Dissolution of Peat and Wood in Tetralin Compared with Coal

Hörnell, Christina; Björnbom, Pehr; Björnbom, Emislia; Bergström, Agneta; Karlsson, Goeran; Karlsson, Ola; Olsson, Bengt A.; Solantausta, Yrjö; Ahgren, B.

doi:10.1007/978-94-009-4932-4_44

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Schultz et al (1982a) have found that hydrotreating of hydrochloric acid sweetgum lignin in hydrogen donor solvents at a temperature ränge of 375-425 °C gives a maximum yield of approximately 11 wt-% monomeric phenols but the yield of both soluble and distillable (monomeric) phenols seems to decrease with a prolonged reaction time and also with a higher reaction temperature. It is also in this connection interesting and somewhat surprising to note that Hörneil et al (1985) have claimed that both wood and peat can be dissolved in tetralin already at 350 °C.…”

Section: Introductionmentioning

confidence: 91%

Liquefaction of Kraft Lignin: 1. Primary Reactions under Mild Thermolysis Conditions

Vuori¹,

Bredenberg²

1988

Holzforschung

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Primary reactions of kraft lignin liquefaction were studied under mild batch reaction conditions. Experiments using tetralin äs reaction solvent were made both neat and in the presence of a heterogeneous hydrotreating catalyst (CoMo). Thermolysis at 345°C gave only a relatively low yield of gaseous and liquid products. The maximum yield, 20.3 wt-% (dry basis), for ether soluble phenols and acids was attained when a tetralin/m-cresol mixture was used äs a solvent. The main reaction under mild thermolysis conditions is the demethylation of the methoxyl group leading to the formation of methane, and also char through condensation. The high yields of char indicate the inability of both the gas phase hydrogen and the hydrogen from the donor solvent to prevent condensation reactions. Experiments with the hydrotreating catalyst gave a higher yield of both gaseous products and char than neat thermolysis indicating an enhanced reaction of the kraft lignin. The yield of liquid products remained, however, on a low level.

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Section: Introductionmentioning

confidence: 91%

Liquefaction of Kraft Lignin: 1. Primary Reactions under Mild Thermolysis Conditions

Vuori¹,

Bredenberg²

1988

Holzforschung

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“…In these processes, the consumption of the reducing gas was low. In fact the initial conversion of wood seemed to result from the thermal destruction of the biomass which was accompanied by evolution of carbon dioxide and water with a very low consumption of hydrogen; the latter can be provided by the catalytic conversion of carbon monoxide with water in the reaction medium (Hornell et al, 1984). The liquefaction of wood has also been carried out without an initial reducing gas at the conditions already described by Boocock et al (1980), Eager et al (1982, Fredon et al (1983) and Miller and Fellows (1981).…”

mentioning

confidence: 99%

Wood liquefaction with hydrogen or helium in the presence of iron additives

et al. 1985

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The catalytic activity of several iron additives was studied during the liquefaction of poplar wood suspended in water at 340°C. Iron powder gave good oil yields of -40%. The iron seemed to be an effective additive at the beginning of the reaction before being converted into Fe304. A systematic study of the influence of the initial pressure and volumetric composition of the gas phase (hydrogen-helium mixtures) was also made. An initial pressure in the range 4.0-6.0 MPa was necessary, but the nature of the gas had no significant effect on the yield and the quality of the oils obtained when the percentage amount of iron on dry wood was at least 14%. A stoichiometric equation for the liquefaction reaction is proposed which agrees with experimental results regardless of the initial gas composition.L'activitC catalytique de plusieurs composCs a base de fer a CtC CtudiCe lors de reactions de liquefaction de bois de peuplier, dans I'eau, a 340°C. La poudre de fer conduit ti des rendements en huile d'environ 40%. C'est au dCbut de la rCaction que le fer exercerait son activitC catalytique, et serait ensuite transform6 en Fe304, non actif. Une Ctude systkmatique de l'influence de la pression initiale de gaz et de la nature de ce gaz (melanges hydrogene-hClium) a Cte faite; une pression comprise entre 4,O et 6,O MPa est nkcessaire mais la nature du gaz n'a pas d'influence sur les rendements et la qualitt des huiles obtenues, si le pourcentage de fer par rapport au bois est au moins Cgal a 14%. Une Cquation stoechiomCtrique de la reaction de liquefaction a Ct C Ctablie, elle est valable quelle que soit la nature du gaz initial.wing the energy crisis of the 1970's, people became

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Pyrolysis in Finland

Solantausta

Sipilä

1991

Biomass Pyrolysis Liquids Upgrading and Utilization

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Dissolution of Peat and Wood in Tetralin Compared with Coal

Cited by 3 publications

References 6 publications

Liquefaction of Kraft Lignin: 1. Primary Reactions under Mild Thermolysis Conditions

Liquefaction of Kraft Lignin: 1. Primary Reactions under Mild Thermolysis Conditions

Wood liquefaction with hydrogen or helium in the presence of iron additives

Pyrolysis in Finland

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