TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The gas or liquid comprises at least one volatile organic compound in an atmospheric gas. The gases or liquids comprise a mixture of hydrogen, nitrogen, methane and argon in an ammonia purge stream. The gases or liquids comprise hydrogen from a hydrocarbon vapor stream. The gases or liquids comprise a mixture of at least one pair of gases selected from nitrogen and oxygen, carbon dioxide and methane, and hydrogen and methane or a mixture of carbon monoxide, helium and methane. The gases or liquids comprise natural gas containing methane and at least one gas component selected from carbon dioxide, oxygen, nitrogen, water vapor, hydrogen sulfide, helium and other trace gases. The gases or liquids comprise hydrocarbon gases, carbon dioxide, and/or hydrogen sulfide. The gases or liquids comprise mixtures of olefins and paraffins. The gases or liquids comprise mixtures of isoparaffins and normal paraffins. The polybenzoxazole-based mixed matrix membrane further comprises a species selected from cobalt porphyrins, phthalocyanines and silver (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic compound is selected from alcohols, phenols, chlorinated hydrocarbons, pyridines and ketones. The liquid mixture comprises a mixture of sulfur compounds with gasoline or diesel fuels. The liquid mixture comprises a mixture selected from ethyl acetate-ethanol, diethyl ether-ethanol, acetic acid-ethanol, benzene-ethanol, chloroform-ethanol, chloroform-methanol, acetone-isopropyl ether, allyl alcohol-allyl ether, allyl alcohol-cyclohexane, butanol-butyl acetate, butanol-1-butylether, ethanol-ethyl butyl ether, propyl acetate-propanol, isopropyl ether-isopropanol, methanol-ethanol-isopropanol, and ethyl acetate-ethanol-acetic acid. EXAMPLE - An AIPO-14/poly(3,3',4,4'-benzophenonetetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane-3,3'-dihydroxy-4,4'-diamino-biphenyl) (poly(BTDA-APAF-HAB)) mixed matrix membrane containing 30 wt.% of dispersed AIPO-14 molecular sieve with thin plate morphology in the poly(BTDA-APAF-HAB)polyimide continuous matrix (AIPO-14/poly(BTDA-APAF-HAB)) was prepared as follows: 2.4 g of AIPO-14 molecular sieves were dispersed in a mixture of 14.0 g of NMP and 20.6 g of 1,3-dioxolane by mechanical stirring and ultrasonication for 1 hour to form slurry. Then 8.0 g of poly(BTDA-APAF-HAB)polyimide polymer was added to the slurry and the resulting mixture was stirred for 2 hours to form a stable casting dope containing 30 wt.% of dispersed AIPO-14 molecular sieves (weight ratio of AIPO-14 to poly(BTDA-APAF-HAB) was 30:100) in the continuous poly(BTDA-APAF-HAB)polymer matrix. The stable casting dope was allowed to degas overnight. An AIPO-14/poly(BTDA-APAF-HAB) mixed matrix membrane was prepared on a clean glass plate from the bubble free stable casting dope using a doctor knife with a 20-mil gap. The film together with the glass plate was then put into a vacuum oven. The solvents were removed by slowly increasing the vacuum and the temperature of the vacuum oven. The membrane was dried at 200 degrees C under vacuum for at least 48 hours to completely remove the residual solvents to form AIPO-14/poly(BTDA-APAF-HAB) mixed matrix membrane. The membrane was tested for CO2/CH4 separation under a testing temperatures of 50 degrees C. The membrane showed permeability for CO2 (P-CO2) of 58.1 Barrer and CO2/CH4 selectivity ( alpha -CO2/CH4) of 70.3.