	US 12,351,775 B2
	Neutralizing instrument reprocessing
Wendy Lo, Saint Paul, MN (US); Michael S. Rischmiller, Saint Paul, MN (US); and Erik C. Olson, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on May 13, 2022, as Appl. No. 17/663,246.
Claims priority of provisional application 63/262,888, filed on Oct. 22, 2021.
Claims priority of provisional application 63/201,817, filed on May 14, 2021.
Prior Publication US 2022/0364018 A1, Nov. 17, 2022
Int. Cl. C11D 1/72 (2006.01); A01N 37/36 (2006.01); A01P 1/00 (2006.01); C11D 3/20 (2006.01); C11D 11/00 (2006.01); C11D 17/00 (2006.01); C23C 22/48 (2006.01); C23G 1/02 (2006.01)

CPC C11D 1/72 (2013.01) [A01N 37/36 (2013.01); A01P 1/00 (2021.08); C11D 3/2086 (2013.01); C11D 17/0008 (2013.01); C23C 22/48 (2013.01); C23G 1/02 (2013.01); C11D 2111/16 (2024.01)]

9 Claims

1. A neutralizer, destainer, and passivating composition comprising:

from about 40 wt-% to 75 wt-% of citric acid and an additional weak acid having a pKa greater than about 2.5, wherein the additional weak acid comprises from about 0.001 wt-% to 10 wt-%;

an alcohol alkoxylated nonionic surfactant according to the formula: R¹—O—(EO)_x(PO)_y-Π wherein R is a straight-chain C₁₀-C₁₆alkyl, and wherein x is from 4 to 8, and wherein y is from 2 to 5; and

water.