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اثر پیش استخراج های هیدرولیز با آب داغ و قلیا بر ویژگی های خمیر کاغذ های تولید شده با فرآیند مونواتانول آمین- آنتراکینون از باگاس | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 9، دوره 34، شماره 3 - شماره پیاپی 69، آذر 1398، صفحه 409-423 اصل مقاله (689.02 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2019.126944.1559 | ||
| نویسندگان | ||
| کژال مرادیان گیلان1؛ سحاب حجازی* 1؛ علی عبدالخانی1؛ هریرت سیکستا2 | ||
| 1گروه علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 2گروه محصولات و سیستمهای زیستی، دانشگاه آلتو، اسپو، فنلاند | ||
| چکیده | ||
| در این تحقیق، تأثیر پیش استخراجهای آب داغ و قلیا بر روی ویژگیهای خمیرکاغذهای مونواتانول آمین-آنتراکینون باگاس مورد بررسی قرار گرفت و نتایج با خمیرکاغذسازی سودا مقایسه شد. پیش استخراج قلیای 10% در مدت زمان 30 دقیقه با میزان بازده کل 7/94 درصد و بازده هولوسلولز برابر با 6/71 درصد و پیش استخراج آب داغ، با نسبت مایع به باگاس 10 به 1 در مدت زمان 45 دقیقه با میزان بازده کل 94 درصد و بازده هولوسلولز 4/69 درصد، به عنوان تیمارهای بهینه انتخاب گردیدند. مونواتانول آمین به صورت خالص ودر نسبت های مختلف همراه با آب استفاده شد. عامل متغیر، نسبت مونواتانول آمین به آب در سه نسبت 100 به 0، 75 به 25 و 50 به 50 بود و عوامل ثابت شامل نسبت مایع پخت به باگاس6 به1، زمان پخت در دمای بیشینه 60 دقیقه، دمای پخت C◦ 165 و 1/0% آنتراکینون در نظر گرفته شدند. بر اساس نتایج به دست آمده، خمیرکاغذهای تولید شده با نسبت مونو اتانول آمین به آب 75 به 25 (ازباگاس پیش استخراج نشده)، دارای بیشترین بازده کل (9/61) و عدد کاپای قابل قبول (5/19) بودند . مرحله پیش استخرا ج سبب بهبود بازده خمیرکاغذ، در هر دو فرآیند مونواتانول آمین-آنتراکینون و سودا شد. بعد از پیش استخراج، شاخص مقاومت به کشش و طول پارگی خمیرکاغذهای حاصله افت کرد. برخلاف این دو عامل، شاخص مقاومت به پارگی خمیرکاغذهای حاصل از باگاس پیش استخراج شده، افزایش پیدا کرد. درجه روشنی خمیرکاغذهای سودا حاصل از باگاس استخراج شده و نشده در مقایسه با خمیرکاغذهای مونواتانول آمین بیشتر بود. ماتی خمیرکاغذها بعد از مرحله پیش استخراج تقریبا بدون تغییر باقی ماند. | ||
| کلیدواژهها | ||
| پیش استخراج؛ آب داغ؛ قلیا؛ باگاس؛ خمیرکاغذ سازی مونواتانول آمین | ||
| عنوان مقاله [English] | ||
| The effect of hot water and alkaline pre-extractions on properties of bagasse pulps produced by monoethanolamine-AQ process | ||
| نویسندگان [English] | ||
| Kajal Moradian Gilan1؛ Sahab Hedjazi1؛ Ali Abdulkhani1؛ Herbert Sixta2 | ||
| 1Department of wood science & technology, Faculty of natural resources, University of Tehran, Karaj, Iran | ||
| 2Department of Forest Products Technology, School of Chemical Technology, Aalto University, Espoo, Finland | ||
| چکیده [English] | ||
| In this research, the effect of hot water and alkaline pre-extractions on properties of bagasse monoethanolamine-AQ pulps was investigated and the results were compared with that of soda pulping. The pre-extraction with alkaline charge of 10%, time of 30 min resulted in total yield and holocellulose of 94.7% and 71.6%, respectively. The hot water pre-extraction with L/W of 10/1 and time of 45min lead to total yield and hollocellulose of 94% and 69.4%, respectively. These trails were selected as the optimum conditions. Monoethanolamine was used as pure and also in different proportions with water for cooking unextracted and pre-extracted bagasse. Variables in monoethanoleamine pulpng were ratio of monoethanolamine to water at three levels (100/0, 75/25, and 50/50%) and the ratio of the liquor to bagasse of 6 to 1, cooking time of 60 min, the temperature of 165°C and AQ charge of 0.1% considered as constant. According to the results, the MEA-AQ pulps produced with MEA/H2O ratio of 75/25 (from unextracted bagasse) have the highest total yield (61.9 %) and the acceptable kappa number (19.5). Pre-extraction resulted in improving of the yield in both MEA-AQ and soda pulping processes. After pre-extraction, the tensile index and breaking length of pulps dropped. In contrast, the tear index of pulps produced from pre-extracted bagasse in both pulping processes was increased. The brightness of soda pulps from un- and pre-extracted bagasse was more than that of MEA-AQ pulps. After pre-extraction, the opacity of pulps remains almost unchanged. | ||
| کلیدواژهها [English] | ||
| pre-extraction, hot water, alkaline. bagasse, monoethanolamine pulping | ||
| مراجع | ||
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