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Corn+Soybean Digest

New Life Cycle Profile Shows U.S. Soy Delivers Environmental & Energy Benefits

The United Soybean Board (USB) released a new peer-reviewed life cycle profile today that documents multiple energy and environmental benefits of U.S. soybean farming and processing. It confirms why manufacturers are increasingly using U.S. soy in green chemistry for a wide array of biobased products.

Renewable by nature, U.S. soy is used as an ingredient in a diverse group of biobased products. They range from biodiesel that fuels vehicles to the resins that go in the exterior panels of cars and farm machinery to spray foam insulation for buildings to lubricants for many uses.

“This profile is the first comprehensive life cycle study covering U.S. soybean production through four major biobased products,” says Wynne, AR, soybean farmer John Cooper, a USB director and member of the USB domestic marketing committee. “U.S. soy already delivers environmental and energy benefits. It’s exciting to see the trends point to even more in the future.”

Omni Tech International, Ltd. conducted the study for USB. Four Elements Consulting, LLC performed the life cycle assessment modeling. A group of international reviewers verified the project was performed in accordance with International Organization for Standardization (ISO) 14040/44 Life Cycle Requirements. Reviewers included Martin Patel of Utrecht University and Michael Levy of the American Chemistry Council.

A key objective was to update life cycle inventory (LCI) databases for soybean production and processing as well as conversion into four key soy-derived feedstocks (methyl soyate, soy lube base stock, soy polyol and soy resin) used in fuel and industrial products. Its cradle-to-gate scope begins with soybean farming (the cradle) and goes through processing of products (the gate).

Currently, the data included in the Department of Energy’s U.S. Life Cycle Inventory is based on three years, 1998 to 2001. This project is based on U.S. agricultural data for the 2001-2007 period. It also contains actual data on soybean processing, commonly known as crushing, that was not previously available.

Key findings on soybean production and processing:

Significant greenhouse gas reductions are identified through soybean production. As soybeans grow, they remove carbon equivalent of taking 21 million cars off the road when the figures are computed using the Environmental Protection Agency’s Greenhouse Gas Equivalencies Calculator.

Soybean yields are on the rise. The average soybean yield for 2004-2007 was 42.3 bu./acre. This represents a 12% increase over the data (1998-2000 average) used in the current U.S. LCI database. This is consistent with other analysis that found plant breeders have succeeded in increasing the yield potential of soybeans by an average of 0.41 bu./acre/year for the past 35 years. Meanwhile, plant-breeding companies anticipate new soybean varieties will allow farmers to increase soybean yields by 40% in the next decade.

The calculated release of nitrous oxide (N2O), a greenhouse gas, is 85% less than the data contained in the current U.S. LCI Database due to a corrected emission factor issued by the International Panel on Climate Change (IPCC) in 2006. The updated data show approximately 20% less direct energy used in soybean farming due to reduced diesel and gasoline usage; soybean-processing facilities reduced their energy consumption by 45% compared to 1998 data.

Also, as part of the study, a life cycle impact assessment (LCIA) was completed for each of the four soy-derived feedstocks using the updated LCI information. These LCIAs show the soy-based feedstocks each significantly reduced greenhouse gas emissions compared to their petroleum-based counterparts. In addition, all four of the soy-derived feedstocks had lower fossil fuel depletion impacts than their petroleum-based counterparts.

The study provides an important resource for companies to update life cycle assessments on their specific products made using U.S. soy.

“The United Soybean Board’s study sheds even more light on why biodiesel is good for the environment,” says National Biodiesel Board Director of Sustainability Don Scott. “Biodiesel production and use recognizes and builds on this progress.”

For example, biodiesel production facilities reduced their energy consumption by 27% compared to the 1998 data. Biodiesel has even more benefits when one calculates the emissions reductions when it is used to fuel a vehicle.

“Using rapidly renewable materials feels like the right thing to do,” says Ashland Performance Materials Product Manager Bob Moffit. “The LCA provided by Omni Tech allows Ashland to show our customers that using ENVIREZ rapidly renewable content resin not only feels right, but truly improves the environmental profile of their products and reduces the reliance on traditional petrochemical-based resins."

“At BioBased Technologies we develop, manufacture and sell renewable-content polyols for the polyurethane industry,” says Sales Manager for Polyols, Shelly West. “We believe this LCA information from USB and Omni Tech will help our customers see the bigger life cycle perspective to improve their product sustainability profile by choosing renewable-based materials that are price and performance competitive and made in the U.S.A.”

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