Jul 16, 1996· 2. A process according to claim 1, wherein said aqueous sulphide-containing kraft pulping solution in i) is white liquor from a kraft pulp mill. 3. A process according to claim 2, wherein said white liquor is between 0.9N and 1.3N in sodium sulphide and 2.6 to 3.9N in sodium hydroxide. 4.
PULP AND PAPER INDUSTRY. EVAPORATORS AND CONCENTRATORS are used to evaporate chemical liquor during the chemical recovery process of chemical pulping. The chemical pulping processes are the kraft, soda, sulfite, or semi chemical process. The kraft process, also known as the sulfate process, uses sodium hydroxide as the process chemical and is the most common form of pulping.
Separator (ADS). Knots are the embedded branches that break out of the stem during chipping making large, resin-soaked, curly-grained dense wood chunks that do not grind into pulp …
What's the main function of paper pulp slurry filtering solid liquid separator? Size classification: Classifying the different grade particle size as per different mesh size from the mixture materials.1-6 different size can be classified by one machine Gravity filtering: removal of solids from liquids and slurries. Product reclamation: removal of the solids from waste product or clarification ...
Kraft Pulp & Paper Industry: Heat Exchanger and Heat Recovery System Heavy Liquor Heater. Heat exchangers for heavy liquor include a shell and tube heat exchanger using indirect steam to heat liquor within the tubes. Liquor re-circulation is utilized to maintain velocity within the heat exchanger at varying boiler operating rates.
top separator. The top separator is located in the top of the digester in a single vessel system or the top of the Impregnation vessel in a two vessel system. The top separator allows the chips to be separated from the TC transfer liquor. The chips fall into the cooking vessel and the liquor …
cal pulping, the chips are fed into a large pressure cooker (digester), into which is added the appropri-ate chemicals (white liquor). The chips are then cooked (digested) with steam at specific tempera-tures long enough to separate the fibers and partially dissolve the lignin and other extractives. Some digesters operate continuously with a con-
The pulp washers separate the pulp from the spent cooking liquor. The pulp then proceeds through various stages of washing and eventually bleaching, which will be discussed later in this section. A benefit of the kraft process is that it is designed to recover the cooking chemicals and heat. Spent cooking liquor and the pulp wash water are ...
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 ...
VALVE GUIDE FOR THE PULP & PAPER INDUSTRY BULLETIN 97.01-01 MAY 2016. ... Vapor SEPARATOR Black Liquor Turpentine DECANTER DIGESTER To Sewer Water SEPARATOR Cold Water CONDENSER Warm Water Sight Glass Condensate ... The pulp (cooked fibers) is washed to remove residual liquors that will contaminate the process and also to recover the maximum ...
The separation and recovery of lignin from spent pulping liquor has emerged as a commercially viable, large-scale industrial process, for which three versions are in current industrial production (Charleston mill, LignoBoost, and LignoForce) and a fourth has been demonstrated at the pilot plant scale (SLRP).
Alfa Laval separators optimize tall oil production. Increased yield, higher product quality and a more sustainable process were some of the improvements Swedish pulp producer Södra Cell experienced when upgrading the tall oil plant in its Värö mill to ...
Vibrating Screen Separators in the Pulp and Paper Industry Kason barker effluent clarifier with floating surge dam for efficient dewatering and screening. There was a time when the pulp and paper industry thought of circular screen separators only in relation to the clarification of size and coatings. But those days are gone forever!
Alkaline pulping liquor enters with the chips in the top separator that is at the same elevation of the steam injectors. The digester wall at the elevation of the steam in serts is con structed of ...
China Polyester Spiral Press Filter Fabric for Pulp-Liquor Separator, Find details about China Polyester Spiral Press Filter Belt, Spiral Filter Cloth from Polyester Spiral Press Filter Fabric for Pulp-Liquor Separator - Shijiazhuang Huatao Import and Export Trade Co., Ltd.
Full Article. Separation and Structural Characteristics of Lignin in the Prehydrolysis Liquor of Whangee Dissolving Pulp Ruiping Tong, Chaojun Wu,* Chuanshan Zhao, and Dongmei Yu. Separation and structural characterization of lignin are essential for value-added utilization of hemicelluloses and lignin in the prehydrolysis liquor (PHL) of a kraft-based Whangee (a genus of bamboo) dissolving ...
History • Soda pulping process patented, 1854. • Soda recovery via incineration patented, 1865. • First successful soda mill, 1866. • Kraft pulping process patented by Dahl, 1884. • First commercially viable kraft mill, Sweden, 1885. • Kraft recovery furnace, 1930's.
The purpose of washing is to separate the pulp from black liquor to wash out the residual substances such as alkali-lignin produced in the cooking process, purify the pulp for the purpose of screening and bleaching, and separate the pulp from black liquor. At the same time, the pulping waste liquor with high concentration and temperature was ...
Method for separating lignin from black liquor includes the following steps: a) precipitating lignin by acidifying black liquor and thereupon dewatering, b) suspending the lignin filter cake obtained in step a) to obtain a second lignin suspension and adjusting the pH level to approximately that of the washing water of step d) below, c) dewatering of the second lignin suspension, d) adding ...
3.2-2 Different two-phase flow schemes are created in the boiling zone, including slug flow, where a slug of liquor is followed by a slug of vapor, similar to the perking in a coffee percolator; annular flow, where a ring of liquor encases a center core of vapor and liquid mist; and mist flow, where vapor blankets the tube surface. Mist flow conditions should be avoided because poor heat
Alfa Laval offers a wide range of separation equipment. Products are based on our four separation technologies: Decanter centrifuges are used in applications with large particle sizes and high concentrations of solids. Disc stack centrifuges are the preferred choice where solids concentrations are lower and particle sizes are relatively small.
Lignin recovery from spent alkaline pulping liquors using acidification, membrane separation, and related processing steps: A review Article in Bioresources 14(1):2300-2351 · February 2019 with ...
Multiple Effect Evaporator. Where plant steam is available, AHL offers multiple effect evaporator systems for services such as kraft pulp mill black liquor concentration. The technology has been the preferred choice in industries such as pulp & paper, ethanol production, ethylene glycol concentration and sugar refining.
Pulp & Paper This industry is defined by wear, contaminants, & corrosion.Valve failure seems to be a way of life and the down-time can ravage plants and brutalize business efficiency. Cornerstone Valve has solutions for your most extreme pulp and paper challenges:
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. Paper is made through the following processes: 1) Pulping procedure will be done to separate and clean the fibers. 2) Refining procedure will be followed after pulping processes
Pulp mills have used black liquor as an energy source since at least the 1930s. Most kraft pulp mills use recovery boilers to recover and burn much of the black liquor they produce, generating steam and recovering the cooking chemicals (sodium hydroxide and sodium sulfide used to separate lignin from the cellulose fibres needed for papermaking ...
Chips + Steam + Liquor Digester See Flow Chart Stock Discharge Tank 2202 – Tealon TF1580 Tealon TF1570 Black Liquor + Chips Knot Separator 2002 2774 + 2007 Brown Stock Pulp Washers 2005 2019 Tealon TF1580 Tealon TF1570 Thickening Filter (Oxygen Reactor) 2774 2774 + 2007 Black Liquor Weak Black Liquor Tank 2202 – Spiral Wound / Tealon TF1580 /
Liquor Handling. Digesters chemically pulp wood by adding white liquor to wood chips to break down and separate the wood fibers from the lignin glue that holds them together. After the digestion process is completed, the results are red liquor containing wood fibers and black liquor containing dissolved organic wood materials and alkali compounds.
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