GB742598A - Recovery of cooking liquor from spent semi-chemical pulping liquors - Google Patents

Recovery of cooking liquor from spent semi-chemical pulping liquors

Info

Publication number
GB742598A
GB742598A GB3312/53A GB331253A GB742598A GB 742598 A GB742598 A GB 742598A GB 3312/53 A GB3312/53 A GB 3312/53A GB 331253 A GB331253 A GB 331253A GB 742598 A GB742598 A GB 742598A
Authority
GB
United Kingdom
Prior art keywords
liquor
sulphite
calcium
sodium
alkaline
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB3312/53A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STWB Inc
Original Assignee
Sterling Drug Inc
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 Sterling Drug Inc filed Critical Sterling Drug Inc
Publication of GB742598A publication Critical patent/GB742598A/en
Expired legal-status Critical Current

Links

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
    • D21C11/0085—Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/928—Paper mill waste, e.g. white water, black liquor treated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S423/00—Chemistry of inorganic compounds
    • Y10S423/03—Papermaking liquor

Landscapes

  • Paper (AREA)

Abstract

Sodium sulphite is recovered from spent semi-chemical pulp liquor by oxidizing said liquor under the vapour pressure of the reaction mixture and in the liquid phase in a reaction zone, reacting calcium bisulphite (added as such or formed in situ by introducing sulphur dioxide and an alkaline-reacting calcium compound such as the carbonate, oxide or hydroxide or the sulphite which is a by-product of the process) with the sodium-containing liquor formed in said reaction zone, separating the precipitated calcium sulphate, treating the filtrate with an alkaline-reacting calcium compound to form sodium sulphite and calcium sulphite and recovering the former. In a modification the sodium sulphate is separated after the formation of sodium sulphite. The oxidation is preferably performed by pumping the liquor into a tower reactor at 200-2000 lb./sq. in. and heated initially to 100-330 DEG C., preferably 235-250 DEG C. and passing a gas containing free oxygen, e.g. air, thereinto at a rate sufficient to ensure complete oxidation of the liquor. The oxidized liquor is then passed through a flash chamber where gases are vented and some concentration takes place. When calcium bisulphite is produced in situ, the mixture should be maintained at above room temperature, preferably at 12-25 DEG C, or more, and suitable pHs are less than 5, preferably 3-4.5. In the second stage wherein an alkaline calcium compound is added, a suitable temperature is 70 DEG C. and a pH of 7-12 is generally obtained.
GB3312/53A 1952-02-21 1953-02-05 Recovery of cooking liquor from spent semi-chemical pulping liquors Expired GB742598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US272719A US2750290A (en) 1952-02-21 1952-02-21 Recovery of cooking liquor from spent semi-chemical pulping liquors

Publications (1)

Publication Number Publication Date
GB742598A true GB742598A (en) 1955-12-30

Family

ID=23040975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3312/53A Expired GB742598A (en) 1952-02-21 1953-02-05 Recovery of cooking liquor from spent semi-chemical pulping liquors

Country Status (5)

Country Link
US (1) US2750290A (en)
BE (1) BE517582A (en)
DE (1) DE1003031B (en)
GB (1) GB742598A (en)
NL (1) NL96180C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802791A (en) * 1953-09-28 1957-08-13 Paper Chemistry Inst Treatment of spent sulfite liquor
US3298781A (en) * 1962-02-09 1967-01-17 Mitsubishi Shipbuilding & Eng Production of sulfites from red mud
US3873415A (en) * 1973-05-03 1975-03-25 Spring Chemicals Ltd Process for reducing the amount of calcium contained in sodium-base waste sulfite liquor by the use of a sodium and/or an ammonium compound and additional calcium
US3962080A (en) * 1973-10-31 1976-06-08 Industrial Resources, Inc. Sodium sulfur oxides wastes disposal process

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598311A (en) * 1952-05-27 Manufacture of vanillin
NL36519C (en) * 1926-04-21 1900-01-01
FR642270A (en) * 1927-01-21 1928-08-25 Barbou Et Cie Soc Process for the recovery, by chemical means, of the active elements of the residual liquors after cooking of the cellulosic materials
US1815328A (en) * 1927-11-23 1931-07-21 Brown Co Process of recovering and utilizing the valuable compounds in spent cooking liquors
US1983789A (en) * 1928-01-23 1934-12-11 Bradley Mckeefe Corp Production of pulp and treatment of residual liquors, etc.
US2029616A (en) * 1931-01-16 1936-02-04 Patentaktiebolaget Grondal Ram Process for preparing alkali sulphite or alkali bisulphite solutions from waste liquors obtained in the digestion of cellulose with alkali sulphur compounds
US2010077A (en) * 1932-04-29 1935-08-06 Patentaktiebolaget Grondal Ram Production of solutions of alkali metal salts of sulphurous acid
US2354553A (en) * 1940-01-10 1944-07-25 Daniel L Sherk Method of recovering constituents of waste sulphite liquor
US2470764A (en) * 1943-09-23 1949-05-24 Dunbar Thomas Leonidas Method of treating waste sulfite liquor
US2516827A (en) * 1945-07-09 1950-07-25 Ontario Paper Co Ltd Method of producing vanillin
US2482594A (en) * 1946-04-01 1949-09-20 Paper Chemistry Inst Method of preparing phenolic materials from lignin
US2528350A (en) * 1947-06-05 1950-10-31 Hardwood By Products Inc Two-step digestion of hardwoods
FI27541A (en) * 1948-06-16 1955-03-10 Aschaffenburger Zellstoffwerke Förfaringssätt för framställning av vanillin och vanillinderivat
US2692291A (en) * 1950-06-06 1954-10-19 Monsanto Chemicals Manufacture of vanillin from lignin

Also Published As

Publication number Publication date
BE517582A (en)
NL96180C (en)
US2750290A (en) 1956-06-12
DE1003031B (en) 1957-02-21

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