Title:
DISSOLUTION AND REMOVAL COMPOSITION AND CLEANING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/110687
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a dissolution and removal composition capable of dissolving and removing scale while suppressing corrosion of a base material even in a state in which oxygen remains; and a cleaning method. This dissolution and removal composition contains a main agent that dissolves and removes scale containing a metal oxide, a first reducing agent that is an organic acid having oxygen reduction properties, and at least one type of second reducing agent selected from among a thiourea-based compound, a thiourea dioxide-based compound, a thioglycolic acid salt and a dithionous acid salt. In addition, the dissolution and removal composition preferably further contains at least one type of inhibitor selected from among sulfur-containing compounds having any one of a mercaptan group (-HS), a thiocyanic acid group (-SCN) and an alkali metal salt of a mercaptan group (NaS-, KS- or LiS-).
Inventors:
NOGUCHI YOSHINORI (JP)
WADA TAKAYUKI (JP)
SHIMBO YOICHI (JP)
UEDA ATSUYOSHI (JP)
HATTORI SEIYA (JP)
WADA TAKAYUKI (JP)
SHIMBO YOICHI (JP)
UEDA ATSUYOSHI (JP)
HATTORI SEIYA (JP)
Application Number:
PCT/JP2019/044146
Publication Date:
June 04, 2020
Filing Date:
November 11, 2019
Export Citation:
Assignee:
MITSUBISHI HITACHI POWER SYS (JP)
KYOEISHA CHEMICAL CO LTD (JP)
KYOEISHA CHEMICAL CO LTD (JP)
International Classes:
C23G1/08; C23F11/16; C23G1/06
Foreign References:
| JPS493832A | 1974-01-14 | |||
| JP2017203087A | 2017-11-16 | |||
| JP2016183370A | 2016-10-20 | |||
| JP2015105412A | 2015-06-08 |
Attorney, Agent or Firm:
FUJITA, Takaharu (JP)
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