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 a novel method for
• waste water in particular paper mill or pulp waste water.
• Pulp production Use of lignolytic enzymes: biopuiping.
• Processes include the sulfate and sulfite processes. With both processes, boiling and under pressure, cellulose ej-zeug: The sulfate process works with the active chemicals NaOH and Na 2 S. The sulfite process with Ca (HSO 3 ) 2 - SO 2 .
• the wood fabrication processes work with stone grinding (wood grinding) or with refiners (TMP). which the wood after
• wood pulps still contain a large part of the lignin and are mainly for printing newsprint or printing
• Biopulping is generally understood to mean using biological
• Cellulose or hemicellulose are dependent as a carbon source. This
• the main difficulty is the very slow one
• the rate of degradation of the lignin (days to weeks), so that in the in vivo process: wood chips + cellulase-less - mutants (Phanerochaete chrysosporium), among other things, at the screening of new ones better wild tribes works.
• the ultimate goal is to achieve faster and more effective lignin breakdown, especially the one above
• Phanerochaete chrysosporium Phanerochaete chrysosporium.
• Pulps used in the mechanical-thermal or chemo-mechanical or chemo-thermo-mechanical treatment of wood pulp Pulps used in the mechanical-thermal or chemo-mechanical or chemo-thermo-mechanical treatment of wood pulp
• the bleach is
• heme compounds e.g. also hemoglobin, which is quasi the active heme component in the
• the hemicellulases here u.a. the xylanases. are used as bleaching enzymes because one suspects an effect on the bonds between hemicelluloses (xyians) and the lignin.
• the enzyme has a long duration of action at relative
• lignolytic enzymes decolorization and detoxification of cellulose fabrication waste water and the oxidation and thus detoxification of chlorinated aromatics and others
• the present invention has now set itself the task.
• Oxidize lignin Oxidize lignin.
• German patent applications DE 3636208 (WO 88/03190).
• P 408894.4 describe the use of lignolytic enzymes with simultaneous addition of reduction and
• Laccase v.a. used by Coriolus versicoior This laccase is used together with laccase substrates
• Fig. 1 shows the mechanism of action of laccases on the
• the laccase catalyses the formation of a mesomeric aryloxy radical from phenol.
• Residual lignin content i.e. around 19% attempts to break down with the new one
• Residual lignin content i.e. by 41%, i.e. by more than double.
• the inventive method determined by means of a red-ox electrode and by means of a controller and actuator during the
• Reducing agents, salts and phenolic compounds are kept constant.
• Air, O 2 or hydrogen peroxide are preferably used as the oxidizing agent.
• Sodium bisulfite comes as a reducing agent.
• Metal salts are preferably used as salts. This is where FeSO 4 comes in. FeCl 3 . MnSO 4 . TiO 2 , CuSO 4 and Mn 3 acetate into consideration. It should also be noted that the addition of
• ethylenediamine tetraacetic acid EDTA
• EDTA ethylenediamine tetraacetic acid
• DTPA Diethylenetriamine-penta-acetic acid
• cathionic and ampholytic surfactants as well as glucans and
• Enzymes can also use hemicellulases and / or pectinases and / or lipases. The main difference to that in the work "Oxidation of non
• the system according to the Invention is either by means of laccase alone
• lignin peroxidases and / or manganese peroxidases from e.g.
• Phanerochaete chrysosporium or other white rot fungi used together. With the latter. Lignin peroxidase (manganese peroxidases) + laccase. is worked at a pH around 4-5, at which both enzyme species are still active. The actual lignin breakdown. the bleach (with
• Oxidizing agents i.e. by intercepting lignin degradation
• Yeast cell walls originate in mixed cultures between
• an additional bleaching system such as formamidine sulfinic acid (FAS) / NaOH can also be important to compensate for the bleaching effect of NaOH / HO in the chemical system, and also as a collector the addition of soaps alone or in
• Oxidizing agents H 2 O 2. O 2 or atmospheric oxygen allow an almost complete polymerization of lignins contained in the wastewater, which go far (20-50%) above the values that can be achieved with laccases alone. This makes it possible for 70-90% of the lignin to become insoluble and thus loosen up, sediment,
• the pH is adjusted to 5 with 1N HCl.
• 0.1 - 1.5% H 2 O 2 are related to dry matter, approx. 0.1% ETDA or DTPA.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Biochemistry (AREA)
• Microbiology (AREA)
• Paper (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25903703

Family Applications (1)

Country Status (10)

Families Citing this family (27)

Family Cites Families (4)

• 1991
  • 1991-11-16 DE DE19914137761 patent/DE4137761A1/de not_active Withdrawn
• 1992
  • 1992-05-16 CN CN 92104549 patent/CN1068161A/zh active Pending
  • 1992-05-18 CA CA 2103260 patent/CA2103260A1/en not_active Abandoned
  • 1992-05-18 AU AU17933/92A patent/AU663501B2/en not_active Ceased
  • 1992-05-18 JP JP4510402A patent/JPH06508663A/ja active Pending
  • 1992-05-18 WO PCT/EP1992/001086 patent/WO1992020857A1/de not_active Application Discontinuation
  • 1992-05-18 EP EP19920910456 patent/EP0584176A1/de not_active Withdrawn
  • 1992-05-18 BR BR9206013A patent/BR9206013A/pt not_active Application Discontinuation
• 1993
  • 1993-11-16 FI FI935067A patent/FI935067A/fi not_active Application Discontinuation
  • 1993-11-16 NO NO934148A patent/NO934148L/no unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events