	US 11,685,667 B2
	Method for purifying ferric chloride
Ying Che, Huizhou (CN); Kaijing He, Huizhou (CN); Jinhua Liang, Huizhou (CN); Maojie Liang, Huizhou (CN); and Haixiong Chen, Huizhou (CN)
Assigned to 3R ENVIRONMENTAL TECHNOLOGY CO., LTD., Huizhou (CN); and TANGSHAN 3R CHEMICAL CO., LTD., Tangshan (CN)
Filed by 3R Environmental Technology Co., Ltd., Huizhou (CN); and Tangshan 3R Chemical Co., Ltd., Tangshan (CN)
Filed on Jun. 24, 2021, as Appl. No. 17/357,944.
Claims priority of application No. 202011590582.5 (CN), filed on Dec. 29, 2020.
Prior Publication US 2022/0204358 A1, Jun. 30, 2022
Int. Cl. C01G 49/00 (2006.01); C01G 49/10 (2006.01)

CPC C01G 49/10 (2013.01) [C01G 49/0009 (2013.01); C01P 2006/80 (2013.01)]

9 Claims

1. A method, comprising:

1) adding an oxidant to an aqueous solution of an iron-containing chloride for oxidation of Fe²⁺, to yield a ferric chloride solution;

2) adding industrial hydrochloric acid and butyl acetate to the ferric chloride solution, shaking and resting a mixture of the ferric chloride solution, the industrial hydrochloric acid, and butyl acetate for phase separation, to yield an organic phase and an aqueous phase;

3) adding a stripping agent to the organic phase, shaking, and resting a mixture of the stripping agent and the organic phase; and collecting an aqueous phase comprising ferric chloride; and

4) evaporating and concentrating the aqueous phase comprising ferric chloride, removing butyl acetate, to yield purified ferric chloride.