COUNTERCURRENT DUAL-FLOW SPIRAL-WOUND DUAL-PIPE MEMBRANE SEPARATION DEVICE

摘要

The present invention relates to an improved design for a spiral-wound membrane separation device. The improved module (50) has one feed pipe (51A) separated into compartments (A, B) which are connected axially to a porous spacer (55) surrounded by a membrane envelope (54). A separate permeate pipe (51B) is immediately adjacent and generally in a parallel configuration to the fluid feed pipe (51A) and is in fluid communication with a different porous spacer sheet (58). When the porous feed membrane (54) are combined using appropriate complementary shaped spaced filling means (52A, 52B), a spiral-wound membrane separation device is obtained having two centrally located pipes. In one aspect, the membrane separation module (50) further includes means for the addition of a countercurrent or cocurrent sweep fluid (gas) permeate.