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Hüseyin Aksel Eren - One of the best experts on this subject based on the ideXlab platform.
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Waterless Bleaching of knitted cotton fabric using supercritical carbon dioxide fluid technology
Cellulose, 2018Co-Authors: Semiha Eren, Ozan Avinc, Zaide Saka, Hüseyin Aksel ErenAbstract:Cotton fiber is the most widely produced and utilized natural fiber with a popular usage in our planet. A substantial amount of clean water is utilized during conventional cotton fiber pretreatment. In this study, we investigated the Bleaching possibility of knitted cotton fabric by using supercritical carbon dioxide as a medium, as a cleaner waterless alternative, at pressures in the range of 180 and 250 bar and at temperatures ranging from 80 °C (at the pressure of 180 bar with 505 kg/m^3) to 120 °C (at the pressure of 250 bar with 539 kg/m^3) for 20 min with either solely hydrogen peroxide usage at 5% and 15% concentrations or combination usage of hydrogen peroxide with necessary related auxiliaries such as peroxide stabilizer at 1% and 8% concentrations and caustic soda at 3% concentration in comparison with conventional aqueous hydrogen peroxide Bleaching Process in order to support environmentally friendly, sustainable textile production leading to more sustainable future for our planet. Also, the effects of different washing types as after-treatment Process following waterless and aqueous peroxide Bleaching Processes on the whiteness performance of cotton fabrics were also explored. Whiteness properties, moisture management performances, oxycellulose formation and FTIR (ATR) spectra of cotton fabrics bleached in aqueous and waterless supercritical carbon dioxide (scCO_2) medium were determined and compared. In waterless scCO_2 media, Bleaching at 80 °C resulted in higher whiteness improvement than Bleaching at 120 °C leading to whiter appearance. Bleaching of cotton cellulosic fiber at 80 °C for 20 min in scCO_2 media displayed better whiteness results than conventional water based Bleaching at 80 °C. The inclusion of caustic soda in waterless scCO_2 hydrogen peroxide Bleaching Process resulted in significant decline on whiteness level of cotton for both 80 °C and 120 °C Bleaching temperatures. When the aqueous conventional Bleaching Process and the anhydrous (waterless supercritical carbon dioxide fluid) Bleaching Process compared in the case of solely hydrogen peroxide usage at both 80 °C and 120 °C, waterless supercritical carbon dioxide fluid Bleaching Process (whether or not after-treated following the Bleaching Process) resulted in higher whiteness values leading to whiter appearance. Bleaching Process with solely 5% and 15% hydrogen peroxide involvement in waterless supercritical carbon dioxide media at 80 °C for only 20 min and without any aqueous after clearing treatment led to approximately 30% and 51% whiteness improvement on cellulosic cotton fiber knitted fabric, respectively. There was no moisture management improvement trend due to caustic soda addition into peroxide Bleaching Process in waterless scCO_2 media. The addition of after-treatment Process (catalase enzyme treatment in water at 50 °C and then washed with water at 87 °C in company with wetting agent and rinsing in cold water) following peroxide Bleaching in scCO_2 media improved the moisture management properties of bleached cotton fabric. Although the Bleaching Process performed in scCO_2 medium resulted in a higher oxidative activity than Bleaching Process performed in aqueous medium from the measured color yield values of oxycellulose formation evaluation, the consistency of the FTIR (ATR) spectra of the greige, hydrogen peroxide bleached in aqueous and waterless scCO_2 media and bleached then after-treated cotton knitted fabrics displays that the respective Bleaching Process types in both aqueous and waterless scCO_2 media had no drastic significant detrimental effect on the surface morphology of the cotton fiber. Consequently, successful waterless hydrogen peroxide Bleaching can be carried out for cellulosic cotton fiber knitted fabric in supercritical carbon dioxide media. Graphical abstract
Semiha Eren - One of the best experts on this subject based on the ideXlab platform.
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Waterless Bleaching of knitted cotton fabric using supercritical carbon dioxide fluid technology
Cellulose, 2018Co-Authors: Semiha Eren, Ozan Avinc, Zaide Saka, Hüseyin Aksel ErenAbstract:Cotton fiber is the most widely produced and utilized natural fiber with a popular usage in our planet. A substantial amount of clean water is utilized during conventional cotton fiber pretreatment. In this study, we investigated the Bleaching possibility of knitted cotton fabric by using supercritical carbon dioxide as a medium, as a cleaner waterless alternative, at pressures in the range of 180 and 250 bar and at temperatures ranging from 80 °C (at the pressure of 180 bar with 505 kg/m^3) to 120 °C (at the pressure of 250 bar with 539 kg/m^3) for 20 min with either solely hydrogen peroxide usage at 5% and 15% concentrations or combination usage of hydrogen peroxide with necessary related auxiliaries such as peroxide stabilizer at 1% and 8% concentrations and caustic soda at 3% concentration in comparison with conventional aqueous hydrogen peroxide Bleaching Process in order to support environmentally friendly, sustainable textile production leading to more sustainable future for our planet. Also, the effects of different washing types as after-treatment Process following waterless and aqueous peroxide Bleaching Processes on the whiteness performance of cotton fabrics were also explored. Whiteness properties, moisture management performances, oxycellulose formation and FTIR (ATR) spectra of cotton fabrics bleached in aqueous and waterless supercritical carbon dioxide (scCO_2) medium were determined and compared. In waterless scCO_2 media, Bleaching at 80 °C resulted in higher whiteness improvement than Bleaching at 120 °C leading to whiter appearance. Bleaching of cotton cellulosic fiber at 80 °C for 20 min in scCO_2 media displayed better whiteness results than conventional water based Bleaching at 80 °C. The inclusion of caustic soda in waterless scCO_2 hydrogen peroxide Bleaching Process resulted in significant decline on whiteness level of cotton for both 80 °C and 120 °C Bleaching temperatures. When the aqueous conventional Bleaching Process and the anhydrous (waterless supercritical carbon dioxide fluid) Bleaching Process compared in the case of solely hydrogen peroxide usage at both 80 °C and 120 °C, waterless supercritical carbon dioxide fluid Bleaching Process (whether or not after-treated following the Bleaching Process) resulted in higher whiteness values leading to whiter appearance. Bleaching Process with solely 5% and 15% hydrogen peroxide involvement in waterless supercritical carbon dioxide media at 80 °C for only 20 min and without any aqueous after clearing treatment led to approximately 30% and 51% whiteness improvement on cellulosic cotton fiber knitted fabric, respectively. There was no moisture management improvement trend due to caustic soda addition into peroxide Bleaching Process in waterless scCO_2 media. The addition of after-treatment Process (catalase enzyme treatment in water at 50 °C and then washed with water at 87 °C in company with wetting agent and rinsing in cold water) following peroxide Bleaching in scCO_2 media improved the moisture management properties of bleached cotton fabric. Although the Bleaching Process performed in scCO_2 medium resulted in a higher oxidative activity than Bleaching Process performed in aqueous medium from the measured color yield values of oxycellulose formation evaluation, the consistency of the FTIR (ATR) spectra of the greige, hydrogen peroxide bleached in aqueous and waterless scCO_2 media and bleached then after-treated cotton knitted fabrics displays that the respective Bleaching Process types in both aqueous and waterless scCO_2 media had no drastic significant detrimental effect on the surface morphology of the cotton fiber. Consequently, successful waterless hydrogen peroxide Bleaching can be carried out for cellulosic cotton fiber knitted fabric in supercritical carbon dioxide media. Graphical abstract
Zaide Saka - One of the best experts on this subject based on the ideXlab platform.
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Waterless Bleaching of knitted cotton fabric using supercritical carbon dioxide fluid technology
Cellulose, 2018Co-Authors: Semiha Eren, Ozan Avinc, Zaide Saka, Hüseyin Aksel ErenAbstract:Cotton fiber is the most widely produced and utilized natural fiber with a popular usage in our planet. A substantial amount of clean water is utilized during conventional cotton fiber pretreatment. In this study, we investigated the Bleaching possibility of knitted cotton fabric by using supercritical carbon dioxide as a medium, as a cleaner waterless alternative, at pressures in the range of 180 and 250 bar and at temperatures ranging from 80 °C (at the pressure of 180 bar with 505 kg/m^3) to 120 °C (at the pressure of 250 bar with 539 kg/m^3) for 20 min with either solely hydrogen peroxide usage at 5% and 15% concentrations or combination usage of hydrogen peroxide with necessary related auxiliaries such as peroxide stabilizer at 1% and 8% concentrations and caustic soda at 3% concentration in comparison with conventional aqueous hydrogen peroxide Bleaching Process in order to support environmentally friendly, sustainable textile production leading to more sustainable future for our planet. Also, the effects of different washing types as after-treatment Process following waterless and aqueous peroxide Bleaching Processes on the whiteness performance of cotton fabrics were also explored. Whiteness properties, moisture management performances, oxycellulose formation and FTIR (ATR) spectra of cotton fabrics bleached in aqueous and waterless supercritical carbon dioxide (scCO_2) medium were determined and compared. In waterless scCO_2 media, Bleaching at 80 °C resulted in higher whiteness improvement than Bleaching at 120 °C leading to whiter appearance. Bleaching of cotton cellulosic fiber at 80 °C for 20 min in scCO_2 media displayed better whiteness results than conventional water based Bleaching at 80 °C. The inclusion of caustic soda in waterless scCO_2 hydrogen peroxide Bleaching Process resulted in significant decline on whiteness level of cotton for both 80 °C and 120 °C Bleaching temperatures. When the aqueous conventional Bleaching Process and the anhydrous (waterless supercritical carbon dioxide fluid) Bleaching Process compared in the case of solely hydrogen peroxide usage at both 80 °C and 120 °C, waterless supercritical carbon dioxide fluid Bleaching Process (whether or not after-treated following the Bleaching Process) resulted in higher whiteness values leading to whiter appearance. Bleaching Process with solely 5% and 15% hydrogen peroxide involvement in waterless supercritical carbon dioxide media at 80 °C for only 20 min and without any aqueous after clearing treatment led to approximately 30% and 51% whiteness improvement on cellulosic cotton fiber knitted fabric, respectively. There was no moisture management improvement trend due to caustic soda addition into peroxide Bleaching Process in waterless scCO_2 media. The addition of after-treatment Process (catalase enzyme treatment in water at 50 °C and then washed with water at 87 °C in company with wetting agent and rinsing in cold water) following peroxide Bleaching in scCO_2 media improved the moisture management properties of bleached cotton fabric. Although the Bleaching Process performed in scCO_2 medium resulted in a higher oxidative activity than Bleaching Process performed in aqueous medium from the measured color yield values of oxycellulose formation evaluation, the consistency of the FTIR (ATR) spectra of the greige, hydrogen peroxide bleached in aqueous and waterless scCO_2 media and bleached then after-treated cotton knitted fabrics displays that the respective Bleaching Process types in both aqueous and waterless scCO_2 media had no drastic significant detrimental effect on the surface morphology of the cotton fiber. Consequently, successful waterless hydrogen peroxide Bleaching can be carried out for cellulosic cotton fiber knitted fabric in supercritical carbon dioxide media. Graphical abstract
Ozan Avinc - One of the best experts on this subject based on the ideXlab platform.
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Waterless Bleaching of knitted cotton fabric using supercritical carbon dioxide fluid technology
Cellulose, 2018Co-Authors: Semiha Eren, Ozan Avinc, Zaide Saka, Hüseyin Aksel ErenAbstract:Cotton fiber is the most widely produced and utilized natural fiber with a popular usage in our planet. A substantial amount of clean water is utilized during conventional cotton fiber pretreatment. In this study, we investigated the Bleaching possibility of knitted cotton fabric by using supercritical carbon dioxide as a medium, as a cleaner waterless alternative, at pressures in the range of 180 and 250 bar and at temperatures ranging from 80 °C (at the pressure of 180 bar with 505 kg/m^3) to 120 °C (at the pressure of 250 bar with 539 kg/m^3) for 20 min with either solely hydrogen peroxide usage at 5% and 15% concentrations or combination usage of hydrogen peroxide with necessary related auxiliaries such as peroxide stabilizer at 1% and 8% concentrations and caustic soda at 3% concentration in comparison with conventional aqueous hydrogen peroxide Bleaching Process in order to support environmentally friendly, sustainable textile production leading to more sustainable future for our planet. Also, the effects of different washing types as after-treatment Process following waterless and aqueous peroxide Bleaching Processes on the whiteness performance of cotton fabrics were also explored. Whiteness properties, moisture management performances, oxycellulose formation and FTIR (ATR) spectra of cotton fabrics bleached in aqueous and waterless supercritical carbon dioxide (scCO_2) medium were determined and compared. In waterless scCO_2 media, Bleaching at 80 °C resulted in higher whiteness improvement than Bleaching at 120 °C leading to whiter appearance. Bleaching of cotton cellulosic fiber at 80 °C for 20 min in scCO_2 media displayed better whiteness results than conventional water based Bleaching at 80 °C. The inclusion of caustic soda in waterless scCO_2 hydrogen peroxide Bleaching Process resulted in significant decline on whiteness level of cotton for both 80 °C and 120 °C Bleaching temperatures. When the aqueous conventional Bleaching Process and the anhydrous (waterless supercritical carbon dioxide fluid) Bleaching Process compared in the case of solely hydrogen peroxide usage at both 80 °C and 120 °C, waterless supercritical carbon dioxide fluid Bleaching Process (whether or not after-treated following the Bleaching Process) resulted in higher whiteness values leading to whiter appearance. Bleaching Process with solely 5% and 15% hydrogen peroxide involvement in waterless supercritical carbon dioxide media at 80 °C for only 20 min and without any aqueous after clearing treatment led to approximately 30% and 51% whiteness improvement on cellulosic cotton fiber knitted fabric, respectively. There was no moisture management improvement trend due to caustic soda addition into peroxide Bleaching Process in waterless scCO_2 media. The addition of after-treatment Process (catalase enzyme treatment in water at 50 °C and then washed with water at 87 °C in company with wetting agent and rinsing in cold water) following peroxide Bleaching in scCO_2 media improved the moisture management properties of bleached cotton fabric. Although the Bleaching Process performed in scCO_2 medium resulted in a higher oxidative activity than Bleaching Process performed in aqueous medium from the measured color yield values of oxycellulose formation evaluation, the consistency of the FTIR (ATR) spectra of the greige, hydrogen peroxide bleached in aqueous and waterless scCO_2 media and bleached then after-treated cotton knitted fabrics displays that the respective Bleaching Process types in both aqueous and waterless scCO_2 media had no drastic significant detrimental effect on the surface morphology of the cotton fiber. Consequently, successful waterless hydrogen peroxide Bleaching can be carried out for cellulosic cotton fiber knitted fabric in supercritical carbon dioxide media. Graphical abstract
Zhang Wei - One of the best experts on this subject based on the ideXlab platform.
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A Study on the Activation on Hydrogen Peroxide of Caprolactam in Bleaching Process
Advanced Textile Technology, 2010Co-Authors: Zhang WeiAbstract:Through the research on the effects of 3 factors,the dose of caprolactam,time of cold pad-bath method and the dose of alkali,on the whiteness of fabric,the activation on hydrogen peroxide of caprolactam in Bleaching Process was mainly studied.Then the optimum application condition of caprolactam activation was obtained,e.g.cold pad-batch Process temperature 33℃,the dose of H2O2(30%)50g/L,the dose of caprolactam 9g/L,time of cold pad-bath Process 16h,and the dose of alkali 15g/L.
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XPS analysis of bamboo dissolving pulp in Bleaching Process
Textile Research Journal, 2009Co-Authors: He Jianxin, Zhang WeiAbstract:The change of surface chemical composition of bamboo pulp at Bleaching stage during its preparation was analyzed with X-ray photoelectron spectroscopy(XPS).The ratio of O/C increased during Bleaching Process except Bleaching stage,indicating the surface concentrations of lignin and extractive were reduced except Bleaching stage.The calculation of lignin and extractive contents on the surface of bamboo pulp showed that the decrease of O/C in the stage of H2O2Bleaching was primarily due to the transition of extractives from internal to surface.When further extraction was performed at the end of Bleaching,the ratio of O/C approached to the theoretical value of cellulose.The contents of C1—C4 in C1s peaks for bamboo pulp obtained in various Bleaching stage were analyzed,and how the chemical composition of bamboo pulp varies with the Bleaching progressing was disclosed.The results also demonstrated that there was the same effect for xylanase and DMD treatments,that is,hemicellulose and lignin were removed effectively.
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SOFT MEASUREMENT OF pH IN PULP Bleaching Process BASED ON PCA-RBFN
Journal of Northwest Institute of Light Industry, 2002Co-Authors: Zhang WeiAbstract:The paper is about soft measurement of pH in pulp Bleaching Process. It contains choiceness of auxiliary variables based on working principium of pulp Bleaching Process and PCA, building up RBFN model for soft measurement, etc. Results of simulation show that the way is effective, reliable and satisfy in accuracy and property of real time.
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MIMO Soft Measurement of Pulp Bleaching Process Based on Working Principium of the Process and PCA
Control and Instruments in Chemical Industry, 2002Co-Authors: Zhang WeiAbstract:In the paper,a method of choosing auxiliary variables in MIMO soft measurement is presented,the method is based on working principium of pulp Bleaching Process and PCA,RBFN model for MIMO soft measurement of pH and remaining chlorine is established.Result of simulation shows that the way is effective,reliable and satisfy in accuracy and property of real time.