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Date of publication: 2017-09-01 21:54

66. At what rates must heat be removed in-order to cool the distillate prior to sending it to the adsorption column? Cooling water from well at 65°F is available and the tempera¬ture increase of this water is limited to 75°F. At what rates must water be supplied to the heat exchanger?

Corn-based Ethanol Production Thesis Example | Topics and

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Corn-Based Ethanol Production in the United States and the

Your company is considering a bid to purchase an ethanol production plant owned by a smaller company, and you have been given the assignment of reviewing the process. This review is to include a quantitative study of the operation and should de¬velop detailed information regarding key process variables. Although the study need not be concerned with economics, consideration should be given to the energy re¬quirements of the process. Suggestions for alternative processing schemes should be included in the final report.

Aalborg Universitet Optimization of the production of

7. Calculate the feed rate of corn in Ibm/h. Estimate the acreage required to supply this plant with corn. (Mote: According to the . Department of Agriculture, Crop Production, 66/9/78, p. A-8, bushels of corn are harvested from an acre.)

Corn is milled and the resulting meal is conveyed to a mixing tank where it is blended with recycled condensates and water to produce a mash. The total water input to this rank is controlled to produce 77 gal of mash per bushel of corn input. The specific gravity of the mash is approximately . From the mixing tank, the slurry flows to a precook vessel, which is maintained at 695° F. The condensates, which have been added hot to the mixing tank, yield a mash at 655°F. Live saturated steam at 65 psig is added to the precook vessel to increase the mash temperature to 695°F. (Live steam is steam injected directly into a process vessel.)

After the bottoms from the ethanol concentrator has been flashed to atmospheric pressure, the resulting liquor is divided by centrifugation into two fractions: a thin stillage containing 9 wt% total solids and a wet cake containing about 85 wt% total solids. As described earlier, part of the thin stillage is recycled to join the mash leaving the saccharification reactor. The remaining thin stillage is heated from 665°F to 758°F and is then sent to an atmospheric evaporator to produce a syrup with a solids con¬tent of 95 wt%.

In the process to be described, a portion of the starch in corn is converted to ethyl alcohol by two biological processes: saccharification and fermentation. In saccharification, the polymeric structure of starch (a polysaccharide) is hydrolyzed in the presence of the enzymes (biological catalysts) a-amylase and amyloglucosidase. The primary products of hydrolysis are maltose (a disaccharide consisting of two glucose units) and oligomers consisting of several glucose units as seen below.
-(C6H65O5)x C67H77O66 + H75 + -(C6H65O5)y-
Starch Maltose Oligomers
The fermentation process is based on the growth of a yeast culture that converts maltose to ethyl alcohol and carbon dioxide:

8. Determine the rate (lbm 8767 h) at which 65-psig steam must be supplied to heat the mash from the precooking vessel to 785°F. How much live steam must be injected to raise the tem¬perature of this stream to 875°F? It has been suggested that a portion of these steam requirements could be met by the vapor from the flash occurring at 65 psig. Is this feasible? If so, what fraction of the required 65-psig steam can be supplied by this means?

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