KR930008238A - How to obtain pulp of improved delignification selectivity - Google Patents

How to obtain pulp of improved delignification selectivity Download PDF

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KR930008238A
KR930008238A KR1019920019881A KR920019881A KR930008238A KR 930008238 A KR930008238 A KR 930008238A KR 1019920019881 A KR1019920019881 A KR 1019920019881A KR 920019881 A KR920019881 A KR 920019881A KR 930008238 A KR930008238 A KR 930008238A
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pulp
alkaline material
press
wash
amount
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KR1019920019881A
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Korean (ko)
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KR960006125B1 (en
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에이치. 프렌드 윌리암
티. 터레트 스튜어트
더블유. 이처스 스펜서
에프. 그리그스 브루스
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원본미기재
유니온 캠프 페이텐트 홀딩, 인코오포레이티드
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Television Systems (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Gas Separation By Absorption (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)

Abstract

Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.

Description

향상된 탈리그닌화 선택성의 펄프를 얻는 방법How to obtain pulp of improved delignification selectivity

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 종래 기술과 비교하여 본 발명에 따라 알칼리성 물질로서 처리되고 산소로서 탈리그닌화된 연질나무 펄프에 대한 K No. 및 펄프 점도사이의 상관관계를 나타내는 그래프.Figure 1 shows the K No. for softwood pulp treated as alkaline material and delignified as oxygen in accordance with the present invention as compared to the prior art. And a graph showing the correlation between pulp viscosity.

제2도는 본 발명의 방법의 개략도.2 is a schematic representation of the method of the present invention.

Claims (22)

알칼리성 물질의 용액으로 워스프레스(wash press)내의 펄프를 최소한 약 18중량%의 고점조도까지 세척하여 첫 번째량의 알칼리성 물질을 펄프에 부가하여 첫 번째량의 알칼리성 물질을 세척된 펄프의 도처에 실제적으로 균일하게 분포시키고; 워시 프레스로부터 프레스배출물(pressate)을 제거하고; 펄프의 오븐 건조 중량을 기준으로 약 0.8내지 7중량%의 전체량의 알칼리성 물질을 고점조도 펄프상에 제공하며, 이때 상기의 전체량은 상기의 첫 번째량을 포함하며; 그리고 알칼리성 물질 함유 고점조도 펄프를 산소 탈리그닌화 하여 향상된 탈리그닌화 선택성 및 산소 탈리그닌화된 펄프를 얻는 것을 포함함을 특징으로 하는, 고전조도 산소 탈리그닌화동안 향상된 탈리그닌화 선택성의 펄프를 얻는 방법.The pulp in the wash press is washed with a solution of alkaline material to a high consistency of at least about 18% by weight, adding the first amount of alkaline material to the pulp so that the first amount of alkaline material is applied throughout the washed pulp. Uniformly distributed with; Removing pressate from the wash press; Providing from about 0.8 to 7% by weight of a total amount of alkaline material on the high viscosity pulp based on the oven dry weight of the pulp, wherein the total amount comprises the first amount above; And oxygen delignifying the high viscosity pulp containing alkaline material to obtain improved delignification selectivity and oxygen delignified pulp, wherein the pulp of improved delignification selectivity during high-risk oxygen delignification is obtained. How to get. 제1항에 있어서, 펄프가 브라운스톡(brownstock)이고, 브라운스톡에 부가된 첫 번째량이 전체량과 같아지도록 충분한량의 알칼리성 물질 용액으로서 워시 프레스내의 브라운스톡을 세척하는 것을 추가로 포함하는 방법.The method of claim 1, further comprising washing the brownstock in the wash press with a sufficient amount of alkaline material solution such that the pulp is brownstock and the first amount added to the brownstock is equal to the total amount. 제1항에 있어서, 펄프를 희석수와 혼합하여 약 5중량%이하의 점조도를 갖는 저점조도 펄프를 얻고 펄프를 워시 프레스로 향하게하여 펄프에 알칼리성 물질을 부가하는 것을 추가로 포함하는 방법.The method of claim 1, further comprising mixing the pulp with dilution water to obtain a low viscosity pulp having a consistency of up to about 5% by weight and directing the pulp to a wash press to add an alkaline substance to the pulp. 제3항에 있어서, 혼합된 펄프의 저점조도 약 1내지 4.5중량%이고, 워시 프레스로 부터의 프레스배출물의 최소한 일부분을 재순환시켜서 혼합단계시에 희석수로서 사용하는 것을 추가로 포함하는 방법.4. The process of claim 3 wherein the low viscosity of the mixed pulp is between about 1 and 4.5 weight percent, further comprising recycling at least a portion of the press discharge from the wash press to use as dilution water in the mixing step. 제4항에 있어서, 실제적으로 모든 희석수가 프레스배출물로 구성되는 방법.The method of claim 4 wherein substantially all of the dilution water consists of the press discharge. 제1항에 있어서, 워시 프레스로부터 제거된는 프레스배출물을 보유시키고 프레스 배출물의 일부분을 펄프/희석수 혼합 단계에 연속적으로 귀환시키는 것을 추가로 포함하는 방법.The method of claim 1, further comprising retaining the press discharge removed from the wash press and continuously returning a portion of the press discharge to the pulp / dilution water mixing step. 제1항에 있어서, 고점조도 펄프상에 두 번째량의 알칼리성 물질을 부가하는 것을 추가로 포함하며, 이때 첫 번째량과 두 번째량의 결합량이 고점조도 펄프상에 제공된 알칼리성 물질의 전체량과 같아지는 방법.The method of claim 1, further comprising adding a second amount of alkaline material onto the high viscosity pulp, wherein the amount of binding of the first and second amounts is equal to the total amount of alkaline material provided on the high viscosity pulp. How to lose. 제1항에 있어서, 펄프의 점조도가 산소 탈리그닌화전에 약25내지 35중량%까지 증가되는 방법.The method of claim 1 wherein the consistency of the pulp is increased by about 25 to 35 weight percent before oxygen delignification. 제1항에 있어서, 펄프의 셀룰로오스 성분들을 별로 손산시킴이 없이 고점조도 펄프의 K No.를 50%이상만큼 감소시킴으로써 산소 탈리그닌화 단계가, 향상된 탈리그닌화 선택성을 얻는 방법.The method of claim 1, wherein the oxygen delignification step achieves improved delignification selectivity by reducing the K No. of the high viscosity pulp by at least 50% without significantly reducing the cellulose components of the pulp. 제9항에 있어서, K No.가 탈리그닌화전의 약 10내지 26에서 탈리그닌화후의 약5내지 10까지 감소되는 방법.The method of claim 9, wherein the K No. is reduced from about 10 to 26 before delignification to about 5 to 10 after delignification. 제7항에 있어서, 펄프가 비표백된 연질나무 펄프이고 펄프에 부가된 알칼리성 물질의 전체량이 약 1.5내지 4중량%이며, 첫 번째 및 두 번째량이 각각 약0.75내지 2중량%인 방법.8. The method of claim 7, wherein the pulp is unbleached softwood pulp and the total amount of alkaline material added to the pulp is about 1.5 to 4 weight percent, and the first and second amounts are about 0.75 to 2 weight percent, respectively. 제7항에 있어서, 펄프가 비표백된 경질 나무 펄프이고 펄프에 부가된 알칼리성 물질의 전제량이 액 1내지 3.8중량%이며, 첫 번째 및 두 번째량이 각각 약 0.5내지 1.9중량%인 방법.8. The method of claim 7, wherein the pulp is unbleached hard wood pulp and the total amount of alkaline material added to the pulp is between 1 and 3.8% by weight of liquid and the first and second amounts are between about 0.5 and 1.9% by weight, respectively. 제1항에 있어서, 프레스배출물이 알칼리성 물질을 함유하고, 워시 프레스내에서 알칼리성 물질을 부가하기 전에 프레스배출물의 최소한 일부분으로 펄프를 세척하는 것을 추가로 포함하는 방법.The method of claim 1, wherein the press discharge contains alkaline material and further comprises washing the pulp with at least a portion of the press discharge before adding the alkaline material in the wash press. 제1항에 있어서, 약0.4이하의 희석 인자 및 최소한 약0.5의 변위비율에서 워시 프레스를 조작하는 것을 추가로 포함하는 방법.The method of claim 1, further comprising operating the wash press at a dilution factor of about 0.4 or less and a displacement ratio of at least about 0.5. 제14항에 있어서, 희석 인자가 약 0.25이하이고 변위 비율이 최소한 약 0.75인 방법.The method of claim 14, wherein the dilution factor is no greater than about 0.25 and the rate of displacement is at least about 0.75. 비표백된 펄프를 희석수와 혼합하여 약 1내지 4.5중량%의 점조도를 갖는 저점조도 펄프를 얻고 그 펄프를 워시 프레스로 향하게 하고; 최소한 약 18중량%의 고점조도까지 알칼리성 물질의 용액으로 워시 프레스에서 펄프를 세척하여 펄프에 첫 번째의 알칼리성 물질을 부가하면서 0근처의 희석 인자 및 가능하면 1에 가까운 변위비율에서 워시 프레스를 조작하여 첫 번째량의 알칼리성 물질을 세척된 펄프의 도처에 실제적으로 균일하게 분포시키고; 워시 프레스로부터 프레스배출물을 제거하고; 펄프에 부가된 첫 번째량이 전체량과 같아지도록 충분한 양의 알칼리성 물질 용액으로 워시 프레스에서 비표백 펄프를 세척하여 펄프의 오븐 건조 중량을 기준으로 최소한 약 0.8내지 7중량%의 전체량의 알칼리성 물질을 고점조도 펄프상에 제공하고; 그리고 알칼리성 물질을 함유하는 고점조도 펄프를 산소 탈리그닌화하여 향상된 탈리그닌화 선택성 및 산소 탈리그닌화된 펄프를 얻는 것을 포함하는, 고점조도 산소 탈리그닌화 동안 향상된 탈리그닌화 선택성의 비표백 펄프를 얻기위한 방법.Mixing the unbleached pulp with dilution water to obtain a low viscosity pulp having a consistency of about 1 to 4.5 weight percent and directing the pulp to a wash press; Wash the pulp in a wash press with a solution of alkaline material up to a high consistency of at least about 18% by weight and add the first alkaline material to the pulp while operating the wash press at a dilution factor near 0 and possibly a displacement ratio as close as 1 The first amount of alkaline material is distributed substantially uniformly throughout the washed pulp; Removing press discharge from the wash press; Wash the unbleached pulp in a wash press with a sufficient amount of alkaline material solution so that the first amount added to the pulp is equal to the total amount, so that at least about 0.8 to 7% by weight of the total amount of alkaline material is based on the oven dry weight of the pulp. Providing on high viscosity pulp; And unbleached pulp of improved delignification selectivity during high viscosity oxygen delignification, comprising oxygen delignifying the high viscosity pulp containing alkaline material to obtain improved delignification selectivity and oxygen delignification pulp. Way for getting. 제16항에 있어서, 워시 프레스로부터 제거되는 프레스배출물을 보유시키고 프레스배출물의 일부분을 펄프/희석수 혼합 단계에서 직접 연속적으로 귀환시키는 것을 추가로 포함하는 방법.17. The method of claim 16, further comprising retaining the press discharge removed from the wash press and directly returning a portion of the press discharge directly in the pulp / dilution mixing step. 비표백된 펄프를 희석수와 혼합하여 약 1내지 4.5중량% 점조도를 갖는 저점조도 펄프를 얻고 그펄프를 워시 프레스로 향하게하고; 최소한 약 18중량%의 고점조도까지 알칼리성 물질의 용액으로 워시 프레스내에서 펄프를 세척하여 펄프에 첫 번째량의 알칼리성 물질을 부가하면서 0근처의 희석 인자 및 가능하면 1에 가까운 변위 비율에서 워시 프레스를 조작하여 첫 번째량의 알칼리성 물질을 세척된 펄프의 도처에 실제적으로 균일하게 분포시키고; 워시 프레스로부터 프레스 배출물을 제거하고; 혼합단계를 위한 세척수로서 사용하기위해 프레스배출물을 최소한 일부분을 재순환하고; 고점조도 펄프가 워시 프레스로부터 배출된후 고점조도 펄프상에 두 번째량의 알칼리성 물질을 부가하며, 이때 첫 번째량과 두 번째량의 결합량은 고점조도 펄프의 오븐 건조 중량을 기준으로 최소한 약0.8내지 7중량%의 전체량과 같아지고; 그리고 알칼리성 물질을 함유하는 고점조도 펄프를 산소 탈리그닌화하여 향상된 탈리그닌화 선택성 및 산소 탈리그닌화된 펄프를 얻는 것을 포함하는, 고점조도 산소 탈리그닌화동안 표백된 펄프의 향상된 탈리그닌화 선택성을 얻기위한 방법.Mixing the unbleached pulp with dilution water to obtain a low viscosity pulp having a consistency of about 1 to 4.5 wt% and directing the pulp to a wash press; Wash the pulp in a wash press with a solution of alkaline material to a high consistency of at least about 18% by weight, adding the first amount of alkaline material to the pulp, and wash the press at a dilution factor near 0 and possibly a displacement ratio as close as 1 Operate to distribute the first amount of alkaline material substantially uniformly throughout the washed pulp; Removing press discharge from the wash press; Recycle at least a portion of the press discharge for use as wash water for the mixing step; After the high-viscosity pulp is discharged from the wash press, a second amount of alkaline material is added to the high-viscosity pulp, with the combined amount of the first and second quantities being at least about 0.8 based on the oven dry weight of the high viscosity pulp. Equal to a total amount of from 7% by weight; And improved delignification selectivity of bleached pulp during high viscosity oxygen delignification, including oxygen delignification of the high viscosity pulp containing alkaline material to obtain improved delignification selectivity and oxygen delignification pulp. Way for getting. 제18항에 있어서, 펄프가 연질 나무 펄프이고 펄프에 부가된 알칼리성 물질의 전체량이 약 1.5내지 4중량%이며, 첫 번째 및 두 번째량 각각이 약0.75내지 약2중량%의 범위인 방법.19. The method of claim 18, wherein the pulp is soft wood pulp and the total amount of alkaline material added to the pulp is in the range of about 1.5 to 4 weight percent and the first and second amounts are in the range of about 0.75 to about 2 weight percent. 제18항에 있어서, 펄프가 경질 나무펄프이고, 펄프가 부가된 알칼리성 물질의 전체량이 약 1내지 3.8중량%의 범위이며, 첫 번째 및 두 번째량 각각이 약 0.5내지 1.9중량%인 방법.19. The method of claim 18, wherein the pulp is hard wood pulp, the total amount of alkaline material added to the pulp is in the range of about 1 to 3.8 weight percent, and the first and second amounts are each about 0.5 to 1.9 weight percent. 워시 프레스내의 펄프에 부가된 알칼리성 물질의 첫 번째량이 최소한 50내지 90%인 방법.Wherein the first amount of alkaline material added to the pulp in the wash press is at least 50-90%. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920019881A 1991-10-29 1992-10-28 Process for obtaining enhanced delignification selectivity of a pulp KR960006125B1 (en)

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