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Pulp and Paper Manufacturing Process in the paper industry

Pulp and Paper Manufacturing Process in the paper industry Paper plays a key role in our daily life and papers have been used for many years from now. Papers are made with the pulp of the woods, which is an Eco-friendly product.

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EP0584161B1 - White liquor preparation and pulping process ...

After the digestion step, the pulp is separated from spent pulping liquor, known as "black liquor". In the normal kraft process, the cellulosic fibrous material, generally wood chips, is digested by heating with a white liquor containing sodium sulphide and sodium hydroxide to dissolve from the wood chips a substantial part of the hemicelluloses and lignin therein.

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Anaerobic digestion in the kraft pulp and paper industry ...

Kraft pulping makes up 80% of the world production of wood pulp, thus, the wastewaters from this sector represent a large unused potential for methane production. There are three main types of substrates available for AD at pulp and paper mills, the wastewaters, the primary sludge/fibre sludge, and the waste activated sludge.

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Pulp - afandpa

Chemical Pulp:Pulp obtained by digestion or cooking of wood with solutions of various chemicals. The paper produced from this pulp results in strong products that are unlikely to discolor. The principal chemical processes used are the sulfate (kraft), sulfite, and soda processes.

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Formation of Calcium Carbonate Scale and Control ...

pulp mill productivity. Scale deposition occurs in areas such as the heaters and extraction screens of continuous digesters and the liquor side of heat-transfer surfaces in the evaporators. This reduces the efficiency and control of pulping and evaporation processes and eventually forces the .

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Kraft process - Wikipedia

The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibers, the main component of paper.The kraft process entails treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S), known as white liquor, that breaks the bonds that link lignin ...

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Kraft Pulping | Yokogawa America

The kraft process (also known as kraft pulping or sulfate process) describes a technology for conversion of wood into wood pulp consisting of almost pure cellulose fibers. Wood chips are by harsh chemicals (white liquor) to produce pulp and spent liquor (black liquor). The spent liquor is later regenerated to white liquor in the causticizer.

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Bracell Dissolving Wood Pulp - Bahia Specialty Cellulose ...

Bracell is a global leader in the production of dissolving wood pulp, including specialty cellulose in Bahia, Brazil. We also produce Kraft pulp.

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Pulp sludge is green gold - PLANT - PLANT

Apr 19, 2011 · Anaerobic digestion is not a new technology, even for the pulp and paper industry. Decaying organics are eaten by WAS microbes. As they consume the decaying organics they grow, and they clean up the effluent, making it safe for environmental discharge, but during this process they grow and become a disposal problem.

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Digester Control in the Kraft Process - Emerson

The Kraft paper process is particularly efficient because it involves continuous recycling of raw mate- rials. Wood chips are delignified by harsh chemicals (white liquor) to produce pulp and spent liquor (black liquor). The spent liquor is later regenerated to white liquor in the causticizer.

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Paper Manufacturing: Kraft (Sulfate) Pulping | In-Line ...

Kraft pulp can also be used for writing paper and paperboard when bleached, and for diapers when fluffed. The three main steps involved in Kraft pulping are: Digestion: wood chips are cooked; Washing: black liquor is separated from the pulp; Chemical recovery: chemicals are recovered from the black liquor for reuse; Description of Process . Digestion ; The first step in pulping wood is to "cook" the wood chips.

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Kraft Pulping | Yokogawa America

Kraft pulping uses less than 50% of the tree. The rest ends up as sludge which is burned, spread on land or land field. Since the amount of bleach needed is related to the lignin content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction phase of the pulping process.

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Anaerobic digestion in kraft pulp and paper industry ...

kraft pulping (a chemical pulping process) makes up 80% of the world production of wood pulp, thus, the wastewater from this sector represents a large unused potential for methane production.

Fate of Residual Lignin during Delignification of Kraft ...

The structure of the residual lignin in kraft pulps is significantly different from the structure of the lignin in wood and even from the structure of dissolved kraft lignin. During kraft pulping, aryl ether bonds are depleted, condensed bonds are enriched, and links to polysaccharides are formed (3).

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Industrial Operations - Special Cellulose and Kraft Pulp ...

Bracell has a production capacity of 500,000 tons of special cellulose per year in Bahia and 250,000 tons of kraft pulp per year in São Paulo. Our factories use a highly-advanced production process to obtain high levels of purity, with an alpha-cellulose content of up to 98.5%.

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Anaerobic digestion in the kraft pulp and paper industry ...

large amounts of wastewater and sludge. Anaerobic digestion (AD) has several benefits when implemented in wastewater treatment, but due to challenges related to microbial inhibition, recalcitrant organic matter and large wastewater volumes, AD has not been regarded as an attractive option for kraft pulp and paper mills. This work

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33 PULP AND PAPER MILLS The two common forms of .

fibres, now called pulp or "brown stock," are separated from the spent cooking liquor (black liquor) in the pulp washers. The kraft process is associated with strong-smelling gases – organic sulphides – which are an environmental concern. The dilute or "weak" black liquor (10-15% solids) comes from the washers.

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Enzymatic Treatments of Pulps - Forest Products Laboratory

include the modification of pulp properties, specific removal of pulp components, and enhanced bleaching. Enzymatic treatments have been shown to improve fiber flexibility, fibrillation and drainage, and to decrease vessel picking. Xylanases can improve the quality of dissolving pulp and facilitate bleaching of kraft pulps.

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Anaerobic digestion in the kraft pulp and paper industry ...

The title of my project is "Establishing/improving biogas production in the Swedish pulp and paper industry". All Sessions of "E. Ekstrand" Anaerobic digestion in the kraft pulp and paper industry – benefits and strategies for implementation

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The chemical reactions in Kraft pulping process | pulp ...

Jun 30, 2015 · In Kraft pulping process, cooking liquor chemicals are NaOH and Na2S. Although the high percentages of sodium sulfide darken the pulp color but it has huge benefits; it increase penetration of the wood, uniform cooking, low cooking time, high yield and strength.

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