What is the role for biorefineries?

摘要

In recent years there has been considerable interest in the concept of biorefineries - factories that will use biomass as a feedstock to produce a range of chemicals similar to those currently produced from crude oil in an oil refinery. One point of debate is whether the development of biorefineries will be an opportunity or a threat to the pulp and paper industry.rnIt is the view of the present authors that much of the current discussion is based on an incorrect understanding of the issues and of the scale of the industry. This paper will address the markets which the first few generations of biorefineries are likely to serve. Over a longer period of time the situation is likely to change.rnCurrently products are made from oil because this is the cheapest route. The pulp industry produces about as much by-product lignin as it does chemical pulp. This is available as a very low cost raw material (fuel replacement value at most) and yet the quantity of lignin that is converted into profitable products is minute. The difficulty is that lignin is not an ideal feedstock, and is unlikely to become one until crude oil prices are much higher than at presentrnOver half of the oil produced is used to make transport fuels. In the near future, these are likely to be partly replaced with ethanol or other liquid chemicals produced from sugars and poly-saccharides. The technology used here is much more familiar to the pulp and alcoholic beverage industries than to the oil industry, and there is scope for the pulp industry to grow by serving this market.rnThe next largest use for oil is probably as a fuel for stationary units. At the present state of development of synthetic fuels, it is much more economic to fire such units with solid biomass (or in some cases to use gasified biomass) than to go to the expense and complexity of producing synthetic liquid fuelsrnOnly about 15% of oil ends up as 'other products' -including bitumen, petrochemicals, polymers, fibres and solvents. As oil becomes scarce and more expensive, we can expect bio-mass to replace it for some of the 'easier' applications (such as ethanol). The remaining oil produced will be used to produce these other chemicals - but in competition with organics derived from bio-mass. We can expect there to be a gradual shift with the products which can be most easily (and cheaply) be made from biomass moving to this route first.rnThus any shift to bio-refining could represent an opportunity rather than a threat to the pulp and paper industry - possibly through alliances with oil companies and perhaps agricultural processing companies. The challenge will be to take this opportunity.