a sealing unit for preventing the raw material gas and the permeated gas from mixing. If pressure [kPaG] in the supply-side space is increased from P1 to P2 and is then decreased to P3, degree of permeation [mol/(m2 s kPa)] of test gas at the pressures P1, P2 and P3 are respectively defined as F1 to F3, each of P1 and P3 is set to 500 kPaG and P2 is set to pressure at which F2/F1=2, the gas separation membrane element satisfies a relationship in formula (I). Formula (I): F3/F1≤2.0.SELECTED DRAWING: Figure 1 【課題】高圧なガスが供給された場合にも、優れた分離性能を有するガス分離膜エレメント、ガス分離膜モジュール、及びガス分離装置を提供する。【解決手段】ガス分離膜エレメントは、第１多孔層及び無孔質の樹脂組成物層を含むガス分離膜と、ガス分離膜に原料ガスを供給するための供給側空間と、ガス分離膜を透過した透過ガスのための透過側空間と、原料ガスと透過ガスとの混合を防止するための封止部とを含む。ガス分離膜エレメントは、供給側空間の圧力［ｋＰａＧ］を、Ｐ１からＰ２まで昇圧した後、Ｐ３に降圧したときの各圧力Ｐ１、Ｐ２及びＰ３における試験用ガスの透過度［ｍｏｌ／（ｍ２・ｓ・ｋＰａ）］をそれぞれＦ１〜Ｆ３とし、Ｐ１及びＰ３を５００ｋＰａＧとし、Ｐ２がＦ２／Ｆ１＝２となる圧力である場合に、式（Ｉ）の関係を満たす。Ｆ３／Ｆ１≦２．０ （Ｉ）【選択図】図１