Timeline for P-phenylenediamine Production Process
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Jun 11, 2020 at 10:20 | history | edited | CommunityBot |
Commonmark migration
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| Feb 8, 2015 at 10:06 | comment | added | jonsca | @C.M.Padalia You have inadvertently created a second account. Please use the "Contact Us" in the bottom bar to merge your two accounts. | |
| Feb 8, 2015 at 8:53 | comment | added | user13275 | Mr. Klaus Warzecha, (i).Your answer describes synthesis of para phenylenediamine(PPD) by Reduction of Para Nitroaniline(PNA) with iron. (ii). Thus obtained PPD contains lots of iron impuries with other isomers, and therefore cannot be used as raw material(Monomer)for production of Para amide fiber(Kevlar). (iii). For this purpose catalytic Hydrogenation of PNA is carried out to produce PPD of desired quality(Grade). This is my simple understanding. I am open for edition/addition, please come back. | |
| Feb 3, 2015 at 21:17 | comment | added | Klaus-Dieter Warzecha | @Georg Yes, I have updated my answer and added some information from the Ullmann. | |
| Feb 3, 2015 at 21:17 | history | edited | Klaus-Dieter Warzecha | CC BY-SA 3.0 |
Information on industrial nitration added.
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| Feb 3, 2015 at 21:06 | history | edited | Klaus-Dieter Warzecha | CC BY-SA 3.0 |
Information on chlorination added.
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| Feb 3, 2015 at 20:50 | history | edited | Klaus-Dieter Warzecha | CC BY-SA 3.0 |
Reference for nucleophilic aromatic substitution on an industrial scale added.
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| Feb 3, 2015 at 16:59 | comment | added | Georg | Is this the actual industrial practice? | |
| Feb 3, 2015 at 15:39 | history | answered | Klaus-Dieter Warzecha | CC BY-SA 3.0 |