Use of cyclodextrins for reducing deposits during paper production
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example 1
Removal of Fatty Acids from Solution by α-Cyclodextrin
[0068] Removal of fatty acids from solutions by addition of α-cyclodextrin was tested by preparing a 0.1% linoleic acid suspension and a 1.0% α-cyclodextrin solution as follows:
1. 250 μl linoleic acid was transferred to a 250 ml volumetric flask.
2. Deionized water was slowly added while agitating on a whirly mixer.
3. Linoleic acid solution stays suspended as long as agitation is continued.
[0069] A 1.0% α-cyclodextrin solution was prepared by dissolving 2 g of α-cyclodextrin in 200 ml deionized water.
[0070] The 0.1% linoleic acid suspensio was mixed with the 1.0% cyclodextrin solution at different ratios of fatty acid to cyclodextrin and the increase in turbidity was determined. The results are given in the Table 1 below.
TABLE 1Turbidity (NTU, Nephelometric Turbidity Units) measurements of mixturesof fatty acid (FA) and cyclodextrin (CD).FattyacidVolumeCyclodextrin,VolumeWaterRatioTurbidityTest tube0.1%(ml)1.0%(ml)(ml)F...
example 2
Use of Cyclodextrin for Wash Deinking of ONP
[0072] Deinking of old newspaper (ONP) by adding cyclodextrin during pulp formation and subsequent washing was tested using the following protocol:
[0073] Add 50 g of shredded old newspaper, 1500 ml of water and 4 kg / ton of Tomah wash deinking surfactant to a pulper. Set the temperature at 45° C. Add cyclodextrin (2 kg / t) and mix for 10 minutes. Transfer slurry into a bucket with 1.5 l of water at the same temperature as the slurry and stir the slurry for 30 min. Make No Wash (NW), Wash (W), and Hyper Wash (HW) pads after 5 minutes and 30 minutes of stirring.
[0074] For a No Wash pad (NW), weigh out 180 g of slurry, fill up to 300 ml with water, stir, and pour into filter with a Whatman 40 ashless filter paper. For Wash pad (W), weigh out 180 g of slurry, and wash with 1 L of DI water in a Britt jar. Hyper Wash (HW) pads were made in the same manner as the wash pad (W) except using 5 L of DI water during washing.
[0075] The pads are evalu...
example 3
Use of Cyclodextrin for Deinking of ONP by Flotation
[0077] Deinking of old newspaper (ONP) by adding cyclodextrin during pulp formation and subsequent removal by flotation was tested using the following protocol:
[0078] Set pulper temperature to 50° C. Add 2 L water, 250 g ONP, 2 kg / ton of Huntsman flotation deinking surfactant and 2.5 kg / ton of cyclodextrin to the pulper. Mix for 10 min and transfer the slurry into a bucket with 3 L of water and stir it for 30 min at 50° C.
[0079] Add pulp slurry and 10 L water to a flotation cell (Delta 25 from Voith). Float for 5 min. By the end of the flotation make No Wash pads (NW) and determine brightness as mentioned above. The test results of the brightness evaluation are given in table 3 below.
TABLE 3BrightnessControlAlpha CDBeta CDNW Pads46.0747.0348.23Std Dev.0.060.250.12
[0080] It is evident that the addition of cyclodextrin to the flotation deinking process improved the pulp brightness. It appears that β-cyclodextrin is more effectiv...
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