NO133594B - - Google Patents
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- NO133594B NO133594B NO758/71A NO75871A NO133594B NO 133594 B NO133594 B NO 133594B NO 758/71 A NO758/71 A NO 758/71A NO 75871 A NO75871 A NO 75871A NO 133594 B NO133594 B NO 133594B
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- magnesium
- complex
- salts
- acids
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 13
- 229910001882 dioxygen Inorganic materials 0.000 claims description 13
- 229910052749 magnesium Inorganic materials 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 150000002681 magnesium compounds Chemical class 0.000 claims description 11
- 229920002678 cellulose Polymers 0.000 claims description 10
- 239000001913 cellulose Substances 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 150000007513 acids Chemical class 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 159000000003 magnesium salts Chemical class 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 150000001447 alkali salts Chemical class 0.000 claims description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 150000001261 hydroxy acids Chemical class 0.000 claims description 3
- 239000012456 homogeneous solution Substances 0.000 claims description 2
- -1 hydroxide Chemical class 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 238000005470 impregnation Methods 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 29
- 238000002474 experimental method Methods 0.000 description 14
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 7
- 238000007792 addition Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 150000002680 magnesium Chemical class 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229960003330 pentetic acid Drugs 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- DLVZBSZXZDGKQY-UHFFFAOYSA-N 2,2-dihydroxybutanoic acid Chemical compound CCC(O)(O)C(O)=O DLVZBSZXZDGKQY-UHFFFAOYSA-N 0.000 description 1
- URDCARMUOSMFFI-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CCN(CC(O)=O)CC(O)=O URDCARMUOSMFFI-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical class C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/08—Alkali cellulose
-
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Description
Foreliggende oppfinnelse vedrører en fremgangsmåte til avlignif-isering ved oksygengass-iehandling av celluloseholdige materialer i nærvær av alkali, ved hjelp av kompleksdanner. The present invention relates to a method for delignification by oxygen gas treatment of cellulosic materials in the presence of alkali, by means of complex formers.
Det er tidligere kjent å behandle celluloseholdig materiale, f.eks. trecellulose, med alkali under tilførsel av luft eller oksygengass i nærvær av beskyttende forbindelser slik som magnesiumsalter og kompleksdannere for magnesiumioner, slik som salter av hydroksykarbonsyrer og/eller ferdigdannede komplekse magnesiumsalter. It is previously known to treat cellulose-containing material, e.g. wood cellulose, with alkali under the supply of air or oxygen gas in the presence of protective compounds such as magnesium salts and complex formers for magnesium ions, such as salts of hydroxycarboxylic acids and/or preformed complex magnesium salts.
Tilsetningen av magnesiumforbindelser samt kompleksdannere for disse og/eller ferdigdannede komplekse magnesiumsalter, har som viktigste oppgave å beskytte karbohydratene mot angrep i forbindelse med avlignifisering av trecellulose. Tidligere kjente kompleksdannere henholdsvis komplekse forbindelser i disse sammenheng er organiske karboksylsyrer, f.eks. hydroksysyrer og andre syrer inneholdende elementene C, 0 og H eller .salter derav eller polyfosforsyrer henholdsvis salter derav. The addition of magnesium compounds as well as complex formers for these and/or pre-formed complex magnesium salts, has the main task of protecting the carbohydrates from attack in connection with delignification of wood cellulose. Previously known complex formers or complex compounds in this context are organic carboxylic acids, e.g. hydroxy acids and other acids containing the elements C, O and H or salts thereof or polyphosphoric acids or salts thereof.
Gjennom det norske patent 128.372 som angår alkalisk oksygengassbehandling av celluloseholdig materiale, er det tidligere kjent å underkaste cellulosemasse en forbehandling hvor det benyttes kompleksdannere for katalytisk aktive tung-metallforbindelser. Som eksempel på slike kompleksdannere kan man nevne nitrogenholdige polykarboksylsyrer. Disse forbindelser danner under forbehandlingstrinnet komplekser med tungmetaller som finnes i massen, eksempelvis kobber, kobolt, jern og mangan. Through Norwegian patent 128,372, which concerns alkaline oxygen gas treatment of cellulosic material, it is previously known to subject cellulose pulp to a pre-treatment where complex formers for catalytically active heavy metal compounds are used. Examples of such complex formers include nitrogen-containing polycarboxylic acids. During the pre-treatment step, these compounds form complexes with heavy metals found in the mass, for example copper, cobalt, iron and manganese.
Det har nå overraskende vist seg at den ovenfor angitte type av forbindelser også egner seg meget vel som kompleksdannere for magnesium ved alkalisk oksygenbehandling av celluloseholdig materiale, eksempelvis cellulosemasse. Om magnesiumsalter brukes i kombinasjon med nitrogenholdige polykarboksylsyrer eller salter av disse og/eller om ferdigdannede slike magnesiumkomplekser tilsettes ved prosessen, oppnår man i sammenligning med tidligere kjent teknikk en betraktelig øket beskytteIsesvirkning. It has now surprisingly turned out that the type of compounds indicated above are also very suitable as complex formers for magnesium in alkaline oxygen treatment of cellulose-containing material, for example cellulose pulp. If magnesium salts are used in combination with nitrogen-containing polycarboxylic acids or salts thereof and/or if ready-made such magnesium complexes are added during the process, a considerably increased protective effect is achieved in comparison with prior art.
Det har vist seg spesielt fordelaktig at kompleks-danneren utgjøres av, respektivt at det i magnesiumkomplekset inngår aminopolykarboksylsyrer av typen: It has proven particularly advantageous that the complex-former consists of, respectively that the magnesium complex includes aminopolycarboxylic acids of the type:
eller alkalisalter av disse, hvor A er gruppen -CH2COOH eller or alkali salts thereof, where A is the group -CH2COOH or
-CH2CH2OH og n er et helt tall fra 0-5. -CH2CH2OH and n is an integer from 0-5.
■.Spesielt egnede forbindelser fra denne gruppe er nitrilotrieddiksyre (NTA), etylendiamintetraeddiksyre (EDTA), dietylentriaminpentaeddiksyre, hydroksyetyletylendiamintrieddik-syre og alkalisalter derav, hvilke forbindelser har vist seg å ha meget tilfredsstillende bestandighet i det benyttede oksyde-rende miljø. .Det er spesielt fordelaktig å tilføre en så stor mengde kompleksdannere respektivt et kompleks med en slik sam-mensetning, at det oppnås en homogen oppløsning i det ved behandlingen rådende alkaliske miljø og at en utfelling av tungt oppløselige magnesiumforbindelser, f.eks. magnesiumhydroksyd, helt unngås. Således unngår man at tungt oppløselige.magnesiumforbindelser avsetter seg på og i trecellulosen hvor de kan hindre en jevn avlignifisering av materialet. ■.Especially suitable compounds from this group are nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid, hydroxyethylethylenediaminetriacetic acid and alkali salts thereof, which compounds have been shown to have very satisfactory stability in the oxidizing environment used. It is particularly advantageous to add such a large amount of complex formers, respectively a complex with such a composition, that a homogeneous solution is achieved in the alkaline environment prevailing during the treatment and that a precipitation of poorly soluble magnesium compounds, e.g. magnesium hydroxide, is completely avoided. In this way, it is avoided that poorly soluble magnesium compounds are deposited on and in the wood cellulose, where they can prevent an even delignification of the material.
Ifølge en spesielt fordelaktig utførelsesform av oppfinnelsen kan det foruten magnesiumsalter i kombinasjon med kompleksdannere bestående av nitrogenholdige polykarboksylsyrer eller salter derav og/eller ferdigdannede magnesiumkomplekser av slike syrer, også tilføre andre kompleksdannere, f.eks. slike som finnes i avluter fra alkalisk behandling av cellulose. Luter fra prosessen inneholdende blant annet alkalisalter av hydroksysyrer, slik som sakkarinsyrer, dihydroksysmørsyre og melkesyre, kan således med fordel tilbakeføres til prosessen. En spesiell fordel ligger i at de komplekse magnesiumsalter som foreligger i avluten ifølge foreliggende oppfinnelse er helt oppløselige og at prosessen, når tilbakeføring av lut benyttes, kan gjennomføres med anvendelse av meget små mengder magnesiumforbindelser respektivt kompleksdannere. According to a particularly advantageous embodiment of the invention, in addition to magnesium salts in combination with complex formers consisting of nitrogen-containing polycarboxylic acids or salts thereof and/or ready-made magnesium complexes of such acids, other complex formers can also be added, e.g. such as are found in effluents from alkaline treatment of cellulose. Lyes from the process containing, among other things, alkali salts of hydroxy acids, such as saccharin acids, dihydroxybutyric acid and lactic acid, can thus be advantageously returned to the process. A particular advantage lies in the fact that the complex magnesium salts present in the waste liquor according to the present invention are completely soluble and that the process, when returning liquor is used, can be carried out using very small amounts of magnesium compounds or complex formers.
Dersom fremgangsmåten foretas uten tilbakeføring av avlut, er den egnede tilsetning av magnesiumforbindelser 0,005 - 0,5 %, fortrinnsvis o,ol - o,2 %, beregnet som MgO på massens vekt. Ved tilbakeføring av avlut kan tilsetningen imidlertid være betydelig mindre, f.eks. halvparten av det ovenfor angitte eller enda lavere. Mengden av kompleksdannere av den angitte type bør velges slik at det ikke oppnås noen utfelling, det være seg i oppløsningen eller på fiberen i det alkaliske miljø som råder i behandlingstrinnet. En egnet mengde er fra 0,5 mol kompleksdanner pr. mol magnesium til 15 mol kompleksdanner pr. mol magnesium. Det har overraskende nok vist seg at et over-skudd av kompleksdanner, f.eks. 8-12 mol pr. mol magnesium, i visse tilfeller kan lede til en forbedret beskyttende virkning på cellulosen. If the process is carried out without return of waste liquor, the suitable addition of magnesium compounds is 0.005 - 0.5%, preferably o.ol - o.2%, calculated as MgO on the weight of the mass. In the case of waste liquor return, however, the addition can be significantly less, e.g. half of the above or even lower. The amount of complexing agents of the indicated type should be chosen so that no precipitation is obtained, be it in the solution or on the fiber in the alkaline environment prevailing in the treatment step. A suitable amount is from 0.5 mol complex former per mol of magnesium to 15 mol of complex former per moles of magnesium. Surprisingly enough, it has been shown that an excess of complex formers, e.g. 8-12 moles per moles of magnesium, in certain cases can lead to an improved protective effect on the cellulose.
Oppfinnelsen skal belyses ved hjelp av følgende utførelseseksempler. The invention shall be illustrated by means of the following examples.
Eksempel 1 Example 1
Ubleket furusulfatmasse med kappatall 33,9 og viskosi-tet ll8l cm^/g ifølge SCAN (170 cP ifølge TAPPI), ble behandlet på følgende måte. Unbleached pine sulphate pulp with a kappa number of 33.9 and a viscosity of 118l cm^/g according to SCAN (170 cP according to TAPPI) was treated in the following way.
Massen ble findelt i en pinnriver ved 30 % tørrinn-hold, hvoretter vann og natriumhydroksyd ble tilsatt slik at det ble oppnådd en massekonsentrasjon på 3 Massesuspensjonen ble utsatt for kraftig omrøring med en propellrører og det ble foretatt tilsetninger ifølge det nedenfor angitte. Massen ble frafiltrert og deretter presset til et tørrinnhold på 27 % var oppnådd, hvoretter den ble revet i en pinnriver. Oksygengassbehandlingen ble utført ved et oksygengasstrykk på 8 kp/cm 2 ved 100°C i 15 min., hvoretter massen ble tatt ut og vasket med vann. The pulp was finely divided in a stick grater at 30% dry content, after which water and sodium hydroxide were added so that a pulp concentration of 3 was achieved. The mass was filtered off and then pressed until a dry content of 27% was achieved, after which it was shredded in a stick grater. The oxygen gas treatment was carried out at an oxygen gas pressure of 8 kp/cm 2 at 100°C for 15 min., after which the mass was taken out and washed with water.
I forsøk 1, som ble foretatt uten andre tilsetninger enn vann og NaOH, inneholdt massen 3,2 % NaOH, beregnet på tørr masse, under oksygengassbehandlingen. In test 1, which was carried out without additions other than water and NaOH, the mass contained 3.2% NaOH, calculated on dry mass, during the oxygen gas treatment.
I forsøk -2 ble magnesiumsulfat tilsatt- til avlut, som var avpresset fra masse som igjen var oksygengassbehandlet ifølge forsøk 1, hvorved hydroksykarboksyIsyrene i avluten tjenestegjorde som kompleksdannere. Pressingen ble utført før vaskingen av massen. Den med magnesiumsulfat tilsatte avlut, som ble benyttet for å erstatte 1/50 av tilsatt vannmengde i forsøk 1, ble innblandet i massen sammen med vann og natriumhydroksyd, hvoretter forsøket ble utført på samme måte som i In experiment 2, magnesium sulfate was added to waste liquor, which had been pressed from pulp which had again been treated with oxygen gas according to experiment 1, whereby the hydroxycarboxylic acids in the waste liquor served as complex formers. The pressing was carried out before the washing of the pulp. The magnesium sulfate-added waste liquor, which was used to replace 1/50 of the added amount of water in experiment 1, was mixed into the mass together with water and sodium hydroxide, after which the experiment was carried out in the same way as in
■forsøk 1. Under oksygengassbehandlingen inneholdt massen 3,7 % natriumhydroksyd. ■experiment 1. During the oxygen gas treatment, the mass contained 3.7% sodium hydroxide.
Forsøk 3 ble utført som forsøk 1, men med tilsetning (ved 3 t massekonsentrasjon) av en vannoppløsning inneholdende en kompleksforbindelse av magnesium og etylendiamintetraeddik--syre (EDTA). Under oksygengassbehandlingen inneholdt mas.sen 3,3 % natriumhydroksyd. Experiment 3 was carried out as experiment 1, but with the addition (at 3 t mass concentration) of a water solution containing a complex compound of magnesium and ethylenediaminetetraacetic acid (EDTA). During the oxygen gas treatment, the mass contained 3.3% sodium hydroxide.
Forsøk 4 ble utført som forsøk 2, men med tilsetning av EDTA til -den avpressede luten før tilsetningen til massen. Under oksygengassbehandlingen inneholdt massen 3,3 % natriumhydroksyd-. Experiment 4 was carried out as experiment 2, but with the addition of EDTA to the pressed lye before the addition to the pulp. During the oxygen gas treatment, the mass contained 3.3% sodium hydroxide.
Forsøk 5 ble utført som forsøk 3, men i dette forsøk ble dietylentriaminpentaeddiksyre benyttet i stedet for EDTA. Under oksygengassbehandlingen inneholdt massen 3,3 % natriumhydroksyd. Experiment 5 was carried out as experiment 3, but in this experiment diethylenetriaminepentaacetic acid was used instead of EDTA. During the oxygen gas treatment, the pulp contained 3.3% sodium hydroxide.
Ved forsøkene ble følgende resultater oppnådd: During the experiments, the following results were obtained:
Forsøkene viser at stor forbedring av massens viskosi-tet kan oppnås ved oksygengassbleking dersom et magnesiumkompleks tilsettes. Ved anvendelse av bare fortynnet avlut som kompleksdanner, oppnås imidlertid en risiko for dannelse av magnesiumhydroksyd som i stor utstrekning følger med massen. Dette inne-bærer øket forbruk av magnesiumforbindelse og natriumhydroksyd. Ved tilsetning av ytterligere kompleksdanner av den ifølge foreliggende oppfinnelse angitte type (slik som EDTA) kan utfelling av magnesiumforbindelser helt unngås. En meget god effekt oppnås også ved anvendelse av bare kompleksdanner ifølge oppfinnelsen uten at avlut fra prosessen anvendes som kompleksdanner. Foreliggende oppfinnelse muliggjør som vist ovenfor en reduse-ring av mengden magnesiumforbindelse med hele 66 %, hvilket er av stor økonomisk betydning. The experiments show that a large improvement in the viscosity of the mass can be achieved by oxygen gas bleaching if a magnesium complex is added. However, when only diluted waste liquor is used as a complexing agent, there is a risk of magnesium hydroxide being formed, which to a large extent accompanies the mass. This entails increased consumption of magnesium compound and sodium hydroxide. By adding additional complex formers of the type specified according to the present invention (such as EDTA), precipitation of magnesium compounds can be completely avoided. A very good effect is also achieved by using only complex formers according to the invention without effluents from the process being used as complex formers. As shown above, the present invention makes it possible to reduce the amount of magnesium compound by as much as 66%, which is of great economic importance.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE02732/70A SE353749B (en) | 1970-03-02 | 1970-03-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO133594B true NO133594B (en) | 1976-02-16 |
| NO133594C NO133594C (en) | 1976-05-26 |
Family
ID=20260555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO758/71A NO133594C (en) | 1970-03-02 | 1971-03-01 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3701712A (en) |
| JP (1) | JPS5022601B1 (en) |
| AT (1) | AT311169B (en) |
| BR (1) | BR7101287D0 (en) |
| DE (1) | DE2109542C3 (en) |
| FI (1) | FI55531C (en) |
| FR (1) | FR2084031A5 (en) |
| NO (1) | NO133594C (en) |
| SE (1) | SE353749B (en) |
| ZA (1) | ZA711271B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5027081B2 (en) * | 1971-11-10 | 1975-09-05 | ||
| US4045279A (en) * | 1972-01-17 | 1977-08-30 | Toyo Pulp Co., Ltd. | Process for the manufacture of pulp using sodium carbonate and oxygen |
| US4089737A (en) * | 1974-02-18 | 1978-05-16 | Toyo Pulp Company, Ltd. | Delignification of cellulosic material with an alkaline aqueous medium containing oxygen dissolved therein |
| US4087318A (en) * | 1974-03-14 | 1978-05-02 | Mo Och Domsjo Aktiebolag | Oxygen-alkali delignification of lignocellulosic material in the presence of a manganese compound |
| SE393138B (en) * | 1974-03-14 | 1977-05-02 | Mo Och Domsjoe Ab | PROCEDURE FOR BLEACHING CELLULOSA WITH AN ACID CONTAINING GAS IN THE PRESENCE OF SODIUM BICARBONATE |
| US4338158A (en) * | 1976-04-09 | 1982-07-06 | Weyerhaeuser Company | Pulping in the presence of a protector |
| US4172006A (en) * | 1976-08-26 | 1979-10-23 | Weyerhaeuser Company | Method of delignifying wood chips with oxygen by adding cooking liquor under pressure |
| CA1079457A (en) * | 1976-09-13 | 1980-06-17 | Robert C. Eckert | Manganic ion bleaching process |
| US4197168A (en) * | 1978-06-07 | 1980-04-08 | Scm Corporation | Recovery of anthraquinone from tall oil |
| US4594130A (en) * | 1978-11-27 | 1986-06-10 | Chang Pei Ching | Pulping of lignocellulose with aqueous alcohol and alkaline earth metal salt catalyst |
| FR2457338A1 (en) * | 1979-05-25 | 1980-12-19 | Interox | Protecting cellulosic material during alkaline treatment - by adding hydroxy-carboxylated polymer to the soln. |
| US5770010A (en) * | 1995-04-20 | 1998-06-23 | R-J Holding Company | Pulping process employing nascent oxygen |
| US20020129911A1 (en) * | 2000-10-16 | 2002-09-19 | Marcoccia Bruno S. | Process and configuration for providing external upflow/internal downflow in a continuous digester |
| WO2005047599A2 (en) * | 2003-11-08 | 2005-05-26 | Lally Thomas J | Method for manufacturing fire-retardant cellulose-based materials |
| WO2012034087A1 (en) * | 2010-09-10 | 2012-03-15 | Synthetic Genomics, Inc. | Solubilization of coal or lignocellulose biomass |
| US20130233340A1 (en) * | 2012-03-07 | 2013-09-12 | Paul Sapan | Flavored Function Specific Toothpicks |
| CA3127736A1 (en) * | 2019-01-31 | 2020-08-06 | Organofuel Sweden Ab | A process for the production of oxidized wood products |
-
1970
- 1970-03-02 SE SE02732/70A patent/SE353749B/xx unknown
-
1971
- 1971-02-26 FI FI583/71A patent/FI55531C/en active
- 1971-02-26 ZA ZA711271A patent/ZA711271B/en unknown
- 1971-02-26 US US119369A patent/US3701712A/en not_active Expired - Lifetime
- 1971-03-01 DE DE2109542A patent/DE2109542C3/en not_active Expired
- 1971-03-01 NO NO758/71A patent/NO133594C/no unknown
- 1971-03-01 FR FR7106969A patent/FR2084031A5/fr not_active Expired
- 1971-03-02 AT AT178371A patent/AT311169B/en not_active IP Right Cessation
- 1971-03-02 JP JP46010410A patent/JPS5022601B1/ja active Pending
- 1971-03-02 BR BR1287/71*[A patent/BR7101287D0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US3701712A (en) | 1972-10-31 |
| DE2109542C3 (en) | 1974-06-12 |
| FI55531C (en) | 1979-08-10 |
| DE2109542A1 (en) | 1971-09-16 |
| SE353749B (en) | 1973-02-12 |
| FR2084031A5 (en) | 1971-12-17 |
| ZA711271B (en) | 1971-11-24 |
| NO133594C (en) | 1976-05-26 |
| BR7101287D0 (en) | 1973-06-07 |
| DE2109542B2 (en) | 1973-11-08 |
| JPS5022601B1 (en) | 1975-08-01 |
| AT311169B (en) | 1973-11-12 |
| FI55531B (en) | 1979-04-30 |
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