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Preparation method of o-aminobenzenesulfonic acid

A technology of anthranilic acid and nitrobenzenesulfonic acid, which is applied to the preparation of sulfonic acid, the preparation of organic compounds, chemical instruments and methods, etc., and can solve the problems of low production efficiency, low safety, and high energy consumption

Inactive Publication Date: 2018-05-25
YANTAI ANOKY FINE CHEM CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problems of serious environmental pollution, cumbersome process operation, high energy consumption, low safety, and high material and labor costs in the preparation process of anthranilic acid in the prior art. , the problem of low production efficiency, thus a kind of preparation method of anthranilic acid is provided

Method used

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  • Preparation method of o-aminobenzenesulfonic acid

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Comparison scheme
Effect test

Embodiment 1

[0096] A kind of preparation method of o-aminobenzenesulfonic acid, take o-nitrobenzenesulfonic acid as raw material, adopt Pd / Al 2 o 3 Catalyst, continuous catalytic hydrogenation reaction is carried out in the reactor, after the catalyst is separated and recovered, the reducing solution is desolvated and purified to obtain the target product anthranilic acid.

[0097] Specific steps include:

[0098] (1) Put 5000kg of 50% methanol aqueous solution and 1250kg of o-nitrobenzenesulfonic acid into the chemical material tank, follow-up feeding is carried out according to this ratio, stir evenly, pump into the first-level hydrogenation reactor, and add Pd / Al 2 o 3 Catalyst 125kg, the particle size of the catalyst is 10nm, pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 90-100°C, and pump it into the first-stage hydrogenation tank at a flow rate of 6000L / h The raw ma...

Embodiment 2

[0102] (1) Put 5000kg of 50% methanol aqueous solution and 1250kg of o-nitrobenzenesulfonic acid into the chemical material tank, follow up the feeding according to the ratio, stir evenly, pump into the primary hydrogenation reactor, and add Pd / Al 2 o 3 125kg of catalyst, the particle size of the catalyst is 500μm; pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 80-90°C, and pump it into the first-stage hydrogenation tank at a flow rate of 5000L / h The raw material solution of o-nitrobenzenesulfonic acid is passed into H 2 , control the hydrogen pressure in the system to 3.0MPa, and add Pd / Al to the primary hydrogenation reactor every 3h 2 o 3 Catalyst 2.5 kg, after the material in the primary hydrogenation tank gradually increases, it flows into the secondary hydrogenation tank through the overflow port, the material stays in the hydrogenation tank for about 2-3h...

Embodiment 3

[0106] (1) Put 12500kg of 50% methanol aqueous solution and 1250kg of o-nitrobenzenesulfonic acid into the chemical material tank, and the subsequent feeding is stirred evenly according to the ratio. Al 2 o 3 Catalyst 125kg, the particle size of the catalyst is 10nm; pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 90-100°C, and pump it into the primary hydrogenation tank at a flow rate of 6000L / h The raw material solution of o-nitrobenzenesulfonic acid is passed into H 2 , control the hydrogen pressure in the system to 3.0MPa, and add Pd / Al to the primary hydrogenation reactor every 3h 2 o 3 Catalyst 2.5kg, after the material in the primary hydrogenation tank gradually increases, it flows into the secondary hydrogenation tank through the overflow port. acid residue ≤ 0.2%), overflow to the settling tank through the secondary hydrogenation tank.

[0107] (2) Af...

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Abstract

The invention discloses a preparation method of o-aminobenzenesulfonic acid. The method comprises performing continuous catalytic hydrogenation on o-nitrobenzenesulphonic acid, sedimentation and membrane filtration to obtain the o-aminobenzenesulfonic acid. The preparation method of the o-aminobenzenesulfonic acid is simple in operation, high in safety and applicable to continuous production and can achieve the effects of high production efficiency, high product quality, low labor intensity, environmental friendliness, high catalyst utilization rate and industrialization applicability.

Description

technical field [0001] The invention belongs to the field of chemical product production, and in particular relates to a preparation method of anthranilic acid. Background technique [0002] Anthranilic acid is an important reactive dye intermediate used in the production of reactive brilliant red K-2B, brilliant red K-2BP, brilliant red K-2G, brilliant red M-2B, brilliant red X-B, brilliant red X -10B, reactive violet K-3R, etc. Using o-nitrobenzenesulfonic acid as raw material, the existing production method in my country is mainly the traditional iron powder reduction method, which uses iron powder. After reduction, a large amount of iron sludge needs to be removed. The operation process is complicated, and a large amount of iron sludge The production of the environmental pollution is extremely serious, and the traditional production method is no longer suitable for chemical production in the form of increasingly severe environmental protection trend. Now, there are repo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/22C07C303/44C07C309/46B01J23/44
CPCB01J23/44C07C303/22C07C303/44C07C309/46
Inventor 曲美君刘云龙刘祥庆张永明杨勇
Owner YANTAI ANOKY FINE CHEM CO LTD
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