Patent ID: 11944940
Assignee: LG CHEM, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A method for manufacturing a water-treatment membrane, comprising:
bringing an aqueous solution including free chlorine and one or a combination of sodium bromide, potassium bromide, calcium bromide, magnesium bromide, ammonium bromide, lithium bromide, germanium bromide, cobalt bromide, strontium bromide, cesium bromide, tungsten bromide, copper(II) bromide, barium bromide or hydrogen bromide to yield a bromine ion into contact with a polyamide active layer on a porous polysulfone support for a contact time of from 15 seconds to 30 seconds, wherein an amount of the free chlorine is from 150 ppm to 400 ppm and an amount of the bromine ion is from 150 ppm to 400 ppm based on the aqueous solution;
wherein the water-treatment membrane has a bromine element content of greater than 0 at % and less than or equal to 5 at %, a chlorine element content of greater than 0 at % and less than or equal to 1 at %, and a ratio of the bromine element to the chlorine element (Br/Cl) is from 5:1 to 10:1 when measured using an electron spectroscopy for chemical analysis (ESCA) elemental analysis on a surface of the water-treatment membrane using X-ray photoelectron spectroscopy.