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Process for the manufacturing of cellulose pulp

Inactive Publication Date: 2005-11-17
KVAERNER PULPING
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  • Abstract
  • Description
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  • Application Information

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Benefits of technology

[0001] The present invention concerns a method and a system for the production of cellulose pulp in which wood raw material that principally consists of softwood, preferably in the form of cut wood chips, is treated in several stages in various treatment steps, whereby one of the steps comprises the cooking of the material in an alkali cooking fluid, with the goal of obtaining improved quality with respect to tensile strength and increased yield.

Problems solved by technology

However, a problem associated with this method is that polysulphide is subject to thermal decomposition, which leads to a major part being broken down by the high cooking temperature before the effect of increasing the yield of pulp is obtained.
Known methods demonstrate either disadvantages related to cost and / or do not provide sufficient quality with respect to beatability or tensile strength.

Method used

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  • Process for the manufacturing of cellulose pulp
  • Process for the manufacturing of cellulose pulp
  • Process for the manufacturing of cellulose pulp

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Experimental program
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Embodiment Construction

[0018] Comparative tests have been carried out with the aim of evaluating the invention. The same cooking conditions have been used in the comparative tests and the same original material with respect to softwood has been used. A conventional method was used in one cooking experiment, whereby the wood raw material was 100% constituted by softwood. Softwood was used for 97% of the raw material in the method according to the invention, while 3% was constituted by pin chips of birch.

TABLE 1Comparison between conventional cooking and the inventionPulp:SW ConiferSW + 3% pin chipsof birchCooking run number:CK 2434CK 2439Kappa2324Viscosity, dm3 / kg:11461170Weighted mean fibre length, mm2.382.34Zero Span, Nm / g:145144Yield, %:45.746.3 (47.8)Interpolated properties at tensile strength 80 kNm / kg:Revolutions, PFI350100Slowness, ° SR:15.015.0Density, kg / m3:655655Air resistance, sec. / 100 ml:5.25.6Burst index, MN / kg:5.75.4Tear index, Nm2 / kg:17.116.0Tensile stiffness index, MNm / kg:6.56.3

[0019] As ...

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Abstract

The invention concerns a method for the production of cellulose pulp. A wood raw material that principally comprises softwood, preferably in the form of cut wood chips, is treated in several stages in various treatment steps. One of the stages is cooking the material in an alkali cooking fluid, with the aim of obtaining improved quality with respect to tensile strength, and of obtaining higher yield. A controlled addition of wood raw material in the form of hardwood at an amount corresponding to 1-20% of the amount of softwood, preferably 3-15%, and more preferably at least 5%, takes place.

Description

[0001] The present invention concerns a method and a system for the production of cellulose pulp in which wood raw material that principally consists of softwood, preferably in the form of cut wood chips, is treated in several stages in various treatment steps, whereby one of the steps comprises the cooking of the material in an alkali cooking fluid, with the goal of obtaining improved quality with respect to tensile strength and increased yield. THE PRIOR ART [0002] The yield calculated with respect to wood raw material is very significant when cooking, and it normally lies around 45% for softwood and approximately 50% for hardwood. An increase of a single percentage point results in a production plant of normal size, 1,500 tonnes of pulp per day (approximately 3,000 tonnes of wood raw material per day), giving an increased production of 30 tonnes. With a pulp price of approximately USD 700 per ADT, this gives an increase in revenue of at least USD 21,000 per day. An increase in ma...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C3/22D21C5/00
CPCD21C3/02D21C5/00D21C3/228D21C3/22
Inventor LINDSTROM, MIKAELSNEKKENES, VIDAROLSSON, KRISTER
Owner KVAERNER PULPING
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