ES2036486A1 - White liquor recovery from black liquor from pulping cellulose - by oxidising unreacted sodium sulphide with gas contg. oxygen before combustion - Google Patents

White liquor recovery from black liquor from pulping cellulose - by oxidising unreacted sodium sulphide with gas contg. oxygen before combustion

Info

Publication number
ES2036486A1
ES2036486A1 ES919102581A ES9102581A ES2036486A1 ES 2036486 A1 ES2036486 A1 ES 2036486A1 ES 919102581 A ES919102581 A ES 919102581A ES 9102581 A ES9102581 A ES 9102581A ES 2036486 A1 ES2036486 A1 ES 2036486A1
Authority
ES
Spain
Prior art keywords
na2s
black liquor
combustion
before combustion
pulping
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.)
Granted
Application number
ES919102581A
Other languages
Spanish (es)
Other versions
ES2036486B1 (en
Inventor
Hans-Georg Guttenberger
Wolfgang Danzer
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Publication of ES2036486A1 publication Critical patent/ES2036486A1/en
Application granted granted Critical
Publication of ES2036486B1 publication Critical patent/ES2036486B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
    • 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

Landscapes

  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

In pulping cellulose with white liquor based on Na2S and NaOH, giving black liquor contg. lignin and unreacted Na2S, from which white liquor is recovered by combustion, the novelty is that a gas contg. at least 50 vol.% O2 is passed into the black liquor before combustion. The gas is technically pure O2 or air enriched in O2. It is introduced, pref. under pressure, in an amt. large enough to oxidise the Na2S to Na2S2O3 completely before combustion. ADVANTAGE - Pretreatment with O2 prevents environmental pollution by H2S and SO2 in the waste gas from combustion. In an example, in pulping eucalyptus cellulose, the amt. of black liquor (TS = 16-18%) was 192 cu.m/h, temp. 80 deg.C and Na2S concn. 8 g/l. 74 Ncu.m O2/h were introduced at 7.5 bar gauge, when the temp. rose by ca. 1 deg.C and ca. 1.0 g/l Na2S was reduced. If the total of 1.97 x 10 power4 mole Na2S was oxidised by the wet chemical method, the amt. of Na2SO4 added could be reduced by 50 t/day
ES9102581A 1990-12-01 1991-11-20 PROCEDURE FOR CELLULOSE DISGREGATION. Expired - Lifetime ES2036486B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904038420 DE4038420A1 (en) 1990-12-01 1990-12-01 White liquor recovery from black liquor from pulping cellulose - by oxidising unreacted sodium sulphide with gas contg. oxygen before combustion

Publications (2)

Publication Number Publication Date
ES2036486A1 true ES2036486A1 (en) 1993-05-16
ES2036486B1 ES2036486B1 (en) 1994-04-01

Family

ID=6419418

Family Applications (1)

Application Number Title Priority Date Filing Date
ES9102581A Expired - Lifetime ES2036486B1 (en) 1990-12-01 1991-11-20 PROCEDURE FOR CELLULOSE DISGREGATION.

Country Status (4)

Country Link
DE (1) DE4038420A1 (en)
ES (1) ES2036486B1 (en)
FR (1) FR2669947B1 (en)
PT (1) PT99649B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709975A (en) * 1970-05-28 1973-01-09 Owens Illinois Inc Method for the oxidation of black liquor
US4058433A (en) * 1975-03-06 1977-11-15 Gulf States Paper Corporation Conversion of sulfur in blank liquor to eliminate odorous emissions and facilitate the collection of sulfate soaps
EP0040093A1 (en) * 1980-05-12 1981-11-18 Air Products And Chemicals, Inc. System and process for reducing oxygen consumption in black liquor oxidation
ES2012585A6 (en) * 1988-01-13 1990-04-01 Air Prod & Chem Combustion of black liquor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549314A (en) * 1968-05-20 1970-12-22 Chemical Construction Corp Oxidation of black liquor
GB1353909A (en) * 1970-08-22 1974-05-22 Chemech Eng Ltd Process for the control of malodorous emissions from kraft pulpmills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709975A (en) * 1970-05-28 1973-01-09 Owens Illinois Inc Method for the oxidation of black liquor
US4058433A (en) * 1975-03-06 1977-11-15 Gulf States Paper Corporation Conversion of sulfur in blank liquor to eliminate odorous emissions and facilitate the collection of sulfate soaps
EP0040093A1 (en) * 1980-05-12 1981-11-18 Air Products And Chemicals, Inc. System and process for reducing oxygen consumption in black liquor oxidation
ES2012585A6 (en) * 1988-01-13 1990-04-01 Air Prod & Chem Combustion of black liquor

Also Published As

Publication number Publication date
FR2669947A1 (en) 1992-06-05
FR2669947B1 (en) 1995-03-24
DE4038420A1 (en) 1992-06-04
ES2036486B1 (en) 1994-04-01
PT99649A (en) 1992-10-30
PT99649B (en) 1999-11-30

Similar Documents

Publication Publication Date Title
SE8302245D0 (en) CHEMICAL EQUIPMENT FROM MASS DEVICES
ES8704570A1 (en) Process for chemicals and energy recovery.
DE69304072T2 (en) Pulp factory without drain
GR3015893T3 (en) Process for the removal of sulfur dioxide from waste gas.
SE470538C (en) When bleaching pulp, use no chlorine-containing chemicals
ES2036486A1 (en) White liquor recovery from black liquor from pulping cellulose - by oxidising unreacted sodium sulphide with gas contg. oxygen before combustion
US3755068A (en) Regeneration of chlorine dioxide for pulp treatment
US5660685A (en) Gasifying black liquor with recycling of generated hydrogen sulphide gas to the gasifier
GB1336899A (en) Pollution controlled polysulphide recovery process
FI98538B (en) Process for the preparation of sodium hydroxide from white liquor
SE9202780D0 (en) PROCEDURES FOR THE PROCESSING OF MATERIALS CONTAINING SODIUM SULPHATE AND / OR SODIUM CARBONATE IN A MASS FACTORY
CA1076306A (en) Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulose material with alkaline sodium- and sulfur-containing sulfate pulping liquor
CA2160008A1 (en) Process for converting sodium sulphate
CA2078308C (en) Recovering pulp mill chlorine dioxide emission
Hendrickson et al. Black liquor oxidation as a method for reducing air pollution from sulfate pulping
ES8305660A1 (en) Extraction of arsenic in solution in liquors containing alkali metal carbonate, sulphate and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum
WO2000044978A1 (en) Process for oxidising white liquor
FR2345392A1 (en) Chlorine dioxide produced by redn. of alkaline chlorate - in acid medium, with recycling of residual effluent gases (SF 30.11.77)
Lunden Stora-Broby Recovery Process for Semichemical Pulp Mills
SE9400383D0 (en) Process for separating chloride from sulphide-containing alkaline liquor
FR2246300A1 (en) Nitrogen mono- and di-oxides removal from gas - by contact with acid aq. chlorate soln. and (alkaline) aq. soln. avoids sec. pollution
Croon Some Systems Developed for Pollution Abatement in the Pulp Industry, Particularly Oxygen Bleaching
JPH07258987A (en) Method for oxygen bleaching of lignocellulosic substance
NL7317364A (en) Removing sulphur dioxide from waste gases - by converting into sulphite and oxidising to sulphate
FI95822B (en) Treatment of the melt of a soda boiler or equivalent boiler