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Paper containing scalenohedral precipitated calcium carbonate (s-pcc)

Inactive Publication Date: 2019-03-28
HF BIOTEC BERLIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for improving the properties of paper by adding a specific type of carbon dioxide (s-PCC) during the paper making process. The s-PCC helps to reduce the size of the paper fibers, making the paper stronger and more opaque. The method also involves adding a specific amount of lime milk during the reaction, which further enhances the properties of the paper. By adjusting these factors, the method can produce paper with improved properties, such as strength and opacity. Additionally, the method can be used with a variety of paper types, such as tissue paper and newsprint.

Problems solved by technology

While many advantages may be gained from the ability to control the paper's properties with the aid of the PCC (greater brightness, impermeability to light and thickness than with ground calcium carbonate GCC), until now the possible use of conventional PCC as filler material has been limited because it renders the fibres less stable.
The person skilled in the art in this industry will typically familiar with the limit conditions of the PCC system—some of which are highly complex—that may influence the modification, from many successful and unsuccessful experiments.
However, until now there has been no systematic approach to the production of PCC with a defined grain size and a defined (narrow) grain size distribution.
Therefore, until now it has not been possible to attain this objective consistently.
The process itself is technically very complicated.
The properties cannot be obtained with previously known PCC methods.

Method used

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  • Paper containing scalenohedral precipitated calcium carbonate (s-pcc)
  • Paper containing scalenohedral precipitated calcium carbonate (s-pcc)
  • Paper containing scalenohedral precipitated calcium carbonate (s-pcc)

Examples

Experimental program
Comparison scheme
Effect test

example 1

n of s-PCC in the Pilot Reactor

[0080]The following dataset was applied:

Lime milk 11.3 weight percent

Reactor fill level: 9 l

Speed of gassing turbine: 35 Hz

vvm: 0.5 (0.27 Nm3 / h)

[0081]CO2 concentration: 30%

Reaction time T 90: 281 min

Gas utilisation rate: 81%

CO2 input in time T 90: 12.8 moles

Total energy input in the period T 90: 536 Wh s

Specific energy input per mole CO2: 42 Wh per mol CO2

s-PCC was produced with a D4.3 of 2.38 μm.

[0082]It is evident that there is a direct relationship between the molar energy input per mol input CO2 and the resulting characteristic grain size D4.3. The larger the amount of input energy applied to a mole of CO2, the smaller the crystals become, and vice versa. Surprisingly, it is therefore also possible to produce smaller particles with lower concentrations of CO2 by combining corresponding parameters—for example those of gassing, the fill level and the rotating speed of the gassing devices—provided that corresponding parameters are combined in such ma...

example 2

n of s-PCC

[0084]The following dataset was applied:

Lime milk 11.3 weight percent

Reactor fill level: at the start of carboxylation: 220 l, after 20 min 280 l, after 40 min 240 l until the end of the reaction

Speed of gassing turbine: at the start of carboxylation: 38 Hz, after 20 min 40 Hz, after 40 min 45 Hz until the end of the reaction

Temperature: 45° C., constant (heat dissipation via internal cooler)

CO2 concentration: 45% (biogas), constant

vvm: 1.5 per min, constant

Specific energy input per mole CO2 immediately at the beginning of the reaction: 7 Wh per mol CO2

s-PCC was produced with a characteristic D4.3 of 3.0 μm and a value for

D4.3D90times100

greater than 62.

example 3

n of s-PCC

[0085]The following dataset was applied:

Lime milk 11.3 weight percent

Reactor fill level: at the start of carboxylation: 220 l, after 20 min 280 l, after 40 min 240 l until the end of the reaction

Speed of gassing turbine: at the start of carboxylation: 38 Hz, after 20 min 40 Hz, after 40 min 45 Hz until the end of the reaction

Temperature: at the start of carboxylation 45° C., after 20 min 43° C., after 40 min 41° C. until the end of the reaction (heat dissipation via internal cooler)

CO2 concentration: at the start of carboxylation 35%, after 40 min 45%

vvm: 1.5 per min, constant

Specific energy input per mole CO2 immediately at the beginning of the reaction: 8 Wh per mol CO2

s-PCC was produced with a characteristic D4.3 of 2.9 μm and a value for

D4.3D90times100

greater than 61.

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Abstract

The invention relates to paper that contains scalenohedral precipitated calcium carbonate (s-PCC) of a certain specification. The invention further relates to the user of a s-PCC having a certain specification as filler material for paper.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of PCT / EP2017 / 063168 file May 31, 2017, which claims priority to EP 16172231.9 filed May 31, 2016, both of which are incorporated by reference.FIELD OF THE INVENTION[0002]The invention relates to paper which contains scalenohedral precipitated calcium carbonate (s-PCC) having a certain specification. The invention relates further to the user of a s-PCC having a certain specification as filler material for paper.TECHNICAL BACKGROUND[0003]Paper is a two-dimensional material which consists substantially of fibres of plant origin and is formed by removing the moisture from a fibre suspension on a sieve-like screen. The fibre fleece formed thereby is compressed and dried.[0004]One of the main components of paper are cellulose fibres, which have a length in the range from a few millimetres to a few centimetres. The cellulose is first largely exposed, that is to say separated from the hemicelluloses, resins and...

Claims

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Application Information

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IPC IPC(8): D21H17/67D21H21/52
CPCD21H17/675D21H21/52D21H19/385
Inventor FOLLMANN, HEINRICHBOSCHERT, MICHAELBAUCH, RENEHOFMANN, ANJA
Owner HF BIOTEC BERLIN