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A kind of preparation method of m-aminobenzenesulfonic acid

A technology of aminobenzenesulfonic acid and sodium nitrobenzenesulfonate, which is applied in the preparation of sulfonic acid, chemical instruments and methods, catalyst activation/preparation, etc. The effect of low production cost, reduced labor intensity and improved production efficiency

Active Publication Date: 2020-11-06
HEBEI JIANXIN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, continuous production cannot be realized, and mass production cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The catalyst of the present invention is a supported two-component metal catalyst, one of its active components is Pd or Pt, the other active component is Ag, and the carrier is nitrogen-containing activated carbon. The preparation method of described catalyst comprises the following steps,

[0029] (1) Take the aqueous solution of nitrogen-containing activated carbon and heat it to 80°C; the mass ratio of nitrogen-containing activated carbon to water is 1:4; the nitrogen-containing activated carbon has a nitrogen content of 0.15wt% and a particle size of 800 mesh, The specific surface area is 1200 m 2 / g, ash content 1wt%;

[0030] (2) Slowly add the corresponding Pd or Pt soluble metal compound solution dropwise to the loading amount of Pd or Pt according to the nitrogen-containing activated carbon in step (1), the Pd or Pt soluble metal compound solution is palladium nitrate, platinum nitrate , sodium chloropalladate, sodium chloroplatinate, chloropalladic acid or ...

Embodiment 2

[0035] The catalyst of the present invention is a supported two-component metal catalyst, one of its active components is Pd or Pt, the other active component is Ag, and the carrier is nitrogen-containing activated carbon. The preparation method of described catalyst comprises the following steps,

[0036] (1) Take the aqueous solution of nitrogen-containing activated carbon and heat it to 60°C; the mass ratio of nitrogen-containing activated carbon to water is 1:8; the nitrogen-containing activated carbon has a nitrogen content of 0.1wt% and a particle size of 80 mesh, The specific surface area is 400m 2 / g, ash content 0.5wt%;

[0037] (2) Slowly add the corresponding Pd or Pt soluble metal compound solution dropwise to the loading amount of Pd or Pt according to the nitrogen-containing activated carbon in step (1), the Pd or Pt soluble metal compound solution is palladium nitrate, platinum nitrate , sodium chloropalladate, sodium chloroplatinate, chloropalladic acid or ch...

Embodiment 3

[0042] The catalyst of the present invention is a supported two-component metal catalyst, one of its active components is Pd or Pt, the other active component is Ag, and the carrier is nitrogen-containing activated carbon. The preparation method of described catalyst comprises the following steps,

[0043] (1) Weigh the aqueous solution of nitrogen-containing activated carbon and heat it to 90°C; the mass ratio of nitrogen-containing activated carbon to water is 1:10; the nitrogen-containing activated carbon has a nitrogen content of 5wt%, a particle size of 1500 mesh, Surface area is 2000 m 2 / g, ash content 2wt%;

[0044] (2) Slowly add the corresponding Pd or Pt soluble metal compound solution dropwise to the loading amount of Pd or Pt according to the nitrogen-containing activated carbon in step (1), the Pd or Pt soluble metal compound solution is palladium nitrate, platinum nitrate , sodium chloropalladate, sodium chloroplatinate, chloropalladic acid or chloroplatinic ac...

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Abstract

The invention relates to a preparation method of m-sulfanilic acid. The preparation method comprises the following steps: 1, adding sodium metanitrobenzene sulfonate, water, a catalyst and a stabilizing agent into each reaction kettle in advance according to the mass ratio of 1 to (0.6 to 2) to (0.001 to 0.03) to (0.0005 to 0.15); 2, displacing air in each kettle by utilizing nitrogen gas and thendisplacing the nitrogen gas in each kettle by utilizing hydrogen gas; then pre-heating the material in each kettle to 60 to 120 DEG C; 3, continuously conveying the sodium metanitrobenzene sulfonate,the water, the catalyst and the stabilizing agent into the first reaction kettle through a material pump according to the mass ratio of 1 to (0.6 to 2) to (0.001 to 0.03) to (0.0005 to 0.15); after reacting, discharging into a gas-liquid separator. According to the preparation method provided by the invention, the m-sulfanilic acid is produced in a kettle type continuous hydrogenation manner, sothat the production efficiency is improved and the labor intensity is reduced; energy saving and emission reduction are realized and the production cost is lower.

Description

technical field [0001] The invention relates to a preparation method of m-aminobenzenesulfonic acid, belonging to the technical field of catalysts. Background technique [0002] Aminobenzenesulfonic acid is an intermediate used in many dyes. M-aminobenzenesulfonic acid is mainly obtained by reduction of m-nitrobenzenesulfonic acid. Iron powder reduction of m-nitrobenzenesulfonic acid to produce m-aminobenzenesulfonic acid has the advantages of low raw material purity requirements, easy production control, and low cost, but produces a large amount of waste water and amine-containing iron sludge, which will cause serious pollution to the factory and the environment. The catalytic hydrogenation process has many advantages such as simple process route, high product yield, good product quality, and environmental friendliness. It is a green process advocated by the current industrial structure adjustment. However, m-nitrobenzenesulfonic acid, an industrial raw material, generall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/22C07C309/46B01J23/50B01J27/24B01J37/02B01J37/16B01J35/10
CPCB01J23/50B01J27/24B01J35/1028B01J37/0201B01J37/16C07C303/22C07C309/46Y02P20/10
Inventor 李小年张群峰朱秀全
Owner HEBEI JIANXIN CHEM IND CO LTD