Pyrolysis oils from CO2 precipitated Kraft lignin

A common goal in present and future forestry, biofuels and biomaterials practices, is the need to valorize lignocellulose processes to maximize value and optimize autonomic economy. Consequently, a key focus of modern biorefining is the on-site utilization of all residual materials generating products of the highest possible value. The LignoBoost process, recently demonstrated on the pilot-scale at Kraft pulp mills, injects CO(2) into pulping liquors which results in a lower solution pH and thereby precipitates lignin. The present paper compares and evaluates the pyrolysis of pulping liquor lignins precipitated by sulfuric acid (pH 3) and the aforementioned CO(2) method (pH 10.5 and 9.5). The CO(2) based process yielded lignin that showed superior pyrolysis properties including low gas formation and increased bio-oil yields, close to 40%, consisting primarily of low (similar to 150 g mol(-1)) molecular weight compounds. Subsequent NMR analysis showed that the oils exhibit favorable changes in functionalities, e. g. loss of aromatic and gain in aliphatic carbon percentages as well as decrease in carboxyl and methoxyl (oxygen containing) groups. Moreover, NMR results further confirmed previously hypothesized lignin pyrolysis reactions, while at the same time showed the potential of CO(2) precipitated lignin for pyrolysis and subsequent liquid biofuel production

Annual program review chemical recovery, March 6-7, 2000

"March 6-7, 2000."v. 1. Project F028-01,-02. Black liquor gasification development / J. Frederick ... [et al.] ; Project F028-03. Catalytic destruction of tars / Kristina Iisa, Viboon Sricharoenchaikul ; Project F032. Control of evaporator fouling / Wolfgang Schmidl, Maribeth Amundsen ; Project F033-02. Control of non process elements / P. Pfromm, W. Schmidl, J. Frederick ; Project F033-03. Methanol formation/emission / J.Y. Zhu, X.S. Chai, Garry Heedick ; Project F03303/ or F01708 (Previously) report 5. Volatile organic compounds (VOCs) in kraft mill streams - Henry's law constant of methanol in pulping spent liquors / J.Y. Zhu and X.S. Chai ; Project F03303/ or F01708 (previously) report 6. Volatile organic compounds (VOCs) in kraft mill streams - Methanol formation during alkaline wood pulping / J.Y. Zhu and X.S. Chai ; Project F03303 (previously F01708) report 7. Volatile organic compounds (VOCs) in kraft mill streams - The fate of hexenuronic acid groups during alkaline pulping of Southern pine / J.Y. Zhu ... [et al.] ; Project F033-05. In-digester odor reduction. Part I. Analysis of volatile organic sulfur compounds in kraft liquors by full evaporation headspace gas chromatography / J.Y. Zhu ... [et al.] ; Project F033-05 report 2. In digester odor reduction. Part II. In-digester odor reduction in kraft pulping / J.Y Zhu, X.S. Chai, and J. Li -- v. 2. Project F034. Electolytic causticizing of kraft smelt / P. Pfromm ... [et al.] ; Project F035. ATR sensor for on-line kraft liquor analysis / J.Y. Zhu, X.S. Chai, J. Li ; Project F038-01, -02. Fume deposition and hardening / Steve Lien, Jim Frederick, Josefina Lindblom ; Project F03801, F03802. Sintering of recovery boiler dust - the influence of the composition of the dust / Josefina Lindblom ... [et al.] ; Project F03801, F03802. Mechanisms of hardening of sodium salt deposits in the boiler bands of kraft recovery boiler / Wm. James Frederick ... [et al.] ; Project F038-03. Black liquor devolatilization kinetics / Kristiina Iisa, Scott Sinquefield, Qun Jing ; Project F038-04. Sulfation of fume particle in recovery boilers / Kristiina Iisa, Scott Sinquefield, Qun Jing ; Project F038-05. Heavy metals emissions from recovery boilers / Kristiina Iisa, Qun Jing ; [Project unnumbered] Fate of nitrogen in the chemical recovery process / Nikolai DeMartini -- Slide material