Process for preparing patina

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

Inactive Publication Date: 2009-12-09
TONGJI UNIV
View PDF3 Cites 2 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for preparing patina
  • Process for preparing patina
  • 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 added respectively 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

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. The specific steps are as follows: build a reaction device, use ascorbic acid aqueous solution with a molar concentration of 2.5×10-4 to 7.5×10-4 mol / L as a solvent, and FeSO4 as a solute to prepare a ferrous solution, and place it in a four-necked flask under a nitrogen atmosphere; Place the alkaline solution in one tube of the constant pressure titration funnel, and place the Fe2(SO4)3 solution in another tube of the constant pressure titration funnel; the molar concentrations of FeSO4 and Fe2(SO4)3 solutions are equal; Using magnetic stirring, the solution in the four-necked flask is stirred evenly, the pH value of the solution in the four-necked flask is adjusted to 6, Fe2(SO4)3 solution is added dropwise, and the alkaline solution is added dropwise at the same time, so that the pH value of the solution is maintained at 6; after the Fe2(SO4)3 solution is dripped, record the pH value of the solution, continue to drop the alkaline solution in the solution, and observe the color change of the solution at the same time, until the pH value of the solution is 7, the reaction ends; aging, that is get the desired product. The green rust prepared by the invention has high purity and mild reaction conditions.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
Inventor 黄民宋芳罗婕吴俊庄楚冬李佟茗
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap