Sobhana S.S.L.,Åbo Akademi University |
Zhang X.,Åbo Akademi University |
Kesavan L.,Åbo Akademi University |
Liias P.,Metsa Fibre Oy |
And 2 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2017
Technical composite materials derived from renewable sources are always of high importance due to cost-effectiveness and environmental concern. Cellulose, a renewable biopolymer stays constantly at the high realm in terms of valorization for functional materials, chemicals and other raw-materials. Cellulose based moisture-repellent materials have challenged the chemists in recent decade as the inherent hydrophilic nature of cellulose should be overcome by chemical modification or hydrophobic insulation. In the present study, cellulose is hydrophobized by eco-friendly stearic acid (SA) through inorganic linker/interface/sandwich material namely layered double hydroxides (LDH) for the first time as the layers have affinity to both cellulose and stearic acid at molecular level. The novel idea of utilizing the charge centres on LDH has been effectively materialized to make conjugation with hydrophobic SA and hydrophilic cellulose simultaneously. This produces an entirely new kind of hybrid material which offers not only hydrophobicity but super-hydrophobicity to cellulose network. This novel SA-LDH-CEL interfaced composite material surpasses all other materials that have been reported in the literature in terms of its water-repellency which is a mandatory requirement for water-proof packaging, thin films, paper, sorbent and sanitary materials. © 2017 Elsevier B.V.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: LCE-07-2016-2017 | Award Amount: 4.60M | Year: 2016
Medium- to large-scale bioenergy utilisation for electricity and combined industrial or district heating is predicted to increase by 160% in 2020 compared to 2010, while carbon emission quotas are becoming stricter. Finding new ways to efficiently utilise cheap and currently unused feedstocks are necessary in order to meet these challenges. Within the project Biofficiency we will investigate how to handle ash-related problems in order to increase steam temperatures up to 600C in biomass-based CHP plants, including pulverised fuel and fluidised bed systems. The major aspects are fly ash formation, the use of additives, and pre-treatment technologies for difficult fuels. This leads to highly reduced emissions, in particular CO2 and fine particulates, as well as a secure and sustainable energy production. Biofficiency gathers a unique consortium of excellent academic facilities and industrial partners, providing an exceptional platform for the development of new, highly-efficient CHP plants in order to significantly expand their potential in the fast-growing field of renewable energies. By sharing our collective experience, we will strengthen European bio-energy technologies and help solving global climate and energy challenges. The project approach addresses current bottlenecks in solid biomass combustion, namely enhanced deposit formation, corrosion and ash utilisation by a variety of new, promising technologies. Our goal is to deepen the understanding of fly ash formation, to improve current biomass pre-treatment technologies, as well as to contribute to the field of biomass ash utilisation. Through our strong collaboration with industry and academic partners, we want to pave the way for highly-efficient, low-emitting biomass CHP plants, capable of firing low-grade fuels. This benefits industry, communal partners and public authorities by providing sustainable heat and electricity at significantly decreased emissions.
Wedin H.,KTH Royal Institute of Technology |
Fiskari J.,University of Helsinki |
Kovasin K.,Metsa Fibre Oy |
Ragnar M.,Svenskt Gastekniskt Center |
Lindstrom M.E.,KTH Royal Institute of Technology
Nordic Pulp and Paper Research Journal | Year: 2012
Extended-impregnation kraft cooking (EIC) is a cooking concept that combines prolonged impregnation with modern improved modified kraft cooking. In the current investigation, the EIC cooking of birch was studied in relation to conventional kraft cooking. Specifically, the reject content and carbohydrate yield retention when terminating at a high cooking kappa number were examined. It was demonstrated that EIC cooking reduced the reject content. Unexpectedly, a high cooking kappa number led to no increase in carbohydrate yield, possibly due to the chemical composition of birch wood and the EIC cook lab procedure. A large amount of liquor was withdrawn after the impregnation, resulting in a loss of dissolved xylan that otherwise could have redeposited on the fibres and contributed to the carbohydrate yield. The effects of EIC cooking on extended oxygen delignification, bleaching chemical requirement in a D(OP)DP sequence, and strength properties were also examined. Compared with conventional lab cooking, EIC cooking resulted in a lower bleaching chemical requirement and similar strength properties.
Agency: European Commission | Branch: H2020 | Program: BBI-RIA | Phase: BBI.VC2.R2 | Award Amount: 2.41M | Year: 2015
The main objective of the PROVIDES project is to develop a radically new, sustainable and techno-economically feasible pulping technology for wood and agro-based lignocellulose raw materials based on deep eutectic solvents (DES), a new class of natural solvents which have the unique ability to dissolve and thus mildly fractionate lignin, hemicellulose and cellulose at low temperature and atmospheric pressure for further processing into high added value materials and chemicals. The aim is to transfer recent scientific findings in novel lignin dissolving DES to process concept level that can be evaluated against current pulping processes. The technological breakthrough expected through the development of such new DES pulping technology could reduce process energy intensity by at least 40% and investment costs by 50% compared to traditional chemical pulping technology. In parallel, the development of efficient novel cellulose-dissolving DES and other DESs to process lignocellulose materials, starting with paper for recycling, is aimed at with focus on sustainability in selecting DES chemical components and technical and economic applicability of the solvent system. PROVIDES will create both fundamental and industry driven technological knowledge based on lab to bench/pilot scale experimentation, through: mapping and selection of most effective DES families; investigating processes and process technology options, including DES regeneration and recycling, in order to define full industrial processes that would isolate high quality cellulose/fibres, lignin and hemicelluloses; providing products for industrial evaluation; establishing technical data to evaluate industrial feasibility and integration; performing life-cycle oriented assessment of environmental and socio-economic performance; assessing impacts in terms of energy and cost reductions as well as new high added value applications PROVIDES could provide to the pulp and paper industry sector.
Agency: European Commission | Branch: H2020 | Program: BBI-RIA | Phase: BBI.VC2.R4 | Award Amount: 2.41M | Year: 2015
SmartLi aims at developing technologies for using technical lignins as raw materials for biomaterials and demonstrating their industrial feasibility. The technical lignins included in the study are kraft lignins, lignosulphonates and bleaching effluents, representing all types of abundant lignin sources. The raw materials are obtained from industrial partners. The technical lignins are not directly applicable for the production of biomaterials with acceptable product specifications. Therefore, pretreatments will be developed to reduce their sulphur content and odour and provide constant quality. Thermal pretreatments are also expected to improve the material properties of lignin to be used as reinforcing filler in composites, while fractionating pretreatments will provide streams that will be tested as plasticizers. Lignin is expected to add value to composites also by improving their flame retardancy. The development of composite applications is led by an industrial partner. Base catalysed degradation will be studied as means to yield reactive oligomeric lignin fractions for resin applications. The degradation will be followed by downstream processing and potentially by further chemical modification aiming at a polyol replacement in PU resins. Also PF type resins for gluing and laminate impregnation, and epoxy resins will be among the target products. Full LCA, including a dynamic process, will support the study. The outcome of the research will be communicated with stakeholders related to legislation and standardisation.
Rantamaki J.M.,Metsa Fibre Oy |
Rantamaki J.M.,VTT Technical Research Center of Finland
Journal of Quality in Maintenance Engineering | Year: 2015
Purpose-This paper deals with the identification and diagnosis of operational variability in chemical processes, which is a common problem in mills but little explored in literature. The Cross-Industry Standard Process for Data Mining (CRISP-DM) is a widely used approach in problem solving. The purpose of this paper is to: first, contribute to the body of knowledge on applying CRISP-DM in a pulp mill production process and the special issues that need to be considered in this context. Exact amounts of a cost increase due to variation in pulp production have not been reported previously. Second, to quantify the cost of variation. Design/methodology/approach-In the case studied, the variation in a pulp mill batch cooking process had increased. In order to identify the causes of variation, CRISP-DM was applied. Findings-The cycle of variation was identified and found to be related to the batch cooking process cycle time. By using information from this analysis it was possible to detect otherwise unobserved defective steam nozzles. The defective equipment was repaired and improved. Further improvement was achieved when the fouling of a heat exchanger was found by analysis to be the root cause of long-term variability parameters. By applying CRISP-DM, equipment defects and fouling were identified as the root causes of the higher manufacturing costs due to increased variation were detected and estimated. The Taguchi loss function is a possible tool for estimating the cost of variation in pulp manufacturing. Originality/value-This paper provides new knowledge in the context of implementing CRISP-DM and the Taguchi loss function in the pulp and paper manufacturing process. © Emerald Group Publishing Limited 1355-2511.
Isokangas A.,University of Oulu |
Ala-Kaila K.,University of Oulu |
Sorsa A.,University of Oulu |
Ohenoja M.,University of Oulu |
Leiviska K.,Metsa Fibre Oy
Nordic Pulp and Paper Research Journal | Year: 2014
The objective of this work was to develop a log loading simulator of the wood room in pulp and paper industry. In the first stage the log loading process is modelled. Then the criteria for evaluating the effects of log loading on the wood room performance are defined. The motivation for the research is that log loading can be identified as playing a central role if the production and cost-effectiveness of the wood room is to be increased. The lack of reliable process measurements and changes in raw material quality, which are not measured on-line, make the data-based modelling of an industrial log loading process difficult. For these reasons, the research was performed via mathematical modelling of the process. The simulated results confirm that the same production can be obtained in many ways, but there can be differences in costs. Especially too high speed of the infeed conveyor in relation to capacity leads to several drawbacks, which typically result in increased wood loss and decreased chip quality. For this reason it is important to consider all aspects of log loading for the best performance. The results give insight into the log loading process and may help to improve the log loading process.
Ramark H.,Andritz Group |
Piira J.,Andritz Group |
Hirvonen K.,Metsa Fibre Oy |
Poukka O.,Metsa Fibre Oy
PEERS Conference 2015: Sustainable Solutions for Our Future | Year: 2015
Wood is the biggest variable cost for pulp maker and especially the yield of softwood with today's kraft pulping technology is quite low. This paper discusses new possibilities to improve pulp yield. ANDRITZ has developed technology and processes to enhance pulp yield in cooking and in brown stock treatment. The following A-yield processes are covered: Thin chip and high kappa cooking, polysulfide cooking, displacement washing with DD- washers, strong oxygen delignification and screen room location after oxygen delignification. For polysulfide cooking, mill experience is also explained.
Metsa Fibre Oy | Date: 2012-06-22
A method of defibring lignocellulose-bearing raw material with a polysulphide-bearing cooking liquor in a continuous digester. According to the present invention, cooking liquor is mixed into the raw material which is to be defibred before the cooking, and the cooking liquor is allowed to absorb into the raw material at a temperature which is at maximum approximately 130 C. After that, cooking liquor used for the absorption is separated from the raw material which is treated in this way, the separated cooking liquor is heated to a temperature of approximately 140-170 C., after which the generated hot cooking liquor is mixed back into the treated raw material, possibly together with a fresh feed of cooking liquor fresh feed, and the raw material is defibred by means of the hot cooking liquor in a continuous digester in order to generate pulp which has a desired kappa number. Thus, in the cooking stage, alkaline cooking liquor which was originally dosed into the absorption process, and only the temperature of which was increased, is used; liquor to be absorbed is not removed, nor is any fresh liquor fed into the cooking, or if it is, only small amounts of it.
Metsa Fibre Oy | Date: 2013-04-15
A method of separating hemicellulose and cellulose by dissolution of hemicellulose from a hemicellulose-rich source, such as a pulp of any origin or from holocellulose. In the method, hemicellulose is dissolved in a solvent system comprising a cellulose solvent, which is either a ionic liquid or another direct cellulose solvent, and a molecular solvent (co-solvent), wherein said co-solvent does not dissolve cellulose, and wherein the solvent basicity and acidity of said ionic liquid or other direct cellulose solvent are adequately adjusted by the co-solvent. The present invention enables quantitative separation of cellulose and hemicellulose without any depolymerization and yield losses as occurring during conventional dissolving pulp manufacturing processes.