A method for controlling the deposition of stickies in pulping and papermaking processes
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A sticky matter, pulping technology, applied in textiles and papermaking, preventing corrosion/sediment formation of pulping equipment, pulping with organic compounds, etc., can solve problems such as limited types
Active Publication Date: 2017-08-01
NOPCO PAPER TECH
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These changes may also limit the types of techniques available to overcome problems caused by stickies deposition
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Embodiment 1
[0056] Example 1 - "Mill A"
[0057] Mill A is an integrated paper machine for the production of printing grade paper using recycled grade paper as furnish.
[0058] Deinked pulp (DIP) for newsprint is produced using a common dual loop RCF (Regenerated Fiber) unit.
[0059] Raw materials consisted of standard household quality ONP and OMG (old newsprint and magazine grade, respectively). The treatment temperature is 40-50°C, the water hardness is 10-30odH, and the pH is 7-9.
[0060] In the DIP unit, use NaOH (caustic soda), water glass (silicate) and H 2 o 2(peroxide) for ink detachment and to prevent ink redeposition and yellowing. In addition, sodium soap is added in the pre-flotation circuit and post-flotation circuit for ink removal. Due to the hardness of the water, the soap is at least partially converted to calcium soap. Soap was incorporated in an amount of 2-3 kg / ton (calculated as fatty acid per ton dry discharge from pulper / drum).
[0061] The amount of hy...
Embodiment 2
[0069] Example 2 - "Mill B"
[0070] Mill B is a dual loop RCF unit to produce DIP for newsprint production. The composition of ingredients included standard household quality ONP and OMG.
[0071] Again the same chemical mixture containing caustic, silicate and peroxide is used for ink stripping and to prevent ink redeposition and yellowing.
[0072] Again, in addition to this chemical mixture, sodium soaps that convert to calcium soaps due to water hardness are added for ink removal in the pre and post flotation circuits.
[0073] The treatment temperature is 45-50°C, the water hardness is 10-30odH, and the pH value is 7-9.
[0074] To assess the presence of sticky-forming deposits on surfaces in processing systems by studying the amount of hydrophobic micro-stickies present in RCF units and at various locations in the wet end of a paper machine by flow cytometry possibility.
[0075] During the reference period, 1.5 kg sodium soap / ton (as fatty acid) was added to the ...
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Abstract
A method for controlling the deposition of stickies in pulping and papermaking processes. The method comprises adding to fibre pulp or stock an additive comprising an organo-modified siloxane comprising units of the formula: [R<1>ZSiO<(4-a-b) / 2>]n in which each R<1> is independently selected from a hydrogen atom, an alkyl, aryl, alkenyl, aralkyl, alkaryl, alkoxy, alkanoyloxy, hydroxyl, ester or ether group, and each Z is independently selected from an alkyl group substituted with an amine, amide, carboxyl, ester, or epoxy group, or preferably at least one or more groups -R<2>-(OCpH<2p>)<q>(OC<r>H<2r>)<s>-R<3>, wherein the n is an integer greater than 1; the a and the b are independently 0, 1, 2 or 3; the R<2> is an alkylene group or a direct bond; the R<3> is a group as defined for the R<1> or the Z above; the p and the r are independently an integer from 1 to 6; the q and the s are independently 0 or an integer such that 1 <= q + s <= 400. Each molecule of the organo-modified siloxane contains at least one group Z. The organo-modified siloxane is preferably a hydroxyl- or alkyl- endcapped linear polydimethylsiloxane, in which 5 to 18 mole percents of silicon atoms are substituted by the Z groups of the formula -R<2>-(OCH<2p>)<q>(OC<r>H<2r>)<s>-R<3>, wherein the p is 2, the r is 3, the q and the s are independently 10 to 20, the R<2> is an alkylene group having from 1 to 6 carbon atoms or a direct bond, and the R<3> is a hydrogen atom or a hydroxyl, alkoxy, ester or ether group.
Description
technical field [0001] The present invention relates to a method for controlling sticky deposition in pulp and papermaking processes. Background technique [0002] The problems associated with the formation of sticky deposits (comprising both inorganic and organic components) in pulp and papermaking processes are well known. "Pitch", "stickies" and "white-pitch" are terms commonly used for the sticky hydrophobic material produced in these processes that mechanically adheres to surfaces and forms aggregates body. [0003] In pulping processes using virgin fibers, "bitumen" generally refers to a natural resinous hydrophobic material comprising fatty acids, esters and sterols derived from natural raw materials, most often wood. Bitumen is particularly prevalent in the mechanical grade pulps commonly used for recycled paper, where it undergoes hydrolytic degradation and saponification to a lesser extent than the alkaline kraft process used to make chemical pulps. [0004] Pap...
Claims
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Application Information
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