MEMBRANE AND METHOD FOR THE SEPARATION OF AROMATIC HYDROCARBONS FROM A MIXTURE OF VARIOUS AROMATIC HYDROCARBONS OR FROM A MIXTURE OF SUCH AROMATIC HYDROCARBONS AND NON-AROMATIC HYDROCARBONS

摘要

The invention relates to membranes and to a method for the separation of aromatic hydrocarbons from a mixture of various aromatic hydrocarbons or from a mixture of such aromatic hydrocarbons and non-aromatic hydrocarbons. According to the invention the membrane is formed from aromatic polyesters on the basis of aromatic diacid chlorides in combination with either bisphenol-A-like bisphenols, or a bisphenol which is completely built up of aromatic centres. Preferably the membrane is formed from aromatic polyesters on the basis of aromatic diacid chlorides such as terephthaloyl chloride, isophthaloyl chloride, 5-t-butyliso-phthaloyl chloride, or PIDA in combination with bisphenol-A-like bisphenols, such as 4X-BPN, 4X-BPT, 4X-BPI.