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Manufacturing method of reverse osmosis membrane

A manufacturing method and technology of reverse osmosis membrane, applied in the direction of reverse osmosis, separation method, semi-permeable membrane separation, etc., can solve the problem that it is difficult to take into account the improvement of rejection rate and the increase of permeation rate

Active Publication Date: 2020-11-24
KITAGAWA INDS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For porous carbon membranes as such ultrafiltration membranes, in principle, it is difficult to achieve both the improvement of the rejection rate and the improvement of the permeation rate.

Method used

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  • Manufacturing method of reverse osmosis membrane
  • Manufacturing method of reverse osmosis membrane
  • Manufacturing method of reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] (porous support substrate)

[0122] An ultrafiltration membrane (trade name "GR40PP", manufactured by Alfa Laval Co., Ltd.) was prepared as a porous support substrate. The porous support substrate includes a resin nonwoven backing layer and a polysulfone (PSF) porous plastic layer laminated on one surface of the backing layer.

[0123] (coating film forming process)

[0124] By dripping a polyvinylpyrrolidone (PVP) solution (10% by mass) on the porous plastic layer and spreading the solution uniformly with a bar coater, a layer containing polyvinylpyrrolidone (PVP) is formed on the surface of the porous support substrate. A PVP coating film (coating film) of a vinylpyrrolidone (PVP) solution (10% by mass). Then, it was allowed to stand at room temperature for 10 hours to dry the PVP coating film on the porous support substrate, thereby obtaining a porous support substrate with a PVP coating film.

[0125] In addition, as PVP in the PVP solution, PVP powder (trade nam...

Embodiment 2

[0142] A reverse osmosis membrane in which a carbon membrane was formed on a porous support substrate was obtained in the same manner as in Example 1 except for the carbon membrane formation step. The film-forming conditions of the carbon film in Example 2 are as follows.

[0143]

[0144] ·Film forming device: batch type carbon film forming device

[0145] Duty cycle: 25%

[0146] ·Frequency: 1.5kHz

[0147] ·Duty cycle: 180μs

[0148] · Process gas (ratio): Ar (48%), N 2 (48%), CH 4 (4%)

[0149] Target material: high-purity graphite (purity: 99.999%)

[0150] ·Peak power density: 2.91Wcm -2

[0151] Power density: 0.23Wcm -2

[0152] ·Film forming pressure: 0.64Pa

[0153] ·Film forming time: 315 seconds

Embodiment 3

[0155] A reverse osmosis membrane in which a carbon membrane was formed on a porous support substrate was obtained in the same manner as in Example 1 except for the carbon membrane formation step. The film-forming conditions of the carbon film in Example 3 are as follows.

[0156]

[0157] ·Film forming device: batch type carbon film forming device

[0158] Duty cycle: 25%

[0159] ·Frequency: 1.5kHz

[0160] ·Duty cycle: 180μs

[0161] · Process gas (ratio): Ar (48%), N 2 (48%), CH 4 (4%)

[0162] Target material: high-purity graphite (purity: 99.999%)

[0163] ·Peak power density: 2.91Wcm -2

[0164] Power density: 0.23Wcm -2

[0165] ·Film forming pressure: 0.64Pa

[0166] ·Film forming time: 262 seconds

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Abstract

The method for producing the reverse osmosis membrane 1 of the present invention includes a coating film forming step of forming a coating film soluble in a predetermined solvent on the surface of a porous support substrate 2 that is insoluble in the solvent. A carbon film forming step of forming a carbon film 3 on the coating film by physical vapor deposition using carbon as a target under a nitrogen atmosphere, and after forming the carbon film 3, coating the coating film with the solvent Dissolution and removal process for film dissolution and removal.

Description

technical field [0001] The invention relates to a method for manufacturing a reverse osmosis membrane. Background technique [0002] Attempts have been made to use porous carbon membranes as active layers in filtration membranes. Compared with polymer films such as polyamide-based films that have been the mainstream of the active layer in the past, porous carbon films are superior in durability and the like, and are expected to be put into practical use in recent years. [0003] For example, Patent Document 1 discloses that a porous carbon film formed by plasma CVD (Chemical Vapor Deposition) using a hydrocarbon gas such as acetylene as a carbon source is used as an active layer. This porous carbon membrane has a plurality of pores of about several nm penetrating in the thickness direction. For example, in a filtration experiment using an aqueous solution of sodium chloride, the rejection rate of sodium chloride (concentration: 34mM) was 68.5%. The passing speed (flux) is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D61/02B01D69/10B01D69/12
CPCB01D67/0072B01D61/025B01D71/021B01D69/1071B01D69/107B01D69/1213B01D69/1216B01D53/228B01D2323/286B01D2323/219B01D2325/40
Inventor 北野宏树山口晃生远藤守信霍苏埃·奥尔蒂斯·梅迪纳
Owner KITAGAWA INDS