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Pulp Paper & Logistics


VALMET 11


the purified methanol or debottlenecking the recovery boiler,” says Anders Rothelius, manager of evaporation applications and technology at Valmet. “A pulp mill with a production of 400,000 tonnes of pulp per year produces approximately 15 tonnes of methanol per day, and for a mill like this, the combined benefits could reach several million dollars a year.”


Using purified methanol instead of the normal quality brings benefits like better combustion, lower emissions and higher availability. And if 15 tonnes of methanol per day is used as fuel instead of oil, the mill saves US$900,000 a year or more, lowering its carbon footprint. The benefits will be greater for mills with access to a market for bio-methanol. Fossil methanol sells at around $500 per tonne, but since there is no established market for bio-methanol, it is


difficult to predict its value. Selling 15 tonnes of purified methanol per day at the price of fossil methanol produces annual revenue of $2.6 million. And it’s likely that the bio-methanol will command a premium. Removing methanol from


the recovery boiler fuel mix can also enable increased pulp production. If the recovery boiler is the limiting factor, the mill will be able to produce one extra tonne of pulp for every tonne of methanol that is removed. If extra pulp brings $250 per tonne, including other costs, 15 additional tonnes of pulp per day will increase profits by approximately $1.3 million per year.


A methanol upgrade Liquid methanol systems can now be upgraded with a purification step. And if the resulting bio- methanol is distilled, it becomes so pure that it can be used in


“Purified and distilled methanol is clean enough to be used in other chemical processes like chlorine dioxide production. This will displace fossil methanol use for this purpose at the mill,” says Anders Rothelius, manager of evaporation applications and technology at Valmet, can be contacted by email at anders. rothelius@valmet.com


chemical processes. This makes it possible for pulp mills to displace fossil-based methanol for the production of chlorine dioxide, an important bleaching chemical. “The methanol purification


plant that was built during the development project was operated at a pulp mill for almost 4,000 hours without problems.


The design was later completed and is now proven for commercial applications. The development of the technology was made possible with the help of several industry partners, and we’re now ready to help pulp mills use this technology to bring their performance forward,” Rothelius concludes.


Packaging International


Consumers worldwide are increasingly demanding packaging that is both recyclable and has the least impact on the environment. Green Packaging International will provide brand owners and packaging manufacturers with the latest developments in all types of processes and materials that are at the cutting edge of green environmental thinking.


Coming soon from the publisher of Pulp Paper & Logistics and Forest Bioenergy Review Email: greenpackinternational@virginmedia.com


July/August 2020


Green


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