Separation of Methane from Shuttle Tanker Vents Gases by Adsorption on a Polyurethane/Zeolite Membrane

Shuttle tankers are becoming more widely used in deep water installations as a means of transporting crude oil to storage plants and refineries. The emissions of hydrocarbon vapours arise mainly during loading and offloading operations. Experiments have been carried out on the use of polyurethane/zeolite membrane on an alumina support for the separation of methane from carbon dioxide and oxygen. The physical properties of the membrane were investigated by FTIR. Single gas permeation tests with methane, propane, oxygen and carbon dioxide at a temperature of 293 K and pressure ranging from 0.1 to 1.0 x 10-5 Pa were carried out. The molar flux of the gases through the membrane was in the range of 3 x 10-2 to 1 x 10-1 molm-2s-1. The highest separation factor of CH4/CO2 and CH4/O2 and CH4/C3H8 was determined to be 1.7, 1.7 and 1.6 respectively.

A Theoretical Study on Molar Flux in the Capillary

The paper is concerned with the molar flux of oxygen in the capillary blood when oxygen diffuses from blood to tissue fluid at the middle section of the capillary bed where blood pressure and osmotic pressure of blood are equal. The result shows that the molar flux decreases exponentially with the radius of the capillary. Moreover, it is found that the molar flux increases linearly with the increasing of radial diffusion of oxygen. doi: 10.3329/jbas.v32i2.2429 Journal of Bangladesh Academy of Sciences Vol.32(2) 2008 226-233