Study of bleaching of old newsprint recycled paper: reproduction of newspaper material
With the utilization of used newspaper into the paper making industry, bleaching has been an area of concern to obtain a balance between desired brightness and the amount of treatment it requires. Motivation of this study was to optimize bleaching of recycled newsprint fibers in terms of five variab...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac1ca9 |
| _version_ | 1827869233813389312 |
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| author | Hassan Zeb Muhammad Asif Hussain Iftikhar Ahmed Muhammad Sarfraz Akram Bilal Haider Rizwan Haider Zaeem Bin Babar Rana Mujahid Saleem Abuzar Ahsan Iqra Aziz Muhammad Arif |
| author_facet | Hassan Zeb Muhammad Asif Hussain Iftikhar Ahmed Muhammad Sarfraz Akram Bilal Haider Rizwan Haider Zaeem Bin Babar Rana Mujahid Saleem Abuzar Ahsan Iqra Aziz Muhammad Arif |
| author_sort | Hassan Zeb |
| collection | DOAJ |
| description | With the utilization of used newspaper into the paper making industry, bleaching has been an area of concern to obtain a balance between desired brightness and the amount of treatment it requires. Motivation of this study was to optimize bleaching of recycled newsprint fibers in terms of five variables namely hydrogen peroxide charge, amount of sodium hydroxide employed, pulp consistency, bleaching temperature, and bleaching time. Experimental work was conducted in the laboratory to simulate bleaching plant and it was found that higher peroxide charge is better for improvement in brightness, but it is uneconomical to increase peroxide charge indefinitely. The amount of hydrogen peroxide is added so that the residual peroxide at the end of the reaction is not less than 10% of the initially added peroxide. Sodium hydroxide provides alkalinity which is very important for making the fibers flexible and softening of ink particles but it also contributes to pulp yellowing if residual hydrogen peroxide contents are lesser than the minimum required value. So, for 16 kg t ^−1 of hydrogen peroxide, 6 kg t ^−1 of sodium hydroxide prevented the brightness reversion in this study. Higher pulp consistency is better but unavailability of very high consistency pulp mixer in the industry is a limiting factor for higher than 30% pulp consistency. Temperature and time are quite interrelated and, with the given bleaching conditions, a temperature of 95 °C with 10 min residence time was found to be optimum for this study. It was also observed that multiple pre-washings increase brightness and save bleaching chemicals. |
| first_indexed | 2024-03-12T15:42:59Z |
| format | Article |
| id | doaj.art-412f0296b24e4bc9985643ec35b3929e |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:59Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-412f0296b24e4bc9985643ec35b3929e2023-08-09T15:53:44ZengIOP PublishingMaterials Research Express2053-15912021-01-018808530510.1088/2053-1591/ac1ca9Study of bleaching of old newsprint recycled paper: reproduction of newspaper materialHassan Zeb0https://orcid.org/0000-0002-8404-2253Muhammad Asif Hussain1Iftikhar Ahmed2https://orcid.org/0000-0003-3523-300XMuhammad Sarfraz Akram3Bilal Haider4Rizwan Haider5Zaeem Bin Babar6Rana Mujahid Saleem7Abuzar Ahsan8Iqra Aziz9Muhammad Arif10https://orcid.org/0000-0002-1566-1675Institute of Energy & Environmental Engineering, University of the Punjab , PakistanUniversity of Engineering and Technology Lahore , PakistanEnergy Research Centre, Comsats University Islamabad , Lahore Campus, PakistanInstitute of Energy & Environmental Engineering, University of the Punjab , PakistanInstitute of Chemical Engineering and Technology, University of the Punjab , PakistanInstitute of Energy & Environmental Engineering, University of the Punjab , PakistanInstitute of Energy & Environmental Engineering, University of the Punjab , PakistanInstitute of Chemical Engineering and Technology, University of the Punjab , PakistanInstitute of Energy & Environmental Engineering, University of the Punjab , PakistanInstitute of Energy & Environmental Engineering, University of the Punjab , PakistanCenter for Advanced Studies in Energy, University of Engineering and Technology , Peshawar, PakistanWith the utilization of used newspaper into the paper making industry, bleaching has been an area of concern to obtain a balance between desired brightness and the amount of treatment it requires. Motivation of this study was to optimize bleaching of recycled newsprint fibers in terms of five variables namely hydrogen peroxide charge, amount of sodium hydroxide employed, pulp consistency, bleaching temperature, and bleaching time. Experimental work was conducted in the laboratory to simulate bleaching plant and it was found that higher peroxide charge is better for improvement in brightness, but it is uneconomical to increase peroxide charge indefinitely. The amount of hydrogen peroxide is added so that the residual peroxide at the end of the reaction is not less than 10% of the initially added peroxide. Sodium hydroxide provides alkalinity which is very important for making the fibers flexible and softening of ink particles but it also contributes to pulp yellowing if residual hydrogen peroxide contents are lesser than the minimum required value. So, for 16 kg t ^−1 of hydrogen peroxide, 6 kg t ^−1 of sodium hydroxide prevented the brightness reversion in this study. Higher pulp consistency is better but unavailability of very high consistency pulp mixer in the industry is a limiting factor for higher than 30% pulp consistency. Temperature and time are quite interrelated and, with the given bleaching conditions, a temperature of 95 °C with 10 min residence time was found to be optimum for this study. It was also observed that multiple pre-washings increase brightness and save bleaching chemicals.https://doi.org/10.1088/2053-1591/ac1ca9bleachingdeinkingrecycled fibersold newsprintpaper brightness |
| spellingShingle | Hassan Zeb Muhammad Asif Hussain Iftikhar Ahmed Muhammad Sarfraz Akram Bilal Haider Rizwan Haider Zaeem Bin Babar Rana Mujahid Saleem Abuzar Ahsan Iqra Aziz Muhammad Arif Study of bleaching of old newsprint recycled paper: reproduction of newspaper material Materials Research Express bleaching deinking recycled fibers old newsprint paper brightness |
| title | Study of bleaching of old newsprint recycled paper: reproduction of newspaper material |
| title_full | Study of bleaching of old newsprint recycled paper: reproduction of newspaper material |
| title_fullStr | Study of bleaching of old newsprint recycled paper: reproduction of newspaper material |
| title_full_unstemmed | Study of bleaching of old newsprint recycled paper: reproduction of newspaper material |
| title_short | Study of bleaching of old newsprint recycled paper: reproduction of newspaper material |
| title_sort | study of bleaching of old newsprint recycled paper reproduction of newspaper material |
| topic | bleaching deinking recycled fibers old newsprint paper brightness |
| url | https://doi.org/10.1088/2053-1591/ac1ca9 |
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