Method for efficiently preparing ferrate based on nascent interfacial activity

Patent metadata

Field	Value
Publication number	US-11198619-B2
Application number	US-201916250435-A
Country	US
Kind code	B2
Filing date	Jan 17, 2019
Priority date	Jan 22, 2014
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A method for efficiently preparing ferrate based on nascent state interfacial activity. The method is as follows: (a) preparing nascent iron solution; (b) adding an oxidizing agent to the iron solution of step (a); (c) adding alkali solution or alkali particles to the mixed solution of step (b), mixing by stirring, and carrying out solid-liquid separation; (d) adding a stabilizing agent to the liquid separated out in step (c), and thus obtaining ferrate solution. The yield is 78-98%. The prepared ferrate solution is stable and can be stored for 3-15 days.

First claim

What is claimed is:

1. A high efficiency preparation method for ferrate based on activity in nascent state interface, characterized in that, the high efficiency preparation method for ferrate based on activity in nascent state interface comprises the steps of:
(a) adding solid iron salt to a first alkaline solution with a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L;
(b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from step (a), adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20 and mixing the oxidizing agent with the iron solution in nascent state to obtain a mixture;
(c) under 5° C.-60° C., adding 5-100 mL second alkaline solution or 0.2˜70 g alkaline granules to the mixture from the step (b), wherein the second alkaline solution has a concentration of 0.1˜16 mol/L; then stirring and mixing for 0.1˜30 min to form an intermediate solution; after the intermediate solution turns purplish black color completely, processing solid-liquid separation by centrifugation or filtration to obtain a liquid; and
(d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid from the step (c) and the stabilizing agent to obtain a ferrate solution, where a molar ratio of an equivalent concentration or iron in the liquid from the step (c) to the stabilizing agent is 1:0.1-10.

2. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1 , characterized in that, in the step (a), the iron salt is one or more of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride.

3. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1 , characterized in that, in the step (a), the first alkaline solution is one or more of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution.

4. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1 , characterized in that, in the step (b), the oxidizing agent is one or more of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone.

5. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1 , characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

6. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1 , characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

7. A high efficiency preparation method for ferrate based on activity in nascent state interface, characterized in that, the high efficiency preparation method for ferrate based on activity in nascent state interface comprises the steps of:
(a) adding solid iron salt to a first alkaline solution with a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L;
(b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from the step (a), adding 5˜100 mL second alkaline solution or 0.2˜70 g alkaline granules to the iron solution in nascent state, wherein with the second alkaline solution has a concentration of 0.1˜16 mol/L; stirring to mix and obtaining a mixture;
(c) under 5° C.-60° C., adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20 to the mixture obtained from the step (b), stirring and mixing for 0.1˜30 min to form an intermediate solution; after the intermediate solution turns purplish black color completely, processing solid-liquid separation by centrifugation or filtration to obtain a liquid; and
(d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the stabilizing agent to obtain a ferrate solution, wherein a molar ratio of an equivalent concentration of iron in the liquid from the step (c) to the stabilizing agent is 1:0.1-10.

8. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 7 , characterized in that,
in the step (a), the iron salt is one or more of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride;
in the step (a), the first alkaline solution is one or more of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution;
in the step (b), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; in the step (b), the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution;
in the step (c), the oxidizing agent is one or more of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone;
in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

9. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 2 , characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

10. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 2 , characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

11. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 3 , characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

Assignees

• Harbin Inst Technology

Inventors

• Ma Jun
• Liu Yulei
• Wang Lu
• Liu Qingliang
• Zhao Xiaodan

Classifications

• C01G49/0081 Primary

  containing iron in unusual valence state [IV, V, VI] · CPC title

• C01G49/0027 Primary

  containing one alkali metal · CPC title

• C01G49/0036

  containing one alkaline earth metal, magnesium or lead · CPC title