• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method of recovering chemicals from chloride-containing green liquor by precarbonating the green liquor by means of flue gases into hydrosulfide and soda, by removing hydrosulfide from the precarbonated solution in the form of hydrogen sulfide, by evaporation crystallizing the chloride- and soda-containing solution in order to separate the chloride salt from the alkaline solution. In order to reduce releases of hydrogen sulfide, the produced hydrogen sulfide is absorbed into a soda solution and/or an alkaline solution in order to produce a solution suitable for the preparation of white liquor, whereas the hydrogen sulfide which remains unabsorbed is returned to the precarbonation stage, in which the hydrogen sulfide is absorbed substantially completely. By means of the invention it is possible to achieve a closed cycle of chemicals without the chloride load of the system increasing, and at the same time the chloride is recovered and returned to the bleaching.
    公开号:SU1303040A3
    申请号:SU833657404
    申请日:1983-10-19
    公开日:1987-04-07
    发明作者:Пертти Калеви Римпи
    申请人:Ой Тампелла Аб (Фирма)；
    IPC主号:
    专利说明:

    113030402
    The invention relates to cellulose-Na2COz2.3, NaHCOj 0.9, NaHS 0.15,
    NaCl 1.6 and 0.03.
    paper industry and can be used in the production of bleached fiber semi-finished products.
    The purpose of the invention is to increase the degree of chloride recovery and reduce the Corrosiveness of the liquor.
    The essence of the invention is that according to the method of extraction At the stage of preliminary evaporation crystallization, water 6 is evaporated with an intensity of 34.8 tons / h, then, in apparatus 7, crystals of Na CO.J-BUT with intensity of 63, bkmol / h and crystals, with an intensity of 3.7 kmol / h. The obtained crystallisation of chemical substances from the containing 10 VAN solution 8 (mother liquor), green chlorine chlorides, including, contains, kmol / h: NajCOj 6.3, NaHS "it causticizes green liquor and 19.7, 0, 2 and NaCl 12.0, with the subsequent evaporating crystalline course of 6.8 m h, are sent to the separation of chlorides, the green liquor is hydrosulphurically caustised, the green liquor is treated with holes and 15 d g of the apparatus 9 i
    New gases for carbonization of the content - Hydrogen sulfide is formed in the corresponding sodium sulfide with the reaction of a solution containing solutions of low-pass liquids j. m ngp - m rosulfide sodium and sodium carbonate,, Na, (J. +
    whereupon the resulting solution is subjected to 20, for which the bicarbonate and carbonate are introduced into the preliminary evaporation d through line 10 to the first desorption crystallization with the separation of the carbononation stage with the consumption of the corresponding sodium and sodium hydrosulfide kmol / h and 7.4 kmol / h. Before the formation of parate 9, the hydrogen sulfide is separated from the solution containing sodium carbonate and hydrogen sulfide by reacting the solution with Ca of the first stage of separation in sodium bicarbonate, the resulting hydrogen sulfide is absorbed in an alkaline solution, and unabsorbed hydrogen sulfide
    sent to the stage of processing the smoke 30 o, 2 passes to the second stage ra3aNM. hydrogen sulfide 11 with a flow rate
    The drawing shows the scheme for the implementation of the method. The remaining sulphide-containing plant The method for extracting chemical thieves 12, containing, kmol / h: 17.1 substances from chlorine-containing 35, 3.6 NaHCOg, 1.1 NaHS, 0.2 the felted liquor is carried out using the following and 12 NaCl, in an amount of 9%.
    Green liquor 1 containing
    Kmol / h: Na2COz62,7; Na S 19.6; Na SO ...
    intensity 17.4 kmol / h
    From the first stage of separation of hydrogen sulfide, a solution containing, kmol / h: 17.6 NagCOj, 3.8 NaHCOg, 1.1 NaHS and
    and 4 partially passed to causticization
    13 and partially (stream 5) on the crystallization of soda in the apparatus 4.
    In the second stage of the separation of hydrogen sulfide 11, bicarbonate is directed through line 14 at a flow rate of 3.4 kmol / h. Hydrogen sulfide 11 is sent to the first stage of desorption in the apparatus 9, from where
    3.9, NaCl 10.4, served at a rate of 40.4 m / h for carbonization into apparatus 2, as well as carbon dioxide 0.5 19.6 kmol / h.
    The carbonization is carried out with flue gases in the amount of 3290. It is removed together with gaseous carbon dioxide concentration by 15, and the water vapor is condensed in the condenser 16. In apparatus 17, HjjS 15 is absorbed in an alkaline solution 18 containing 50 kmol / h NaOH, 2, 1, 0.2 and 1.4 NaCl. Unabsorbed HflS from the apparatus 17 is directed — the carbonated solution 3 —–– the preliminary carbonization is from the apparatus 2 to the preliminary apparatus 2. evaporation crystallization.
    apparatus 4; part of the bicarbonate streams 10.14 of the obtained solution 5, obtained from the stage, is removed using carbon dioxide of hydrogen sulfide in the amount of the genus from the exhaust gases in the corresponding 1.2 and containing, kmol / h: vii with reaction
    input of 12.97% and a degree of carbon dioxide absorption of 51.7% in accordance with the reaction
    2Na, S + HjjO + CO, j- 2NaHS + Na, COj
    for which, bicarbonate and carbonate are introduced via line 10 to the first desorption stage at a flow rate of 26.6 kmol / h and 7.4 kmol / h, respectively. In the first stage of separation in apparatus 9, hydrogen sulfide is separated from
    oh 2 passes to the second stage of separation of hydrogen sulphide 11 with consumption
    intensity 17.4 kmol / h
    From the first stage of separation of hydrogen sulfide, a solution containing, kmol / h: 17.6 NagCOj, 3.8 NaHCOg, 1.1 NaHS and
    thief 12, containing, kmol / h: 17.1, 3.6 NaHCOg, 1.1 NaHS, 0.2 and 12 NaCl, in an amount of 9
    and 4 partially passed to causticization
    13 and partially (stream 5) on the crystallization of soda in the apparatus 4.
    In the second stage of the separation of hydrogen sulfide 11, bicarbonate is directed through line 14 at a flow rate of 3.4 kmol / h. Hydrogen sulfide 11 is sent to the first stage of desorption in the apparatus 9, from where
    it is removed along with gaseous 15, while the water vapor is condensed in the condenser 16. In apparatus 17, HjjS 15 is absorbed in an alkaline solution 18 containing, kmol / h: 30 NaOH, 2, 1, 0.2 and 1.4 NaCl . Unabsorbed HflS from the apparatus 17 is directed - "to preliminary carbonization apparatus 2.
    NajCOj, + COy + - ZNaHCO ,.
    Stream 19, exit, search from the second stage of hydrogen sulfide separation 11, is directed to carbonization, where it is treated with waste gases 20 (58310) containing 12.97% COg. During carbonization, COj is absorbed in an amount of 13.2 kmol / h, which corresponds to 26.4 kmol / h bicarbonate.
    A portion of the solution 21 containing. 0.6 kmol / h, 0.2 kmol / h NaHCO2, from the second stage of separation, HjS11 is used to flush 22 off-gases to remove; SOjj (0.6 kmol / h), which is present in the exhaust gases.
    A solution of 13 (7.8 m / h), passing from the first stage of the separation of hydrogen sulfide in the apparatus 9 for causticization, contains, kmol / h: 14.8, 2.7 jNaHCOa, 1 NaHS, 0.2 NaiSO and 10 , 4 NaCl, This solution is treated with calcium hydroxide in apparatus 23 and the precipitated CaCO3 precipitate is separated, and the resulting solution 25 containing, kmol / h: 30 NaOH, 2, 1 Na, jS, 0.2 NajjSO and 10.4 NaCl , is directed to the evaporation crystallization in the apparatus 26, where water 27 is evaporated with an intensity of 5.8 tons / h, and NaCl 28 crystals are separated with an intensity of 9 kmol / h. Obtained in the apparatus 26 uterine liquor 29, containing, kmol / h 30 NaOH, 2 Na, COZ, 1, 0.2 Na, jSO ;,
    and 1.4 NaCl, is sent for absorption into apparatus 17.
    The proposed method allows for a high degree of chloride recovery and reduces the corrosiveness of the liquor.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A method for extracting chemicals from a green liquor containing chlorides, including causticization of green liquor and subsequent evaporative crystallization of chlorides, which is so that green liquor is treated with flue gases before causticization in order to increase the degree of chloride recovery to carbonize the sodium sulfide contained therein to form a solution containing sodium hydrosulfide and sodium carbonate, after which the resulting solution is subjected to It was evaporated by crystallization with sodium carbonate and sodium hydrosulfide was removed by contacting the solution with sodium bicarbonate to form a solution. Containing sodium carbonate and hydrogen sulfide, the resulting sulfur-hydrogen is absorbed in an alkaline solution, and non-absorbed hydrogen sulfide is sent to the flue gas treatment stage.
    , /VaffS.A/agCa Jsl-O5 NaOH
    Editor About Golovach
    Compiled by A.Monosov
    Tehred, L.OliynykKorrektor M.Samborsk
    Order 1228/58 Circulation 341 Subscription
    VYIIPI USSR State Committee
    for inventions and discoveries 113035, Moscow,), Raushsk nab., d, 4/5
    Production, polygraphic enterprise, Ulagorod, Project Project, 4
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    同族专利:
    公开号 | 公开日
    SE8305751L|1984-04-21|
    FI67732B|1985-01-31|
    FI823587A0|1982-10-20|
    SE462718B|1990-08-20|
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    ZA837742B|1984-06-27|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1692877C3|1965-11-24|1975-10-02|Oy Tampella Ab, Tampere |Method and device for working up aqueous sulphide solutions, in particular green liquors containing sodium sulphide resulting from the production of alkaline sulphate cellulose|
    DE1692878C3|1966-05-25|1974-04-04|Oy Tampella Ab, Heinola |Process / to crystallize out alkali as carbonate from the melting solution resulting from the processing of the pulp waste liquor|
    US3841962A|1972-07-31|1974-10-15|Mac Millan Bloedel Ltd|Hydrogen sulfide pretreatment of lignocellulosic materials in alkaline pulping processes|
    JPS503801A|1973-05-21|1975-01-16|
    FI49737C|1973-11-28|1975-09-10|Tampella Oy Ab|Method for separating sulfur hydrogen sulphide from clarified green liquor obtained from the incineration of waste liquor.|
    FI53728C|1974-03-12|1978-07-10|Ahlstroem Oy|FOERFARANDE FOER AOTERVINNING AV KEMIKALIER UR AVLUTAR FRAON SULFATCELLULOSAKOK OCH AVFALLSVATTEN FRAON BLEKNING|
    ZA762995B|1976-05-19|1977-07-27|Sappi Ltd|Improvements relating to recovery of chemicals|
    JPS5310374A|1976-07-15|1978-01-30|Ebara Corp|Removing method for hydrogen sulfide and sulfur dioxide contained in exhaust gas|
    US4184121A|1976-08-30|1980-01-15|Zenith Radio Corporation|Wide window tuning system|
    SE434860B|1976-11-15|1984-08-20|Mo Och Domsjoe Ab|PROCEDURE FOR EXPOSURE OF CHLORIDES FROM CHEMICALS RECOVERY SYSTEMS BY SODIUM-BASED PREPARATION PROCESSES|
    FI54946C|1977-09-05|1979-04-10|Tampella Oy Ab|SAETTING OVER ANORDINATION FOR SODIUM CHEMICALS FRAON GROENLUT SAMT ROEKGASER|
    US4288286A|1978-12-08|1981-09-08|Hooker Chemicals & Plastics Corp.|Kraft mill recycle process|FI77064C|1985-04-29|1989-01-10|Tampella Oy Ab|Process for boiling and bleaching cellulose|
    US5635024A|1993-08-20|1997-06-03|Bountiful Applied Research Corporation|Process for separating lignins and dissolved organic compounds from kraft spent liquor|
    SE9400383L|1994-02-07|1995-08-08|Kvaerner Pulping Tech|Ways to purify a sulphide-containing alkaline liquor from chloride|
    WO2009021216A2|2007-08-08|2009-02-12|Bountiful Applied Research Corp.|Lignin dewatering process|
    AT514010B1|2013-02-26|2015-02-15|Mondi Ag|Process for causticizing green liquor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI823587A|FI67732C|1982-10-20|1982-10-20|SAETT ATT AOTERVINNA KEMIKALIER FRAON KLORIDHALTIG GROENLUT|
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