Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

Mussatto, Solange I.; Rocha, George J. M.; Roberto, Inês Conceição

doi:10.1007/s10570-008-9198-4

Cited by 66 publications

(38 citation statements)

References 24 publications

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“…Subsequently, the pulp was bleached by a totally chlorine‐free sequence carried out in three stages, using 5% (v/v) hydrogen peroxide in the first two stages and 0.25 mol L −1 NaOH solution in the last stage. Using this procedure, a bleached pulp presenting a kappa number of 11.21, viscosity of 3.12 cP, brightness of 71.3%, cellulose content of 957 g kg −1 and residual lignin of 34 g kg −1 was obtained from BSG …”

Section: Bsg Use In Chemical Processesmentioning

confidence: 99%

Brewer's spent grain: a valuable feedstock for industrial applications

Mussatto

2014

J. Sci. Food Agric.

445

323

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Brewer's spent grain (BSG) is the most abundant by-product generated from the beer-brewing process, representing approximately 85% of the total by-products obtained. This material is basically constituted by the barley grain husks obtained as solid residue after the wort production. Since BSG is rich in sugars and proteins, the main and quickest alternative for elimination of this industrial by-product has been as animal feed. However, BSG is a raw material of interest for application in different areas because of its low cost, large availability throughout the year and valuable chemical composition. In the last decade, many efforts have been directed towards the reuse of BSG, taking into account the incentive that has been given to recycle the wastes and by-products generated by industrial activities. Currently, many interesting and advantageous methods for application of BSG in foods, in energy production and in chemical and biotechnological processes have been reported. The present study presents and discusses the most recent perspectives for BSG application in such areas.

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Section: Bsg Use In Chemical Processesmentioning

confidence: 99%

Brewer's spent grain: a valuable feedstock for industrial applications

Mussatto

2014

J. Sci. Food Agric.

445

323

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“…Hal ini dikarenakan lignin pada proses manufaktur kertas akan menurunkan tingkat kecerahan (brightness) sehingga harus dihilangkan secara maksimal, sedangkan hemiselulosa pada kandungan tinggi dapat menurunkan sifat mekanik paper karena adanya penurunan resistensi individu seratnya. Selain itu, adanya hemiselulosa juga menurunkan sifat optik (transparansi) karena sifatnya yang keruh (opacity) (Mussatto, Rocha, dan Roberto 2008). NaOCl 2 , berbentuk kristal putih adalah bahan pemutih serat selulosa yang lembut yang tidak akan merusak secara dekstruktif bahkan jika diproses pada temperatur yang tinggi 100 ᵒC selama beberapa jam (Rahmidar, Nurilah, dan Sudiarty 2018;Putera 2012) 37,6 ± 0,3 23,9 ± 0,3 38,5± 0,0 TKS delignifinasi NaOH 73,0 ± 0,2 14,9 ± 0,2 12,1 ± 0,5 TKS hasil pemutihan NaClO2 1x pemutihan 81.5 ± 2,1 12,7 ± 0,0 5,8 ± 2,1 NaClO2 2x pemutihan 84,1 ± 0,0 12,7 ± 0,1 3,2 ± 0,1 NaClO2 3x pemutihan 84,3 ± 0,3 12,6 ± 0,1 3,1 ± 0,2 Selulosa Standar 80,8 16,6 2,6…”

Section: Pemutihan Dengan Naclounclassified

Pengaruh Proses Pemutihan Multi Tahap Serat Selulosa Dari Limbah Tandan Kosong Kelapa Sawit

2018

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ABSTRAK PENGARUH PROSES PEMUTIHAN MULTI TAHAP SERAT SELULOSA DARI LIMBAH TANDAN KOSONG KELAPA SAWIT. Penelitian ini bertujuan untuk meningkatkan kandungan selulosa limbah tandan kosong kelapa sawit melalui proses bertahap delignifikasi NaOH dilanjutkan dengan pemutihan menggunakan NaClO2. Hasil penelitian menunjukkan bahwa kandungan selulosa limbah tandan kosong kelapa sawit berhasil ditingkatkan hingga hampir dua kali dari 37,6 ± 0,3% menjadi 84,2 ± 0,3%. Lebih lanjut, proses pemutihan multi tahap menggunakan NaClO2 dapat menurunkan kandungan lignin tandan kosong kelapa sawit menjadi sebesar 3,1 ± 0,2% hampir sama dengan standar selulosa, yaitu 2,6%. Penggunaan NaClO2 juga mampu menurunkan kadar hemiselulosa hingga 12,6%, lebih rendah dibandingkan standar selulosa, yaitu 16,6%. Dari hasil FTIR, gugus puncak serapan selulosa meningkat secara signifikan, sedangkan hemiselulosa dan lignin mengalami penurunan intensitas. Analisa SEM menunjukkan bahwa proses delignifikasi basa dan pemutihan menyebabkan permukaan serat TKS berpori dan bersih yang mengindikasikan berkurangnya lignin dan hemiselulosa. Berdasarkan hasil penelitian ini, proses delignifikasi NaOH dan pemutihan NaClO2 memiliki selektivitas tinggi yang dapat secara simultan mengurangi kadar hemiselulosa dan lignin tanpa merusak struktur selulosa.Kata kunci : Tandan kosong kelapa sawit, Delignifikasi, Pemutihan, Selulosa ABSTRACT THE EFFECT OF MULTI STAGE BLEACHING PROCESS ON CELLULOSIC FIBRE BASED ON OIL PALM EMPTY FRUIT BUNCHES.This study aims to increase the cellulose content of oil palm empty fruit bunch by sequential delignification using NaOH followed by bleaching process using NaClO2. Results showed that the cellulose content increased twice than the initial content, from 37.6 ± 0.3% to 84.2 ± 0.3%. Moreover, after the bleaching process using NaClO2 and two times of washing, the lignin content can be reduced to 3.1 ± 0.2 %, which was almost similar with cellulose standard (2.6%). Correspondingly, the utilization of NaClO2 also reduced the hemicellulose content to 12.6%, even lower than the cellulose standard (16.6%). FTIR spectrum showed that the peak absorption of cellulose increased significantly after the sequential process of delignification-bleaching. SEM analysis showed an increased in the porosity of the fiber. The bleached OPEFB was cleaner which indicated the removal of lignin and hemicellulose along with other extractives. From this result, it can be concluded that delignification using NaOH and bleaching using NaClO2 offered high selectivity which simultaneously reduced the hemicellulose and lignin content without disrupting the structure of cellulose.

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“…Diferentes tecnologias têm sido desenvolvidas no campo da aplicação do peróxido de hidrogênio. Atualmente a combinação do peróxido de hidrogênio e dióxido de cloro se tornou a maneira mais eficiente de branquear polpas sem cloro elementar (ECF), e peróxido de hidrogênio com oxigênio e ozônio a mais eficiente em polpas totalmente livres de cloro (TCF) [71], [72], [73], [74].…”

Section: Métodos De Obtenção De "Microfibras" E "Nanofibras" De Celulunclassified

Películas biodegradables: la incorporación de microfibras y nanofibras de celulosa obtenido a partir de fuentes vegetales

2011

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ResumenDiferentes estudos têm evidenciado que a celulose incorporada a matrizes poliméricas atua como um material de reforço, melhorando a resistência mecânica de filmes biodegradáveis e em alguns casos, a permeabilidade ao vapor de água. A eficácia deste reforço está associada à natureza da celulose, sua cristalinidade e as características da interface reforço/matriz polimérica. O estudo de microfibras e nanofibras de celulose como uma fase de reforço em filmes biodegradáveis começou há 15 anos. Desde então, tem aumentado o interesse em desenvolver metodologias focadas ao aproveitamento de resíduos agrícolas para a obtenção de fibras e a incorporação desses materiais em matrizes poliméricas. Diante disto, este trabalho apresenta uma revisão bibliográfica sobre microfibras e nanofibras de celulose como materiais de reforço em filmes biodegradáveis a base de biopolímeros. Abordam-se tópicos como as fibras vegetais, dada sua natureza lignocelulósica, as diferenças entre microfibras e nanofibras, fontes vegetais exploradas e métodos desenvolvidos na última década para a obtenção desses materiais. Finalmente, uma compilação de trabalhos recentes sobre microcompósitos e nanocompósitos biodegradáveis mostra resultados promissores nas propriedades mecânicas e de barreira dessas estruturas poliméricas. A informação apresentada evidencia o potencial desta área de pesquisa para futuros trabalhos que podem ser conduzidos para desenvolvimento de tecnologia de produção desses materiais em escala industrial e sua utilização como embalagens de alimentos. AbstractDifferent studies have shown that cellulose incorporated into polymeric matrices acts as a reinforcing material that improves the mechanical strength of biodegradable films and, in some cases, the water vapor permeability. The efficacy of this reinforcement is associated with the nature of cellulose, its crystallinity, and the characteristics of the reinforcement/polymeric matrix interface. Studies on cellulose micro and nanofibers as a reinforcing phase in biodegradable films began 15 years ago. Since then there has been an increasing interest in the use of agricultural wastes and in the study of processes for the attainment and incorporation of these materials into polymeric matrices. Thus, this paper presents a literature review on cellulose microfibers and nanofibers as reinforcing materials in biodegradable films based on biopolymers.

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Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

Cited by 66 publications

References 24 publications

Brewer's spent grain: a valuable feedstock for industrial applications

Brewer's spent grain: a valuable feedstock for industrial applications

Pengaruh Proses Pemutihan Multi Tahap Serat Selulosa Dari Limbah Tandan Kosong Kelapa Sawit

Películas biodegradables: la incorporación de microfibras y nanofibras de celulosa obtenido a partir de fuentes vegetales

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