Investigation on production of bleachable chemi-mechanical pulp from wheat straw

In an attempt to develop pulping process suitable for small scale implementation, production of bleachable chemi-mechanical pulp from wheat starw is investigated. Four levels (10, 12, 14 and 16% based on oven dry weight of straw) NaOH and three pulping times (20, 30 and 40 minutes) at 95°C pulping t...

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Autor principal:	Ahmad Jahan latibari
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2011
Materias:	WHEAT STRAW chemi-mechanical pulp yield Strength totally chlorine free Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/97bd4714a5b941f4bfc7b8f9f2da83fd
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spelling	oai:doaj.org-article:97bd4714a5b941f4bfc7b8f9f2da83fd2021-12-02T11:55:25ZInvestigation on production of bleachable chemi-mechanical pulp from wheat straw1735-09132383-112X10.22092/ijwpr.2011.117242https://doaj.org/article/97bd4714a5b941f4bfc7b8f9f2da83fd2011-12-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_117242_0db0a6f0aad0d2977e68963ab0d73fbe.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XIn an attempt to develop pulping process suitable for small scale implementation, production of bleachable chemi-mechanical pulp from wheat starw is investigated. Four levels (10, 12, 14 and 16% based on oven dry weight of straw) NaOH and three pulping times (20, 30 and 40 minutes) at 95°C pulping temperature were used. After digester yield varied between 64.65 and 71.7% and the total yield after defibration was measured as 54.45% and 62%. Unrefined pulp freeness varied between 708 and 765 ml CSF. Pulps produced applying 10-16% NaOH, 40 minutes pulping time and 95°C pulping temperature was selected from further evaluation. These pulps were refined to about 365 ml CSF in a PFI mill and then handsheets were made for strength evaluation. The apparent density of the handsheets varied between 437-488 kg/m3, tear index between 6.51-7.11 mN.m2/g, and tensile index between 29.2 -30.8 N.m/g. Significant difference at 99% was not observed between the strength of the pulps. Then pulp produced applying 10% NaOH, 40 minutes pulping time and 95°C pulping temperature was selected for bleaching trials. Totally Chlorine Free (TCF) bleaching sequence was used for bleaching the selected pulp. Pulps bleached applying 4% H2O2 and 3.5% NaOH, 3% sodium Silicate, 0.5% MgSO4 and 0.3% DTPA for 2 hours showed the highest brightness of 50.69% compared to 29.2% for unbleached pulp.Ahmad Jahan latibariRegional Information Center for Science and Technology (RICeST)articleWHEAT STRAWchemi-mechanical pulpyieldStrengthtotally chlorine freeForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 26, Iss 4, Pp 634-646 (2011)
institution	DOAJ
collection	DOAJ
language	FA
topic	WHEAT STRAW chemi-mechanical pulp yield Strength totally chlorine free Forestry SD1-669.5
spellingShingle	WHEAT STRAW chemi-mechanical pulp yield Strength totally chlorine free Forestry SD1-669.5 Ahmad Jahan latibari Investigation on production of bleachable chemi-mechanical pulp from wheat straw
description	In an attempt to develop pulping process suitable for small scale implementation, production of bleachable chemi-mechanical pulp from wheat starw is investigated. Four levels (10, 12, 14 and 16% based on oven dry weight of straw) NaOH and three pulping times (20, 30 and 40 minutes) at 95°C pulping temperature were used. After digester yield varied between 64.65 and 71.7% and the total yield after defibration was measured as 54.45% and 62%. Unrefined pulp freeness varied between 708 and 765 ml CSF. Pulps produced applying 10-16% NaOH, 40 minutes pulping time and 95°C pulping temperature was selected from further evaluation. These pulps were refined to about 365 ml CSF in a PFI mill and then handsheets were made for strength evaluation. The apparent density of the handsheets varied between 437-488 kg/m3, tear index between 6.51-7.11 mN.m2/g, and tensile index between 29.2 -30.8 N.m/g. Significant difference at 99% was not observed between the strength of the pulps. Then pulp produced applying 10% NaOH, 40 minutes pulping time and 95°C pulping temperature was selected for bleaching trials. Totally Chlorine Free (TCF) bleaching sequence was used for bleaching the selected pulp. Pulps bleached applying 4% H2O2 and 3.5% NaOH, 3% sodium Silicate, 0.5% MgSO4 and 0.3% DTPA for 2 hours showed the highest brightness of 50.69% compared to 29.2% for unbleached pulp.
format	article
author	Ahmad Jahan latibari
author_facet	Ahmad Jahan latibari
author_sort	Ahmad Jahan latibari
title	Investigation on production of bleachable chemi-mechanical pulp from wheat straw
title_short	Investigation on production of bleachable chemi-mechanical pulp from wheat straw
title_full	Investigation on production of bleachable chemi-mechanical pulp from wheat straw
title_fullStr	Investigation on production of bleachable chemi-mechanical pulp from wheat straw
title_full_unstemmed	Investigation on production of bleachable chemi-mechanical pulp from wheat straw
title_sort	investigation on production of bleachable chemi-mechanical pulp from wheat straw
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2011
url	https://doaj.org/article/97bd4714a5b941f4bfc7b8f9f2da83fd
work_keys_str_mv	AT ahmadjahanlatibari investigationonproductionofbleachablechemimechanicalpulpfromwheatstraw
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Investigation on production of bleachable chemi-mechanical pulp from wheat straw

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