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Sunday, April 19, 2020 | History

3 edition of study in the oxidation of Kraft black liquor. found in the catalog.

study in the oxidation of Kraft black liquor.

  • 225 Want to read
  • 19 Currently reading

Published in [Gainesville] .
Written in English

    Subjects:
  • Oxidation.,
  • Air -- Pollution.,
  • Paper industry.

  • The Physical Object
    Paginationviii, 140 l.
    Number of Pages140
    ID Numbers
    Open LibraryOL23649211M
    OCLC/WorldCa11020771

      A study was performed to evaluate the catalytic activities of cobalt oxide for oxidation of benzyl alcohol in liquid phase, using toluene as solvent. Benzaldehyde and benzoic acid were identified as the reaction by: Nanocellulose is a term referring to nano-structured cellulose. This may be either cellulose nanocrystal (CNC or NCC), cellulose nanofibers (CNF) also called nanofibrillated cellulose (NFC), or bacterial nanocellulose, which refers to nano-structured cellulose produced by bacteria.. CNF is a material composed of nanosized cellulose fibrils with a high aspect ratio (length to width ratio). The strong black liquor from the multiple-effect evaporator system is either oxidized in the black liquor oxidation system, or routed directly to a non-direct contact evaporator (also called a concentrator). Oxidation of the black liquor prior to evaporation in a direct contact evaporator reduces emissions of odorous total reduced sulfur compounds. Book Chapters. J. A. Colwell, B. N Effect of Black Liquor Oxidation on the Stress Corrosion Cracking Susceptibility of Selected Materials, Corrosion, Vol. 62, No. 9, pp Corrosion concerns related to firing petroleum coke with black liquor in kraft recovery boilers, TAPPI Engineering Conf. Portland, OR, Paper # , Aug ,


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study in the oxidation of Kraft black liquor. by Peter Mauro Ricca Download PDF EPUB FB2

Efficiency (about 97%) give the kraft process an advantage over other pulping processes. In the kraft process, about half of the wood is dissolved, and together with the spent pulping chemicals, forms a liquid stream called weak black liquor (Figure 1).

The weak black liquor is separated from the pulp by washing. The Kraft black liquor is physicochemically characterised, with the determined high values of pH, conductivity and lignin content (, mS cm⁻¹ and g dm⁻³, respectively.

Get this from a library. A fundamental study of the reaction between kraft black liquor and nitrobenzene. [William Robert Csellak]. In kraft recovery boiler operation,fly ash or dust generated from black liquor combustion study in the oxidation of Kraft black liquor.

book mixed with the virgin black liquor in a mix tank and returned to the boiler with the as-fired black liquor.

The remaining solution, including the wash water, is termed black liquor. Black liquor comprises an Manuscript received 12 June ; in amended form 1 November S.

Kannan and R. Kelly integral part of the chemical recovery cycle in the kraft pulping process After concentration by evaporation of water, it is burned to Cited by: 9.

Recovery boiler is the part of Kraft process of pulping where chemicals for white liquor are recovered and reformed from black liquor, which contains lignin from previously processed wood.

The black liquor is burned, generating heat, which is usually used in the process or in making electricity, much as in a conventional steam power invention of the recovery boiler by G.H. Tomlinson. In the past, MeadWestvaco Corporation was the largest study in the oxidation of Kraft black liquor.

book producer of kraft lignin, but Domtar Corporation started kraft lignin production with a large capacity from black liquor in NC, USA, in 68, 69 LignoBoost technology is utilized at Domtar and produces roughly 25 tons of lignin per year. 70 In this method, the addition of.

The spent pulping liquor, called kraft black liquor, contains about half the mass of the dissolved wood substances and most of the pulping chemicals. The dissolved wood material has a significant heating value, and the pulping chemicals are used to produce new white liquor, which is of great economical and environmental importance.

The LignoForce process, which entails acidification of black liquor with carbon dioxide, includes an oxidation step, the purpose of which is to chemically transform any of the odoriferous reduced sulfur compounds to their corresponding oxidized forms, which are not volatile; this also reduces the amount of acid (carbon dioxide) required for the.

Stable Free Radicals in Lignin and Lignin Oxidation Products CORNELIUS STEELINK Chapter 5, DOI: /bach Publication Date (Print): January 1, Abstract. After the kraft or soda pulping of lignocellulosic materials to produce pulp suitable for papermaking, the spent pulping liquor typically has been recovered by multi-effect evaporation, followed by incineration in a study in the oxidation of Kraft black liquor.

book boiler. The black liquor was supplied by the pulping and papermaking laboratory of Beijing Forestry University. The Kraft-AQ pulping of Eucalyptus pellita was performed in a stainless steel batch reactor using 17% w/v Na 2 O, 20% w/v Na 2 S, and % w/v AQ in a liquor/wood ratio of /L (g/g).

The initial temperature was 80 °C, and heated at the Cited by: A Study in the oxidation of Kraft black liquor. mill scale oxidation using pure oxygen was discussed. The possibilities of eliminating pulp mill odors with ozone was also investigated. Through this paper the relative importance of the parameters-controlling black liquor oxidation has been established.

The study in the oxidation of Kraft black liquor. book liquor, that by this time has turned dark brown from the dissolved lignin (black liquor), is returned to the chemical recovery cycle, In the chemical recovery plant, the lignin in the black liquor is burned for the cogeneration of energy, and the chemicals are recovered, purified, reconstituted.

Kraft lignin (byproduct of the Kraft cooking process) was isolated from the black liquor to study and optimize the experimental conditions for its enzymatic polymerization. Lignin polymerization was used as binder in the manufacture study in the oxidation of Kraft black liquor. book medium density fiberboards (MDF) with no synthetic : Susana Gouveia, Diego Moldes.

At most kraft mills today, black liquor is burned in Tomlinson boilers to produce steam for on-site heat and power and to recover the inorganic chemicals for reuse in the process. Globally, the black liquor generation rate is ab MW{sub fuel} (or million tonnes of dry solids per day), with nearly 50% of this in North America.

@article{osti_, title = {Combustion properties of Kraft Black Liquors}, author = {Frederick, Jr, W J and Hupa, M}, abstractNote = {In a previous study of the phenomena involved in the combustion of black liquor droplets a numerical model was developed.

The model required certain black liquor specific combustion information which was then not currently available, and additional data were. Araújo JD () Production of vanillin from lignin present in the Kraft black liquor of the pulp and paper industry.

PhD thesis, University of Porto Google Scholar Araújo JDP, Grande CA, Rodrigues AE () Structured packed bubble column reactor for continuous production of vanillin from kraft lignin by: 1. As kraft black liquor presents an alkali medium, BCD depolymerization of lignin can be carried out similarly to isolated lignin in order to obtain small phenolic compounds.

A direct comparison for the conversion of solid soda lignin and soda black liquor revealed a higher conversion degree for black by: 1.

A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage is operated to remove sulfide while the second stage is operated to oxidize a significant fraction of the remaining oxidizable sulfur compounds to sulfate.

The resulting selectively oxidized white liquor products are used as alkali sources for various process steps in Cited by: Cooking liquor (white liquor) for the kraft process is produced from smelt generated in the recovery boiler.

Quick lime is slaked in the smelt solution (green liquor) producing white liquor and calcium carbonate (lime mud). The calcium carbonate is calcined in a lime kiln to produce quick lime.

The lime mud is washed to reduce it’s chemical. Kraft lignin can be extracted from black liquor (i.e., spent liquor) of a kraft pulping process to produce value-added chemicals, but its limited water solubility hampers its end-use applications.

The main objective of this study was to investigate the sulfomethylation of kraft lignin to produce water-soluble kraft lignin with an anionic charge by: The present research work aimed at hydrolytic treatment of kraft black liquor (KBL) at – °C for the production of low-molecular-weight depolymerized kraft lignin (DKL).

Various process conditions such as reaction temperature, reaction time, initial kraft lignin (KL) substrate concentration, presence of a catalyst (NaOH), capping agent (phenol) or co-solvent (methanol) were by: 3.

12 Figure A schematic depiction of the combustion of black liquor in a typical recovery boiler furnace [7]. Black liquor Kraft black liquor is the spent liquor from the process of pulping wood with an aqueous solution of NaOH and Na2S.

High amounts of black liquor are generated from bioethanol production by using oil palm empty fruit bunches. The black liquor is waste from alkaline pretreatment, it contains high amount of an alkaline solution (NaOH).

The black liquor wastewater was highly contaminated with organic materials, and quite toxic for aquatic ecosystems if discharged directly into waters. This study aimed to Author: Muryanto Muryanto, Ummu Hanifah, Feni Amriani, Ahmad Faiz Ibadurrahman, Ajeng Arum Sari.

An "oldie but goodie" from the Electron Machine archives. In The Institute of Paper Chemistry wrote a paper titled "Instrumentation Study - Black Liquor Solids Content" detailing a comparison between an Electron-Machine Corporation refractometer and an NUS Corporation sonic velocimeter and their respective capability of measuring black liquor solids.

Cell wall of various plants contains an organic polymer lignin. Lignin makes significant structural constituents that support of vascular plants tissues, some types of algae and makes plants stiff and woody.

Chemically lignin composed of cross-linked phenolic polymers and Kraft lignin dissolved in the unsaturated resin system. Lignin is a vastly available and well-studied : Zahed Mahmood, Muhammad Yameen, Muhammad Jahangeer, Muhammad Riaz, Abdul Ghaffar, Irum Javid.

In its Second Edition, Handbook of Pulping and Papermaking is a comprehensive reference for industry and academia. The book offers a concise yet thorough introduction to the process of papermaking from the production of wood chips to the final testing and use of the paper product.

Vanillin production from chemical oxidation of Pinus spp. Kraft lignin is investigated. At a temperature of °C, an oxygen partial pressure of 3 bar, a total pressure of 9 bar, and a lignin concentration of 60 g/L in an alkaline medium of 2 N NaOH, a maximum vanillin yield of 10% is obtained.

On the basis of experimental results in a batch reactor operated under various conditions of Cited by:   In its Second Edition, Handbook of Pulping and Papermaking is a comprehensive reference for industry and academia.

The book offers a concise yet thorough introduction to the process of papermaking from the production of wood chips to the final testing and use of the paper product.3/5(1). The aforementioned phosphorus surface complexes, in the form of COPO 3, CPO 3 groups, which remain very stable at relatively high temperatures confer to carbons a high oxidation resistance (Wu and Radovic, ; Rosas et al.,).We have recently reported a detailed study on the oxidation resistance of these phosphorus-containing ACs obtained among others materials, from Alcell lignin Cited by: Eta reed kraft black liquor prepared by using spent liquor as diluent during cooking also showed higher viscosity and low swelling volume ratio.

From extrapolation it was observed that about 10 20% spent liquor when mixed with eta reed kraft black liquor on dry solids basis will have reasonable viscosity level and swelling volume. You can write a book review and share your experiences.

Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them., Free ebooks since The technique revealed that black liquor oxidation and a ''chlorine scrubber" reduced the odor threshold of recovery flue gas by approximately one power of 10 and by two powers of 10, respectively.

These data showed a correla- tion between the concentration of sulfur compounds present in the test gases and the observed odor thresholds.

CONTENTS - Continued Chapter Page 9 BLACK LIQUOR OXIDATION Weak Black Liquor Oxidation—Air Strong Black Liquor Oxidation—Air Agitated Air Sparging Combination Systems Molecular Oxygen Systems Process Effects Air Pollution Effects Oxidation Tower Emissions Process Economics.

Find many great new & used options and get the best deals for Handbook of Pulping and Papermaking by Christopher J. Biermann (, Hardcover, Revised) at the best online prices at eBay.

Free shipping for many products. We claim: 1. A method for the selective oxidation of white liquor in a pulp mill using the kraft wood pulping process, said method comprising: (a) contacting an unoxidized white liquor feed stream comprising sodium sulfide, sodium hydroxide, and water with a first oxygen-rich gas stream in a first reaction zone at a temperature between about ° F.

and about ° F. utilizing an oxygen. A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage is operated to remove sulfide while the second stage is operated to oxidize a significant fraction of the remaining oxidizable sulfur compounds to sulfate.

The resulting selectively oxidized white liquor products are used as alkali sources for various process steps in Cited by: 9. The 4th Nordic Wood Biorefinery Conference book of proceedings contains numerous examples of industrial and academic views on these ap-proaches for wood-based biorefining.

The organisers of the NWBC wish to warmly thank all Effect of black liquor type and lignin fractionation on the polymerisation of a Kraft. Alen, R. (), “Swelling behaviour of Kraft black liquor and its organic constituents”, Bioresource Technology, 49, Black Liquor Combustion Improves Boiler Operation”, International Chemical Recovery Influence of a pre-oxidation stage on the char characteristics”, J.

of Analytical and Applied Pyrolysis, File Size: KB. Black Liquor Gasification (BLG) is a first pdf its kind to guide chemical pdf, students, operators of paper plants, technocrats, and entrepreneurs on practical guidelines and a holistic techno-enviro-economic perspective applicable to their future or existing projects based on the treatment of black liquor for energy production.

BLG describes the gasification process as a more efficient. Laccase/mediator bleaching of kraft pulps: identification of mediator active species download pdf their role in oxidation of residual lignin subunit; pp.

A–A [ Google Scholar ] Brouwers G.J., de Vrind J.P., Corstjens P.L., Cornelis P., Baysse C., Jong E.W. cumA, a gene encoding a multicopper oxidase, is involved in Mn 2+ oxidation in Author: Adarsh Kumar, Ram Chandra.13 DFT study of an inner-sphere mechanism in the hydrogen ebook from a hydroxycyclopentadienyl ruthenium hydride to imines.

Timofei Privalov, Joseph S. M. Samec, Jan-E. Bäckvall, Organometallics,26, 12 Mechanistic Study of Hydrogen Transfer to Imines from a Hydroxycyclopentadienyl Ruthenium Hydride. Experimental Support for a.