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  • In the BioDME project a synthesis plant was designed and erected downstream an existing pressurized black liquor gasifier pdf-file The synthesis plant consists of acid gas removal units methanol reactors and a DME synthesis unit About 4 ton of BioDME per day can be produced in the plant...

  • desilication of agro-based BL Desilication of Black Liquor BL obtained from paper production using agricultural residues contains additional silica which causes serious problems at filtration washing evaporation burning recausticizing and clarification levels of chemicals recovery Partial desilication is achieved by raw material cleaning...

  • A concentrated aqueous black liquor containing carbonaceous material and alkali metal sulfur compounds is treated in a gasifier vessel containing a relatively shallow molten salt pool at its bottom to form a combustible gas and a sulfide-rich melt The gasifier vessel which is preferably pressurized has a black liquor drying zone at its upper part a black liquor solids gasification zone...

  • The solubilities are also temperature dependent In pilot plant tests involving several species of nonwood plants careful carbonation with a bubble reactor of black liquor containing 6 g/L silica followed by filtering in a filter press resulted in 90 of the silica being removed as...

  • This invention relates to a continuous process of removing silica from spent pulping liquors black liquors which have been obtained by the alkaline digestion of annual plants such as bamboo bagasse reed and straw wherein said liquor is treated with CO 2-containing gases and the precipitated silica is separated It is known that for a removal of silica from silica-containing alkaline...

  • PDF Black liquor obtained from agricultural residues and used as raw material for paper production contains additional silica which causes serious Find read and cite all the research...

  • Apr 01 2012 0183 32 The precipitation of lignin from the black liquor was initially studied with a single step process in which dilute acid solution was added to the black liquor to adjust the pH of it to the desired final pH value In the single-step process 1000 mL of the black liquor was taken in...

  • Feb 01 1998 0183 32 TEST APPARATUS AND EXPERIMENTALPROCEDURESimilar laboratory test rigs have been used to investigate the in 175 uence of operating conditions on the foulingbehaviour of both Kraft black liquor and Bayer liquor Asimpli® ed schematic of the test rigs is shown in Figure 6Detailed information is given in the literature 4 5...

  • Pilot plant for desilication of black liquor The technology is being upscaled for demonstration on Pilot scale Established test procedure for determination of lignosulphonate purity Identified and developed lignin purification technique to improve its performance as feedstock for clean energy and other industrial applications...

  • No natural purging mechanism exists in the black liquor gasifier Alternative methods for control of accumulation of non-process elements will be studied in this project WP8 Material investigation in Hot Green liquor Swedish Corrosion Institute In pressurized black liquor gasification the green liquor temperature can be as high as 220ºC which...

  • amounts of black liquor carryover into the bleach plant In Mini-O the tempera-ture is often increased in an E O stage resulting in lesser amounts of capital investment but also lower levels of delig-nification 7 Chakar et al 8 studied Mini-O technology and found it to be promisingTheir work found high kappa pulps and low kappa pulps...

  • The present invention relates to a method and apparatus for intensifying an alkaline pulping process in which a soap-containing fraction is separated from black liquor and treated further in order to separate fibers from the fraction prior to further treatment of the soap-containing fraction by evaporation or by cooking it to form tall oil...

  • Pilot plant studies on partial desilication of 250 m3/day of liquor by venturi absorber showed 90 efficiency in China4 Gruen5 investigated lime desilication at elevated temperature using excess of lime up to 6 times of stoichiometric quantity Jayme6 modified the process using semi-concentrated black liquor 30 solids and reduced...

  • A small-scale test program of 65 solids black liquor gasification was conducted in the bench-scale molten salt gasifier Nine tests were performed using both air and oxygen as the oxidant The black liquor gasified readily and the product gas had a dry-basis heating value of 70 Btu/scf with air and about 250 Btu/scf with oxygen...

  • Nov 02 2013 0183 32 In this study the impact of black liquor shocks on multiple stage biological treatment plant was studied The tests were carried out in a lab scale plant and using a mathematical simulation model The results showed good relation to a parallel situation at the Gruvön Mill The MultiBio concept is persistent to short-term black liquor spills...

  • DESILICATION OF BLACK LIQUOR PILOT PLANT TESTS October 1988 After modifications to the system the pilot plant obtained desilication efficiencies of more than 90 percent On the basis of...

  • BLACK LIQUOR CIRCULATING PUMP Fig 4 General pilot plant installation arrangement Fig 5 Flooded-disc scrubber schematic 624 demister outlet for determination of over-all system efficienci Results and Analysis of Scrubber Tests Figure 6 shows the results of flooded-disc scrubber tests on the raw salt cake fume as it leaves the recovery...

  • Desilication of agro based black liquor and green liquor using jet loop reactor pilot plant scale using a disc mill and achieved 50 removal of silica Partial desilication of BL is achieved by storing ageing 4 at elevated temperature where silica together with some lignin precipitat...

  • This gasification technology is currently under operation in a 3 MW pilot plant at Chemrec s test facility in Pite 229 Sweden Chemrec was a Stockholm Sweden corporation that developed technology for entrained flow gasification of black liquor and certain types brown liquor for production of biofuels from the resulting syngas...

  • The Royal Institute of Technology in conjunction with CleanFlow Black AB has developed a method for preparing lignin from kraft black liquor using ultrafiltration Keyoumu et al 2004 Helander et al 2013 Presently a pilot plant is under evaluation and thus a novel type of technical lignin...

  • Around 7 desilication is achieved at pH 254 Below pH 254 there is only marginal improvement in desilication efficiency Residual silica content is 4 gpl at this pH and 3 gpl at pH levels to 7 Optimum pH range for silica precipitation in rice straw black liquor is 254 177...

  • pilot plant tests TAPPI J 71 1988 139 9 Chemical recovery plant for small pulp mills using non-wood Desilication of black liquor is achieved by carbonation effecting delignification...

  • The aluminum concentration in black liquor produced from the cooking phase was below 10 μg/mL with desilication agents in the range of 009 wt to 065 wt The RSD obtained from ICP-AES measurements was below 05225 indicating that the ICP-AES technique is a satisfactory method to determine the aluminum content in bamboo pulp black liquor...

  • The purpose of this research is to study the effect of aluminum desilicating agents on the viscosity of thick black liquor its isothermal volume expansion coefficient VIE and desilication rate with an expectation to provide some data and basic theories of aluminum salt for pilot plant testing of the alkali recovery system...

  • Full Article Efficient Desilication by Adsorption with Aluminum Salt-modified Bentonite from Green Liquor Tao Lin a Xue Li a Yongjian Xu a b c Xuefeng Yin a Dingjun Zhang c and Yong Tian c The objective of this work was to investigate the possibility of using Na-bentonite as a raw material to produce aluminum salt-modified bentonite AlMB for desilication of green liquor...

  • Black liquor is a complex colloidal system obtained by chemical pulping processIt comprises of lignin nearly 50 of the total organic and Silica approx2-3 OD basis of the total inorganic componentsBlack liquor is fed to chemical recovery plant where silica causes scales in the channels and concentrators Mechanism of silica precipitation...

  • The testing results of the green liquor are shown in Table 1 Table 1 Composition of Green Liquor from Wheat Straw Pulping Desilication of the Green Liquor The green liquor was desilicized by the one-step carbon dioxide precipitation method reported earlier Xia et al 2013 Then the desilicized green liquor was mixed with the original...

  • Jun 01 2020 0183 32 Silica was separated from the black liquor by reducing its pH to 7 by dilute sulfuric acid H 2 SO 4 addition The separated silica from the black liquor of the two-stage KOH pulping was 132 for rice straw and 78 for wheat straw In our previous study 104 silica was precipitated from the black liquor of KOH pulping of rice straw 1b...

  • article osti_1001224 title = Mill Integration-Pulping Stream Reforming and Direct Causticization for Black Liquor Recovery author = Heiningen Adriaan van abstractNote = MTCI/StoneChem developed a steam reforming fluidized bed gasification technology for biomass DOE supported the demonstration of this technology for gasification of spent wood pulping liquor or black liquor at...

  • May 25 1982 0183 32 Precipitation of silica from black liquor with sodium aluminate as in Example II is further demonstrated 05 liter of 185 solids black liquor containing 32 grams SiO 2 is agitated with 100 ml of white liquor in which had been dissolved 23 gm Al 2 O 3 by digestion with bauxite...

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