Method for preparing alkaline solutions containing aromatic...

D - Textiles – Paper – 21 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

D21C 11/00 (2006.01) C08H 7/00 (2011.01)

Patent

CA 2283698

The invention proposes a process which enables separation of aromatic polymers which can be precipitated by acidification, as can be found especially in waste water from cellulose production, from an alkaline solution in a reliable manner and in pure form. To achieve good separation capacity, especially by filtration, it is proposed that the polymers be precipitated by reducing the pH at a relatively low temperature, typically between 15 and 60°C, and the dispersion be subsequently reheated until it passes into filterable form, typically between 50 and 95°C. The product separated in this way for example by filtration can be washed and can be dried at a high temperature, especially up to 110°C, without becoming black.

L'invention concerne un procédé permettant la séparation de façon sûre et sous forme pure de polymères aromatiques précipitables par acidification, tels qu'on les trouve en particulier dans les eaux résiduaires de la production de cellulose, d'une solution alcaline. Afin d'obtenir un bon pouvoir de séparation, en particulier par filtration, les polymères sont précipités par abaissement de la valeur du pH à une température relativement basse, généralement entre 15 et 60 DEG C, puis la dispersion est à nouveau réchauffée jusqu'à ce qu'elle passe en forme filtrable, généralement entre 50 et 90 DEG C. On peut laver le produit séparé ainsi par filtration, par exemple, et le sécher à température élevée, jusqu'à 110 DEG C en particulier, sans qu'il devienne noir.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method for preparing alkaline solutions containing aromatic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing alkaline solutions containing aromatic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing alkaline solutions containing aromatic... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2038082

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.