Sorption and transport of CO sub 2 and CH sub 4 in chemically modified poly(phenylene oxide)

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6761014

Story, B J

The sorption and transport of CO{sub 2} and CH{sub 4} in poly(phenylene oxide) (PPO) and several of its derivatives are reported. Three modified PPO's were synthesized, containing carboxyl, methyl esterified carboxyl, and bromine substitutents. The carbonyl-containing derivatives, substituted at the methyl side chain site of the PPO backbone, were chosen to increase the CO{sub 2}/CH{sub 4} solubility selectivity of PPO. The brominated PPO, substituted at the phenylene ring position, was prepared in order to study the effect of substitution position on the permselective properties of the polymer. The permeability of CO{sub 2} in the methyl-substituted PPO series was less than half that of PPO, with overall selectivity increases ranging from 10-30%. The transport changes in these materials are attributed to decrease in polymer free volume and segmental motions. Brominated PPO showed a 150% increase in CO{sub 2} permeability, with no change in CO{sub 2}/CH{sub 4} selectivity. Mixed gas sorption measurements were made for the PPO/CO{sub 2}/CH{sub 4} and CPPO/CO{sub 2}/CH{sub 4} systems. Mixed gas sorption data in all cases were accurately predicted to within 5% by the dual mode sorption model, using parameters obtained from pure gas sorption data. Mixed gas permeability data for PPO showed that CO{sub 2} permeability in an equimolar CO{sub 2}/CH{sub 4} mixture was considerably lower than predicted by the simple competitive sorption model, while CH{sub 4} permeability in the mixture was significantly higher than the model prediction. The Petropoulos and competitive sorption/diffusion models for pure gas permeability were extended to include gas mixtures, and did not quantitatively predict the mixed gas permeability of either component.

• Research Organization: Texas Univ., Austin, TX (USA)
• OSTI ID: 6761014
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON DIOXIDE
DIFFUSION
SORPTION
METHANE
POLYMERS
PERMEABILITY
SORPTIVE PROPERTIES
BROMINATION
CHEMICAL PREPARATION
MATHEMATICAL MODELS
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
HALOGENATION
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SURFACE PROPERTIES
SYNTHESIS
030300* - Natural Gas- Drilling
Production
& Processing
360603 - Materials- Properties