Extraction of oil from the thin stillage or distillers’ grains with solubles (DGS) streams is a proven technology. . .
Here is a big download PDF, but it is the actual Regulatory Impact Analysis (PDF) before it is copied and published into the Federal Register. LOOK PAGE 50-51 ABOUT CORN OIL EXTRACTION - or just read below
http://www.epa.gov/OMS/renewablefuels/420d09001.pdf
1.1.3.2 Corn Oil Extracted During Ethanol Production
A source of feedstock which could provide significant volume is oil extracted from corn or fermentation co-products in the dry mill ethanol production process. Often called corn fractionation or dry separation, these are a collection of processes used get additional product streams of value from the corn. This idea is not new, as existing wet mill plants create several streams of product from their corn input, including oil. In a dry mill setting, the kernel can be separated into the bran, starch, and germ components ahead of fermentation, or alternatively, oil can be extracted from the distillers’ grains after fermentation. Both have advantages and disadvantages related to plant capital cost and energy consumption, as well as yield of ethanol and the other coproducts.
Extraction of oil from the thin stillage or distillers’ grains with solubles (DGS) streams is a proven technology that can be retrofit to existing plants relatively cheaply. Front-end separation requires more intensive capital investment than is required to extract oil from the DGS, and therefore is best designed into the plant at the time of construction. However, it yields a larger array of co-products, and generally also results in ethanol process energy savings since less unfermentable material is going through the process train. We expect that this technology will be increasingly deployed in new plants in parallel to existing plants pursuing extraction of oil from DGS. For the sake of simplicity, for this proposal we have chosen to focus for cost and volume estimates on the DGS extraction process.
Specifically, our estimates come from a process developed and marketed by GS Cleantech, Inc., though there are others who will likely develop and market similar processes. Depending on the configuration, this system can extract 20-50 percent of the oil from the fermentation co-products, producing a distressed corn oil stream which can be used as feedstock by biodiesel facilities. Since it offers another stream of revenue from the corn flowing into ethanol plants, we assumed approximately 40 percent of projected total ethanol production will implement this or other oil extraction process by 2022, generating approximately 150 million gallons per year of corn oil biofuel feedstock. We expect this material to be processed in biodiesel plants for the same reasons given above for soy oil. At this time it is uncertain whether there will be third party aggregators of this extracted oil, or whether individual ethanol plants will contract directly with nearby biodiesel facilities, which may ultimately impact where and how this feedstock is processed.
********
Here is some more from page 81-82 same reference:
Corn Oil Extraction
Several dry mill corn ethanol plants have implemented corn oil extraction to produce fuel-grade corn oil for the biodiesel industry. The crude corn oil can either be extracted from the thin stillage (the non-ethanol liquid left after fermentation) before it enters the evaporator, or from the DGS after it has been dried. While the corn oil is of a lower quality and value than that produced from corn fractionation, the equipment can be easily added to existing ethanol production facilities and is relatively inexpensive. In addition to generating an additional
revenue stream from the fuel-grade corn oil, reducing the oil content of the DGS improves its flowability and concentrates its protein content. The de-fatted DGS is more marketable than DGS containing corn oil as higher quantities can be included in dairy and beef cattle feed.
************
Here is another quote GERS used:
Go to page 699.
http://www.scribd.com/doc/14983581/EPA-Renewable-Fuel-Standard-Program-Notice-of-Proposed-Rule-Making#document_metadata
AND ANOTHER:
"Depending on the configuration, such a system can extract 20-50% of the oil from the co-product streams, and produces a distressed corn oil (non-food-grade, with some free fatty acids and/or oxidation by-products) product stream which can be used as feedstock by biodiesel facilities." p. 421 same link
******************
SkunK
Posts
No comments:
Post a Comment