Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Ph. D. Thesıs Modıfıed Wıth Kraft Pulp Productıon Methods Wıth

Hybrıd Poplar (Populus Euramericana I 214)
The increasing demand for raw materials forces the manufacturers to produce products with better quality from the lower quality raw materials. Pulp and paper industry is also looking for ways to improve the quality of their products in the same way. Utilisation of fast groving tree species as a raw material for the pulp industry is going to become an inevitable phenomenon. In this way, raw materials are going to be provided with a more effective and efficient way.
The scope of this study is to characterize the pulp obtained by modified kraft from pretreated hybrid poplar (Populus euroamericana I214). To determine the optimal kraft condition, 9 cookings were performed. According to the pulp yield and the kappa number criteria the following kraft coking conditions were selected: active alkali 18 %, sulphidity 25 %, temperature 170 °C and duration 60 min. Additionaly two modified kraft cooking with 0,1% antraquinone (AQ) and 4% polysulfide (PS) addition were performed, which pulp yield was 46,96%, 48,84% and 48,03% respectively. The polymerization degree of 1318, 1379 and 1396 was obtained for optimal kraft, AQ kraft and PS kraft pulps respectively.
Wood chips were pre-treated (pre-hidrolised) with oxalic acid (OA), organosolv (ethyl alcohol), sodium borohydride (NaBH₄) and enzymes. In order to determine the optimum condition for the pre-treatment, reduced sugars were analyzed.
Assessments of obtained pulps were performed according to the physical strength and optical properties. The highest bursting index of 7,65 kPa.m²/g was obtained for xylanase pre-treated PS kraft pulp. While, the highest tear index of 9.89 mN.m²/g was obtained for sodium borohydride pre-treated PS kraft pulp.
Pre-hydrolysis performed with sodium borohydride was found to be most appropriate application in term of yield, kappa number and viscosity of pulp. Furthermore, enzymatic pre-treatment indicate acceptable results in accordance with pulp yield. The overall benefit of the pre-treatment might be determined after performing of cost analysis of treatment ongoing and profit of obtained by-products.


GÖNÜLTAŞ Oktay

Tez Adı : Doğu Ladini (Picea orientalis) ve Meşe (Quercus spp.) Kabukları Taneninin Biotutkal Üretiminde Kullanılması

Danışman : Prof. Dr. Mualla BALABAN UÇAR

Anabilim Dalı : Orman Endüstri Mühendisliği

Programı : Orman Ürünleri Kimyası ve Teknolojisi

Mezuniyet Yılı : 2013

Tez Savunma Jürisi : Prof. Dr. Mualla BALABAN UÇAR

Prof. Dr. Ahmet KURTOĞLU

Prof. Dr. K. Hüseyin KOÇ

Prof. Dr. Arif KARADEMİR

Doç. Dr. Yalçın ÇÖPÜR