EP0034219A1 - Process for bleaching cellulose pulps by means of organic peracids - Google Patents
Process for bleaching cellulose pulps by means of organic peracids Download PDFInfo
- Publication number
- EP0034219A1 EP0034219A1 EP80108011A EP80108011A EP0034219A1 EP 0034219 A1 EP0034219 A1 EP 0034219A1 EP 80108011 A EP80108011 A EP 80108011A EP 80108011 A EP80108011 A EP 80108011A EP 0034219 A1 EP0034219 A1 EP 0034219A1
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- EP
- European Patent Office
- Prior art keywords
- peroxide
- bleaching
- peracid
- acid
- pulp
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- 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.)
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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
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
Definitions
- the pulp obtained chemically e.g. accruing from the sulfite process or the alkaline baking soda or sulfate process contain, in addition to the main component cellulose, small amounts of lignin, hemicelluloses and some other components.
- the pulp is washed extensively with water.
- the object of the invention is a process for the bleaching of pulp using peroxides in alkaline B e-rich and organic peracid in the acidic range, wherein the bleaching stage with peracid followed by a bleaching stage with peroxide, which is characterized in that a peracid has a hydrogen peroxide content of 10 to 50% by weight and a peracid content of 5 to 40% by weight, and which is obtained from an organic carboxylic acid in a concentration of 50 to 100% by weight, preferably 90 to 100% by weight .-%, by reaction with hydrogen peroxide at a concentration of 30 to 90 wt .-%, preferably 50 to 70 wt .-%, in the presence of a mineral acid at a temperature between 20 and 100 ° C, preferably 50 to 80 ° C.
- the excess peroxide remaining from the acidic peracid bleaching stage is used for the peroxide bleaching.
- Acetic acid or propionic acid can be used as carboxylic acids.
- the amounts of peracid can be 0.1 to 5.0% by weight and those of peroxide 0.2 to 3.0% by weight, based on dry cellulose.
- the temperatures in the bleaching stages can be between 30 and 140 ° C, preferably between 40 and 90 ° C.
- the consistency in the peracid bleaching stage can be between 5 and 30%, preferably 10 to 15%, based on dry cellulose.
- the pulp consistency 5 to 25 G ew .-% can be preferably 10 to 15 wt .-%, based on absolutely dry pulp.
- the chloride-free waste water can be evaporated after the peroxide bleaching stage and fed to the incineration. It is possible to do the evaporation after neutralizing the waste water recover carboxylic acid used in the production of peracids.
- the process according to the invention can optionally be repeated in a bleaching tower suitable for displacement bleaching, the displaced peracid solution being mixed with alkali and fed back to the bleaching tower for peroxide bleaching.
- Dispensing with the washing of the pulp according to the peracid level makes it possible, after alkalization by adding a sodium hydroxide solution, to use the entire content of hydrogen peroxide in the pulp for further bleaching. This means that an equilibrium percarboxylic acid can be used economically even with a high peroxide content, or that an equilibrium does not have to be waited for.
- variable b a mixture of H 2 0 2 and peracetic acid (1: 1) is used by the process according to the invention (variant b), which is obtained by reacting H 2 0 2 (70%) with glacial acetic acid in the presence of catalytic amounts of sulfuric acid at 60 ° C. and an hour's reaction time was obtained, only 1.25 kg of glacial acetic acid are required for bleaching 100 kg of cellulose.
- the H 2 O 2 / peracetic acid mixture (1.6: 1) required for bleaching 100 kg of pulp is made from H 2 O 2 (50%) and glacial acetic acid in the presence of catalytic amounts of sulfuric acid at 60 ° C and a reaction time of 1 hour with only 0.88 kg of acetic acid.
Abstract
Description
Die auf chemischem Wege gewonnen Zellstoffe, wie sie z.B. aus dem Sulfitverfahren oder den alkalischen Natron- oder Sulfatverfahren anfallen, enthalten neben den Hauptbestandteil Cellulose noch geringe Mengen Lignin, Hemicellulosen und einige andere Bestandteile. Die genannten Begleitstoffe der Cellulose, vor allem das Lignin, bewirken die Verfärbung des Zellstoffes oder daraus hergestellter Produkte.The pulp obtained chemically, e.g. accruing from the sulfite process or the alkaline baking soda or sulfate process contain, in addition to the main component cellulose, small amounts of lignin, hemicelluloses and some other components. The accompanying cellulose substances, especially lignin, cause discoloration of the cellulose or products made from it.
Um aus dem Zellstoff Papier oder andere Produkte von hoher Weiße, die nicht zur Vergilbung neigen, herzustellen, ist eine Entfernung der nach dem chemischen Aufschluß verbliebenen Begleitstoffe durch eine Mehrstufenbleiche notwendig.In order to produce paper or other products of high whiteness which do not tend to yellowing from the pulp, it is necessary to remove the accompanying substances which have remained after the chemical digestion by means of multi-stage bleaching.
Es ist aus der DE-PS 22 19 505 bekannt, Zellstoff in einem mehrstufigen Verfahren mittels Peroxid und Persäuren zu bleichen. Dabei wird der Zellstoff, gegebenenfalls nach einer sauren Vorbehandlung, in der ersten Stufe mit einem Peroxid, in der zweiten Stufe mit einer organischen Persäure und in der dritten Stufe mit einem Peroxid gebleicht.It is known from DE-PS 22 19 505 to bleach pulp in a multi-stage process using peroxide and peracids. The pulp, optionally after an acidic pretreatment, is bleached with a peroxide in the first stage, with an organic peracid in the second stage and with a peroxide in the third stage.
Zwischen den einzelnen Bleichstufen wird der Zellstoff ausgiebig mit Wasser gewaschen.Between the individual bleaching stages, the pulp is washed extensively with water.
Ein erheblicher Nachteil des bekannten Verfahrens liegt darin, daß zur Bleiche mit Persäure eine Gleichgewichtsperessigsäure eingesetzt wird. Denn bei der Darstellung der Gleichgewichtspersäure muß ein sehr hoher Überschuß an Carbonsäure eingesetzt werden, um das Gleichgewicht möglichst weit auf die Seite der Persäure zu verschieben. Das nicht zur Persäure umgesetzte Wasserstoffperoxid geht nämlich bei der an die Persäurebleichstufe anschließende Wäsche des Zellstoffes verloren.A considerable disadvantage of the known method is that an equilibrium peracetic acid is used for bleaching with peracid. For the representation of the G leichgewichtspersäure a very high excess must be used of carboxylic acid, to shift the equilibrium far as possible on the side of the peracid. The hydrogen peroxide not converted to the peracid is namely lost during the washing of the pulp after the peracid bleaching stage.
Bei dem bekannten Verfahren wird eine Gleichgewichtspersäure eingesetzt, bei deren Herstellung ein 8- bis 10-facher Überschuß an Carbonsäure verwendet wird.In the known method, an equilibrium persic acid is used, in the production of which an 8 to 10-fold excess of carboxylic acid is used.
Aufgrund der dazu benötigten Carbonsäuremengen ist das bekannte Bleichverfahren unwirtschaftlich.Because of the amounts of carboxylic acid required for this, the known bleaching process is uneconomical.
Eine Verringerung dieses überschußes spart zwar Carbonsäure, führt aber zu einem höheren Restgehalt an Wasserstoffperoxid und somit zu einem ebenfalls unwirtschaftlich hohen-Wasserstoffperoxidbedarf.A reduction in this excess saves carboxylic acid, but leads to a higher residual hydrogen peroxide content and thus to an uneconomically high hydrogen peroxide requirement.
Ein weiterer Nachteil des Verfahrens gemäß.der DE-PS 22 19 505 liegt darin, daß bei der Verwendung von Gleichgewichtspersäure aufgrund der langsamen Gleichgewichtseinstellung große Vorratsgefäße notwendig sind. So benötigt eine mittlere Zellstoffabrik bereits Reaktionsgefäße mit 3 einem Volumen bis zu 100 mAnother disadvantage of the method according to DE-PS 2 2 19 505 is that when using equilibrium persic acid, large storage vessels are necessary due to the slow establishment of equilibrium. A medium-sized pulp mill already requires 3 reaction vessels with a volume of up to 100 m
Die alternative Darstellung der Persäure aus Carbonsäureanhydrid ist, ebenso wie der Einsatz reiner Persäure, wegen der Gefährlichkeit konzentrierter organischer Perverbindungen aus Gründen der Betriebssicherheit nicht möglich.The alternative representation of peracid from carboxylic acid anhydride, like the use of pure peracid, is not possible due to the dangerous nature of concentrated organic per-compounds for reasons of operational safety.
So bildet sich bei der Reaktion von Carbonsäureanhydrid mit z.B. Wasserstoffperoxid neben der Persäure auch das gefährliche, zur spontanen Zersetzung neigende Diacylperoxid.Thus, when carboxylic anhydride reacts with e.g. In addition to peracid, hydrogen peroxide is also the dangerous diacyl peroxide, which tends to decompose spontaneously.
Auch die Darstellung von Persäure aus Carbonsäureanhydrid und Peroxid in der Zellstoffpulpe selbst, ist wegen der dann vorliegenden Verdünnung nur mit hohen Peroxidverlusten durchzuführen.Also, the representation of peracid from carboxylic acid anhydride and peroxide in the pulp itself can only be carried out with high peroxide losses because of the dilution then present.
Gegenstand der Erfindung ist ein Verfahren zur Bleiche von Zellstoff unter Verwendung von Peroxiden im alkalischen Be-reich und organischer Persäure im sauren Bereich, wobei auf die Bleichstufe mit Persäure eine Bleichstufe mit Peroxid folgt, welches dadurch gekennzeichnet ist, daß man eine Persäure, die einen Gehalt an Wasserstoffperoxid von 10 bis 50 Gew.-% und einen Gehalt an Persäure von 5 bis 40 Gew.-% aufweist, und die man aus einer organischen Carbonsäure einer Konzentration von 50 bis 100 Gew.-%, vorzugsweise 90 bis 100 Gew.-%, durch Umsetzung mit Wasserstoffperoxid einer Konzentration von 30 bis 90 Gew.-%, vorzugsweise 50 bis 70 Gew.-%, in Gegenwart einer Mineralsäure bei einer Temperatur zwischen 20 und 100°C, vorzugsweise 50 bis 80°C, herstellt, verwendet, nach der sauren Bleichstufe mit der organischen Persäure den Zellstoff nicht auswäscht, die zur Durchführung der alkalischen Bleichstufe mit Peroxid notwendige Menge an Alkali in Form einer wässrigen Lösung hinzufügt und die Bleiche mit Peroxid ohne weiteren Zusatz von Peroxid durchführt.The object of the invention is a process for the bleaching of pulp using peroxides in alkaline B e-rich and organic peracid in the acidic range, wherein the bleaching stage with peracid followed by a bleaching stage with peroxide, which is characterized in that a peracid has a hydrogen peroxide content of 10 to 50% by weight and a peracid content of 5 to 40% by weight, and which is obtained from an organic carboxylic acid in a concentration of 50 to 100% by weight, preferably 90 to 100% by weight .-%, by reaction with hydrogen peroxide at a concentration of 30 to 90 wt .-%, preferably 50 to 70 wt .-%, in the presence of a mineral acid at a temperature between 20 and 100 ° C, preferably 50 to 80 ° C. , used, after the acidic bleaching step with the organic peracid, does not wash out the pulp, adds the amount of alkali required to carry out the alkaline bleaching step with peroxide in the form of an aqueous solution and the bleaching with peroxide is carried out without further addition of peroxide.
Es wird dabei der aus der sauren Persäurebleichstufe verbleibende Überschuß an Peroxid für die Peroxidbleiche verwendet.The excess peroxide remaining from the acidic peracid bleaching stage is used for the peroxide bleaching.
Als Carbonsäuren können Essigsäure oder Propionsäure verwendet werden.Acetic acid or propionic acid can be used as carboxylic acids.
Die Mengen an Persäure können 0,1 bis 5,0 Gew.-% und die an Peroxid 0,2 bis 3,0 Gew.-%, bezogen auf atro Zellstoff, betragen. Die Temperaturen in den Bleichstufen können zwischen 30 und 140°C, vorzugsweise zwischen 40 und 90°C liegen. Die Stoffdichte kann bei der Persäurebleichstufe zwischen 5 und 30 %, vorzugsweise 10 bis 15 %, bezogen auf atro Zellstoff betragen.The amounts of peracid can be 0.1 to 5.0% by weight and those of peroxide 0.2 to 3.0% by weight, based on dry cellulose. The temperatures in the bleaching stages can be between 30 and 140 ° C, preferably between 40 and 90 ° C. The consistency in the peracid bleaching stage can be between 5 and 30%, preferably 10 to 15%, based on dry cellulose.
Bei der Peroxidbleichstufe kann die Stoffdichte 5 bis 25 Gew.-%, vorzugsweise 10 bis 15 Gew.-%, bezogen auf atro Zellstoff betragen.In the peroxide bleaching the pulp consistency 5 to 25 G ew .-%, can be preferably 10 to 15 wt .-%, based on absolutely dry pulp.
Bei schwer bleichbaren Zellstoffen kann die Bleichstufen.. folge Persäure/Peroxid wiederholt werden. Es ist jedoch auch möglich, vor der Bleichsequenz Persäure/ Peroxid eine zusätzliche alkalische Peroxidbleichstufe durchzuführen.In the case of pulp that is difficult to bleach, the bleaching steps .. follow peracid / peroxide can be repeated. However, it is also possible to carry out an additional alkaline peroxide bleaching step before the peracid / peroxide bleaching sequence.
Im Anschluß an das erfindungsgemäße Bleichverfahren können weitere bekannte Bleichstufen, wie z.B. mit Hypochlorit oder Chlordioxid, durchgeführt werden.Following the bleaching process according to the invention, further known bleaching stages, e.g. with hypochlorite or chlorine dioxide.
Aufgrund des erfindungsgemäßen Verfahrens kann das chloridfreie Abwasser nach der Peroxidbleichstufe eingedampft und der Verbrennung zugeführt werden. Dabei ist es möglich, bei der Eindampfung nach der Neutralisation des Abwassers die für die Persäureherstellung verwendete Carbonsäure zurückzugewinnen.On the basis of the method according to the invention, the chloride-free waste water can be evaporated after the peroxide bleaching stage and fed to the incineration. It is possible to do the evaporation after neutralizing the waste water recover carboxylic acid used in the production of peracids.
Das erfindungsgemäße Verfahren kann in einem zur Verdrängungsbleiche geeigneten Bleichturm gegebenenfalls wiederholt, durchgeführt werden, wobei die verdrängte Persäurelösung nach der Mischung mit Alkali dem Bleichturm wieder zur Peroxidbleiche zugeführt wird.The process according to the invention can optionally be repeated in a bleaching tower suitable for displacement bleaching, the displaced peracid solution being mixed with alkali and fed back to the bleaching tower for peroxide bleaching.
Der Verzicht auf die Wäsche des Zellstoffes nach der Persäurestufe erlaubt es, nach einer Alkalisierung durch Zugabe einer Natronlauge-Lösung, den gesamten Gehalt der Pulpe an Wasserstoffperoxid zur weiteren Bleiche zu nutzen. Dies bedeutet, daß eine Gleichgewichtspercarbonsäure auch mit hohem Peroxidgehalt wirtschaftlich genutzt werden kann, oder daß eine Gleichgewichtseinstellung nicht abgewartet werden muß.Dispensing with the washing of the pulp according to the peracid level makes it possible, after alkalization by adding a sodium hydroxide solution, to use the entire content of hydrogen peroxide in the pulp for further bleaching. This means that an equilibrium percarboxylic acid can be used economically even with a high peroxide content, or that an equilibrium does not have to be waited for.
Aufgrund dessen kann einerseits mit erheblich geringeren Carbonsäuremengen gearbeitet werden und andererseits können auch sehr viel kleinere Reaktoren zur Darstellung der bei der Bleiche benötigten Persäuremengen zur Anwendung kommen. Diese können dann im Durchfluß betrieben werden, was zusätzlich zur Sicherheit des Verfahrens beiträgt. So können beispielsweise für eine 200 jato Zellstoff-Fabrik mit einem Bedarf von 1 % Persäure bei geeigneter Reaktionsführung mit nur 2,5 t Eisessig 2 t Peressigsäure in einem nur etwa 300 1/h fassenden Durchflußreaktor erzeugt werden.'Because of this, it is possible on the one hand to work with considerably smaller amounts of carboxylic acid and, on the other hand, very much smaller reactors can be used to display the amounts of peracid required for bleaching. These can then be operated in the flow, which additionally contributes to the safety of the process. Thus, for example, for a 200 tpy pulp mill with a requirement of 1% peracid and with a suitable reaction procedure, only 2.5 t of glacial acetic acid can be used to produce 2 t of peracetic acid in a flow reactor which only has about 300 l / h.
Dabei wird zwar nur die Hälfte des eingesetzten Wasserstoffperoxids zur Persäure umgesetzt. Das nicht zur Reaktion ge-5rachte Wasserstoffperoxid wird jedoch durch das erfindungsgemäße Verfahren zur weiteren Zellstoffbleiche wirksam verwendet.Only half of the hydrogen peroxide used is converted to peracid. However, the hydrogen peroxide not used for the reaction is used effectively by the process according to the invention for further pulp bleaching.
Gebleicht werden soll ein mittelharter Fichtensulfit-Papierzellstoff (18,5 Kappa) in drei Stufen auf einen Weißgehalt von über 88 (Elrepho F 6) mit der Bleichsequenz P-PES-P (peroxid-Persäure-Peroxid). Die angegebenen Prozentzahlen sind Gewichtsprozent.
- a) Nach dem in der DE-PS 22 19 505 beschriebenen Verfahren:
- 1. Stufe 2,2 % H202
2,2 % NaOH 1,5 Std. 18 % Stoffd. 60°C
Waschung - 2. Stufe 1,0 % Peressigsäure (als 10 % Gleichgewichtspersäure eingesetzt)
1 Std. 12 % Stoffd. 60°C
Waschung - 3. Stufe 1,0 % H2O2
2,0 % NaOH 2,5 Std. 12 % Stoffd. 60°C
Waschung
- 1. Stufe 2,2 % H202
- b) Nach dem erfindungsgemäßen Verfahren:
- 1. Stufe 2,2 % H2O2
2,2 % NaOH 1,5 Std. 18 % Stoffd. 60°C
Waschung - 2. Stufe 1,0 % H202
1,0 % Peressigsäure
1 Std. 12 % Stoffd. 60°C keine Wäsche sondern Einmischung von: - 3. Stufe 2,2 % NaOH 2,5 Std. 10 % Stoffd. 60°C
Waschung
- 1. Stufe 2,2 % H2O2
- Nach a) wird ein Weißgehalt von 88,7,
- nach b) ein Weißgehalt von 88,4 erhalten.
- a) According to the method described in DE-PS 22 19 505:
- 1st stage 2.2% H 2 0 2
2.2% NaOH 1.5 hrs 18% substance 60 ° C
Ablution - 2nd stage 1.0% peracetic acid (used as 10% equilibrium peracid)
1 hour 12% substance 60 ° C
Ablution - 3rd stage 1.0% H 2 O 2
2.0% NaOH 2.5 hrs. 12% substance. 60 ° C
Ablution
- 1st stage 2.2% H 2 0 2
- b) According to the method according to the invention:
- 1st stage 2.2% H 2 O 2
2.2% NaOH 1.5 hrs 18% substance 60 ° C
Ablution - 2nd stage 1.0% H 2 0 2
1.0% peracetic acid
1 hour 12% substance 60 ° C no laundry but interference from: - 3rd stage 2.2% NaOH 2.5 hours 10% substance 60 ° C
Ablution
- 1st stage 2.2% H 2 O 2
- According to a), the white content is 88.7,
- obtained a white content of 88.4 according to b).
Für die Bleiche von 100 kg Zellstoff nach Variante a) ergibt sich bei der Anwendung einer handelsüblichen 10 % Peressigsäure-Lösung ein Bedarf von 8,5 kg Eisessig.For the bleaching of 100 kg of pulp according to variant a), when using a commercial 10% peracetic acid solution, 8.5 kg of glacial acetic acid are required.
Setzt man dagegen nach dem erfindungsgemäßen Verfahren (Variante b) ein Gemisch von H202 und Peressigsäure (1:1) ein, das durch Umsetzung von H202 (70 %) mit Eisessig in Gegenwart katalytischer Mengen Schwefelsäure bei 60°C und einer Stunde Reaktionszeit erhalten wurde, so werden hier für die Bleiche von 100 kg Zellstoff nur 1,25 kg Eisessig benötigt.If, on the other hand, a mixture of H 2 0 2 and peracetic acid (1: 1) is used by the process according to the invention (variant b), which is obtained by reacting H 2 0 2 (70%) with glacial acetic acid in the presence of catalytic amounts of sulfuric acid at 60 ° C. and an hour's reaction time was obtained, only 1.25 kg of glacial acetic acid are required for bleaching 100 kg of cellulose.
Hier soll ein Buchensulfit-Kunstfaserzellstoff mit der Bleichfolge PES-P-H (Persäure-Peroxid-Hypochlorit) gebleicht werden. Die angegebenen Prozentzahlen sind Gewichtsprozent.
- a) Nach dem in der DE-PS 22 19 505 beschrieben Verfahren:
- 1. Stufe 0,5 % Peressigsäure 1 Std. 12 % Stoffd. 70°C
Waschung - 2. Stufe 0,8 % H202
6,0 % NaOH 1,5 Std. 10 % Stoffd. 80 °C Waschung - 3. Stufe 0,4 % NaOCl 3,0 Std. 10 % Stoffd. 40°C
Waschung
- 1. Stufe 0,5 % Peressigsäure 1 Std. 12 % Stoffd. 70°C
- b) Nach dem erfindungsgemäßen Verfahren:
- 1. Stufe 0,5 % Peressigsäure 1 Std. 12 % Stoffd. 70°C 0,8 % H2O2
keine Wäsche, sondern Einmischung von: - 2. Stufe 6,0 % NaOH 1,5 Std. 10 % Stoffd. 80°C
Waschung - 3. Stufe 0,4 % NaOCl 3 Std. 10 % Stoffd. 40°C
Waschung
- 1. Stufe 0,5 % Peressigsäure 1 Std. 12 % Stoffd. 70°C 0,8 % H2O2
- a) According to the method described in DE-PS 22 19 505:
- 1st stage 0.5% peracetic acid 1 hour 12% substance 70 ° C
Ablution - 2nd stage 0.8% H 2 0 2
6.0% NaOH 1.5 hrs. 10% substance. 80 ° C Ablution - 3rd stage 0.4% NaOCl 3.0 hrs 10% substance 40 ° C
Ablution
- 1st stage 0.5% peracetic acid 1 hour 12% substance 70 ° C
- b) According to the method according to the invention:
- 1st stage 0.5% peracetic acid 1 hour 12% substance 70 ° C 0.8% H 2 O 2
no laundry, but interference from: - 2nd stage 6.0% NaOH 1.5 hrs. 10% substance. 80 ° C
Ablution - 3rd stage 0.4% NaOCl 3 hours 10% substance. 40 ° C
Ablution
- 1st stage 0.5% peracetic acid 1 hour 12% substance 70 ° C 0.8% H 2 O 2
Es ergeben sich erhebliche Einsparungen an Essigsäure nach dem erfindungsgemäßen Verfahren. Bei Variante a) werden bei Verwendung einer 10 %igen Gleichgewichtsperessigsäure zur Bleiche von 100 kg Zellstoff 4,25 kg Eisessig benötigt.There are considerable savings in acetic acid by the process according to the invention. In variant a), when using a 10% equilibrium peracetic acid for bleaching 100 kg of cellulose, 4.25 kg of glacial acetic acid are required.
Nach dem erfindungsgemäßen Verfahren (Variante b) wird das zur Bleiche von 100 kg Zellstoff benötigte H2O2/Peressigsäure-Gemisch (1,6 : 1) aus H2O2 (50 %) und Eisessig in Gegenwart katalytischer Mengen Schwefelsäure bei 60°C und einer Rekationszeit von 1 Stunde mit nur 0,88 kg Essigsäure hergestellt.In the process according to the invention (variant b), the H 2 O 2 / peracetic acid mixture (1.6: 1) required for bleaching 100 kg of pulp is made from H 2 O 2 (50%) and glacial acetic acid in the presence of catalytic amounts of sulfuric acid at 60 ° C and a reaction time of 1 hour with only 0.88 kg of acetic acid.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80108011T ATE1826T1 (en) | 1980-02-16 | 1980-12-18 | PROCESS FOR BLEACHING PULP USING ORGANIC PERACID. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3005947 | 1980-02-16 | ||
DE3005947A DE3005947B1 (en) | 1980-02-16 | 1980-02-16 | Process for bleaching pulp using organic peracid |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0034219A1 true EP0034219A1 (en) | 1981-08-26 |
EP0034219B1 EP0034219B1 (en) | 1982-11-17 |
EP0034219B2 EP0034219B2 (en) | 1986-04-16 |
Family
ID=6094866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80108011A Expired EP0034219B2 (en) | 1980-02-16 | 1980-12-18 | Process for bleaching cellulose pulps by means of organic peracids |
Country Status (10)
Country | Link |
---|---|
US (1) | US4400237A (en) |
EP (1) | EP0034219B2 (en) |
JP (1) | JPS56128389A (en) |
AT (1) | ATE1826T1 (en) |
BR (1) | BR8100867A (en) |
CA (1) | CA1144711A (en) |
DE (2) | DE3005947B1 (en) |
FI (1) | FI68685C (en) |
NO (1) | NO155499B (en) |
ZA (1) | ZA81785B (en) |
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WO1992007139A1 (en) * | 1990-10-17 | 1992-04-30 | Interox International S.A. | Method for preserving the mechanical strength properties of chemical paper pulp |
EP0485829A1 (en) * | 1990-11-10 | 1992-05-20 | Akzo Nobel N.V. | Oxygene bleaching |
EP0634521A1 (en) * | 1993-07-16 | 1995-01-18 | Eka Nobel Ab | Method for bleaching lignocellulose-containing fibres |
Families Citing this family (29)
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JPS5721591A (en) * | 1980-07-11 | 1982-02-04 | Mitsubishi Gas Chemical Co | Peroxide bleaching of wood pulp |
AT378016B (en) * | 1982-12-02 | 1985-06-10 | Ver Edelstahlwerke Ag | METHOD FOR REMOVING AND / OR BLEACHING CELLULOSE MATERIAL, IN PARTICULAR CELLULAR, AND DEVICE FOR CARRYING OUT THE METHOD |
FI74750C (en) * | 1985-03-22 | 1988-03-10 | Keskuslaboratorio | Process for preparing bleached cellulose pulp from lignin-containing raw material. |
US4793898A (en) * | 1985-02-22 | 1988-12-27 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Process for bleaching organic peroxyacid cooked material with an alkaline solution of hydrogen peroxide |
US4859282A (en) * | 1988-04-15 | 1989-08-22 | E. I. Du Pont De Nemours And Company | Acid purification of product from alkaline peroxide processing of nonwoody lignocellulosic substrates |
FR2647641B1 (en) * | 1989-06-05 | 1992-01-17 | Atochem | PROCESS FOR THE MANUFACTURE OF BLEACHED VEGETABLE PULPES |
DE4114135A1 (en) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Chlorine-free bleaching and delignification of alkali cellulose - by first treating with aq. organic peracid soln. and then with cyanamide (salt) activated hydrogen peroxide soln. |
DE4114134A1 (en) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Chlorine-free bleaching and delignifying of alkali cellulose - by bleaching with aq. peracid, extracting with alkaline soln.,bleaching with aq. peracid and bleaching twice with cyanamide-activated hydrogen peroxide soln. |
ATE168149T1 (en) * | 1991-10-04 | 1998-07-15 | Solvay Interox Inc | METHOD FOR IMPROVING SELECTIVITY IN THE DELIGNIFIATION OF CHEMICAL PULP |
BE1006057A3 (en) * | 1992-07-06 | 1994-05-03 | Solvay Interox | Method for delignification of chemical pulp. |
ES2086183T3 (en) * | 1992-07-06 | 1996-06-16 | Solvay Interox | PROCEDURE FOR THE DELIGNIFICATION OF A CHEMICAL PAPER PASTE. |
GB2269191A (en) * | 1992-07-29 | 1994-02-02 | Solvay Interox Ltd | Method of treating aqueous process liquors |
US5589032A (en) * | 1992-09-21 | 1996-12-31 | North Carolina State University | Process for preparing a bleaching liquor containing percarboxylic acid and caro's acid |
ATE141972T1 (en) † | 1992-11-27 | 1996-09-15 | Eka Chemicals Ab | METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE |
FI98841C (en) * | 1994-06-20 | 1997-08-25 | Kemira Chemicals Oy | Process for delignifying a chemical pulp |
DE19516151A1 (en) | 1995-05-03 | 1996-11-07 | Sven Siegle | Process for the production of a pulp from cellulosic material, the pulp itself and its use |
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US5770011A (en) * | 1995-11-17 | 1998-06-23 | International Paper Company | Neutral monoperoxysulfate bleaching process |
FR2814180B1 (en) * | 2000-09-18 | 2003-12-05 | Michel Delmas | PROCESS FOR BLEACHING PAPER PULP IN AN ORGANIC MEDIUM WITH CONTROLLED HYDRATION |
US20040200588A1 (en) * | 2003-04-10 | 2004-10-14 | Walker Jayne M.A. | Method of controlling microorganisms in hydrogen peroxide pulp bleaching processes |
US7754460B2 (en) * | 2003-12-03 | 2010-07-13 | Danisco Us Inc. | Enzyme for the production of long chain peracid |
EP2664670B1 (en) | 2003-12-03 | 2015-05-06 | Danisco US Inc. | Perhydrolase |
US8476052B2 (en) * | 2003-12-03 | 2013-07-02 | Danisco Us Inc. | Enzyme for the production of long chain peracid |
US7297225B2 (en) * | 2004-06-22 | 2007-11-20 | Georgia-Pacific Consumer Products Lp | Process for high temperature peroxide bleaching of pulp with cool discharge |
FI121311B (en) | 2005-05-03 | 2010-09-30 | M Real Oyj | A process for the preparation of a mechanical pulp for use in the manufacture of paper and board |
WO2007067473A2 (en) * | 2005-12-06 | 2007-06-14 | Genencor International, Inc. | Perhydrolase epitopes |
US20090311395A1 (en) * | 2005-12-09 | 2009-12-17 | Cervin Marguerite A | ACYL Transferase Useful for Decontamination |
US20080087390A1 (en) * | 2006-10-11 | 2008-04-17 | Fort James Corporation | Multi-step pulp bleaching |
US8845860B2 (en) | 2010-09-16 | 2014-09-30 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
Citations (1)
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---|---|---|---|---|
DE2219505A1 (en) * | 1972-04-21 | 1973-11-08 | Degussa | CHLORINE-FREE MULTISTAGE BLEACHING OF PULP |
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US2394989A (en) * | 1942-03-11 | 1946-02-19 | Bonard Claude | Manufacture of cellulose |
US2730444A (en) * | 1950-10-10 | 1956-01-10 | British Celanese | Production of cellulose |
BE633420A (en) * | 1962-07-16 |
-
1980
- 1980-02-16 DE DE3005947A patent/DE3005947B1/en not_active Ceased
- 1980-12-18 DE DE8080108011T patent/DE3061114D1/en not_active Expired
- 1980-12-18 EP EP80108011A patent/EP0034219B2/en not_active Expired
- 1980-12-18 AT AT80108011T patent/ATE1826T1/en not_active IP Right Cessation
-
1981
- 1981-01-09 NO NO810057A patent/NO155499B/en unknown
- 1981-02-05 ZA ZA00810785A patent/ZA81785B/en unknown
- 1981-02-06 US US06/232,217 patent/US4400237A/en not_active Expired - Fee Related
- 1981-02-09 FI FI810366A patent/FI68685C/en not_active IP Right Cessation
- 1981-02-13 CA CA000370899A patent/CA1144711A/en not_active Expired
- 1981-02-13 BR BR8100867A patent/BR8100867A/en unknown
- 1981-02-16 JP JP2026381A patent/JPS56128389A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2219505A1 (en) * | 1972-04-21 | 1973-11-08 | Degussa | CHLORINE-FREE MULTISTAGE BLEACHING OF PULP |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992007139A1 (en) * | 1990-10-17 | 1992-04-30 | Interox International S.A. | Method for preserving the mechanical strength properties of chemical paper pulp |
BE1004630A3 (en) * | 1990-10-17 | 1992-12-22 | Interox Internat Sa | Method for preservation of strength characteristics of paper pulp chemicals. |
US5534115A (en) * | 1990-10-17 | 1996-07-09 | Interox International (Societe Anonyme) | Process for preserving the mechanical strength properties of chemical paper pulps |
EP0485829A1 (en) * | 1990-11-10 | 1992-05-20 | Akzo Nobel N.V. | Oxygene bleaching |
US5322647A (en) * | 1990-11-10 | 1994-06-21 | Akzo N.V. | Oxygen bleaching of cotton linters by disproportionation of hydrogen peroxide |
EP0634521A1 (en) * | 1993-07-16 | 1995-01-18 | Eka Nobel Ab | Method for bleaching lignocellulose-containing fibres |
Also Published As
Publication number | Publication date |
---|---|
ATE1826T1 (en) | 1982-12-15 |
DE3005947B1 (en) | 1981-01-29 |
ZA81785B (en) | 1982-03-31 |
EP0034219B2 (en) | 1986-04-16 |
DE3061114D1 (en) | 1982-12-23 |
NO155499B (en) | 1986-12-29 |
BR8100867A (en) | 1981-08-25 |
EP0034219B1 (en) | 1982-11-17 |
JPS56128389A (en) | 1981-10-07 |
CA1144711A (en) | 1983-04-19 |
FI68685B (en) | 1985-06-28 |
NO810057L (en) | 1981-08-17 |
US4400237A (en) | 1983-08-23 |
FI810366L (en) | 1981-08-17 |
FI68685C (en) | 1985-10-10 |
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