公开(公告)号：EP4159303A1

公开(公告)日：2023-04-05

申请号：EP21812490.7

申请日：2021-05-28

申请人： Toray Industries, Inc.

发明人： YOSHIZAKI, Tomoya ,  SOYA, Takanori ,  KOIWA, Masakazu ,  HANADA, Shigehisa

IPC分类号： B01D61/02 ,  B01D69/02 ,  B01D69/10 ,  B01D69/12 ,  B01D71/56 ,  C01G51/00 ,  C01G53/00 ,  C22B23/00 ,  C22B26/10 ,  C22B3/06 ,  C22B3/22

摘要： The present invention relates to a method for separating and recovering a cobalt salt and a nickel salt, the method including a separation step for separating a cobalt salt and a nickel salt from a rare metal-containing aqueous solution that contains at least a cobalt salt and a nickel salt as rare metals by means of a nanofiltration membrane. The nanofiltration membrane is such that the glucose permeability is at least 3 times the sucrose permeability, the sucrose permeability is 10% or less and the isopropyl alcohol permeability is 50% or more, when a 1000 mg/L aqueous glucose solution having a pH of 6.5, a 1000 mg/L aqueous sucrose solution, and a 1000 mg/L aqueous solution of isopropyl alcohol are passed through the filter at an operating pressure of 0.5 MPa and a temperature of 25°C.

公开(公告)号：EP4442352A1

公开(公告)日：2024-10-09

申请号：EP21966303.6

申请日：2021-11-30

申请人： Toray Industries, Inc.

发明人： YOSHIDOMI, Shinichiro ,  NAGANO, Izumi ,  MIYAMOTO, Ryoma ,  OKAMOTO, Yoshiki ,  SHIMURA, Harutoki ,  HANADA, Shigehisa

IPC分类号： B01D61/02 ,  B01D61/26 ,  B01D61/32 ,  B01D61/58 ,  A61M1/16

CPC分类号： B01D61/58 ,  A61M1/1656 ,  B01D61/02 ,  B01D61/32 ,  A61M1/16

摘要： An object of the present invention is to provide a solution treatment method which is to be applied to a solution containing at least an electrolyte in an amount of 1000 mg/L or more and containing a low-molecular-weight nonelectrolyte molecule having a molecular weight of 70 or less, and by which the electrolyte and water are recovered while the low-molecular-weight nonelectrolyte molecule is removed, with combination of a plurality of types of membranes. The present invention provides a solution treatment method comprising treating a raw liquid with a separation membrane 1 and a separation membrane 2 which each separate a feed liquid into a permeate liquid and a concentrated liquid, and separating the raw liquid into a purified liquid containing water and an electrolyte and a discharge liquid containing a low-molecular-weight nonelectrolyte molecule, wherein
the raw liquid is a solution containing at least an electrolyte in an amount of 1000 mg/L or more and containing a low-molecular-weight nonelectrolyte molecule having a molecular weight of 70 or less,
a permeate liquid from the separation membrane 1 is fed to the separation membrane 2 and subjected to separation treatment,
the separation membrane 1 exhibits, when a solution 1 with pH 7 in which 10000 mg/L of sodium chloride (NaCl) and 250 mg/L of urea are mixed is fed thereto at 36°C and a pressure of 1.2 Mpa, an NaCl removal rate of 90% or more, the NaCl removal rate being defined by a reduction rate of a component concentration in a permeated solution relative to a component concentration in a feed liquid,
the separation membrane 2 exhibits, when a solution 2 with pH 7 in which 1000 mg/L of sodium chloride (NaCl) and 700 mg/L of urea are mixed is fed thereto at 36°C and a pressure of 1.8 Mpa, a urea removal rate of 85% or more, the urea removal rate being defined by a reduction rate of a component concentration in a permeated solution relative to on a component concentration in a feed liquid,
a difference between a urea removal rate of the separation membrane 2 under the evaluation conditions of the separation membrane 2 specified above and a urea removal rate of the separation membrane 1 under the evaluation conditions of the separation membrane 1 specified above is 40% point or more, and
the solution treatment method satisfies any one of the following requirements (i) and (ii):
(i) a part of a permeate liquid from the separation membrane 2 is mixed with the raw liquid and then fed to the separation membrane 1, and a whole or a part of the remainder of the permeate liquid from the separation membrane 2 is mixed with a concentrated liquid from the separation membrane 1 to afford the purified liquid; and
(ii) a whole of a permeate liquid from the separation membrane 2 is mixed with the raw liquid and then fed to the separation membrane 1 to afford a concentrated liquid from the separation membrane 1 as the purified liquid.

公开(公告)号：EP4141135A1

公开(公告)日：2023-03-01

申请号：EP21792873.8

申请日：2021-04-21

申请人： Toray Industries, Inc.

发明人： YOSHIZAKI, Tomoya ,  SOYA, Takanori ,  KOIWA, Masakazu ,  HANADA, Shigehisa

IPC分类号： C22B26/12 ,  B01D61/02 ,  B01D61/58 ,  B01D69/02 ,  B01D69/10 ,  B01D69/12 ,  B01D71/56 ,  C22B3/06 ,  C22B3/22 ,  C22B7/00 ,  C22B7/04 ,  C22B23/00 ,  C22B47/00 ,  H01M10/54

摘要： The present invention pertains to a method for recovering a rare metal salt, the method comprising: an acid treatment step for obtaining a rare metal-containing acidic aqueous solution by putting a material containing monovalent and polyvalent rare metals in contact with an acid aqueous solution; a separation step for obtaining permeated water containing the monovalent rare metal and non-permeated water containing the polyvalent rare metal from the rare metal-containing acidic aqueous solution by using a nanofiltration membrane satisfying a specific condition (1); and a concentration step for obtaining non-permeated water having a higher concentration of the monovalent rare metal and permeated water having a lower concentration than the permeated water in the separation step, by using a reverse osmosis membrane.