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Dialysis solution regeneration method

A dialysate and permeate technology, applied in dialysis systems, chemical instruments and methods, semi-permeable membrane separation, etc. The effect of fewer problems and cost reduction

Pending Publication Date: 2021-11-30
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, since the dialysate used in artificial dialysis contains wastes such as urea that migrates from the blood, the dialysate is usually discarded after being used once.
Although there are devices that treat tap water and convert it into dialysate, it is difficult to purify tap water into dialysate in areas with poor tap water quality.
In addition, in areas where the supply of tap water is intermittent, it is difficult to handle the amount of tap water required for home dialysis, so it is necessary to store a large amount of dialysate for home dialysis.
In addition, during a disaster, if the water supply continues to be cut off, it will be impossible to make dialysate from tap water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0139] The reverse osmosis membrane element manufactured using the separation membrane A was fed with the raw water B at a pressure of 2.0 MPa, and operated so that the recovery rate became 60%. The obtained concentrate was passed through a reverse osmosis membrane element produced using the separation membrane A, and operated so that the recovery rate became 50%. The recovery rate as a reverse osmosis membrane system is 80%. The urea removal rate was calculated from the obtained permeate and found to be 82%.

Embodiment 2

[0141] With respect to the reverse osmosis membrane element manufactured using the separation membrane A, the raw water B was passed in at a pressure of 1.5 MPa, and it operated so that the recovery rate might become 60%. The obtained concentrated liquid was passed through the reverse osmosis membrane element produced using the separation membrane A, and it operated so that the recovery rate might become 50%. The recovery rate as a reverse osmosis membrane system is 80%. The urea removal rate was calculated from the obtained permeate and found to be 77%.

Embodiment 3

[0143] In the reverse osmosis membrane element produced using the separation membrane B, the raw water B was passed through at a pressure of 2.0 MPa, and the recovery rate was 60%. The obtained concentrate was passed through a reverse osmosis membrane element produced using the separation membrane B, and operated so that the recovery rate became 50%. The recovery rate as a reverse osmosis membrane system is 80%. When the urea removal rate was calculated from the obtained permeate, it was 69%.

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Abstract

The present invention provides a dialysis solution regeneration method that exhibits high urea elimination performance even under a low-pressure operation and that can be simply used even at home. This dialysis solution regeneration method is a method for reducing urea concentration in an aqueous solution containing urea, and comprises a reverse osmosis step of using a reverse osmosis membrane element to obtain, from the aqueous solution containing the urea at an operation pressure of between 0.5 MPa and 2.0 MPa inclusive, a concentrated solution having a higher urea concentration and a permeate solution having a lower urea concentration. The aqueous solution containing the urea has a urea concentration of 0.5 g / L or higher, the reverse osmosis membrane element has a reverse osmosis membrane, and the reverse osmosis membrane has a pore diameter of 7.0 angstrom or less as measured using positron annihilation lifetime spectroscopy.

Description

technical field [0001] The present invention relates to a dialysate regeneration method, more specifically, to a method for separating and recovering wastes such as urea toxin contained in the dialysate, and regenerating it as dialysate again. Background technique [0002] In recent years, dialysis patients are increasing all over the world, and from the viewpoint of the quality of life of dialysis patients, the demand for home dialysis is remarkably expanding. [0003] In normal manual dialysis, it is necessary to use a large amount of dialysate of about 90 L to about 150 L for a single treatment, although it depends on body weight and the like. On the other hand, since the dialysate used in artificial dialysis contains waste such as urea that migrates from the blood, the dialysate is usually discarded after being used once. Although there are devices for treating tap water to convert it into dialysate, it is difficult to purify tap water into dialysate in areas with poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M1/16
CPCA61M1/1696C02F1/441B01D61/025B01D69/02B01D2317/025B01D2325/08B01D2325/06C02F2101/38C02F2103/026C02F2301/08B01D2311/2521B01D2325/02831B01D61/026B01D69/107B01D71/56B01D2311/2623C02F1/42
Inventor 小川久美子志村晴季花田茂久
Owner TORAY IND INC