MEMBRANES IN THE SEPARATION PROCESSES .7. ORGANIC-COMPOUNDS REMOVAL FROM THE AQUEOUS-SOLUTIONS

The removal of soluble organic compounds from the aqueous solutions is usually done by reverse osmosis. This paper presents the possibility of separating the low molecular weight solutes from various systems, u sing ultrafiltration membranes. The two considered dyes (foodstuff ora nge and dispersion dye) are separated by an ultrafiltration membrane o f polysulphone or polyamide, introducing in the separation system surf ace active agents of the alkyl pyrridinium, ammonium quaternary salts and alkyl-sulphate types. The presented separation process, i.e. collo idal ultrafiltration, operates under hydrodynamic conditions and usual operating pressures the process being economically much more efficien t than the reverse osmosis.