scholarly journals Comparison of Different Alkali Treatment of Bagasse and Rice Straw

2004 ◽  
Vol 17 (10) ◽  
pp. 1430-1433 ◽  
Author(s):  
W. Suksombat
Keyword(s):  
Rice Straw ◽  
Alkali Treatment

scholarly journals The study of patterns of influence of alkali treatment on properties of organosolvent cellulose from straw of rice

2018 ◽  
Author(s):  
А.В. Вураско ◽  
Е.И. Симонова ◽  
А.Р. Минакова ◽  
Д.Д. Манойлович
Keyword(s):  
Metal Ions ◽  
Rice Straw ◽  
Lignin Content ◽  
Alkali Treatment ◽  
Alkaline Treatment ◽  
Raw Material ◽  
High Yield ◽  
Color Determination ◽  
Visual Color

Получение доступных сорбентов на основе природных материалов, для визуального колористического определения содержания ионов металлов в загрязненных природных и сточных водах является актуальным направлением исследований. Сорбенты на основе технической целлюлозы удовлетворяют этим требованиям. В работе для получения технической целлюлозы предложено использовать биомассу соломы риса. Для удаления из соломы риса минерального компонента при проведении окислительно-органосольвентной варки используют стадию щелочной обработки, которая приводит к деструкции полисахаридов, снижая выход технической целлюлозы. В связи с этим целью работы является изучение закономерностей проведения щелочной обработки соломы риса для максимального сохранения высокого выхода технической целлюлозы, извлечения минеральной части и возможности применения данной целлюлозы в качестве колористического сорбента. С учетом предварительных исследований найдены оптимальные значения технологических факторов, обеспечивающих высокий выход волокнистого материала из соломы риса при минимальном содержании в нем минеральных компонентов. Последующая органосольвентная варка позволяет получить техническую целлюлозу с выходом – 48,8% от абсолютно сухого сырья (а.с.с), зольностью 0,05% от а.с.с., содержанием лигнина 2,5% от а.с.с., удовлетворительными прочностными характеристиками, высокими сорбционными свойствами, необходимой белизной и рН водной вытяжки. Выявлено, что техническая целлюлоза из соломы риса содержит металлы, накопленные биомассой за вегетативный период. Щелочная обработка и окислительно-органосольвентная делигнификация в большинстве случаев приводят к снижению концентрации металлов в технической целлюлозе. Исключение составляют алюминий, железо и свинец, содержание которых в технической целлюлозе увеличивается. Таким образом, целлюлоза, полученная в оптимальных условиях щелочной обработки и последующей окислительно-органосольвентной варки из соломы риса, с учетом содержащихся в ней металлов, пригодна для использования в качестве сорбента для визуального колористического определения содержания ионов металлов в загрязненных природных и сточных водах. Receive available sorbents based on natural materials for visual color determination of the content of metal ions in contaminated natural and waste waters is a topical area of research. Sorbents on the basis of technical cellulose satisfy these requirements. In the process of obtaining technical cellulose is proposed to use biomass straw rice. Removal of straw rice mineral component when carrying out the oxidation-organosolvent use the cooking stage alkali treatment, which leads to degradation of polysaccharides, reducing the output of technical cellulose. In this regard, the aim of this work is to study the regularities of the alkaline treatment of rice straw for maximum preservation of the high output technical cellulose, extracting the mineral and the possibility of using the cellulose as the colour of the sorbent. Taking into account the preliminary studies, optimal conditions of technological factors were found ensuring a high yield of fibrous material from rice straw with a minimum content of mineral components in it. Subsequent organosolvent pulping yields technical pulp with a yield of 48.8% bone dry raw material (BDRM), an mineral ash content of 0.05% of BDRM, a lignin content of 2.5% of BDRM, satisfactory strength properties, high sorption properties, the necessary whiteness and pH of aqueous extract. It is revealed that the technical cellulose from straw of rice contains metals accumulated biomass during the vegetation period. Alkaline treatment and oxidative-organosolvent the delignification in most cases leads to a decrease of metal concentrations in pulp technical. With the exception of aluminum, iron and lead, the content of which is technical cellulose increases. Thus, cellulose obtained in optimum conditions of alkaline treatment and subsequent oxidation-organosolvent pulping of straw of rice, taking into account the contained metals suitable for use as a sorbent for visual color determination of the content of metal ions in polluted natural and sewage waters.

Effects of Different Treatments on Surface Activity of Rice Straw Particleboard

2020 ◽  
Vol 12 (2) ◽  
pp. 289-295 ◽  
Author(s):  
Xian-Qing Xiong ◽  
Ying-Ying Yuan ◽  
Yi-Ting Niu ◽  
Liang-Ting Zhang ◽  
Zhi-Hui Wu
Keyword(s):  
Rice Straw ◽  
Surface Activity ◽  
Treatment Time ◽  
Ph Value ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Surface Absorption ◽  
Bonding Performance ◽  
Absorption Performance ◽  
Corona Treatment

The surface activity of rice straw particleboard (RSP), which has a significant effect on the finishing and bonding performance, is reduced by wax coating and free radicals on the straw fiber. The RSP surface was treated by corona treatment and alkali treatment to reveal the effects of different treatments on the surface activity of RSP. The infiltration height method was applied to evaluate the variation of surface activity. The alkalized samples of RSP with different densities were prepared by using sodium hydroxide solution with pH value of 8∼14. The samples of different densities were then subjected to corona treatment under high purity oxygen conditions with treatment power of 50 W, 100 W, 300 W, and 500 W and with a time of 4 min or 7 min. The surface activity of the treated specimens was evaluated by measuring the absorption properties of three kinds of liquids by infiltration-height method: distilled water, glycerin, and alcohol. The results revealed the following. (1) After alkalization treatment, the surface absorption performance of RSP for these three liquids was improved, and it increased with the increase of pH value of the treatment solution. The suitable pH value of the alkalized solution for RSP is 7∼11, which can improve the surface absorption performance. (2) After corona treatment, the surface absorption performance of RSP increased with the increase of corona treatment power. RSP had the highest surface absorption performance for alcohol. With the density of RSP increased, the surface absorbability slightly decreased. Therefore, it is not suitable to utilize corona treatment in improving absorption for the higher density RSP. At the same time, with the variation of corona treatment time, the absorption of RSP surface changed irregularly because of the polarity of different test liquids. (3) The reasonable parameters of alkalization treatment and corona treatment are beneficial in improving the gluability of RSP. These results have guiding significance for RSP surface decoration process.

Mechanical Properties of Rice-Straw Reinforced PLA Composite after Alkalization, Heating and Coating Treatments

2021 ◽  
Vol 1030 ◽  
pp. 63-70
Author(s):  
Elammaran Jayamani ◽  
Chun Jie Yu ◽  
Hari Prashanth ◽  
Kok Heng Soon
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rice Straw ◽  
Alkali Treatment ◽  
Low Cost ◽  
Mechanical Tests ◽  
Interfacial Bonding ◽  
Treatment Needs ◽  
Coating Application ◽  
Cent Increase

Natural fibers have advantages over that of synthetic fibers such as biodegradability, low densities, and low cost of production. Optimum interfacial bonding is crucial since it determines the mechanical properties of a polymer-based composite materials. Surface treatment needs to be performed prior to the composites fabrication in order to improve the interfacial bonding. Coating application is an environmentally friendly alternative to the conventional methods of fiber treatments. In this research, the mechanical properties such as tensile (37.1 per cent increase), flexural strengths (61.7 per cent increase) and hardness (31.4 per cent less prone to surface indentation) of rice straw reinforced Polylactic acid composite at 10 wt% fiber and 90 wt% polymer after fiber treatments are analyzed through fabrication and testing. The fiber treatments involved are alkali treatment, heating treatment and coating. The results showed observable increase in tensile, flexural strengths and hardness for alkali treatment, heat treatment. However, from coating process, there is only slight increase in all the mechanical tests. These results have inferred that heat treatment has the highest improvement in mechanical properties, followed by alkalization and then comes coating.

Dynamic Wettability of Rice Straw

2010 ◽  
Vol 154-155 ◽  
pp. 1783-1787
Author(s):  
Bing Liu ◽  
Feng Hu Wang ◽  
An Ying Jiao ◽  
Jian Ping Sun ◽  
Meng Ying Zhen
Keyword(s):  
Contact Angle ◽  
Rice Straw ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Solvent Ratio ◽  
Surface Wetting ◽  
Change Rate ◽  
Wetting Properties ◽  
Angle Change ◽  
Test Concentration

With JC2000A Contact Angle Measuring Apparatus and established model of rice straw surface wetting, to improve the surface wetting properties of Rice Straw, effects of four kinds of alkali spray on Rice Straw at room temperature on contact angle was studied. The result shows that after alkali treatment the surface wettability of Rice Straw obtained significant improvement, contact angle decreases with the treatment time extended. The contact angle change rate reached the largest within 10min with the decreasing gradient of 20.64% when rice straw was dealt with NaNH2 at the mass fraction of 1%. Under the same conditions, rice straw processing with CaH2 has the minimum gradient contact angle change rate of 3.6%, A large number of Ca(OH)2 formation made The contact angle did not change significantly with time extended. Effect of NaOH treatment changed significantly over time, the optimum conditions of processing technology were obtained through orthogonal test: concentration of NaOH is 0.6%,solvent ratio 1:3.5 and reaction time 12h.

scholarly journals Investigation on the Preparation of Rice Straw-Derived Cellulose Acetate and Its Spinnability for Electrospinning

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3463
Author(s):  
Juntao Yan ◽  
Jinhong Liu ◽  
Ya Sun ◽  
Guangsen Song ◽  
Deng Ding ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Rice Straw ◽  
Food Packaging ◽  
Alkali Treatment ◽  
Xrd Analysis ◽  
Raw Material ◽  
Fibrous Membrane ◽  
Alkali Concentration ◽  
Bleaching Process ◽  
Autocatalytic Process

Rice straw-derived cellulose (RSC) with purity of 92 wt.% was successfully extracted from rice straw by a novel and facile strategy, which integrated the C2H5OH/H2O autocatalytic process, dilute alkali treatment and H2O2 bleaching process. Influencing factors of the cellulose extraction were systematically examined, such as ethanol concentration, alkali concentration, H2O2 bleaching process and so on; the optimal extraction conditions of cellulose was determined. A series of rice straw-derived cellulose acetate (RSCA) with different degree of substitution (DS) were prepared by the acetylation reaction; the effects of Ac2O/cellulose ratio, reaction temperature and reaction time on the acetylation reaction were investigated. Results of FTIR and XRD analysis demonstrated that highly purified RSC and RSCA were prepared comparing with the commercial cellulose and cellulose acetate. Solubility analysis of RSCA with different DS indicated as-prepared RSCA with DS of 2.82 possessed the best solubleness, which was suitable for electrospinning. Moreover, the flexible RSCA fibrous membrane was easily fabricated by a facile electrospinning method. Our proposed method provided a strategy for realizing the high-value utilization of waste rice straw resource, as prepared RSC and RSCA can be used as chemical raw material, and electrospun RSCA fibrous membrane has various applications in medical materials, food packaging, water purification and so on.

scholarly journals isolation of cellulose from agricultural waste using different treatments : A review

2021 ◽  
Vol 912 (1) ◽  
pp. 012020
Author(s):  
A Yustira ◽  
H Harahap ◽  
H Nasution ◽  
A Pranata
Keyword(s):  
Rice Straw ◽  
Plant Cell Wall ◽  
Alkali Treatment ◽  
Agricultural Waste ◽  
Industrial Sector ◽  
Waste Utilization ◽  
Agricultural Wastes ◽  
Valuable Product ◽  
Main Component ◽  
Better Than

Abstract Cellulose is one of the natural resources that are very abundant in nature. Cellulose is the main component in plant cell wall, so that abundant availability makes it potential to be used as a more valuable product. Cellulose can be obtained from agricultural wastes such as pea peels, rice straw, cucumber peels, eggplant stems, and coconut husks to produce cellulose. This cellulose has good biodegradability and biocompatibility so that it can be widely beneficial in the industrial sector. The product was obtained by a method developed for isolating cellulose by alkali treatment, acid hydrolysis, delignification process, and bleaching. The best cellulose from agricultural waste utilization is indicated by the crystallinity value in pea peels of 79% and yield of rice straw 90.28%, which is better than other agricultural wastes.

scholarly journals Pure Hydrolyzable Cellulose from Rice Straw, Wheat Straw and Sugarcane Bagasse by a Simple Scalable Two-Step Treatment

2021 ◽  
pp. 1-20
Author(s):  
Asodekar Bhupal Ravindra ◽  
Wadekar Prathamesh Chandrashekhar ◽  
Patil Parmeshwar Shivajirao ◽  
Patil Mallikarjun Laxmiputra ◽  
Lali Mallinath Arvind
Keyword(s):  
Wheat Straw ◽  
Rice Straw ◽  
Sugarcane Bagasse ◽  
Alkali Treatment ◽  
Cost Effective ◽  
Batch Process ◽  
Renewable Chemicals ◽  
Pure Cellulose ◽  
Biomass Components ◽  
Yield Formation

Utilization of amply available lignocellulosic biomass for a cost-effective conversion to renewable chemicals has proven more difficult than anticipated. Sustainable and viable fractionation of any biomass to its individual monomeric components for their further conversion to products at commercial scale therefore remains elusive. A rapid and scalable multi-step pretreatment strategy for fractionation of rice straw using a combination of dilute aqueous acid and aqueous alkali treatment steps under subcritical conditions was investigated. The process steps and parameters were optimized for yield and purity of the resulting biomass components. Effects of acid and alkali concentrations on the fractionation efficiency were studied in the range of 0.2% to 12% w/v at temperatures ranging from 110°C to 200°C for time spanning from 15 to 30 min. The simple optimum sequence of operations and conditions was found to be a diluteacid hydrolysis step at 130°C for 15 min with 2% HNO3 followed by the second treatment step at 130°C for 15 min with 2% NaOH. This combination gave 90% pure cellulose in more than 80% overall yield. Formation of furfurals in the hydrolysate was prevented significantly, and the cellulose obtained showed good amenability for enzymatic hydrolysis to sugars. The same process was applied to wheat straw and sugarcane bagasse, and the obtained results were found to be similar to those obtained for rice straw. The process was successfully scaled up to 50 L batch process with negligible deviations from smaller scale run results.

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