11/5/2023 0 Comments 315130 psi to atmAll plants were designed to produce 50 million gallons per year from either a corn stover or aspen wood feedstock. Analyses were conducted using a simulation model that calculates mass and energy balances, estimates the capital cost of the plant, and determines the selling price of ethanol. Parametric analyses of high-temperature, dilute-acid hydrolysis of cellulose were carried out to determine the effect of hydrolysis parameters and processing schemes on the selling price of ethanol, and to estimate the potential economics of such processes. Original copy available until stock is exhausted Country of Publication: United States Language: English Subject: 09 BIOMASS FUELS ETHANOL COST PRODUCTION ETHANOL PLANTS ECONOMIC ANALYSIS FLOWSHEETS MAIZE ACID HYDROLYSIS BY-PRODUCTS CAPITALIZED COST CARBON DIOXIDE DESIGN DISTILLATION FERMENTATION HEAT TREATMENTS OPERATING COST PROCESS HEAT RECOVERY WASTE PROCESSING ALCOHOLS BIOCONVERSION CARBON COMPOUNDS CARBON OXIDES CEREALS CHALCOGENIDES CHEMICAL REACTIONS DECOMPOSITION DIAGRAMS ECONOMICS ENERGY GRAMINEAE GRASS HEAT HYDROLYSIS HYDROXY COMPOUNDS INDUSTRIAL PLANTS LYSIS MANAGEMENT ORGANIC COMPOUNDS OXIDES OXYGEN COMPOUNDS PLANTS PROCESSING SEPARATION PROCESSES SOLVOLYSIS WASTE MANAGEMENT 090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989) 140504 - Solar Energy Conversion- Biomass Production & Conversion- = , Publication Date: Research Org.: Chem Systems, Inc., New York (USA) OSTI Identifier: 6010145 Report Number(s): SERI/STR-231-1745 ON: DE83009108 DOE Contract Number: AC02-77CH00178 Resource Type: Technical Report Resource Relation: Other Information: Portions are illegible in microfiche products. The ethanol costs reported are therefore much greater than would be achieved in an optimized system. more ยป Instead it was configured to include a large number of processing steps, not all of which would be included in the same plant, in order to provide a basis for the coding of a simulation program. The system described in the report was not optimized. Elimination of the lignin solvent extraction step and the prefermentation sugar concentration steps are recommended to reduce both the capital investment and energy usage of the plant. The prime costs are heat generation, pretreatment, and hydrolysis. Capital and operating costs estimates are developed for the plant, and the total plant cost is estimated to be $236 million. The unreacted solids and various waste streams are either burned or sent to the waste pond. The ethanol is recovered by a distillation process, and the carbon dioxide is cleaned and liquified. The sugar solution from the prehydrolysis and hydrolysis sections is neutralized and fermented to carbon dioxide and ethanol in a train of continuous fermenters. The crystalline cellulose is hydrolyzed in the hydrolysis reactor. In the pretreatment section, the raw corn stover undergoes steam explosion, the lignin is extracted by ethanol extraction, and the amorphous five- and six-carbon sugars removed in prehydrolysis. The process can be divided into six sections: pretreatment, hydrolysis, fermentation, purification, carbon dioxide recovery, and heat generation and waste treatment. This report presents a flow sheet for a cellulose-to-ethanol plant utilizing high-temperature dilute acid hydrolysis.
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