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  • 1.
    Ahlroth, Mikael
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Bialik, Marta
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy. RISE, Innventia.
    Jansson, Mikael
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy. Andritz, Sweden.
    Rosenqvist, Kristian
    ÅF, Sweden.
    Bark and wood powder firing in the recovery boiler for maximum power generation2017In: International chemical recovery conference, May 24-26, 2017, Halifax, Canada, PAPTAC , 2017Conference paper (Refereed)
    Abstract [en]

    The effect of co-firing bark or wood powder in a recovery boiler is studied. The effect of increased NPEs in the liquor and lime cycles, the FMT and sticky dust and the smelt composition is assessed by using simulation tools. The results indicate that generating an additional 22-39% HP steam for power production by firing wood powder in the recovery boiler is a viable option, if Cl and K are purged from the ESP dust by a treatment unit. The smelt is enriched with the same proportion of NPEs as the as-fired liquor.

  • 2.
    Ahlroth, Mikael
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Bialik, Marta
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Jensen, Anna
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Hydrothermal carbonisation of effluent sludge2017In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 156-158Conference paper (Refereed)
    Abstract [en]

    Research was carried out to investigate hydrothermal carbonisation (HTC) treatment of different effluent sludges from the pulp and paper industry in a Parr-reactor. Sludge samples were evaluated from a thermomechanical paper (TMP) mill and a kraft market pulp mill (NSWBK). The issues studied included HTC treatment time; addition of acid and alkali; dewatering properties of the resulting slurry; and non-process element (NPE) concentration in the original sludge, the filtrate and the filter cake. It was found that HTC improved the fuel quality. Alkali metals were depleted in TMP and NSWBK sludge and in both cases, the sludge was easier to dewater. The yield was better for TMP than NSWBK sludge and the yield losses had a negative impact on the NSWBK sludge. TMP sludge was already a viable boiler fuel and the treatment improved the fuel qualities even more. The HTC treatment of the NSWBK sludge resulted in lower chlorine and potassium, with lower fuel-nitrogen resulting in lower nitrous oxide. Although HTC treatment improved the low heating value of the sludge, this was counteracted by yield loss. Compared with untreated NSWBK, the overall energy impact was negative. HTC treatment offered mixed opportunities from the viewpoint of the recovery cycle.

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  • 3.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Björklund Jansson, Marianne
    RISE, Innventia.
    Törngren, Per
    RISE, Innventia.
    Influence of wood extractives on calcium balance during kraft cooking2014Conference paper (Refereed)
  • 4.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Hoffstedt, Christian
    RISE, Innventia.
    Björklund Jansson, Marianne
    RISE, Innventia.
    Samuelsson, Åsa
    RISE, Innventia.
    Wadsborn, Rickard
    RISE, Innventia.
    Increasing the availability of the kraft pulp mill by the use of process simulation2012Conference paper (Refereed)
  • 5.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Jensen, Anna
    RISE, Innventia.
    Ahlroth, Mikael
    RISE, Innventia.
    New challenges regarding nonprocess elements in the liquor and lime cycle2015In: TAPPI Journal, ISSN 0734-1415, Vol. 14, no 7, p. 421-429Article in journal (Refereed)
    Abstract [en]

    Optimal performance of the green liquor plant, recausticizing plant, and lime cycle is vital for adequate white liquor availability and quality as well as for a mill's energy efficiency. Recently, various problems in the liquor and lime cycle have been frequently reported by our industrial partners, including poor performance of green liquor filters or sludge filters, decreased filterability of lime mud, increased lime kiln dead load, and poorquality white liquor. Those problems are most likely caused by an accumulation of nonprocess elements in the liquor and lime cycle due to increased mill closure, increased use of biofuels, or both. Data from the literature and earlier studies have been analyzed with regard to the occurrence and concentration of nonprocess elements in various process streams, including filtered green liquor, green liquor sludge, lime mud, and white liquor. The mineral forms in which nonprocess elements often precipitate were also studied, together with the common knowledge and rules of thumb used by mills for dealing with the problems. The literature data are compared with the newest analytical results from a sampling campaign involving several mills with varying process solutions with respect to nonprocess elements. The consequences and possible recommendations for the mills are presented. Application: Kraft pulp mills can use this information to diagnose and possibly solve problems related to nonprocess elements in day-to-day mill operation.

  • 6.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Jensen, Anna
    RISE, Innventia.
    Ahlroth, Mikael
    RISE, Innventia.
    New challenges regarding non-process elements in the liquor/lime cycle2014Conference paper (Refereed)
  • 7.
    Bialik, Marta
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Jensen, Anna
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Kotilainen, Oula
    Andritz Oy, Finland.
    Kulander, Ida
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Lopes, Marta
    RISE Research Institutes of Sweden.
    Design, optimization and modelling of a chemical recovery system for wet spinning of cellulose in sodium carbonate solutions2020In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 27, p. 8681-8693Article in journal (Refereed)
    Abstract [en]

    The aim of this study is to present the design, optimization and modelling of a chemical recovery system for a novel CS2-free viscose-type process that entails dissolution of pre-treated dissolving pulp in a continuous-flow reactor in cold alkali and wet spinning of cellulose in sodium carbonate solutions. Technologies already known to other industries for the recovery and reuse of chemicals, such as causticizing, recalcination, recarbonization and freeze-separation, were used. Chemical equilibria simulations were performed with OLI Studio 9.5, with the purpose to select experimental conditions which avoid undesired precipitations in each unit operation. Synthetic solutions mimicking the spent coagulation liquor were used in the laboratorial experiments. The proposed chemical recovery system was shown to be technically feasible and reduce chemical make-ups to a minimum of 45 kg/ton of NaOH and 4 kg/ton of H2SO4. Small amounts of Zn are expected to precipitate during recarbonization of the coagulation liquor at 30 °C and causticizing at 98 °C. Thus, a filter for ZnO particles should be included in the design of the recarbonization unit and a continuous purge of lime mud and input of fresh lime make-up should be needed to keep burnt lime availability at an acceptable level. Overall, the results presented in this study portray a solution to reduce operating costs and the environmental impact of novel viscose-type processes with alkaline spin dopes and wet spinning of cellulose in sodium carbonate solutions. © 2020, The Author(s).

  • 8.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Jensen, Anna
    RISE, Innventia.
    Kulander, Ida
    RISE, Innventia.
    Scaling of manganese in kraft pulping process2014Conference paper (Refereed)
  • 9.
    Bialik, Marta
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Jensen, Anna
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Rahman, Haribur
    Chalmers university of technology, Sweden.
    Langer, Vratislav
    Chalmers university of technology, Sweden.
    Na2CO3-Na2SO4-double salt scaling in black liquor evaporators: solubility experiments in model solutions2017In: International chemical recovery conference, May 24-26, 2017, Halifax, Canada, 2017Conference paper (Refereed)
    Abstract [en]

    Scaling by Na2CO3-Na2SO4-type solids counts among the most common problems in black liquor evaporation. Previous studies have identified two double salts precipitating from Na-CO3-SO4 solutions: burkeite, Na2CO3·2Na2SO4 and (sodium sulphate) dicarbonate, Na2SO4·2Na2CO3. The latter is believed to be more prone to cause scaling. However, it has long been suspected that other double salts, with largely unknown properties, may form in this system. This work summarizes the results of precipitation studies in the Na2CO3-Na2SO4-(additive) system targeting the transition zone between burkeite and dicarbonate formation. At least one additional double salt has been identified by X-ray diffraction in both bulk crystals and in the scale. The solubility data and the equilibrium liquor compositions have been compared with earlier models

  • 10.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Moosavifar, A.
    Sedin, M.
    Theliander, H.
    Using the pitzer method to estimate the boiling point rise in black liquor solutions2009In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 2, p. 172-182Article in journal (Refereed)
    Abstract [en]

    The boiling point rise (elevation) of aqueous industrial solutions is often of significant importance for the design of process conditions, equipment, heat balances, etc. However, few rigorous methods exist for predicting boiling point elevation in complex, multicomponent, electrolyte solutions. An example of such a solution is the black liquor obtained in kraft pulp production: a complex mixture of organic and inorganic ions including Na +, K + OH -, HS - C0 3 2- S0 4 2- S 20 3 2- CH 3COO - various phenolates and many more. This work shows one application of the semi-empirical Pitzer method to the theoretical prediction of the boiling point rise in industrial black liquor solutions. The values of the boiling point elevation were measured in two series of black liquors from representative Swedish mills, including both the original and lignin-lean black liquor at different solid contents. The results show a good agreement between experimental and predicted values at low to moderate solid content, and good qualitative prediction at high solid content.

  • 11.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Sedin, Maria
    Theliander, H.
    Application of the pitzer method in estimating the properties of black liquor solutions: A summary2010In: International Chemical Recovery Conference, 2010, Vol. 2, p. 16-23Conference paper (Refereed)
    Abstract [en]

    The Pitzer method for calculating activity coefficients in aqueous electrolyte solutions has been widely applied to modeling the properties of numerous industrial systems. Its use in hot, concentrated solutions, an example being black liquor from kraft pulping process, has nevertheless been limited mainly due to a lack of suitable interaction parameters. This paper summarizes our work in implementing the Pitzer method into modeling of double salt solubilities and boiling point rise in industrial black liquors. Two solubility models: for burkeite, Na 2Co 22Na 2S0 4 and for (sodium sulfate) dicarbonate, 2Na 2CO 3Na 2S0 4 were developed based on literature and experimental data, respectively. Boiling point rise was modeled in two types of black liquor: ordinary and lignin-lean after a lignin precipitation stage. The paper also presents our study on a method for estimating new Pitzer interaction parameters in hot solutions of sodium lactate using the boiling point rise data.

  • 12.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Wadsborn, Rickard
    RISE, Innventia.
    Karlholm, Ingeli
    RISE, Innventia.
    Berglin, Niklas
    RISE, Innventia.
    Assessment of scaling risk in a pressurized black liquor gasification pilot plant2010In: International Chemical Recovery Conference, 2010, Vol. 1, p. 279-286Conference paper (Refereed)
    Abstract [en]

    Black liquor gasification is considered as an interesting alternative to the recovery boiler-based process of green liquor production. Although the handling of the smelt in the two separate processes is similar, the final concentration and temperature of the green liquor from gasification might both be higher. This, together with the S/Na split acquired by the gasification unit, may increase the risk of scaling of slightly soluble salts during green liquor handling. This work uses a previously developed solubility model for sodium carbonate, calcium carbonate and pirssonite, CaCO 3·Na 2CO 3·H 20 in order to evaluate the scaling risk in green liquor obtained from the gasification process. The model, originally based on both gasification green liquor and regular green liquor data, was verified against new samples of green liquor from an experimental gasification unit in Sweden. During the conducted sampling campaign, the following process parameters were varied in order to establish their influence on the final liquor composition: temperature and load of the gasifier, mixing rate in the smelt dissolver, and composition of the dilution water. It has been found that varying the process parameters within the normal operational limits has a relatively small influence, on the composition of the green liquor. The risk for pirssonite precipitation in gasification green liquor was estimated as relatively low, which is consistent with earlier findings. The calculated values of the apparent solubility product were also consistent with previous results.

  • 13.
    Björklund Jansson, Marianne
    et al.
    RISE, Innventia.
    Bialik, Marta
    RISE, Innventia.
    Törngren, Per
    RISE, Innventia.
    New insights into soap solubility and separation during kraft cooking2014Conference paper (Refereed)
  • 14.
    Lindgren, Karin
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Kulander, Ida
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Törngren, Per
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Bialik, Marta
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Soap separation: A new option for removal of NPEs2018In: Pulping Engineering and Environmental Recycling Sustainability Conference, PEERS 2018: Technical Solutions for Today and Beyond, TAPPI Press , 2018, p. 272-277Conference paper (Other academic)
    Abstract [en]

    Non-process elements (NPEs) are elements present in the process streams without taking part in the desired reaction. With increasing process closure and new NPE-rich input streams such as gasified bark in the lime kiln and the destruction of biosludge in the recovery boiler, the traditional purge points may prove insufficient. A new method to remove NPEs is suggested: Removal of NPEs from tall oil brine. The idea is based on the fact that many elements are enriched in the soap and separated from the black liquor but are later led back to the black liquor with the brine. The results showed strong enrichment of Ba, Ca, Mg, Mn, P and Zn in soap; an enrichment factor of 8 or higher was observed. Laboratory experiments where tall oil brine has been alkalized and subjected to a separation stage have been conducted. The laboratory experiments showed that more than 90% of Al, Ba, Mg, Mn and P precipitates and could be removed with the solid phase if alkalized to pH 11. The separation efficiency varied for Ca and Si from 70-85 %. To conclude, removal of non-process elements from tall oil brine is a promising new kidney, especially for P and Si.

  • 15.
    Lindgren, Karin
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Kulander, Ida
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Törngren, Per
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Bialik, Marta
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy.
    Soap separation: a new option for removal of NPEs2018In: Technical solutions for today and beyond: TAPPI PEERS conference, 2018, p. 154-159Conference paper (Other academic)
  • 16.
    Peterson, Anna
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Wallinder, Johan
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Bengtsson, Jenny
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Idström, A.
    Chalmers University of Technology, Sweden.
    Bialik, Marta
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    de la Motte, Hanna
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Chemical Recycling of a Textile Blend from Polyester and Viscose, Part I: Process Description, Characterization, and Utilization of the Recycled Cellulose2022In: Sustainability, E-ISSN 2071-1050, Vol. 14, no 12, article id 7272Article in journal (Refereed)
    Abstract [en]

    Material recycling requires solutions that are technically, as well as economically and ecologically, viable. In this work, the technical feasibility to separate textile blends of viscose and polyester using alkaline hydrolysis is demonstrated. Polyester is depolymerized into the monomer terephthalic acid at high yields, while viscose is recovered in a polymeric form. After the alkaline treatment, the intrinsic viscosity of cellulose is decreased by up to 35%, which means it may not be suitable for conventional fiber-to-fiber recycling; however, it might be attractive in other technologies, such as emerging fiber processes, or as raw material for sugar platforms. Further, we present an upscaled industrial process layout, which is used to pinpoint the areas of the proposed process that require further optimization. The NaOH economy is identified as the key to an economically viable process, and several recommendations are given to decrease the consumption of NaOH. To further enhance the ecological end economic feasibility of the process, an increased hydrolysis rate and integration with a pulp mill are suggested. © 2022 by the authors.

  • 17.
    Wolf, Jens
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Bialik, Marta
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Jensen, Anna
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy.
    Modelling of precipitation of silicon, aluminium and phosphorus into green liquor dregs2017In: International chemical recovery conference, May 24-26, 2017, Halifax, Canada, 2017Conference paper (Refereed)
    Abstract [en]

    A set of empirical equations is presented for modelling the precipitation of aluminium, silicon and phosphorous in green liquor plants as a function of initial concentrations of these elements plus magnesium, calcium and alkali in the dissolver. As process parameters, the model includes residence time and temperature. Concentrations, temperature and residence time have been varied according to a factor design plan. Main findings are that in laboratory experiments it was possible to remove aluminium, silicon and phosphorous down to concentrations below their solubility in white liquor thus avoiding accumulation of these elements in the lime cycle. In addition, the experimental work showed that the initial concentrations of aluminium, silicon and phosphorous in raw green liquor have a strong increasing impact on their concentrations in filtered green liquor.

1 - 17 of 17
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