Info Cld
Adapted from Stumborg et al. 1993 . Densities of 0.920 and 0.790 t m3 are used for feedstock oils and products. Product yield is 80 wt of the feedstock used. Operating time is 320 days year feedstock consumption is 23,552 t year, production is 23,850,126 L year, and annual gross revenue at an assumed product sales price of S0.211 L is 5.03 million. All dollar values are converted from Canadian dollars in the original reference to U.S. dollars by a factor of 1.1875 CanAJ.S. , the exchange rate...
Info Cud
The data are from Stevens 1994 . Some data were not available. bcf. O'Neil, Kovac, and Gorton 1990 . The data are from Stevens 1994 . Some data were not available. bcf. O'Neil, Kovac, and Gorton 1990 . energy values. The carbon analyses and energy values are much lower and the oxygen analyses are much higher for the pyrolytic oils than for the PERC and LBL oils. This might be expected, since a synthesis gas atmosphere is used to carry out the PERC and LBL processes. The lower yield of oil from...
Iv Forestry Residues
Forestry residues consist of slash left on the forest floor following logging operations stems, stumps, tops, foliage, and damaged trees that are not merchantable and wood and bark residues accumulated at primary wood manufacturing plants during production of lumber. Underground tree roots can also be included in the list of forestry residues. The difficulty of accurately assessing the amounts of forestry residues that are and can be realistically collected and utilized as waste biomass for an...
Iii Conversion Chemistry
Basically, the chemistry involved in the conversion of natural biomass liquids to conventional motor fuels depends on whether the resulting products are for compression-ignition diesel-fueled or spark-ignition gasoline-fueled engines. Diesel fuels as already discussed preferably have normal paraffinic structures or properties. One of the reference fuels is n-hexadecane it has a cetane number of 100. This does not mean, however, that diesel fuels consist entirely of normal paraffinic...
VI Wfb
to convert a relatively limited number of feedstocks from petroleum or natural gas, or primary derivatives of these feedstocks. It is perhaps unexpected that most of the organic chemicals listed in Table 13.1 are produced by thermochem-ical processes that were discovered and perfected many years ago, from about 1915 to 1965. The advances incorporated into each process since then have resulted primarily from improved process controls, reactor designs, and unit operations such as distillation,...
Info Mjw
the BTX with aluminosilicate catalysts. Molecular sieve HZSM-5 and similar shape-selective catalysts exhibited high selectivities for toluene, the xylenes, and other alkylated benzenes. An alternative approach to BTX from biomass discovered in the 1980s employs fast pyrolysis of woody biomass in methane atmospheres methanolysis rather than hydrogen Steinberg, Fallon, and Sundaram, 1983 . Preliminary studies of the methanolysis of dry fir wood particles in the presence of silica flour at 1 to...
B
with bagasse moisture content, 166-168 Benzene, toluene, xylenes feedstock, see BTX synthesis Biochemical pathways CAM biomass, 60 C3 biomass, 58 C4 biomass, 59 celluloses, 61 hemicelluloses, 61 lignins, 61 proteins, 62 terpenes, 63-65 triglycerides, 62 Biocrude oil economics, 370, 371 productivity barriers, 354 recovery methods, 366, 368 Biodiesel fuels, 335-344 see also Triglycerides Liquefaction, natural ASTM specifications, 337, 338 catalytic hydroconversion, triglycerides, 374 cetane...
II SOURCES A Glycerides
Natural glycerides have been investigated as alternative fuels for the compression-ignition engine since the late 1800s. Rudolph Diesel, the inventor of the engine that bears his name, demonstrated a diesel-cycle engine fueled with peanut oil in 1900 at the Paris Exposition. In 1912, Diesel wrote The use of vegetable oils may become in the course of time as important as petroleum and the coal tar products of the present time. This obviously has not happened, since the majority of heavy-duty...
REFERENCES Jzm
Adams, R. P. 1982 . In Energy From Biomass and Wastes VI, D. L. Klass, ed. , p. 1113. Institute of Gas Technology, Chicago. Adams, R. P., Balandrin, M. F Hogge, L Craig, W and Price, S. 1983 . J. Am. Oil Chem. Soc. 60 7 , 1315, July. Adams, R. P., Balandrin, M. F., and Martineau, J. R. 1984 . Biomass 4, 81. Anonymous 1992 . Chem. Eng. 99 5 , 21. Auld, D. L., Peterson, C. L., and Korus, R. A. 1989 . In Energy From Biomass and Wastes XII, D. L. Klass, ed. , p. 1187. Institute of Gas Technology,...
Aromatics From Wood Catalytic Pyrolysis
CH CH - CH2 CHCH CH2 H20 4 Ethanol is the key reactant in Eq. 1 , and also in Eq. 2 because it is readily converted to acetaldehyde. The process based on Eq. 1 was developed in Russia and the process based on Eq. 2 was developed in the United States. The yield of butadiene for the Russian process is about 30-35 . It is about 70 if mixtures of ethanol and acetaldehyde are employed as in the U.S. process. Equation 3 represents a process that involves 2,3-butylene glycol, a product from the...
Biomass Excess Air
FIGURE 7.1 Theoretical flame temperature vs wood moisture content and excess air. Adapted from Tewksbury 1991 . strong energy source, decompose to form pyrolysis products, which also burn in the gas phase with flaming combustion. The residual char burns at a lower rate by surface oxidation or glowing combustion. The cellulosics are converted mainly to combustible and noncombustible volatiles, including water and C02, while the lignins contribute mainly to the char fraction. The temperature...
I INTRODUCTION Qti
As discussed in Chapter 7, the final products of biomass combustion are C02, water, and energy. This is the case, of course, for the combustion of all organic matter. It is not known how much time passed after the utility of biomass combustion was discovered by man until biomass pyrolysis was discovered. But when it was, it is probable that a new era in biomass usage evolved, and quite rapidly. Biomass pyrolysis can be described as the direct thermal decomposition of the organic components in...
C Early IBPCS Assessments
Detailed assessments of conceptual, large-scale IBPCSs were first carried out in the United States in the 1970s. Most of the early studies focused on electricity and SNG production. In one study, a conceptualized biomass plantation consisted of the multicropping of several biomass species, which entailed the integration of planting and harvesting schedules of annuals and perennials to achieve the greatest yields possible while affording a continuous, year-round supply of harvested biomass Alich...
Info Bgd
Ghosh and Klass 1978 . The feed was 90 activated biosolids and 10 primary biosolids from the Metropolitan Sanitary District of Greater Chicago. The vessel sequence was a 10-L complete-mix, stirred tank reactor CSTR acid-phase digester, an effluent storage vessel, and a 10-L CSTR methane-phase digester. The higher heating value of the dry charge was 26.0 to 27.9 MJ kg. Ghosh and Klass 1978 . The feed was 90 activated biosolids and 10 primary biosolids from the Metropolitan Sanitary District of...
REFERENCES Gol
Alich, J. A., Jr., and lnman, R. E. 1974 . Effective Utilization of Solar Energy to Produce Clean Fuel, Final Report, June 1974, under Grant 38723 Initiated May 1, 1973. National Science Foundation, Washington, D.C. Anonymous, 1983 . The New Jari Project in Brazil Is It Technically Viable , The Newjari Risks and Prospects of a Major Amazonian Development, Olsen's Agribusiness Report 4 8 , 1,4, February. Appel Consultants, Inc. 1993 . Strategic Analysis of Biomass and Waste Fuels for Electric...
A Feedstock Composition Impacts
As alluded to in Chapter 8, the ideal biomass feedstock for thermal conversion, whether it be combustion, gasification, or a combination of both, is one that contains low or zero levels of elements such as nitrogen, sulfur, or chlorine, which can form undesirable pollutants and acids that cause corrosion, and no mineral elements that can form inorganic ash and particulates. Ash formation, especially from alkali metals such as potassium and sodium, can lead to fouling of heat exchange surfaces...
Kelp Thermal Diagram
FIGURE 12.8 Diagram of young adult giant brown kelp plant Macrocystis pyrijera . From Leese 1976 . A, holdfast B, primary stipe C, stubs of frond D, sporophyil cluster E, juvenile frond F, senile frond G, stipe bundle H, apical meristem. No root involved plant takes all nutrients direct from surrounding water. FIGURE 12.8 Diagram of young adult giant brown kelp plant Macrocystis pyrijera . From Leese 1976 . Other estimates indicated that the anaerobic digestion of anchored giant brown kelp...
B Direct Chemical Liquefaction
One of the more innovative low-temperature, low-pressure, thermochem-ical techniques of directly liquefying biomass in water involves the use of 57 wt aqueous hydriodic acid HI , the azeotrope boiling at 127 C Douglas and Sabade, 1985 . When treated at 127 C with the azeotrope in a stoichiometric excess of 1.6 to 3.8 of the amount required for complete reduction, cellulose is rapidly hydrolyzed and converted to hydrocarbon-like molecules. The yields reach 60 to 70 at reaction times as short as...
Info Lmv 1
''Data from Decision Resources and Pfizer, Inc. ''Data from Decision Resources and Pfizer, Inc. feed supplement in the Americas and the large U.S. demand for fermentation ethanol as an oxygenate in motor gasolines. There is only a small U.S. demand for monosodium glutamate. Gluconic acid is not included in Table 13.1 because annual U.S. production is smaller than the production of the lower ranked chemicals in this table. The ionophores and several other specialty products are included in Table...
A Methanol
As described in Chapter 8, pyrolytic conversion of woody biomass was used to manufacture methanol wood alcohol for many years until it was displaced by thermochemical processes that involved gasification to afford intermediate synthesis gas, which is a mixture of hydrogen and carbon oxides, followed by catalytic reduction of the carbon oxides to methanol. In a typical world-scale methanol plant, synthesis gas is produced by steam reforming of natural gas feedstock and shift conversion of CO to...
Finnland Kemira Oy Gasification
Adapted from Graham and Huffman 1981 . The gasifier was rated at 0.84 GJ h. efficiency is cool gas energy dry wood energy . efficiency is cool gas energy dry wood energy . shut down, dismantled, or placed on standby. A survey of commercial thermal biomass gasification showed that few gasifiers have been installed in the United States Miles and Miles, 1989 . Most of the units in use are retrofitted to small boilers, dryers, and kilns. The majority of the existing units operate at rates of 0.14...
Chi
positions in molecules that offer several sites. Recent advances appear to provide solutions to the problem of synthesizing oligosaccharides c . Rouhi, 1996 . New oligomers and biopolymers are expected to result from this effort. Commodity lignin chemicals and their salts and derivatives are complex mixtures of compounds obtained from the spent liquors of the wood pulping industry. As previously described, the three basic pulping processes are the sulfite, sulfate kraft , and caustic soda...
III SIZE REDUCTION A Fundamentals
Reduction in physical size is often required before biomass is used as a fuel or feedstock. Size-reduction techniques are employed to prepare biomass for direct fuel use, fabrication into fuel pellets, cubes, and briquettes, or conversion. Smaller particles and pieces of biomass reduce its storage volume, facilitate handling of the material in the solid state and transport of the material as a slurry or pneumatically, and sometimes permit ready separation of components such as bark and...
Iv Miscellaneous Liquefaction Methods
A. Aqueous and Non-aqueous Non-pyrolytic Conversion Note that the transformations described here, which take place in an aqueous or non-aqueous liquid medium that may or may not react with the biomass feedstock, are termed nonpyrolytic processes, as compared to pyrolysis processes in which the biomass feedstocks are directly heated. The direct conversion of cellulosic materials to liquids by heating in aqueous systems has been known for more than 100 years c . Ostermann, Bishop, and Rosson,...
O Tsg
FIGURE 8.5 Process schematic for atmospheric flash pyrolysis of wood chips present technology. FIGURE 8.5 Process schematic for atmospheric flash pyrolysis of wood chips present technology. FIGURE 8.6 Process schematic for pressurized solvent liquefaction of wood chips present technology. FIGURE 8.6 Process schematic for pressurized solvent liquefaction of wood chips present technology. TABLE 8.15 Comparative Economic Analysis of Flash Pyrolysis and Pressurized Solvent Liquefaction Fixed...
Calculation of Fossil Fuel Reserves Depletion Times
The model used for these calculations assumes that the annual growth rate of fuel consumption, P X 10 2 , is constant. The reduction in the amount of reserves, R, then corresponds to a compounded fuel consumption. If the baseline annual consumption is C
c Uff
Calvin-Benson cycle, see C3 biomass Calvin cycle, see C, biomass CAM biomass, 60, 65 see also Photosynthesis abundance, 60 characteristics, 60 biochemical intermediates malic acid, 60 oxaloacetic acid, 60 phosphoenolpyruvic acid, 60 examples, 60 species, 60 Carbon dioxide atmospheric, 22, 34 build-up, 22 compensation point, 58 emissions biomass 34 carbon dioxide, 22, 34 carbon equivalents, 34 methane equivalents, 34 primary sinks, 33 errors and uncertainties, 33, 35 sources, 34 fossil fuel...
II METHANE FERMENTATION A Early Work on Microbial Methane
The chemistry of methane, the simplest organic compound known, was first studied by Berthollet in 1786 cf. Roscoe and Schorlemmer, 1878 . He analyzed the gas quantitatively, but could not distinguish it from ethylene. This was literally the beginning of thousands of independent investigations of methane conducted over the next 200 years. The biological origin of methane, however, was recognized by Van Helmont, Volta, and Davy long before Berthollet's studies cf. McCarty, 1982 . In 1630, Van...
REFERENCES Yqw
Anonymoous 1971 . In Biological Waste Treatment, R. P. Canale, ed. , p. 85. Interscience Publishers, New York. Arnon, D Mitsui, A., and Paneque, A. 1961 . Science 134 3488 , 1425. Backmeyer, D. P. 1947 . Sewage Worfes 19 1, 48. Balch, W. E., Fox, G. E., Magrum, L. J., Woese, C. R and Wolfe, R. S. 1979 . Microbiol. Rev. 43, 260. Barcelona, M., Gerard, V., Kuwabara, J., Lieberman, S., Manley, S., and North, W. J. 1979 . In 3rd Annual Biomass Energy Systems Conference Proceedings, The National...
I Plf
-O ,-1 y-O O -1 HOCH -o O N- -O O CH2OH FIGURE 3.6 Chemical structures of some biomass components. be separated into two fractions by treatment with hot water a soluble component called amylose 10 to 20 and insoluble amylopectin 80 to 90 . Amylose and amylopectin have molecular weight ranges of 10,000 to 50,000 and 50,000 to 1,000,000, respectively. Both fractions yield glucose or maltose on hydrolysis, but amylopectin is believed to consist of branched chains. Starches occur in the form of...
Ii History Of Alcohol Motor Fuel Development
A review of the historical development of ethanol usage as a motor fuel is in order before discussion of modern production technologies. The history dates back to the beginnings of the internal combustion engine. In an industrial chemistry book published about a century ago Duncan, 1907 , these statements appear One of the most interesting developments of the past decade has been that of the internal combustion engine. . . . The question of profitably substituting in these engines alcohol for...
Info Spx
Aerobacter aerogenes Bacillus polymyxa Klebsiella oxytoca K. pneuminiae Aspergillus niger Saccharomycopsis lipolytica Agrobacterium sp. Alcaligenes faecalis Lactobacillus brevis Lactobacteriacaeace dextranicum Leuconostoc mesenteroides Kluyveromyces sp. Candida utilis Saccharomyces cerevisiae Zymomonas mobilis III. Biomass as Feedstock for Synthetic Organic Chemicals TABLE 13.6 Continued Indigo' Isocitric acid Isopropyl alcohol Itaconic acid a-Ketoglutaric acid Kojic acid Lactic acid Glucose...
IV DENSIFICATION A Fundamentals
Baling has long been used to densify hays, straws, and other agricultural crops such as cotton to simplify removal from the field and to reduce storage space and transportation costs. Baled straw has a density of 70 to 90 kg m3 at 10 to 15 wt moisture content, whereas the bulk density of piled straw is about 5 to 15 of this density range. When straws are compressed to form pellets, briquettes, or cubes in specially designed dies and presses, the density can be increased to 350 to 1200 kg m3. In...
REFERENCES Bqz
Antal, M. J., Jr., and Varhegyi, G. 1995 . Ind. Eng. Chan. Res. 34 3 , 703. Antal, M. J., Jr., Croiset, E Dai, X., DeAlmeida, C., Mok, W. S., Norberg, N., Richard, J., and Majthoub, M. 1996 . Energy amp Fuels 10 3 , 652. Appell, H. R Fu, Y. C., Illig, E. G., Steffgen, F. W and Miller, R. D. 1975 . Conversion of Cellulosic Wastes to Oil, U.S. Bureau of Mines Report Invest. 8013. Washington, D.C. Bagrova, R. K and Kozlov, V. N. 1958 . Trudy Ural'skogo Lesotekhnicheskogo Instituta 12 97. Bain, R.,...
Info Mdu
Adapted from Nielsen et al. 1977 . ''Analysis from University of California, Los Angeles others from Berkeley. Successively extracted for 8 h with acetone and then 8 h with benzene. ''Other terpenoids. Adapted from Nielsen et al. 1977 . ''Analysis from University of California, Los Angeles others from Berkeley. Successively extracted for 8 h with acetone and then 8 h with benzene. ''Other terpenoids. the dry plant weight . The insoluble residue from the methanol extraction, 65 of the plant dry...
Losses
FIGURE 6.1 Boiler efficiency and losses due to bagasse moisture content. Stack gas temperature 450 K. with the product gas Bircher, 1982 . These problems were attributed to large variations in the quality of the gas caused by accepting wood feedstock at any moisture content up to 50 wt , which in turn resulted in large swings in gas heating values from about 3 to 8 MJ m3 about 80 to 200 Btu ft3 . Drying of the feedstock has been found to be extremely important in wood gasification because it is...
J
cf. Wiley, 1953 . Kinetic studies show that the rate of the reaction is directly proportional to both acid and xylose concentrations, and thus is at least a second-order process. The reaction is industrially significant because it made the furans available on a large scale from biomass feedstocks such as corn cobs, oat hulls, and rice hulls. The reactivity of the furan ring as a diene and in acid to form carbonium ions introduces a wide range of synthesis options. The two principal furans from...