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Process for preparing patina

A green rust and solution technology, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve problems such as research difficulties, increased operating costs, and product yields that need to be improved, and achieve high purity and mild reaction conditions. Effect

Inactive Publication Date: 2008-09-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-precipitation method requires strict control of oxygen in actual operation to achieve anaerobic operation, which brings difficulties to research and increases operating costs
In addition, there are needles in the co-precipitation synthesis product, and the product yield needs to be improved.

Method used

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  • Process for preparing patina
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  • Process for preparing patina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: With 2.5×10 -4 mol / L ascorbic acid (Vc) aqueous solution as solvent, FeSO 4 and Fe 2 (SO 4 ) 3 The concentration is 0.03M.

[0030] a, set up the reaction device, the first port of the four-necked flask 10 is connected with two connecting pipes 4, and the top of the two connecting pipes 4 is respectively connected with constant pressure titration funnel 1, and Fe is added respectively in the two constant pressure titration funnels 1 2 (SO 4 ) 3 Solution 2 and NaOH solution 3, the upper port of the constant pressure titration funnel 1 is plugged tightly with a rubber stopper to prevent air from entering; the second port in the four-neck flask is connected to the calomel electrode 5 and the nitrogen inlet tube 6 respectively, and the third port The port is connected to the pH electrode 7, the fourth port is respectively connected to the counter electrode 8 and the working electrode 9, and the four-necked flask 10 is placed on the electromagnetic stirrer 1...

Embodiment 2

[0038] Example 2: with 5.0×10 -4 mol / L ascorbic acid (Vc) aqueous solution as solvent, FeSO 4 and Fe 2 (SO 4 ) 3 The concentration is 0.05M.

[0039] a, set up the reaction device, the first port of the four-necked flask 10 is connected with two connecting pipes 4, and the top of the two connecting pipes 4 is respectively connected with constant pressure titration funnel 1, and Fe is respectively added in the two constant pressure titration funnels 1 2 (SO 4 ) 3Solution 2 and NaOH solution 3, the upper port of the constant pressure titration funnel 1 is plugged tightly with a rubber stopper to prevent air from entering; the second port in the four-neck flask is connected to the calomel electrode 5 and the nitrogen inlet tube 6 respectively, and the third port The port is connected to the pH electrode 7, the fourth port is respectively connected to the counter electrode 8 and the working electrode 9, and the four-necked flask 10 is placed on the electromagnetic stirrer 11...

Embodiment 3

[0052] Example 3: With 7.5×10 -4 mol / L ascorbic acid (Vc) aqueous solution as solvent, FeSO 4 and Fe 2 (SO 4 ) 3 The concentration is 0.07M as an example:

[0053] a, set up the reaction device, the first port of the four-necked flask 10 is connected with two connecting pipes 4, and the top of the two connecting pipes 4 is respectively connected with constant pressure titration funnel 1, and Fe is added respectively in the two constant pressure titration funnels 1 2 (SO 4 ) 3 Solution 2 and NaOH solution 3, the upper port of the constant pressure titration funnel 1 is plugged tightly with a rubber stopper to prevent air from entering; the second port in the four-neck flask is connected to the calomel electrode 5 and the nitrogen inlet tube 6 respectively, and the third port The port is connected to the pH electrode 7, the fourth port is respectively connected to the counter electrode 8 and the working electrode 9, and the four-necked flask 10 is placed on the electromagn...

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Abstract

The invention belongs to the inorganic chemical technical field, in particular to a preparation method of important intermediate, namely green rust which is obtained in the process of generating various ferrites. The specific steps are as follows: a reaction device is built, and the ferrous solution is prepared by taking the ascorbic acid aqueous solution the mol concentration of which is 2.5x10<-4> to 7.5x10<-4>mol / l as the solvent and FeSO4 as the solute and is put in a four-mouth flask in nitrogen atmosphere; the alkaline solution is put in a pipe of a constant pressure titration funnel, and the Fe2(SO4)3 solution is put in the other pipe of the constant pressure titration funnel; the FeSO4 solution and the Fe2(SO4)3 solution are the same in mol concentration; the solution in the four-mouth flask are evenly stirred by the magnetic stirring until the PH value of the solution in the four-mouth flask is adjusted to 6, and the Fe2(SO4)3 solution is dropwise added and simultaneously the alkaline solution is dropwise added, which keeps the PH value of the solution to 6; after the Fe2(SO4)3 solution is completely added, the PH value of the solution is recorded, and the alkaline solution continues to be dropwise added, simultaneously the color change of the solution is observed, and the reaction is over until the PH value of the solution is 7; and the needed products are obtained after aging. The green rust prepared by the invention is high in purity, and the reaction conditions needed in the invention are mild.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of green rust, an important intermediate produced in various ferrite production processes. Background technique [0002] At present, green rust is an important intermediate product, and the research on its formation can not only provide theoretical guidance for the preparation of nano-scale ferrite, but also have application value in metal corrosion, environmental engineering and other related fields. In recent years, researchers have begun to synthesize green rust as the final product, and the commonly used processes are oxidation and co-precipitation. [0003] The oxidation method is to precipitate Fe(II) under anaerobic conditions to form Fe(OH) 2 suspension, and then partially oxidized to produce green rust. Although the principle of oxidation method to prepare green rust is simple, it is difficult to control the oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 黄民宋芳罗婕吴俊庄楚冬李佟茗
Owner TONGJI UNIV
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