JPS57102857A - Preparation of 1-aminonaphthalene-3,6,8-trisulfonic acid - Google Patents
Preparation of 1-aminonaphthalene-3,6,8-trisulfonic acidInfo
- Publication number
- JPS57102857A JPS57102857A JP17832880A JP17832880A JPS57102857A JP S57102857 A JPS57102857 A JP S57102857A JP 17832880 A JP17832880 A JP 17832880A JP 17832880 A JP17832880 A JP 17832880A JP S57102857 A JPS57102857 A JP S57102857A
- Authority
- JP
- Japan
- Prior art keywords
- nitrated
- compound
- mixture
- reduction
- stoichiometric amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare the titled compound quantitatively, by feeding a nitro compound which is a raw material of reduction reaction and is adjusted to a pH within a specific range, together with stoichiometric amount of iron powder to keep the pH in the reducing vessesl in the acidic range, continuously into the reducing vessel, and carrying out the reduction of the nitro compound.
CONSTITUTION: A mixture of nitrated naphthalenetrisulfonic acid (e.g. 1-nitronaphthalene-3,6,8-trisulfonic acid) is adjusted to pH1W4.5, and introduced together with stoichiometric amount of iron powder necessary to reduce the nitrated mixture into a reaction vessesl always containing excess iron powder (3.5W6.5 times weight of the stoichiometric amount necessary to reduce the nitrated mixture). The compound is made to react in a weakly acidic range at pH≤7, and the objective compound is extracted continuously from the reducing vessel. When the nitrated mixture is neutralized to the neutral range, the reaction liquid is shifted to the alkaline side by the amine and iron hydroxide, etc. produced by the reduction reaction, and the rate of reduction is lowered.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17832880A JPS57102857A (en) | 1980-12-16 | 1980-12-16 | Preparation of 1-aminonaphthalene-3,6,8-trisulfonic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17832880A JPS57102857A (en) | 1980-12-16 | 1980-12-16 | Preparation of 1-aminonaphthalene-3,6,8-trisulfonic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57102857A true JPS57102857A (en) | 1982-06-26 |
JPS636064B2 JPS636064B2 (en) | 1988-02-08 |
Family
ID=16046561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17832880A Granted JPS57102857A (en) | 1980-12-16 | 1980-12-16 | Preparation of 1-aminonaphthalene-3,6,8-trisulfonic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57102857A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103113269A (en) * | 2013-01-23 | 2013-05-22 | 绍兴奇彩化工有限公司 | 1,8-dinitro-3,6-naphthalene disulfonate hydrogenation reduction method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5490124A (en) * | 1977-12-23 | 1979-07-17 | Ciba Geigy Ag | Method of reduction |
-
1980
- 1980-12-16 JP JP17832880A patent/JPS57102857A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5490124A (en) * | 1977-12-23 | 1979-07-17 | Ciba Geigy Ag | Method of reduction |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103113269A (en) * | 2013-01-23 | 2013-05-22 | 绍兴奇彩化工有限公司 | 1,8-dinitro-3,6-naphthalene disulfonate hydrogenation reduction method |
CN103113269B (en) * | 2013-01-23 | 2015-07-22 | 绍兴奇彩化工有限公司 | 1,8-dinitro-3,6-naphthalene disulfonate hydrogenation reduction method |
Also Published As
Publication number | Publication date |
---|---|
JPS636064B2 (en) | 1988-02-08 |
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