CN103288689A - Preparation method of 1-naphthylamine 8-sulfonic acid - Google Patents
Preparation method of 1-naphthylamine 8-sulfonic acid Download PDFInfo
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- CN103288689A CN103288689A CN 201210053785 CN201210053785A CN103288689A CN 103288689 A CN103288689 A CN 103288689A CN 201210053785 CN201210053785 CN 201210053785 CN 201210053785 A CN201210053785 A CN 201210053785A CN 103288689 A CN103288689 A CN 103288689A
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- sulfonic acid
- naphthalene
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Abstract
The invention relates to a preparation method of 1-naphthylamine 8-sulfonic acid. The preparation method comprises the following steps of: firstly, dissolving naphthylamine in sulfuric acid at a temperature in the range from 35 to 45 DEG C, and then reacting for 2-3 hours, thereby obtaining 1-naphthalene sulfonic acid; next, carrying out a reaction on the product 1-naphthalene sulfonic acid and the mixed acid of nitric acid and sulfuric acid to generate 1-sulfonic acid group 8-nitronaphthalene, and carrying out the reaction at a temperature in the range from 30 to 95 DEG C; and thirdly, carrying out a reaction on the product 1-sulfonic acid group 8-nitronaphthalene and iron powder and water vapour, thereby generating 1-naphthylamine 8-sulfonic acid, wherein the reaction is carried out at a temperature in the range from 60 to 180 DEG C.
Description
The preparation method of naphthalidine 8-sulfonic acid of the present invention belongs to chemical field, relates to the preparation of fine chemicals, is a kind of preparation method of naphthalidine 8-sulfonic acid specifically.
Naphthalidine 8-sulfonic acid is a kind of fine chemicals, can be used for preparing dyestuff, medicine, agricultural chemicals etc.
The object of the present invention is to provide a kind of method for preparing naphthalidine 8-sulfonic acid.
Purpose of the present invention can realize by following steps:
(1) preparation method of naphthalidine 8-sulfonic acid of the present invention is to be raw material with the naphthalene, at first naphthalene is melted in the sulfuric acid under 35-45 ℃, reacts then 2-3 hour, obtains 1-naphthalene sulfonic aicd, and the chemical formula of this reaction is as follows:
(2) with the mixing acid reaction of above-mentioned product 1-naphthalene sulfonic aicd and nitric acid and sulfuric acid, generate 1-sulfonic group 8-nitro-naphthalene, be reflected under 30-95 ℃ and carry out, the chemical formula of this reaction is as follows:
(3) with above-mentioned product 1-sulfonic group 8-nitro-naphthalene and iron powder and water vapour reaction, generate naphthalidine 8-sulfonic acid, be reflected under 60-180 ℃ and carry out, the chemical formula of this reaction is as follows:
Advantage of the present invention:
The sulfur oxide waste gas that produces in the production can absorb the back with falling-film absorber and be applied to alleviate environmental pollution in the production as sulfuric acid.
Be described in further detail below by embodiment:
Produce 1000 tons of naphthalidine 8-sulfonic acid production equipments per year, at first naphthalene is melted in the sulfuric acid under 35-45 ℃, reacted then 2-3 hour, obtain 1-naphthalene sulfonic aicd; With the mixing acid reaction of above-mentioned product 1-naphthalene sulfonic aicd and nitric acid and sulfuric acid, generate 1-sulfonic group 8-nitro-naphthalene then, be reflected under 30-95 ℃ and carry out; The 3rd step generated naphthalidine 8-sulfonic acid with above-mentioned product 1-sulfonic group 8-nitro-naphthalene and iron powder and water vapour reaction, was reflected under 60-180 ℃ and carried out.
Claims (1)
1.1-the preparation method of naphthylamines 8-sulfonic acid is characterized in that: the preparation method of (1) naphthalidine 8-of the present invention sulfonic acid is to be raw material with the naphthalene, at first naphthalene is melted in the sulfuric acid under 35-45 ℃, reacts then 2-3 hour, obtains 1-naphthalene sulfonic aicd;
(2) with the mixing acid reaction of above-mentioned product 1-naphthalene sulfonic aicd and nitric acid and sulfuric acid, generate 1-sulfonic group 8-nitro-naphthalene, be reflected under 30-95 ℃ and carry out;
(3) with above-mentioned product 1-sulfonic group 8-nitro-naphthalene and iron powder and water vapour reaction, generate naphthalidine 8-sulfonic acid, be reflected under 60-180 ℃ and carry out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210053785 CN103288689A (en) | 2012-02-27 | 2012-02-27 | Preparation method of 1-naphthylamine 8-sulfonic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201210053785 CN103288689A (en) | 2012-02-27 | 2012-02-27 | Preparation method of 1-naphthylamine 8-sulfonic acid |
Publications (1)
| Publication Number | Publication Date |
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| CN103288689A true CN103288689A (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210053785 Pending CN103288689A (en) | 2012-02-27 | 2012-02-27 | Preparation method of 1-naphthylamine 8-sulfonic acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105481728A (en) * | 2015-12-25 | 2016-04-13 | 铜陵化工集团有机化工有限责任公司 | Preparation method of 1-naphthylamino-8-sulfonic acid |
-
2012
- 2012-02-27 CN CN 201210053785 patent/CN103288689A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105481728A (en) * | 2015-12-25 | 2016-04-13 | 铜陵化工集团有机化工有限责任公司 | Preparation method of 1-naphthylamino-8-sulfonic acid |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130911 |