EP0262040B1 - Procédé de traitement d'une pâte papetière par une solution enzymatique - Google Patents

Procédé de traitement d'une pâte papetière par une solution enzymatique Download PDF

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Publication number
EP0262040B1
EP0262040B1 EP87402097A EP87402097A EP0262040B1 EP 0262040 B1 EP0262040 B1 EP 0262040B1 EP 87402097 A EP87402097 A EP 87402097A EP 87402097 A EP87402097 A EP 87402097A EP 0262040 B1 EP0262040 B1 EP 0262040B1
Authority
EP
European Patent Office
Prior art keywords
pulp
process according
enzymatic preparation
paper
enzymatic
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 - Lifetime
Application number
EP87402097A
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German (de)
English (en)
French (fr)
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EP0262040A1 (fr
Inventor
Jean-Luc Fuentes
Michel Robert
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.)
Cellulose du Pin SA
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Cellulose du Pin SA
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Application filed by Cellulose du Pin SA filed Critical Cellulose du Pin SA
Priority to AT87402097T priority Critical patent/ATE82339T1/de
Publication of EP0262040A1 publication Critical patent/EP0262040A1/fr
Application granted granted Critical
Publication of EP0262040B1 publication Critical patent/EP0262040B1/fr
Anticipated expiration legal-status Critical
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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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes

Definitions

  • the present invention relates to the paper industry and in particular the recycled paper industry and more specifically it relates to a new process for treating paper pulp using an enzymatic solution.
  • the paper industry is using more and more recycled paper. For example, to manufacture corrugated cardboard, more and more raw materials based on recycled fibers are used, and the number of recycles is increased in parallel. With each recycling, the quality of the raw materials is further degraded. To find a satisfactory level of mechanical characteristics, a refining of the doughs in aqueous suspension is generally carried out, which causes machinability difficulties.
  • the pulp in aqueous suspension ready to be used on a paper machine can be characterized by various parameters, one of which is particularly significant for predicting the suitability of the pulp for draining.
  • the Schopper-Riegler degree (SR) of a pulp is thus defined as being an element of appreciation of the quality of a pulp for papermaking. It expresses the ability of water to separate from the suspension under the conditions defined by standard NFQ 50 003. On a scale ranging from 0 to 100, a high value of SR indicates a low speed of drainage of the suspension while a low value indicates a faster drip speed. It has been observed, for example, that a dough which has undergone a refining operation has its SR more or less increased according to the degree of refining undergone, compared to a dough which has undergone little or no such operation.
  • the invention aims to provide a process for treating pulp in aqueous suspension, such as suspensions based on recycled fibers, having an SR at least equal to 25 which, by the intervention of enzymes, makes it possible to lower the SR and therefore improve the drainage of the suspension and the yield of the paper forming process.
  • This process therefore aims not to improve the drainage of the treated dough, but to improve its ability to refine.
  • the method according to the invention applies not to unrefined pulp pulps, but to pulps which already have a high SR.
  • the high value of SR can result either from a prior mechanical refining which has made the pulp suitable for supplying a paper having good mechanical characteristics, owing to the fact that the pulp has already undergone several recycling operations, or possibly from the combination of the two operations.
  • Document US-A-3 406 089 in particular envisages the treatment of a paper composition using a selective cellulase which operates a fragmentation of the cellulose fibers in order to digest and solubilize the fines, in particular with a view to cleaning canvas or which digests fines in order to modify the properties of paper pulp.
  • an aqueous suspension of a paper pulp intended to be used on a paper machine to form a sheet is made to act, said aqueous suspension having a degree SR at least equal to 25, measured on a paste in homogeneous suspension at 2 g / l under the conditions of standard NF Q 50 003, an enzymatic preparation containing cellulases and / or hemicellulases under conditions of concentration and of appropriate enzymatic activities in order to lower the SR degree and improve the drainage of the aqueous suspension without undesirable effect on the mechanical characteristics of the papers produced from this pulp, these conditions being a concentration of 0.01% at 2% by weight relative to the total weight of the dry pulp in the case where it is an enzymatic powder preparation having a C1 activity (AVICEL) of 0.168 USI / mg of powder, a C x activity (CMC) 3.91 USI / mg powder and a xylanasic activity of 31 USI / mg powder.
  • AAVICEL C1 activity
  • the treated paper pulps can be used for the most varied applications in the paper industry. These are pulps made from recycled fibers or unbleached or bleached chemical pulps for obtaining kraft paper. Mention may also be made of mechanical pulps, as they are used for the production of newsprint.
  • the activity C x is assayed on modified cellulose, carboxymethylcellulose and it is quantified by a drop in viscosity carboxymethylcellulose or an increase in reducing activities.
  • the xylanasic activity allows hydrolysis of the binding xylans.
  • the treatment with the enzymatic preparation is not continued beyond approximately 60 minutes, because the SR tends to rise slightly beyond this duration, while remaining significantly lower than the starting SR.
  • the enzyme preparation is used at an enzyme concentration which varies according to the C1, C x or xylanasic activities of the enzymes contained in the preparation.
  • the enzymatic preparation is preferably at a concentration of 0.01% to 2% of the weight of the dry dough, these percentages corresponding to a preparation having a C1 activity of 0.168 USI per milligram of powder, an activity C x of 3.9 USI per milligram of powder and a xylanasic activity of 31 USI per milligram of powder.
  • concentrations of enzymatic preparations must be adapted according to the type of preparation used. The fact remains that generally, below a concentration equal to about 0.01% of the weight of the dry dough, no significant effect is observed, except to extend the reaction time. Beyond a concentration equal to about 2% of the weight of the dry pulp, the cost of the operation tends to become prohibitive, and the mechanical characteristics of the paper produced tend to decrease.
  • the reaction medium can be more or less suitable for the action of enzymes. Temperature and pH conditions are more particularly suitable for avoiding any risk of denaturation of the enzymes by the medium.
  • the pH is thus advantageously between 3 and 7, and the temperature between 20 ° C and 60 ° C. Above 60 ° C, the medium tends to denature the enzyme, and below 20 ° C, the action of the enzymes manifests itself particularly slowly.
  • a good example of application of the method according to the invention is represented by the suspended pulps based on recycled fibers.
  • the treatment according to the invention makes it possible to significantly improve the yield on the paper machine.
  • the enzymatic treatment is preceded in this application by a conventional mechanical refining. It has been found that the mechanical properties of the paper produced are also improved under these conditions, and in particular the burst index or the CMT.
  • a starch coating is advantageously carried out after the sheets have been formed and dried on the paper machine. Under these conditions, not only does one obtain a lowering of the SR, thanks to the enzymatic treatment but also an increase of the mechanical characteristics such as the burst index or the CMT, thanks to the coating of starch.
  • the pulp in suspension is implemented on a usual paper machine which comprises a manufacturing table provided with a box providing a jet of pulp in aqueous suspension for the formation of a sheet of paper with a layer , the manufacturing table being covered with a fabric for draining the dough, a press section, a drying section and possibly a size press for coating starch.
  • An aqueous suspension of paper pulp made from recycled fibers is prepared in the following way: 5 kg dry weight of a pulp consisting of 40% of fibers from recycled cardboard boxes (CCR) and 60% of fibers from is weighed from the warehouse and put it in a reactor. It is made into an aqueous suspension at 3.5% in weight by adding water up to a total weight of 143 kg. The pH of the suspension is adjusted to 4.8 by adding 900 cc of 1N H2SO4. The reactor is stirred at a speed of 50 revolutions / minute to homogenize the suspension.
  • CCR recycled cardboard boxes
  • the reactor is preheated for 90 minutes until reaching 50 ° C., then 0.1% by weight is introduced relative to the weight of dry paste of enzymes prepared in the following manner: 5 g of a Maxazyme powder are taken CL 2000, marketed by the company RAPIDASE.
  • the product sold under this designation is characterized by the fact that it comes from the culture of the microorganism Trichoderma viridae , that it has a C1 activity of 0.168 USI, a C x activity of 3.91 USI, a xylanasic activity of 31 USI and an FPU (Filter paper unit) of 0.28.
  • This powder is placed in 2800 g of water brought to a pH of 4.8 and the aqueous enzyme solution thus prepared is introduced into the reactor.
  • the maxazyme is allowed to react for 30 minutes.
  • the reaction is stopped by diluting the contents of the reactor until a suspension of 7 g per liter is obtained.
  • the SR is measured in the context of the example just before the introduction of the enzymes and 30 minutes after the introduction of the enzymes. Its value goes from 54 to 44.
  • a control suspension which is not treated with the enzymatic solution is simultaneously prepared, under identical conditions, and the suspensions are sent to a pilot paper machine to form a single-layer sheet with a basis weight of 120 g / m2.
  • Example 1 The conditions of Example 1 are repeated, except that before the introduction of the enzymes, the suspension paste is mechanically refined using a SPROUT-WALDRON refiner until an SR of 74 is obtained. 30 minutes after the introduction of enzymes, the SR is lowered to 59.
  • Example 1 The conditions of Example 1 are repeated, except that after having formed the sheet of paper, it is coated with starch, at a rate of 5 g / m2, using a size press.
  • control was coated with starch but not treated with enzymes.
  • Example 3 There is a conservation of mechanical characteristics at a high level. In comparison with the control of Example 1, the treatment carried out under the conditions of Example 3 therefore not only made it possible to lower the SR, but also to increase the mechanical characteristics.
  • example 2 The conditions of example 2 are repeated, subjecting the paper to the starch treatment described in example 3.
  • the witness was coated with starch, but neither treated with enzymes, nor mechanically refined.
  • Example 1 The conditions of Example 1 are repeated, except that the maxazyme CL 2000 is replaced by the 250 P cellulase marketed by the company GENENCOR.
  • This liquid enzyme preparation is characterized by the following activities: C1 (AVICEL) 0.008 USI / mg powder C x (CMC) 0.12 ICU / mg powder xylanasic 0.11 ICU / mg powder FPU 0.26 ICU / mg powder
  • the starting pulp is also modified. This time, it is made up of 75% CCR and 25% warehouse fat and makes an aqueous suspension of 3%.
  • the SR goes from 39.5 to 29.5.
  • Example 5 The conditions of Example 5 are repeated, replacing the 250 P cellulase by the enzyme preparation SP 249 derived from the microorganism Aspergillus niger and sold by the company NOVO.
  • This enzymatic preparation, liquid is characterized by the following activities: C1 (AVICEL) 8 ICU / ml solution C x (CMC) 108 ICU / mg solution xylanasic 560 ICU / mg solution FPU 1 ICU / mg solution
  • This preparation is introduced at a concentration of 2.65% of the weight of the dough dry.
  • the SR goes from 34.5 to 27.
  • Example 1 Under the same conditions as in Example 1, a 5% aqueous suspension of a paper pulp composed of 100% bulk from a warehouse is prepared. 0.25% by weight of dry paste is introduced this time of the enzymatic preparation of Example 1.
  • the SR goes from 48 to 35.5.
  • a kraft chemical pulp of bleached short fibers is prepared and a 5% suspension is made.
  • the procedure is that described in Example 1, except that the enzymatic preparation is introduced at a concentration of 0.25% by weight of dry paste and the enzymes are made to act for 60 minutes.
  • the dough is refined mechanically, so as to increase the SR from 18 to 25. After the enzymatic treatment, it is found that the SR has been lowered to 20.
  • the burst index will always be retained, but also the length of rupture by traction.
  • the tensile strength is determined according to the conditions defined in standard NFQ 03 004. This is the calculated length limit, beyond which a strip of paper of any width, but uniform, assumed to be suspended by one of its ends, breaks under the effect of its own weight.
  • Example 8 The same conditions are repeated as in Example 8, except that the dough is mechanically refined before obtaining an SR of 31. After the enzymatic treatment, the SR is lowered to 22.
  • Example 8 when starting from a higher initial SR, corresponding to a more refined pulp, the implementation of which leads to the production of paper s having better mechanical characteristics, Thanks to the invention, it is easier to lower the SR, without deteriorating the mechanical characteristics. Thus, not only do we have satisfactory mechanical characteristics, but also a good yield on the paper machine.
  • the SR is lowered from 25 to 20 after the enzyme treatment, a drop of 20%.
  • the SR is lowered from 31 to 22 after an identical enzymatic treatment, ie a fall of 29%.
  • the initial SR is 12, the dough undergoes mechanical refining prior to the enzymatic treatment which brings the SR to 25. After the enzymatic treatment, it is lowered to 21.
EP87402097A 1986-09-22 1987-09-21 Procédé de traitement d'une pâte papetière par une solution enzymatique Expired - Lifetime EP0262040B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402097T ATE82339T1 (de) 1986-09-22 1987-09-21 Verfahren zur behandlung einer papierpulpe mit einer enzymatischen loesung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613208A FR2604198B1 (fr) 1986-09-22 1986-09-22 Procede de traitement d'une pate papetiere par une solution enzymatique.
FR8613208 1986-09-22

Publications (2)

Publication Number Publication Date
EP0262040A1 EP0262040A1 (fr) 1988-03-30
EP0262040B1 true EP0262040B1 (fr) 1992-11-11

Family

ID=9339156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402097A Expired - Lifetime EP0262040B1 (fr) 1986-09-22 1987-09-21 Procédé de traitement d'une pâte papetière par une solution enzymatique

Country Status (12)

Country Link
US (2) US4923565A (no)
EP (1) EP0262040B1 (no)
JP (1) JPH07107234B2 (no)
AT (1) ATE82339T1 (no)
CA (1) CA1340724C (no)
DE (1) DE3782602T2 (no)
ES (1) ES2043679T3 (no)
FI (1) FI87242C (no)
FR (1) FR2604198B1 (no)
GR (1) GR3007008T3 (no)
NO (1) NO172858C (no)
SU (1) SU1701117A3 (no)

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Also Published As

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NO172858B (no) 1993-06-07
NO172858C (no) 1993-09-15
NO873565L (no) 1988-03-23
ES2043679T3 (es) 1994-01-01
GR3007008T3 (no) 1993-07-30
NO873565D0 (no) 1987-08-24
EP0262040A1 (fr) 1988-03-30
CA1340724C (fr) 1999-09-07
FR2604198A1 (fr) 1988-03-25
SU1701117A3 (ru) 1991-12-23
JPH07107234B2 (ja) 1995-11-15
FI874113A0 (fi) 1987-09-21
FI87242C (fi) 1992-12-10
ATE82339T1 (de) 1992-11-15
FI874113A (fi) 1988-03-23
JPS63145495A (ja) 1988-06-17
US4923565A (en) 1990-05-08
FR2604198B1 (fr) 1989-07-07
FI87242B (fi) 1992-08-31
DE3782602D1 (de) 1992-12-17
DE3782602T2 (de) 1993-06-03
US5308449A (en) 1994-05-03

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