Document Type : Research Paper

Authors

• Jalil Roshanasan ¹
• Mohammadreza Dehghani firozabadi ²
• Mohammad Dahmardeh ghaleh no ³
• Saeideh Sharifi ⁴

¹ MS.c., Forestry Wood Technology, Gorgan university of agricultural science and natural resource,

² Assistant pro., Dep., of forestry wood technology master degree, gorgan university of agricultural science and natural resource

³ Lecturer of department of wood and paper science and technology university of zabol

⁴ MS.c., Forestry Wood Technology, Gorgan university of agricultural science and natural resource

Abstract

The lignin dissolution in Kraft pulping for wheat straw was studied. Kraft pulping was carried out under the conditions: chemical charge of 18% (as NaOH, based on o.d. bagasse), sulfidity of 25% and liquor to wheat straw ratio of 10:1. Six cooking maximum temperatures of 85,100,110,120,130 and 150 ^◦C, were selected and reaction time varied from 0 to 250 min. based on maximum temperature. The Klason lignin, acid soluble lignin, ash and extractive contents of wheat straw were 18.4%, 2.07%, 3.24% and 4.56 respectively.
During alkaline pulping of wheat straw, about 64% and 52% of lignin was removed before reaching to the temperature 100 ^◦C and 85 respectively. The values pulp and carbohydrates yield were, about 64%, 58% for 85 ^◦C and 61%, 57% for 100^◦C.

Keywords

• WHEAT STRAW
• Klason lignin
• Acid Soluble Lignin
• Delignification and Kraft

Main Subjects

• Pulp and paper