公开(公告)号：US20210269700A1

公开(公告)日：2021-09-02

申请号：US17187542

申请日：2021-02-26

Applicant: KURARAY CO., LTD.

Inventor： Yasuhiro TAJIMA

IPC: C09K8/508 ,  C08F216/06

Abstract: Provided are a polyvinyl alcohol-based resin having an excellent plugging effect and a plugging agent for underground treatment. A polyvinyl alcohol-based resin is disclosed, in which a degree of swelling (%) when the polyvinyl alcohol-based resin is immersed in water at 40° C. for 30 minutes and a solubility (%) when the polyvinyl alcohol-based resin is immersed in water at 65° C. for 5 hours satisfy the degree of swelling/the solubility≥3.0.

公开(公告)号：US20180312237A1

公开(公告)日：2018-11-01

申请号：US15569565

申请日：2016-02-03

Applicant: Kuraray Co., Ltd.

Inventor： Yasuhiro TAJIMA

IPC: B63J4/00 ,  C02F1/00 ,  C02F1/50

CPC classification number: B63J4/002 ,  C02F1/50

Abstract: A ballast water treatment device includes a ballast tank, a main pipe, a circulation pipe, and a sterilizing component-introducing unit. The circulation pipe returns ballast water stored in the ballast tank to the main pipe. The main pipe guides ballast water to the ballast tank. The sterilizing component-introducing unit introduces a sterilizing component to a downstream side of a part of the main pipe connected with the circulation pipe. In a process of returning a part of ballast water stored in the ballast tank to the ballast tank via the circulation pipe and the main pipe, by pouring a sterilizing component from the sterilizing component-introducing unit, a sterilizing component can be added to the ballast water. Accordingly, the ballast water treatment device enables a sterilizing component concentration of ballast water to be increased.

公开(公告)号：US20180346088A1

公开(公告)日：2018-12-06

申请号：US15771478

申请日：2016-10-24

Applicant: Kuraray Co., Ltd.

Inventor： Yasuhiro TAJIMA

IPC: B63J4/00 ,  C02F1/00 ,  C02F1/50 ,  C02F1/76

CPC classification number: B63B13/00 ,  C02F1/50 ,  C02F1/76

Abstract: A ballast water treatment apparatus 1 comprises a ballast pipe 11 which guides ballast water to a ballast tank 60 and a sterilizing agent supply unit 30 which supplies a constant amount of a sterilizing agent per unit time to the ballast pipe 11 in accordance with a flow rate of ballast water flowing in the ballast pipe 11. A ballast water treatment method using the ballast water treatment apparatus 1 comprises steps of supplying ballast water to a ballast tank 60 via a ballast pipe 11 and supplying a constant amount of a sterilizing agent 33 per unit time to the ballast pipe 11 in accordance with a flow rate of the ballast water flowing in the ballast pipe 11.

公开(公告)号：US20180050290A1

公开(公告)日：2018-02-22

申请号：US15555226

申请日：2016-02-03

Applicant: KURARAY CO., LTD.

Inventor： Mitsuaki YAMAMOTO ,  Kazuaki HAGIWARA ,  Yasuhiro TAJIMA

IPC: B01D29/66 ,  B01D29/11 ,  B01D29/60 ,  C02F1/00 ,  B63J4/00

CPC classification number: B01D29/66 ,  B01D29/11 ,  B01D29/216 ,  B01D29/52 ,  B01D29/606 ,  B01D35/0273 ,  B01D35/12 ,  B01D65/02 ,  B01D2201/182 ,  B01D2201/54 ,  B63B13/00 ,  B63J4/002 ,  C02F1/00 ,  C02F1/004 ,  C02F2103/008 ,  C02F2201/005 ,  C02F2209/03 ,  C02F2303/16

Abstract: A ballast water production method is provided. The method includes a filtering step that passes raw water supplied into a housing through a filter from a primary side that is upstream of the filter to a secondary side that is downstream of the filter; a volume-increasing step after the filtering step that increases a volume of water present in a space on the secondary side of the housing while the supply of the raw water into the housing is stopped; a pressurizing step after the volume-increasing step that pressurizes an inside of the housing from the secondary side while the supply of the raw water into the housing is stopped; and a rinsing step after the pressurizing step that passes a fluid through the filter from the secondary side to the primary side while the supply of the raw water into the housing is stopped.