Composite semipermeable membrane, spiral wound separation membrane element, and method for producing the same

A method for producing a composite semipermeable membrane, comprising:

• a step of contacting an amine solution containing a polyfunctional amine component and an organic solution containing a polyfunctional acid halide component on a porous support to form a skin layer containing the polyamide resin on the surface of the porous support,
• wherein the contact is carried out in the presence of at least one substance having a solubility parameter of 8 to 14 (cal/cm3)1/2, selected from ethanol, propanol, butanol, butyl alcohol, 1-pentanol, 2-pentanol, t-amyl alcohol, isoamyl alcohol, isobutyl alcohol, isopropyl alcohol, undecanol, 2-ethylbutanol, 2-ethylhexanol, octanol, cyclohexanol, tetrahydrofurfuryl alcohol, t-butanol, benzyl alcohol, 4-methyl-2-pentanol, 3-methyl-2-butanol, pentyl alcohol, allyl alcohol, anisole, ethyl isoamyl ether, ethyl-t-butyl ether, ethyl benzyl ether, crown ether, cresyl methyl ether, diisoamyl ether, diisopropyl ether, diglycidyl ether, cineol, diphenyl ether, dibutyl ether, dipropyl ether, dibenzyl ether, dimethyl ether, tetrahydropyran, trioxane, dichloroethyl ether, butyl phenyl ether, furan, monodichlorodiethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether and diethylene chlorohydrin, and
• a step of applying warm water passing treatment to the skin layer after forming the skin layer on the surface of the porous support.

A method for producing a spiral wound separation membrane element, comprising:

• a step of contacting an amine solution containing a polyfunctional amine component and an organic solution containing a polyfunctional acid halide component on a porous support to form a skin layer containing a polyamide resin on the surface of the porous support, thereby to prepare a composite semipermeable membrane,
• wherein the contact is carried out in the presence of at least one substance having a solubility parameter of 8 to 14 (cal/cm3)1/2, selected from ethanol, propanol, butanol, butyl alcohol, 1-pentanol, 2-pentanol, t-amyl alcohol, isoamyl alcohol, isobutyl alcohol, isopropyl alcohol, undecanol, 2-ethylbutanol, 2-ethylhexanol, octanol, cyclohexanol, tetrahydrofurfuryl alcohol, t-butanol, benzyl alcohol, 4-methyl-2-pentanol, 3-methyl-2-butanol, pentyl alcohol, allyl alcohol, anisole, ethyl isoamyl ether, ethyl-t-butyl ether, ethyl benzyl ether, crown ether, cresyl methyl ether, diisoamyl ether, diisopropyl ether, diglycidyl ether, cineol, diphenyl ether, dibutyl ether, dipropyl ether, dibenzyl ether, dimethyl ether, tetrahydropyran, trioxane, dichloroethyl ether, butyl phenyl ether, furan, monodichlorodiethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether and diethylene chlorohydrin,
• a step of processing the composite semipermeable membrane into a spiral shape,and
• a step of applying warm water passing treatment to the skin layer after processing the composite semipermeable membrane into a spiral shape.