Improved Hydrogen Separation Using Hybrid Membrane Composed of Nanodiamonds and P84 Copolyimide.

Alexandra Pulyalina,Galina Polotskaya,Valeriia Rostovtseva,Alexander Toikka,Zbynek Pientka

doi:10.3390/polym10080828

Alexandra Pulyalina, Galina Polotskaya + Show 3 more

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https://doi.org/10.3390/polym10080828

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Abstract

Membrane gas separation is a prospective technology for hydrogen separation from various refinery and petrochemical process streams. To improve efficiency of gas separation, a novel hybrid membrane consisting of nanodiamonds and P84 copolyimide is developed. The particularities of the hybrid membrane structure, physicochemical, and gas transport properties were studied by comparison with that of pure P84 membrane. The gas permeability of H2, CO2, and CH4 through the hybrid membrane is lower than through the unmodified membrane, whereas ideal selectivity in separation of H2/CO2, H2/CH4, and CO2/CH4 gas pairs is higher for the hybrid membrane. Correlation analysis of diffusion and solubility coefficients confirms the reliability of the gas permeability results. The position of P84/ND membrane is among the most selective membranes on the Robeson diagram for H2/CH4 gas pair.

Highlights

Membrane technologies provide a number of advantages in terms of environmental requirements, high energy efficiency, and low capital and operating cost over their conventional counterpart technologies [1]
Tomethod reveal of specific features preparation of the hybrid present in the membrane is guaranteed by the the composite and membrane, subsequent comparative research of P84/ND
A novel hybrid membrane was obtained by dispersing ND particles in a matrix of P84 copolyimide and was characterized by high selectivity in separation of hydrogen from gases formed during steam reforming of methane: H2, CO2, and CH4

Summary

Introduction

Membrane technologies provide a number of advantages in terms of environmental requirements, high energy efficiency, and low capital and operating cost over their conventional counterpart technologies [1]. Membrane gas separation has been successfully developed and is widely used in chemical and petrochemical plants. Separation of hydrogen from its mixtures with nitrogen or hydrocarbons, nitrogen purification, and carbon dioxide removal from natural gas are recognized as the most significant industrial applications of membranes [2]. Hydrogen separation and purification is among the global problems; hydrogen is considered to be the most promising source of alternative energy that could replace fossil fuel. Hydrogen is commonly produced by steam methane reforming [4]: CH4 + H2 O ↔ CO + 3H2 Fuel, since the only product of its combustion is water, which does not damage the environment [3].

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