نقش پیش هیدرولیزاسیدی در تولید خمیر حل‌شونده از مقوای کنگره‌ای کهنه

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه فناوری سلولز و کاغذ، دانشگاه شهید بهشتی، زیرآب، ایران

2 استادیار گروه فناوری سلولز و کاغذ، دانشگاه شهید بهشتی، زیرآب، ایران

3 دانشیار گروه فناوری سلولز و کاغذ، دانشگاه شهید بهشتی، زیرآب، ایران

چکیده

عملیات پیش‌هیرولیز اسیدی با هدف حذف همی‌سلولزها یکی از مراحل اصلی در تولید خمیرهای حل‌شونده از منابع چوبی است. تحقیق حاضر به بررسی ضرورت اعمال این تیمار در تولید خمیرحل‌شونده از مقوای کنگره‌ای کهنه می‌پردازد. بدین منظور ابتدا شرایط دمای 130 درجه سانتی‌گراد، غلظت اسید 1 درصد، زمان 30 دقیقه و نسبت لیکور به کاغذباطله 7:1 بعنوان پیش‌تیمار اسیدی برگزیده شد و در ادامه ویژگی‌های کیفی دو نمونه دارای پیش‌هیدرولیز و فاقد پیش‌هیدرولیز پس از پخت با یکدیگر مقایسه شد. نتایج نشان داد که به استثنای شاخص واکنش‌پذیری، سایر ویژگی‌های مورد نیاز خمیر‌حل‌شونده مانند دسترسی-پذیری، درجه بسپارش و میزان سلولز آلفا در اثر اعمال پیش‌تیمار اسیدی دچار نقصان می‌شوند. نتایج مربوط به اندازه‌گیری بازده و ترکیبات شیمیایی نیز حاکی از آسیب رساندن این مرحله به نمونه‌ها بود. در نهایت، با در نظر گرفتن اهمیت شاخصه‌های کیفی برتر خمیرهای فاقد پیش‌هیدولیز اسیدی و نیز قابل قبول بودن مقدار واکنش‌‌پذیری این نمونه‌ها، نه تنها ضرورت اعمال تیمار مذکور شناخته نشد بلکه توصیه به عدم استفاده از آن بود.

کلیدواژه‌ها

موضوعات


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