scholarly journals Chemical Characterization and Enzymatic Control of Stickies in Kraft Paper Production

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 245
Author(s):  
Lourdes Ballinas-Casarrubias ◽  
Guillermo González-Sánchez ◽  
Salvador Eguiarte-Franco ◽  
Tania Siqueiros-Cendón ◽  
Sergio Flores-Gallardo ◽  
...  
Keyword(s):  
Liquid Fraction ◽  
Paper Industry ◽  
Chemical Characterization ◽  
Dioctyl Phthalate ◽  
Future Research ◽  
Infrared Spectrometry ◽  
Recycled Paper ◽  
Kraft Paper ◽  
Uv Lamp ◽  
Lipase Specificity

Paper recycling has increased in recent years. A principal consequence of this process is the problem of addressing some polymeric components known as stickies. A deep characterization of stickies sampled over one year in a recycled paper industry in México was performed. Based on their chemical structure, an enzymatic assay was performed using lipases. Compounds found in stickies by Fourier-transform infrared spectrometry were poly (butyl-acrylate), dioctyl phthalate, poly (vinyl-acetate), and poly (vinyl-acrylate). Pulp with 4% (w/w) consistency and pH = 6.2 was sampled directly from the mill once macrostickies were removed. Stickies were quantified by counting the tacky macrostructures in the liquid fraction of the pulp using a Neubauer chamber before the paper was made, and they were analyzed with rhodamine dye and a UV lamp. Of the two commercial enzymes evaluated, the best treatment condition used Lipase 30 G (Specialty Enzymes & Biotechnologies Co®, Chino, CA, USA) at a concentration of 0.44 g/L, which decreased 35.59% of stickies. SebOil DG (Specialty Enzymes & Biotechnologies®) showed a stickies reduction of 21.5% when used at a concentration of 0.33 g/L. Stickies in kraft paper processes were actively controlled by the action of lipases, and future research should focus on how this enzyme recognizes its substrate and should apply synthetic biology to improve lipase specificity.

scholarly journals Chemical Characterization and Enzymatic Control of Stickies in Kraft Paper Production

2019 ◽  
Author(s):  
Lourdes Ballinas-Casarrubias ◽  
Guillermo González-Sánchez ◽  
Salvador Eguiarte-Franco ◽  
Tania Siqueiros-Cendon ◽  
Sergio Flores-Gallardo ◽  
...  
Keyword(s):  
Liquid Fraction ◽  
Paper Industry ◽  
Chemical Characterization ◽  
Dioctyl Phthalate ◽  
Future Research ◽  
Infrared Spectrometry ◽  
Recycled Paper ◽  
Kraft Paper ◽  
Uv Lamp ◽  
Lipase Specificity

Paper recycling has increased in recent years. A principal consequence of this process is the problem of addressing polymeric components known as stickies. A deep characterization of stickies sampled over one year in a recycled paper industry in México was performed. Based on their chemical structure, an enzymatic assay was performed using lipases. Compounds found in stickies by Fourier-Transform Infrared spectrometry were poly (butyl-acrylate), dioctyl phthalate, poly (vinyl-acetate), and poly (vinyl-acrylate). Pulp with 4% consistency and pH=6.2 was sampled directly from the mill once macro stickies were removed. Stickies were quantified by counting the tacky macrostructures in the liquid fraction of the pulp using a Neubauer chamber before the paper was made, and they were analyzed with rhodamine dye and a UV lamp. Of the two enzymes evaluated, the best treatment condition used Lipase 30G at a concentration of 0.44 g/L, which produced a 35.59% decrease in stickies. SebOil DG showed a smaller stickies reduction of 21.5% when used at a concentration of 0.33 g/L. Stickies in kraft paper processes were actively controlled by the action of lipases, and future research should focus on how this enzyme recognizes its substrate and should apply synthetic biology to improve lipase specificity.

Deinking of recycled paper by coupling of the enzyme endo-β-1,4-D-glucanasa and the cellulose, and by using a laboratory flotation column

MRS Advances ◽  
2020 ◽  
Vol 5 (52-53) ◽  
pp. 2669-2678
Author(s):  
Jeovani González P. ◽  
Ramiro Escudero G
Keyword(s):  
Amino Acids ◽  
Sodium Hydroxide ◽  
Paper Industry ◽  
Computational Simulation ◽  
Cellulose Fibers ◽  
Residual Water ◽  
Chemical Reagent ◽  
Recycled Paper ◽  
Flotation Column ◽  
Hydrolysis Of

AbstractDeinking of recycled office (MOW) paper was carried out by using a flotation column and adding separately sodium hydroxide, and the enzyme Cellulase Thricodema Sp., as defibrillators.The de-inked cellulose fibers were characterized according to the standards of the paper industry, to compare the efficiency of the deinking of each chemical reagent used to hydrolyze the fibers and defibrillate them.The computational simulation of the molecular coupling between the enzyme and cellulose was performed, to establish the enzyme-cellulose molecular complex and then to identify the principal amino-acids of endo-β-1,4-D-glucanase in this molecular link, which are responsible for the hydrolysis of the cellulose.Experimental results show the feasibility to replace sodium hydroxide with the enzyme Cellulase Thricodema Sp., by obtaining deinked cellulose with similar optical and physical properties.The use of the enzyme instead of sodium hydroxide avoids the contamination of the residual water; in addition to that, the column is operated more easily, taking into consideration that the pH of the system goes from alkaline to neutral.

KINETIC EVALUATION AND PROCESS PERFORMANCE OF A PILOT GAC-SBBR SYSTEM TREATING RECYCLED PAPER INDUSTRY WASTEWATER

2012 ◽  
Vol 11 (4) ◽  
pp. 829-839 ◽  
Author(s):  
Siti Rozaimah Sheikh Abdullah ◽  
Mohd Hafizuddin Muhamad ◽  
Abu Bakar Mohamad ◽  
Rakmi Abdul Rahman ◽  
Abdul Amir Hasan Kadhum
Keyword(s):  
Paper Industry ◽  
Process Performance ◽  
Recycled Paper ◽  
Kinetic Evaluation ◽  
Industry Wastewater

scholarly journals Green Activity-Based Costing Production Decision Model for Recycled Paper

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2413 ◽  
Author(s):  
Chu-Lun Hsieh ◽  
Wen-Hsien Tsai ◽  
Yao-Chung Chang
Keyword(s):  
Mathematical Programming ◽  
Programming Model ◽  
Paper Industry ◽  
Labor Cost ◽  
Production Model ◽  
Theory Of Constraints ◽  
Carbon Equivalent ◽  
Activity Based Costing ◽  
Recycled Paper ◽  
Green Production

Using mathematical programming with activity-based costing (ABC) and based on the theory of constraints (TOC), this study proposed a green production model for the traditional paper industry to achieve the purpose of energy saving and carbon emission reduction. The mathematical programming model presented in this paper considers (1) revenue of main products and byproducts, (2) unit-level, batch-level, and product-level activity costs in ABC, (3) labor cost with overtime available, (4) machine cost with capacity expansion, (5) saved electric power and steam costs by using the coal as the main fuel in conjunction with Refuse Derived Fuel (RDF). This model also considers the constraint of the quantity of carbon equivalent of various gases that are allowed to be emitted from the mill paper-making process to conform to the environmental protection policy. A numerical example is used to demonstrate how to apply the model presented in this paper. In addition, sensitivity analysis on the key parameters of the model are used to provide further insights for this research.

scholarly journals POTENCY OF SOLID WASTE OF PAPER MILL USING RECYCLE PAPER AS FUEL

2016 ◽  
Vol 2 (02) ◽  
Author(s):  
Yusup Setiawan ◽  
Sri Purwati ◽  
Krisna Aditya Wardhana ◽  
Aep Surahman ◽  
Reza Bastari Wattimena
Keyword(s):  
Solid Waste ◽  
Deformation Temperature ◽  
Fiber Quality ◽  
Paper Industry ◽  
Solidification Process ◽  
Paper Mill ◽  
Wastewater Sludge ◽  
Initial Deformation ◽  
Recycled Paper ◽  
Total Alkali

The paper industry generates solid waste such as wastewater sludge and paper mill rejects. The rejects from recycled paper processing are varies from 5 % to 25 % dependent on the recovered fiber quality and process used in the mill. The composition of the rejects is consisted of fiber bundles, plastics pieces, foils and polystyrene containing large quantities of plastics. One of the limitations of solid waste for energy is bulky and high moisture content which is difficult to be stored, transported, and utilized. To overcome this limitation, it is needed a solidification process. Pelletizing of paper mill solid waste is one of solidification processes to ease in storing, handling, and transporting of solid waste. Experiment on solid wastes utilization in the pellet form as fuel has been carried out. Solidification process of paper mill solid waste is consisted of drying, shredding and  pelletizing processes of solid waste. Pellet of paper mill solid waste and coal and pellet of combination of rejects waste were analyzed for their proximate, mineral content of ash and ash fusion temperature (AFT) to see slagging and fouling potency. The results shows that paper mill reject contain high calorific value of 5,987 calorie/gram and low content of sulphur and ash. Ash has low content of total alkali (Na2O and K2O) and high initial deformation temperature (IDT) of 1,193oC. Mixed of 95% coal and 5% pellet of reject waste has low content of total alkali (Na2O and K2O) and high initial deformation temperature (IDT) of 1,315oC. The result  indicates low slagging and fouling potency of reject waste when it is utilized as a boiler fuel.Keywords: solid waste, sludge, rejects, pellet, fuel, slagging, fouling  ABSTRAK Industri kertas menghasilkan limbah padat seperti limbah lumpur dan limbah reject. Jumlah limbah reject dari pengolahan kertas daur ulang bervariasi dari 5% sampai 25% tergantung pada kualitas serat dan proses yang digunakan di pabrik. Komposisi limbah reject terdiri dari gumpalan serat, potongan plastik dan foil. Salah satu keterbatasan dari limbah padat untuk energi adalah ruah dan kadar air-nya tinggi yang menyulitkan dalam penyimpanan, transportasi, dan penggunaannya. Untuk mengatasi keterbatasan ini diperlukan proses solidifikasi. Pembuatan pellet dari limbah padat industri kertas merupakan salah satu proses solidifikasi untuk memudahkan dalam penyimpanan, penanganan, dan pengangkutan limbah padat. Penelitian pemanfaatan limbah padat dalam bentuk pelet sebagai bahan bakar untuk energi telah dilakukan. Proses solidifikasi limbah padat pabrik kertas terdiri dari proses pengeringan, proses pencacahan dan proses pembuatan pellet. Pellet limbah padat industri kertas dan campuran dari batubara dan pellet limbah reject diuji untuk analisis proksimat, kadar mineral abu, kadar abu dan suhu fusi abu (AFT) untuk mengetahui potensi slagging dan fouling. Hasil menunjukkan bahwa limbah reject industri kertas mengandung nilai kalor tinggi 5.987 kalori/gram dan rendah sulfur dan abu. Abu mengandung alkali total (Na2O dan K2O) rendah dan suhu deformasi awal tinggi (IDT) yaitu 1.193oC. Campuran dari batubara 95% dan pellet limbah reject 5% mengandung alkali total (Na2O dan K2O) rendah dan suhu deformasi awal tinggi (IDT) yaitu 1.315oC. Hal ini menunjukkan potensi slagging dan fouling rendah bilamana limbah reject digunakan sebagai bahan bakar boiler.Kata kunci: limbah padat, lumpur, reject, pelet, bahan bakar, slagging, fouling    

Evaluation of the Potential of Waste from Pulp Production (Grits) in its Use in Mortar: Physical and Chemical Characterization

2015 ◽  
Vol 820 ◽  
pp. 583-587
Author(s):  
Leonardo Carvalho Mesquita ◽  
Rita de Cássia S. Sant’ana Alvarenga ◽  
Carol Ferreira Rezende Santos ◽  
Adonys Natan Oliveira Alvares ◽  
Ana Augusta Passos Rezende ◽  
...  
Keyword(s):  
Paper Industry ◽  
Chemical Characterization ◽  
Pulp And Paper Industry ◽  
Kraft Process ◽  
Physical And Chemical Characterization ◽  
Absorption Determination ◽  
Potential Alternative ◽  
Physical And Chemical ◽  
Chemical Testing

The grits is an inorganic solid residue generated during the Kraft process by the pulp and paper industry, which presents in its composition the main ingredients of Portland cement. According to some authors, the grits can be classified as a non inert, non hazardous, granular solid industrial waste. With this in mind, a study was proposed with the objective of evaluating, initially, the applicability of grits in mortar, by means of physical and chemical testing. The physical evaluations were realized through the following tests: determination of bulk gravity saturated - surface - dry (SSD) and water absorption; determination of the pulverulent material content; and the determination of particle size distribution. To chemically test the grits, a reading of the metal concentrations present in the grits was realized as well as an analysis of the leaching and solubilization extracts. It was concluded that the addition of grits to mortar is a potential alternative.

scholarly journals Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4653
Author(s):  
Gonzalo Mármol ◽  
Christian Gauss ◽  
Raul Fangueiro
Keyword(s):  
Lignin Content ◽  
Barrier Properties ◽  
Production Costs ◽  
Recycled Paper ◽  
High Fiber ◽  
Kraft Paper ◽  
Layer Composite ◽  
Mechanical And Physical Properties ◽  
Cellulose Microfibers ◽  
Current Production

Cellulose nanocrystals (CNC) have attracted the attention of many engineering fields and offered excellent mechanical and physical properties as polymer reinforcement. However, their application in composite products with high material demand is complex due to the current production costs. This work explores the use of cellulose microfibers (MF) obtained by a straightforward water dispersion of kraft paper to reinforce polyhydroxyalkanoate (PHA) and polylactic acid (PLA) films. To assess the influence of this type of filler material on the properties of biopolymers, films were cast and reinforced at different scales, with both CNC and MF separately, to compare their effectiveness. Regarding mechanical properties, CNC has a better reinforcing effect on the tensile strength of PLA samples, though up to 20 wt.% of MF may also lead to stronger PLA films. Moreover, PHA films reinforced with MF are 23% stronger than neat PHA samples. This gain in strength is accompanied by an increment of the stiffness of the material. Additionally, the addition of MF leads to an increase in the crystallinity of PHA that can be controlled by heat treatment followed by quenching. This change in the crystallinity of PHA affects the hygroscopicity of PHA samples, allowing the modification of the water barrier properties according to the required features. The addition of MF to both types of polymers also increases the surface roughness of the films, which may contribute to obtaining better interlaminar bonding in multi-layer composite applications. Due to the partial lignin content in MF from kraft paper, samples reinforced with MF present a UV blocking effect. Therefore, MF from kraft paper may be explored as a way to introduce high fiber concentrations (up to 20 wt.%) from other sources of recycled paper into biocomposite manufacturing with economic and technical benefits.

Economies of the Kraft Paper Industry

1944 ◽  
Vol 22 (17) ◽  
pp. 1458-1463
Author(s):  
MARTIN WILLIAMS
Keyword(s):  
Paper Industry ◽  
Kraft Paper

scholarly journals Printability of papers recycled from toner and inkjet-printed papers after deinking and recycling processes

2017 ◽  
Vol 16 (2) ◽  
pp. 76-82
Author(s):  
Arif Karademir ◽  
Cem Aydemir ◽  
Dogan Tutak ◽  
Raja Aravamuthan
Keyword(s):  
High Efficiency ◽  
Color Change ◽  
Paper Industry ◽  
Optical Quality ◽  
Recycled Paper ◽  
High Optical Quality ◽  
Contemporary World ◽  
Before And After ◽  
Better Than

Background: In our contemporary world, while part of the fibers used in the paper industry is obtained from primary fibers such as wood and agricultural plants, the rest is obtained from secondary fibers from waste papers. To manufacture paper with high optical quality from fibers of recycled waste papers, these papers require deinking and bleaching of fibers at desired levels. High efficiency in removal of ink from paper mass during recycling, and hence deinkability, are especially crucial for the optical and printability quality of the ultimate manufactured paper. Methods: In the present study, deinkability and printability performance of digitally printed paper with toner or inkjet ink were compared for the postrecycling product. To that end, opaque 80 g/m2 office paper was digitally printed under standard printing conditions with laser toner or inkjet ink; then these sheets of paper were deinked by a deinking process based on the INGEDE method 11 p. After the deinking operation, the optical properties of the obtained recycled handsheets were compared with unprinted (reference) paper. Then the recycled paper was printed on once again under the same conditions as before with inkjet and laser printers, to monitor and measure printing color change before and after recycling, and differences in color universe. Results: Recycling and printing performances of water-based inkjet and toner-based laser printed paper were obtained. The outcomes for laser-printed recycled paper were better than those for inkjet-printed recycled paper. Conclusions: Compared for luminosity Y, brightness, CIE a* and CIE b* values, paper recycled from laser-printed paper exhibited higher value than paper recycled from inkjet-printed paper.

Sign in / Sign up

Export Citation Format

Share Document