Selected solids separation
A process is disclosed which includes separating selected solids from a process stream with a selected solids mechanical processor containing a filter to produce a filtrate substantially free of selected solids and a retentate containing recovered selected solids. In one embodiment, the process stream contains an increased amount of liquid is provided to a downstream mechanical processor as compared to a process stream having no selected solids mechanical processor upstream. The selected solids mechanical processor can be a dynamic filtration device or a static separation device. Bio-oil recovery efficiency, quantity, and quality can be improved as a result.
1. A process used in an ethanol production facility, the process comprising:
separating selected solids from a process stream in the ethanol production facility to yield a liquid substantially free of the selected solids, wherein the selected solids comprises suspended particles having a buoyancy wherein the suspended particles accumulate at an interface between light/oil and aqueous/heavy phases; and
then passing the process stream through a selected solids mechanical processor to produce a filtrate substantially free of the selected solids and a retentate containing recovered selected solids, wherein the mechanical processor includes a dynamic filtration device which compresses the process stream by structure movable relative to a filter surface against a filter for a time sufficient to further decrease an amount of liquid retained in the retentate.
2. The process of claim 1 , wherein the retentate has been reduced in amount of retained liquid, and the filtrate is provided to a downstream mechanical processor.
3. The process of claim 2 , wherein the downstream mechanical processor is a mechanical processor.
4. The process of claim 2 , wherein the downstream mechanical processor produces an emulsion concentrate or an emulsion which is provided to an emulsion breaking system to break the emulsion concentrate or the emulsion.
5. The process of claim 1 , wherein the selected solids include germ.
6. The process of claim 1 , wherein the process stream is an alcohol production stream comprising centrate, thin stillage, partially concentrated thin stillage, concentrated thin stillage or a combination thereof.
7. The process of claim 1 , further comprising a grinding step to grind the selected solids recovered in the retentate to release bound bio-oil.
8. The process of claim 7 , wherein the released bound bio-oil results in an increased amount of bio-oil recovered by at least about 5% to more than 100%.
9. The process of claim 1 , further comprising a centrifuge downstream of the mechanical processor.
10. The process of claim 9 , wherein the centrifuge further removes suspended solids from the filtrate.
11. The process of claim 1 , further comprising a mechanical grinding device to ground the selected solids from the retentate to liberate bound bio-oil.
12. The process of claim 1 , further comprising a tank to allow bio-oil to leach from the selected solids which is from the retentate, based on a retention time.
13. The process of claim 12 , wherein the retention time is less than 12 hours.