CN1491935A - Producing metaphenylene diamine by rectifying method - Google Patents
Producing metaphenylene diamine by rectifying method Download PDFInfo
- Publication number
- CN1491935A CN1491935A CNA011209364A CN01120936A CN1491935A CN 1491935 A CN1491935 A CN 1491935A CN A011209364 A CNA011209364 A CN A011209364A CN 01120936 A CN01120936 A CN 01120936A CN 1491935 A CN1491935 A CN 1491935A
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- China
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- producing
- dinitrobenzene
- mphenylenediamine
- waste water
- metaphenylene
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention provides a new technology of producing metaphenylene. Dinitrobenzene with three kinds of isomers is reduced completely and rectifying separated to obtain pure metaphenylene, and the dinitrobenzene is not refined with sodium nitrite avoiding producing great amount of high concentration toxic waste water. The improved technological process produces no waste water and can recover catechol and hydroquinol.
Description
The present invention proposes a kind of new technology of producing mphenylenediamine,
Mphenylenediamine is a kind of important dyestuff intermediate.Its specification of quality is higher, zero pour is not less than 62.0 ℃, and purity is not less than 99.5%.Conventional production is: the nitrated one-tenth dinitrobenzene of benzene or oil of mirbane in the nitration product, contains 10% o-dinitrobenzene, 2% paradinitrobenzene and 88% Meta-dinitrobenzene approximately.Be to remove the ortho para dinitrobenzene, adopt S-WAT refining, it is water-soluble and separate to generate corresponding nitrobenzene-sulfonic acid salt.Simultaneously, Meta-dinitrobenzene also loses because of certain reaction, thereby produces the poisonous waste water of a large amount of high densitys, contaminate environment.A kind of way is that waste water is concentrated, again through burning.Though this method is feasible but inadvisable, too high because of burning cost, enterprise is difficult to bear.
Characteristics of the present invention are: refining without S-WAT, but with its Restore All, then with three kinds of diaminobenzenes through rectifying separation to obtain pure product mphenylenediamine.Therefrom as can be seen: present technique is thoroughly to reform from technological process to start with, and make it no longer to produce poisonous waste water, but also recyclable two kinds of byproduct O-Phenylene Diamines and Ursol D is increased economic efficiency enterprise.
Type approval test through rectifying has successfully reached set objective, and mphenylenediamine purity reaches 99.5%, and O-Phenylene Diamine purity also reaches 99%, compares with original technology, and this technology has following advantage:
1, do not produce poisonous waste water, thoroughly eliminate pollution environment.
2, reclaim O-Phenylene Diamine and Ursol D, make enterprise increase economic benefit.
3, new technology goes out that product impurity is few, appearance white (old technology mostly is brown).
4, owing to when refining, lose 8% Meta-dinitrobenzene with S-WAT approximately, present technique is refining without S-WAT, and the yield of mphenylenediamine is improved.
5, save the S-WAT expense of raw materials.
Claims (3)
1, a kind of mphenylenediamine new technology of producing is characterized in that: the ortho para isomer in the dinitrobenzene, refining without S-WAT, but behind the Restore All, with rectification method separate and pure product mphenylenediamine, reclaim O-Phenylene Diamine and Ursol D simultaneously.
2, according to claim 1, it is characterized in that: present technique is suitable for the rectifying separation of the mixing diaminobenzene of various method of reducing gained.
3, according to claim 1, it is characterized in that: present technique is suitable for various types of rectifier units, as long as enough stage number are arranged, just can obtain pure product mphenylenediamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA011209364A CN1491935A (en) | 2001-06-15 | 2001-06-15 | Producing metaphenylene diamine by rectifying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA011209364A CN1491935A (en) | 2001-06-15 | 2001-06-15 | Producing metaphenylene diamine by rectifying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1491935A true CN1491935A (en) | 2004-04-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA011209364A Pending CN1491935A (en) | 2001-06-15 | 2001-06-15 | Producing metaphenylene diamine by rectifying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1491935A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070464A (en) * | 2011-02-16 | 2011-05-25 | 上海安诺芳胺化学品有限公司 | Method for producing phenylene diamine by performing hydrogenation reduction on mixed dinitrobenzene with palladium catalyst |
| CN102942485A (en) * | 2012-10-25 | 2013-02-27 | 浙江龙盛化工研究有限公司 | Method for m-dinitrobenzene refinement and effective byproduct utilization |
| CN103435495A (en) * | 2013-05-08 | 2013-12-11 | 如皋市金陵化工有限公司 | Purification process for o-phenylenediamine |
| CN107286024A (en) * | 2017-06-06 | 2017-10-24 | 青岛科技大学 | A kind of edulcoration purification process of m-phenylene diamine (MPD) |
-
2001
- 2001-06-15 CN CNA011209364A patent/CN1491935A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070464A (en) * | 2011-02-16 | 2011-05-25 | 上海安诺芳胺化学品有限公司 | Method for producing phenylene diamine by performing hydrogenation reduction on mixed dinitrobenzene with palladium catalyst |
| CN102070464B (en) * | 2011-02-16 | 2013-09-04 | 上海安诺芳胺化学品有限公司 | Method for producing phenylene diamine by performing hydrogenation reduction on mixed dinitrobenzene with palladium catalyst |
| CN102942485A (en) * | 2012-10-25 | 2013-02-27 | 浙江龙盛化工研究有限公司 | Method for m-dinitrobenzene refinement and effective byproduct utilization |
| CN102942485B (en) * | 2012-10-25 | 2014-12-10 | 浙江龙盛化工研究有限公司 | Method for m-dinitrobenzene refinement and effective byproduct utilization |
| CN103435495A (en) * | 2013-05-08 | 2013-12-11 | 如皋市金陵化工有限公司 | Purification process for o-phenylenediamine |
| CN103435495B (en) * | 2013-05-08 | 2016-03-09 | 如皋市金陵化工有限公司 | The purifying technique of O-Phenylene Diamine |
| CN107286024A (en) * | 2017-06-06 | 2017-10-24 | 青岛科技大学 | A kind of edulcoration purification process of m-phenylene diamine (MPD) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |