WO1980002574A1 - Pulping liquor reutilization - Google Patents

Pulping liquor reutilization Download PDF

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Publication number
WO1980002574A1
WO1980002574A1 PCT/AU1980/000012 AU8000012W WO8002574A1 WO 1980002574 A1 WO1980002574 A1 WO 1980002574A1 AU 8000012 W AU8000012 W AU 8000012W WO 8002574 A1 WO8002574 A1 WO 8002574A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquor
spent
kraft
nssc
black liquor
Prior art date
Application number
PCT/AU1980/000012
Other languages
English (en)
French (fr)
Inventor
A Farrington
P Nelson
Original Assignee
Australian Paper Manufacturers
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Australian Paper Manufacturers filed Critical Australian Paper Manufacturers
Priority to AU61253/80A priority Critical patent/AU524359B2/en
Publication of WO1980002574A1 publication Critical patent/WO1980002574A1/en

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Classifications

    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0057—Oxidation of liquors, e.g. in order to reduce the losses of sulfur compounds, followed by evaporation or combustion if the liquor in question is a black liquor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0014—Combination of various pulping processes with one or several recovery systems (cross-recovery)

Definitions

  • This invention relates to an improvement in the recovery and use of chemicals used in the manufacture of paper pulp by the kraft process and the neutral sulphite semichemical (NSSC) pulping process.
  • the Kraft process for production of paper pulp from wood and other lignocellulosic materials involves digestion of the latter with an aqueous solution of sodium hydroxide and sodium sulphide. It includes a chemical recovery stage in which the spent liquor ("black liquor") containing dissolved organic substances from the lignocellulose together with inorganic pulping chemicals is concentrated and burned in a furnace. In this way the heat equivalent of the organic substances, which represent about half the weight of the lignocellulosic raw material, is recovered in the form of steam and the inorganic chemicals recovered as a smelt.
  • the latter which consists essentially of a mixture of sodium carbonate and sodium sulphide is dissolved in water to form "green liquor” and then treated with slaked lime to re-form the pulping chemicals, viz. sodium hydroxide and sodium sulphide (white liquor).
  • pulping chemicals viz. sodium hydroxide and sodium sulphide (white liquor).
  • Pulping installations producing pulp for the manufacture of container materials often comprise, besides a kraft mill, a neutral sulphite semichemical (NSSC) mill to produce high yield pulp suitable for making corrugating medium and perhaps for inclusion as a component of the liner.
  • a neutral sulphite semichemical (NSSC) mill to produce high yield pulp suitable for making corrugating medium and perhaps for inclusion as a component of the liner.
  • Processes available for recovery of the pulping chemicals from the NSSC process are complex and expensive and it is common practice to use the spent liquor from the NSSC process as 'make-up' for the kraft mill to make good the losses in the latter.
  • Another alternative which has been considered is to re-cycle the kraft mill chemicals, at least in part, to the NSSC mill, thus reducing the amount of fresh chemicals entering the kraft-NSSC system as a whole.
  • This can be done, for instance, by extracting green liquor from the kraft recovery circuit prior to causticization and using the green liquor as chemical for the NSSC mill.
  • Green liquor is an aqueous solution of sodium carbonate and sodium sulphide, commonly in the approximate ratio of 4 to 1, and in theory it can replace part or all of the sodium carbonate used in neutral sulphite pulping.
  • a sodium carbonate solution is treated with sulphur dioxide ('sulphitation') to form sodium sulphite but the treatment is normally discontinued after ca 75-95% of the carbonate has been converted to sulphite.
  • the remaining 5 to 25% of carbonate serves as the so-called 'buffer' to neutralize wood-derived acids in the early stages of pulping.
  • Green liquor can serve either as 'buffer' by mixing it with "a sodium sulphite solution formed by complete sulphitation of a sodium carbonate solution or it can be used to replace the sodium carbonate solution before sulphitation, i.e. to provide the whole of the sodium for the NSSC mill. Whichever way the green liquor is used it creates serious environmental problems.
  • This invention provides such a method, the said method comprising recovering from the kraft process, spent black liquor; converting the kraft black liquor to green liquor; oxidizing the green liquor in the presence of an oxygen containing gas and an effect ive amount of at least one additive selected from the group consisting of a quinone or hydroquinone compound, spent kraft black liquor, spent NSSC black liquor and spent black liquor from a semi chemical soda process; and utilizing the thus oxidized green liquor in a neutral sulphite semi-chemical (NSSC) pulping process.
  • the oxidation of the green liquor according to this invention is remarkably accelerated compared to air oxidation alone .
  • the oxygen containing gas is preferably air and the reaction is carried out within preferred temperature range of 50 to 150°C.
  • the sulphide can be completely destroyed in a relatively short time at . atmospheric pressure and moderate temperature, without the need for a pressure vessel.
  • the spent delignification liquors preferred as catalytic additives to the green liquor are spent kraft pulping liquor (black liquor), spent soda liquor from the soda semi-chemical pulping process, or NSSC spent liquor with the latter being preferred.
  • the quinone compounds which may also be used are preferably anthraquinone or anthraquinone monosulfonate.
  • the spent liquors may already include quinone compounds if these have been added to the delignification liquors to accelerate the delignification process in either the kraft, soda or NSSC process.
  • the oxidation by air of the green liquor was compared to the oxidation in the presence of the catalytic additives of this invention.
  • Table 1 and Figure 1 provide comparative results in the use of NSSC spent liquor (line E), anthraquinone monosulphonate (AMS) (line D), soda black liquor which includes anthraquinone (line C), kraft black liquor (line B), compared to the absence of additive (line A).
  • AMS anthraquinone monosulphonate
  • line C soda black liquor which includes anthraquinone
  • line B kraft black liquor
  • Table 1 and Figure 1 provide comparative results in the use of NSSC spent liquor (line E), anthraquinone monosulphonate (AMS) (line D), soda black liquor which includes anthraquinone (line C), kraft black liquor (line B), compared to the absence of additive (line A).
  • the effectiveness of using oxidized kraft green liquor in NSSC pulping as a buffer or as the total chemical liquor is shown in Table 2.
  • the sulphited oxidized green liquor is sulphited to form an NSSC pulping liquor equivalent.
  • the present invention enables spent liquors from delignification processes to be usefully employed to avoid waste of the spent liquors and to provide recovery and recycling of excess kraft green liquor for oxidation and use in NSSC pulping.
  • the regeneration of kraft black liquor is a simple and convenient method and provides a product that can find use in an associated pulping process.
  • the present invention is more convenient as it does away with the need to convert green liquor to white liquor prior to oxidation and furthermore, the oxidized product of this invention can be used as an NSSC pulping liquor which is a product in greater demand than oxidized white liquors.
  • a further advance provided by this invention is that spent liquors from other pulping processes or quinone compounds are more active than kraft liquor in oxidation of Na 2 S containing solutions.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
PCT/AU1980/000012 1979-05-18 1980-05-15 Pulping liquor reutilization WO1980002574A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61253/80A AU524359B2 (en) 1979-05-18 1980-05-15 Pulping liquor reutilization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU8866/79 1979-05-18
AUPD886679 1979-05-18

Publications (1)

Publication Number Publication Date
WO1980002574A1 true WO1980002574A1 (en) 1980-11-27

Family

ID=3768116

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1980/000012 WO1980002574A1 (en) 1979-05-18 1980-05-15 Pulping liquor reutilization

Country Status (4)

Country Link
JP (1) JPS6339716B2 (enrdf_load_html_response)
NZ (1) NZ193758A (enrdf_load_html_response)
WO (1) WO1980002574A1 (enrdf_load_html_response)
ZA (1) ZA802966B (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025197A1 (en) * 1994-03-17 1995-09-21 Amcor Limited Regeneration of pulp liquors

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640758A (en) * 1949-02-23 1953-06-02 Robert S Aries Method of oxidizing sodium sulfide to sodium sulfite in successive stages
US3573157A (en) * 1967-05-08 1971-03-30 Domtar Ltd Increasing the polysulfide content of an alkaline pulp impregnation liquor
US3647363A (en) * 1969-08-06 1972-03-07 Owens Illinois Inc Recovery of sulfur values from flue gases with oxidized neutral sulfite green liquor
FR2168175A1 (enrdf_load_html_response) * 1968-10-30 1973-08-31 Ebara Infilco
AU7152874A (en) * 1973-07-25 1976-01-29 Mooch Domsjo Aktiebolag A method for producing oxidized white liquor
CA1013510A (en) * 1973-06-18 1977-07-12 Takeji Tanaka Process for recovery of pulp digesting chemicals
JPS5499343A (en) * 1978-01-21 1979-08-06 Nippon Catalytic Chem Ind Method of oxidizing alkalinne liquid containing sodium sulfide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5618710B2 (enrdf_load_html_response) * 1973-08-20 1981-05-01
JPS5188703A (ja) * 1975-01-27 1976-08-03 Kurafutoparupujokaiyakuhinkaishukoteiniokeru hakueki jakueki mataha ryokuekichunoryukanatoriumuno sankahoho
JPS5188702A (ja) * 1975-01-27 1976-08-03 Kurafutoparupujokaiyakuhinkaishukoteiniokeru hakueki jakueki mataha ryokuekichunoryukanatoriumuno sankaho

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640758A (en) * 1949-02-23 1953-06-02 Robert S Aries Method of oxidizing sodium sulfide to sodium sulfite in successive stages
US3573157A (en) * 1967-05-08 1971-03-30 Domtar Ltd Increasing the polysulfide content of an alkaline pulp impregnation liquor
FR2168175A1 (enrdf_load_html_response) * 1968-10-30 1973-08-31 Ebara Infilco
US3647363A (en) * 1969-08-06 1972-03-07 Owens Illinois Inc Recovery of sulfur values from flue gases with oxidized neutral sulfite green liquor
CA1013510A (en) * 1973-06-18 1977-07-12 Takeji Tanaka Process for recovery of pulp digesting chemicals
AU7152874A (en) * 1973-07-25 1976-01-29 Mooch Domsjo Aktiebolag A method for producing oxidized white liquor
JPS5499343A (en) * 1978-01-21 1979-08-06 Nippon Catalytic Chem Ind Method of oxidizing alkalinne liquid containing sodium sulfide

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Chemical Abstracts, Vol 92, no. 4, published 1980, (Columbus, Ohio USA), see abstract 24549M to EHARO J/HO (Japan), Vol 109, published 1979, pages 45-48, T. NAITO and K. KAWAKAMI: "The recovery process of NS pulp cooking materials" *
Chemical Abstracts, Vol 92, no. 4, published 1980, (Columbus, Ohio), see abstract 24B34K; & JP-A-54099343, published 6 Aug 1979, (TOKAI PULP CO. LTD) *
J. Appl. Chem, Biotechnol., Vol 28, issued 1978; Issue 10, published U.S.A., H. VEERAMANI and L.N. JOHANSON: "Oxidation of Sulphide in Kraft Black Liquor and Green Liquor by residual Oxygen in Flue Gas during Precarbonation", pages 668-670 *
PULP and PAPER CANADA, Vol 79, published 1978, August, issue 8, S. MIZUGUCHI and T. NAITO: "NSSC recovery process uses direct oxidation", pages T251-T253 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025197A1 (en) * 1994-03-17 1995-09-21 Amcor Limited Regeneration of pulp liquors
US5849197A (en) * 1994-03-17 1998-12-15 Amcor Limited Regeneration of pulp liquors

Also Published As

Publication number Publication date
JPS56500540A (enrdf_load_html_response) 1981-04-23
JPS6339716B2 (enrdf_load_html_response) 1988-08-08
ZA802966B (en) 1981-06-24
NZ193758A (en) 1982-05-31

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