TG and DSC analyses of eucalyptus black liquor as alternative methods to estimate solids content

Leite, Brenno Santos; Andreuccetti, Melissa Tatiana; Leite, Sibele Augusta Ferreira; Dangelo, José Vicente Hallak

doi:10.1007/s10973-012-2689-4

Cited by 11 publications

(12 citation statements)

References 6 publications

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“…Black liquor is a major by-product of chemical pulp production [1]. It helps to establish economically effective pulp mills, because during the chemical recovery cycle, black liquor is used as an energy source for the pulp mills, as well as the source for inorganic process chemical recovery and reuse [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the kraft process of turning wood into wood pulp, the cellulose fibers are separated from other components during digestion in aqueous solutions of sodium hydroxide and sodium sulfide at elevated temperatures and pressure [1,2]. Expended cooking liquor is called black liquor, and it contains organic and inorganic compounds, as well as water [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, measurement of the SC is performed gravimetrically by drying at 105 • C [10] until a constant weight is reached. Although the technique is simple and robust, it is also time-consuming [2] and requires several sample preparation steps [2], such as the dilution of concentrated liquors and the addition of sand to the samples. Consequently, this gravimetric method is rarely automated or implemented in the online monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Solids Content of Black Liquor Measured by Online Time-Domain NMR

et al. 2019

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Black liquor, a valuable by-product of the pulp production process, is used for the recovery of chemicals and serves as an energy source for the pulp mill. Before entering the recovery unit, black liquor runs through several stages of evaporation, wherein the solids content (SC) can be used to control the evaporation effectiveness. In the current study, the time-domain nuclear magnetic resonance (TD-NMR) technique was applied to determine the SC of black liquor. The TD-NMR system was modified for flowing samples, so that the black liquor could be pumped through the system, followed by the measurement of the spin-spin relaxation rate, R2. A temperature correction was also applied to reduce deviations in the R2 caused by the sample temperature. The SC was calculated based on a linear model between the R2 and the SC values determined gravimetrically, where good agreement was shown. The online TD-NMR system was tested at a pulp mill for the SC estimation of weak black liquor over seven days without any fouling, which demonstrated the feasibility of the method in a harsh industrial environment. Therefore, the potential of the TD-NMR technology as a technique for controlling the black liquor evaporation process was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solids Content of Black Liquor Measured by Online Time-Domain NMR

et al. 2019

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“…Research on the BL from alkali-oxygen pulping of rice straw has mostly focused on the proportions of inorganic and organic material in the solid, which are closely relevant to its calorific value, the effect of alkalinity and suspended matter in its viscosity variation, thermolysis, and other thermal properties. ) in the temperature range from 50 to 350 °C using a a Jupiter Thermo Gravimetric Analyzer STA 449C (Netzsch, Germany) (Leite et al 2012) The inorganic and organic contents of the BL are shown in Table 2. The composition, both inorganic and organic, expressed as the mass percentage of this content to total dry solids, and SiO2, expressed as the mass percentage of this content to inorganic, were obtained from a series of (at least) two tests, with a standard deviation lower than 5%.…”

Section: Resultsmentioning

confidence: 99%

Effects of pH and Suspended Matter on the Physico-Chemical Properties of Black Liquor from Alkali-Oxygen Pulping of Rice Straw

Zhang¹

2016

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Black liquor (BL) can be regarded as the energy and alkali resource of the pulping mill. In this work, the effects of the characteristics of black liquor derived from the alkali-oxygen pulping of rice straw were studied. Through analyses of the chemical and physical properties, especially the thermodynamics properties, which depend on suspended matter and alkalinity, it was shown that the removal of the suspended matter from the black liquor could effectively improve its thermodynamic properties, particularly in making its solids content reach up to more than 56% at the turning point of its viscosity. Moreover, sodium salt played an important role in the presence of macromolecules and silica in the BL. When the BL was adjusted to pH = 11 with NaOH, the filtered BL had the lowest silica content, the highest volumetric isothermal expansivity (VIE), was more susceptibility to thermal cracking, and was more suitable for processing for alkali recovery.

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“…2. This way, it is possible to identify the kind of mass loss event explained in the TG analyses [35]. DSC main temperatures and heat of combustion (H comb ) are included in Table 3.…”

Section: Differential Scanning Calorimetric Analysismentioning

confidence: 99%