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Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate

a technology of calcium carbonate and precipitation system, which is applied in the field of method and system for precipitation of calcium carbonate and a product comprising calcium carbonate, can solve the problems of significant problems in the paper machine, deterioration of paper strength properties, etc., and achieve cost-effectiveness, improve the light scattering properties of the product, and boost the chemical reaction

Inactive Publication Date: 2015-06-18
UPM-KYMMENE OYJ
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a method for producing a wet strength enhancing agent for paper and paperboard. The method involves using precipitating calcium carbonate to enhance the strength of the product. The resulting paper or paperboard has improved wet tension properties and reduced dusting, which makes it easier to add more filler content. The method also improves the light scattering properties of the product, which is important for the use of birch pulp. The method can be easily integrated into existing paper and paperboard mills without significant investments and can even be implemented without any new equipment. The fiber mixture used in the method may contain hardwood or softwood, with hardwood typically making up no more than 40% of the fibers. The degree of refining of the fiber suspension may vary depending on the desired level of strength.

Problems solved by technology

Increasing filler content according to prior art, however, typically causes deterioration in the strength properties of paper.
Especially decreasing the wet strength of paper may cause significant problems in a paper machine.

Method used

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  • Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate
  • Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate
  • Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate

Examples

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example 1

[0051]The test runs were carried out in a continuous tube reactor. FIG. 2 shows the method being used in a schematic vied. The pulp, which was normally refined birch pulp, remained in the tank in an aqueous suspension of calcium hydroxide for about 100 minutes. Carbon dioxide was introduced after this to the mixture by using TrumpJet® equipment. The temperature of the process was about 50° C. and the pressure in the reactor was about 4.1 bar. The flow rate of the main process flow in the tube reactor was about 2 l / s. In FIGS. 1-2“INJ” refers to the introduction of a component, which in the test runs took place by injection.

[0052]In addition to pulp suspensions and products produced by the method according to the invention, reference samples were produced, which were produced with otherwise the same parameters, but in the method carbon dioxide was first injected to the water flow and after this, milk of lime. FIG. 1 shows the method used in the reference samples in a schematic view.

[...

example 2

[0056]A test run was performed with a total of ten test points, four test points 1-4 of which were reference points, where the fibers did not have a delay with milk of lime, or the delay was short. In addition, there were six actual test run test points according to the method according to the invention, i.e. test points 5-10, where the method according to FIG. 2 was used.

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Abstract

A method for precipitating calcium carbonate, in which method calcium hydroxide is introduced to a fiber suspension containing cellulose-containing fibers, the calcium hydroxide is allowed to attach onto the surfaces of fibers for a pre-determined time, and the aqueous suspension of calcium hydroxide and fibers is brought into contact with carbon dioxide for precipitating the calcium carbonate. A corresponding system for precipitating calcium carbonate in connection with cellulose-containing fibers and a fibrous product, which comprises pulp material produced by the method and comprising calcium carbonate, are also set forth.

Description

[0001]This application is a divisional application of application Ser. No. 13 / 814,413 filed Feb. 5, 2013, which in turn is a U.S. national stage application of PCT / FI2011 / 050716 filed Aug. 16, 2011. Each of these prior applications is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The invention relates to a method and a system for precipitating calcium carbonate. In addition, the invention relates to a product comprising calcium carbonate.BACKGROUND OF THE INVENTION[0003]PCC is precipitated calcium carbonate. In industry it is typically produced by allowing calcium hydroxide Ca(OH)2 to react with a precipitating agent, such as, for example, carbon dioxide CO2, wherein the resulting product is precipitated calcium carbonate (PCC). The calcium hydroxide Ca(OH)2 used in the reaction may be produced, for example, by slaking burnt lime CaO with water, wherein the reaction produces calcium hydroxide.[0004]Typically calcium carbonate CaCO3 is precipitated in i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/67D21C9/00
CPCD21C9/004D21H17/675C01F11/18C01F11/182C01P2004/03C01F11/181D21H17/70D21H23/06C01P2004/61
Inventor SOLISMAA, PAIVI
Owner UPM-KYMMENE OYJ
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