Location: CA-QC - Canada, Québec
This dataset represents the mechanical soybean processing into soybean meal and crude soy oil. This dataset is associated to a typically on farm location technology. If the user requires an industrial process, we suggest the “soybean meal and crude oil production” dataset which represents a different chemical extraction process
. In the mechanical extraction process, received soybeans are examined and damaged seeds are eliminated. The soybeans are then cracked into four to six particles by corrugated cracking rolls. The hulls are separated from the soybeans by aspiration. Dehulled soybeans are then extruded (a machine consisting of a screw rotating inside a barrel). The heat is generated by the extruder through friction allows for cooking, sterilizing, stabilizing, texturizing and dehydrating soybeans. Upon leaving the extruder, hot soybeans are conveyed into an expeller, a screw press, which squeezes the oil from soybeans. Expellers have generally an oil removal efficiency of about 65 to 67% (Riaz, 2005).

Riaz, M. N., Bailey’s Industrial Oil and Fat Products: Extrusion Processing of Oilseed Meals for Food and Feed Production. In John Wiley & Sons, Inc.: 2005; Vol. Sixth Edition, Six Volume Set
Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.