www.pulpandpapercanada.com/Issues/ISarticle.asp?id=2014 -
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Published on: 9/26/2008
Last Visited: 9/26/2008
Over at the chemistry department of the University of British Columbia, Professor Emeritus Brian James is singing the blues ... blue-stained pulp, that is.Dingy blue-stained chips makes for dingy, blue-ish paper.Compared to green healthy wood, mechanical pulps from MPB lodgepole fibre have much lower brightness.
Bleaching grey-stage MPB pulp with alkaline hydrogen peroxide helps somewhat, but it isn't enough.The resulting brightness gap is commercially unacceptable.
James and his FII-funded UBC research team hope to jump the gap via a new and less expensive route, to a proven, yet costly, bleaching agent.There is an existing water-soluble chelating phosphine compound which is extremely effective at bleaching MPB stain but carries what James calls a "ridiculous price" of around $150 a gram. (It also carries a tongue-twisting name: bis[bis(hydroxymethyl) phosphino]ethane commonly abbreviated as BBHPE.) In a sort of chemical reverse engineering, James hopes to create a cost-effective synthetic route to BBHPE -and at a far cheaper price.
The costs have already been reduced significantly.First, the team improved on the literature prep and eliminated an expensive platinum catalyst.Next, they plan to switch to inexpensive, non-flammable ethylene glycol as the precursor, or base chemical.Says James, "I think we're making very good progress and we've got one very good way to make it more cheaply."
It is still in the early stages, but James says the research, testing and brightness assessment, scheduled for a mid-2009 completion, show promise.Assuming all goes well, the next step is to find a company willing and able to scale-up production of this BBHPE from lab-size amounts to full commercial production.Ideally, it would price in at around three to four dollars a kilo, or similarly to alkaline hydrogen peroxide.
"I think it will work," says James."It's just a question of getting enough [BBHPE] material and a cheaper method.