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Article: Teijin strives to improve the recovery of sulphuric acid during spinning and washing of aramid.(Fibres and yarns)
- Article from:
- Advances in Textiles Technology
- Article date:
- July 1, 2009
- Author:
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Teijin Aramid of Arnhem, The Netherlands, has proposed a method for spinning and washing aramid fibre that allows for the effective recovery and re-use of sulphuric acid and water, uses low amounts of energy and operates in a closed system.
Typically, aramid fibre is produced by dissolving poly(paraphenylene terephthalamide)--PPTA--in pure sulphuric acid and expelling the resulting dope through a spinneret. Washing the fibres in water then removes the acid.
The dilute (about 10-15%) solution of acid in the washing water that is produced can be discarded if it has been neutralized, but such an approach results in considerable emissions of sulphates and is ...