• 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 multi-stage pulping process is performed in a single digester (10) in a batch type operation. The wood chips to be cooked are introduced into the digester (10) and soaked with a warm black liquor to remove most of the air from the digester (10) and the chips. This warm black liquor is thereafter displaced from the digester (10) with a mixture of a first stage hot black liquor and hot white liquor, the proportionate amount of hot white liquor being relatively high. The temperature of the digester contents is then raised to a cooking temperature for a predetermined amount of time. The original cooking liquor is then displaced with a mixture of a second hot black liquor and hot white liquor, the proportionate amount of hot white liquor in this second cooking liquor being less than in the first. Again, the temperature of the digester (10) is raised to a cooking temperature and the cooking is carried out for a shorter period of time than in the first cooking stage. After the required number of cooks which may be preferably three but may be as low as two or more than three, the cooking liquor is displaced from the digester with a liquid filtrate (47) derived from pulp washing. Finally, the contents of the digester (10) are emptied by applying gas under pressure to the interior of the digester (10).
    公开号:SU1454262A3
    申请号:SU843781689
    申请日:1984-08-23
    公开日:1989-01-23
    发明作者:Смит Грант Ральф
    申请人:Белойт Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    SP
    four;
    N9
    ten
    15
    The invention relates to the pulp and paper industry and can be used for pulping various cooking solutions.
    The purpose of the invention is to reduce the process time and steam consumption.
    The proposed batch process for pulping involves feeding wood chips to a digester, impregnating it with black liquor at a temperature below the boiling temperature, displacing the impregnating black liquor from the boiler with a preheated mixture of black and white liquor, raising the temperature of the reaction mixture, boiling the chips with the final mixture at the final temperature , replacement of the spent liquor at the end of cooking with the filtrate from the washing stage and unloading the contents of the cooking boiler by supplying gas under pressure to its internal Part. Cooking is carried out in three stages, the first of which is carried out for 35 minutes when the content of white liquor in the mixture is 69% of its total consumption for cooking, the second for 15 minutes when the content of white liquor in the mixture is 22%, and the third during 10 min when the content of white liquor is 9% of its total consumption for cooking.
    The total amount of white liquor used for multi-stage cooking is 25% of the capacity of the digester without the volume of chips in the digester.
    The proposed method is carried out as follows.
    Chips are loaded into the digester 0 with a removable lid, then warm black liquor is pumped from the black liquor base to the ntenbi soak into the base of the digester of the digester 13, and the contents of the boiler can be heated to the boiling point by pumping the steam condensate.
    14542622
    The system for implementing the method includes a tank for storing fresh hot white liquor heated by heat exchange by draining part of the hot liquor, and accumulators of hot liquors for the first, second and third cooking stages, respectively, obtained by supplying black and white liquors through flow regulators into the drive and representing the necessary mixture of black and white liquors.
    After the impregnation is completed, the liquor is successively replaced with hot liquor of the first cooking stage, after the first cooking stage has expired with the second stage liquor, and after the second stage has passed with the third stage cooking liquor.
    The fibrous semi-finished product obtained as a result of a three-stage cooking process is washed, the filtrate is heated by heat exchange with hot liquor and fed to the storage tank of hot filtrate, then to the digester.
    20
    25
    35
    To unload the contents of the digester, an exhaust valve is provided, which opens after the end of cooking and injection into the boiler through the air inlet duct or other fluid.
    The proposed sequential use of different cooking solutions in the process of one multi-stage cooking is possible in the implementation of sulphate or soda cooking and provides a more complete delignification of the fibrous semi-finished product.
    Example. A peridic method for producing sulphate pulp from soft wood chips is carried out in the manner described in a 6000 cubic meter digester. feet with process parameters listed in Table. one.
    Table 1
    0
    five
    To discharge the contents of the digester, an exhaust valve is provided, which opens after the end of cooking and injection into the boiler through the air inlet duct or other fluid.
    The proposed sequential use of different cooking solutions in the process of one multi-stage cooking is possible in the implementation of sulphate or soda cooking and provides a more complete delignification of the fibrous semi-finished product.
    Example. A peridic method for producing sulphate pulp from soft wood chips is carried out in the manner described in a 6000 cubic meter digester. feet with process parameters listed in Table. one.
    Table 1
    3U54262
    At the same time, the data on the long-term, thus the invention of various operations of the three-stage process, to effectively carry out the sulphate method for the production of sulphate and cellulose pulping in relatively small amounts are given in Table. 2, a cooking cycle of short duration, i.e. improve productivity Table2process.
    Operations
    Continue the firmament, min
    Chip loading
    Warm liquor impregnation
    Fill with first liquor
    First stage cooking
    Filling with second liquor
    Second cooking stage
    Filling with the third hot liquor
    Third stage cooking
    Replacement of high and low liquor
    Purge Reserve
    权利要求:
    Claims (1)
    [1]
    Formula invented t i n
    five
    0
    five
    Periodic method of pulp production, including feeding wood chips into the digester, impregnating it with black liquor at a temperature below the boiling temperature, displacing the black liquor impregnating liquor from the boiler with a preheated mixture of black and white liquors, raising the temperature of the reaction mixture, boiling the chips with this mixture at the end temperature, replacement of the spent liquor at the end of cooking with the filtrate. stages of unloading and unloading the contents of the digester by supplying gas under pressure to its inner part, characterized in that, in order to shorten the process time and steam consumption, the cooking is carried out in three stages, the first of which is carried out for white liquor in a mixture of 69% of its total consumption for cooking, the second lead for 15 min when the content of white liquor in a mixture of 22% of
    5 of its total cooking cost, and a third is carried out for 10 minutes with a white liquor content of 9% of its total cooking cost.
    类似技术:
    公开号 | 公开日 | 专利标题
    US4849052A|1989-07-18|Batch digester multi-stage pulping process
    SU1454262A3|1989-01-23|Periodic method of producing cellulose
    US4595455A|1986-06-17|Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification
    FI92224B|1994-06-30|Batch process for making kraft pulp
    US2229886A|1941-01-28|Method of digesting fibrous materials
    US4764251A|1988-08-16|Method for the impregnation and cooking of lignocellulosic material by a batch cooking using spent impregnation liquor from a previous batch
    US2614923A|1952-10-21|Digester filling in sulfate pulping
    RU97108781A|1999-05-10|PERIODIC PROCESS FOR PRODUCING CRAFT CELLULOSE
    US2733992A|1956-02-07|reyerson
    RU2127342C1|1999-03-10|Periodic method for cellulose cooking and cellulose production process
    EP0554391B1|1997-04-16|Pulping process
    US1771598A|1930-07-29|Process for digesting fibrous material
    RU2179606C2|2002-02-20|Method for continuous displacement of liquids
    SU1498857A1|1989-08-07|Method of alkaline digestion of pulp in intermittent-action digesters
    US2849315A|1958-08-26|Digestion of wood
    RU96121355A|1999-01-10|INFLUENCE OF TEMPERATURE AND ALKALI EXPENDITURE ON WHITE CELLULOSE
    RU2198973C2|2003-02-20|Cellulose production method
    US6139689A|2000-10-31|Apparatus for digesting pulp in a displacement batch digester that uses displacement liquor having a sufficient hydrostatic head
    RU1838487C|1993-08-30|Method of sulfate cellulose preparing
    US2882148A|1959-04-14|Method of charging cellulose digesters
    US2230119A|1941-01-28|Process of producing wood cellulose
    EP0100293A1|1984-02-08|Improvement in batch processes for digesting wood chips
    US5015333A|1991-05-14|Multi-stage pulp washing within a batch digester
    US3016088A|1962-01-09|Rapid cycle digester
    RU2138590C1|1999-09-27|Method of producing cellulose for chemical processing
    同族专利:
    公开号 | 公开日
    ES8506367A1|1985-07-16|
    FI843183A|1985-02-25|
    PH23991A|1990-02-09|
    CA1255948A|1989-06-20|
    EP0135461A1|1985-03-27|
    MX167934B|1993-04-22|
    EP0135461B1|1987-04-29|
    ES535377A0|1985-07-16|
    BR8404040A|1985-07-16|
    DE135461T1|1986-02-13|
    KR850001816A|1985-04-01|
    KR860001615B1|1986-10-14|
    DE3463401D1|1987-06-04|
    FI80085C|1990-04-10|
    FI80085B|1989-12-29|
    JPS6059189A|1985-04-05|
    IN160869B|1987-08-08|
    FI843183A0|1984-08-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2532568C2|2009-03-05|2014-11-10|Андритц Инк.|Heat recuperation from spent cooking liquor in cooking boiler at pulp and paper mill|GB291065A|1927-05-28|1928-10-11|George Cochrane Godfrey|Improvements in or relating to processes for separating or extracting cellulose or paper pulp|
    BR7406365D0|1974-08-02|1974-11-19|Suzano Papel & Celulose|EQUIPMENT AND METHOD TO DELIGNIFY FIBROUS MATERIALS WITH ALKALINE SOLUTIONS|
    FI63268C|1979-04-11|1989-06-21|Sunds Defibrator|Procedures for emptying a batch cellulose cooker.|
    FI831781L|1982-07-28|1984-01-29|Beloit Corp|PROCESS FOER PORTIONSVIS KOKNING AV TRAEFLIS|US5256255A|1989-09-28|1993-10-26|Beloit Technologies, Inc.|Displacement heating in continuous digesters|
    JPH0674557B2|1989-09-28|1994-09-21|ベロイト・テクノロジーズ・インコーポレイテッド|Heating method and device for continuous digester|
    TW270159B|1994-03-04|1996-02-11|Beloit Technologies Inc|
    US5522958A|1994-07-18|1996-06-04|Pulp And Paper Research Institute Of Canada|Two-stage kraft cooking|
    BE1011504A3|1997-10-17|1999-10-05|Solvay Interox|Manufacturing pulp chemicals.|
    US7932454B2|2007-04-18|2011-04-26|Master Key, Llc|System and method for musical instruction|
    CN102154874B|2011-04-29|2012-11-21|白福安|Replacement cooking pulping method|
    RU2499857C1|2012-04-19|2013-11-27|Открытое акционерное общество "Группа "Илим"|Method of production of sulfate pulp for chemical processing|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US52612183A| true| 1983-08-24|1983-08-24|
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