Abstract
New hollow fiber gas separation membranes with a non-porous selective layer based on poly(4-methyl-1-pentene) (PMP) granules have been obtained using the solution-free melt spinning process. The influence of the preparation conditions on the geometry of the obtained samples was studied. It was found that a spin head temperature of 280 °C and a specific mass throughput of 103 g mm−2 h−1 are optimal to obtain defect-free, thin-walled hollow fibers in a stable melt spinning process, using the given spinneret geometry and a winding speed of 25 m/min. The gas permeability and separation properties of new fibers were studied using CO2/N2 and CO2/CH4 mixtures, and it was found that the level of gas selectivity characteristic of homogeneous polymer films can be achieved. The features of the gas mixture components permeability below and above the PMP glass transition temperature have been experimentally studied in the range of CO2 concentrations from 10 to 90% vol. The temperature dependences of the permeability of the CO2/CH4/N2 mixture through the obtained HF based on PMP have been investigated, and the values of the apparent activation energies of the permeability have been calculated, which make it possible to predict the properties of membrane modules based on the obtained membranes in a wide temperature range.
Highlights
The widespread use of membrane technology is limited by the low choice of polymers for production and industrial application because of high requirements towards permeability ratios and production technologies of mechanically strong films or fibers, durability, chemical resistance, affordable price of the raw materials and others [1].One of the most promising commercially available polymer materials for the membrane manufacture is poly(4-methyl-1-pentene) (PMP), a semicrystalline polymer with a glass transition temperature from 20 to 30 ◦ C and a degree of crystallinity of 20 to 80%.PMP has a high ratio of permeability/selectivity and good mechanical properties due to its bulky side chains’ high thermal stability, compared to other membrane polymers, and excellent chemical stability [2]
The influence of the conditions for obtaining hollow fibers (HFs) on the fiber’s geometry was investigated, and the values of gas permeability of samples of PMP HFs were obtained for various parameters of their preparation
A new set of hollow fiber gas separation membranes with a non-porous selective layer were obtained under various conditions using the melt spinning process as solventfree technology
Summary
One of the most promising commercially available polymer materials for the membrane manufacture is poly(4-methyl-1-pentene) (PMP), a semicrystalline polymer with a glass transition temperature from 20 to 30 ◦ C and a degree of crystallinity of 20 to 80%. PMP has a high ratio of permeability/selectivity and good mechanical properties due to its bulky side chains’ high thermal stability, compared to other membrane polymers, and excellent chemical stability [2]. The main feature of PMP is its insolubility in aliphatic and aromatic hydrocarbons, which are usually used as polymer solvents in the temperature range from 20 to 60 ◦ C, which makes it suitable for separating gas mixtures containing various hydrocarbons, while membranes from it can be obtained by melt technology [3]. PMP properties allow producing membranes, and hollow fiber membranes in particular, using non-solvent technology, which is important from the standpoint of an actual ecological approach
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
