scholarly journals Effects of acid hydrolysis waste liquid recycle on preparation of microcrystalline cellulose

2019 ◽  
Vol 8 (1) ◽  
pp. 348-354 ◽  
Author(s):  
Huijuan Xiu ◽  
Rui Cheng ◽  
Jinbao Li ◽  
Feiyan Ma ◽  
Te Song ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Metal Accumulation ◽  
Cost Effective ◽  
Waste Recycling ◽  
Reducing Sugar ◽  
Amorphous Cellulose ◽  
Successful Attempt ◽  
The Impact ◽  
Hydrolysis Of

Abstract Large amounts of acidic waste are produced on the industrial scale during hydrolysis of partially amorphous cellulose to produce microcrystalline cellulose (MCC). The essential disposal and treatment of this highly acidic liquid wastes the acid feedstock and increases the production cost. To maximize the use of acid without sacrificing the MCC product quality, this project reports a successful attempt to recycle the acid hydrolysis waste liquid, focusing on the impact of waste recycling on MCC morphology and reducing sugar in the hydrolysate. The results showed that when the waste liquid is recycled 1-5 times, no metal accumulation occurred while cellulose particles remained intact, maintaining their shape and size. Their extent of crystallinity remained nearly constant, even increasing slightly with up to three cycles. The concentration of reducing sugar showed growth when recycling the waste liquid up to three times, although not quite to the levels that would allow for its cost-effective fermentation. The acid amount to be added at the start of each cycle was near 50% of that used on the first stage.

The Formation of Plasma Acid at Atmospheric Pressure and its Application in Hydrolysis of Microcrystalline Cellulose

2013 ◽  
Vol 750-752 ◽  
pp. 1626-1629
Author(s):  
Bo Yuan ◽  
Ying Wang ◽  
Ying Chao Ji ◽  
Qiu Hong Wang
Keyword(s):  
Microcrystalline Cellulose ◽  
Atmospheric Pressure ◽  
High Performance ◽  
Barrier Discharge ◽  
Ph Value ◽  
Reducing Sugar ◽  
Dielectric Barrier ◽  
Integrated Optical ◽  
Hydrolysis Of ◽  
Single Factor Experiment

In this paper, plasma acid was obtained by treating distilled water with dielectric barrier discharge at atmospheric pressure in order to hydrolyze cellulose. The acidity of plasma acid was studied through a single factor experiment. A plasma acid with pH value of 1.42 was obtained and used to hydrolyze microcrystalline cellulose at 80°C for 60min. Under this condition, the integrated optical density (IOD) of the hydrolysis sample was 0.589. Based on standard glucose curve, the total reducing sugar (TRS) was calculated to be 53.75mg and the TRS yield was 53.75%. The filtrate was evaporated to get the solid hydrolysis sample to be analyzed by High-performance liquid chromatography (HPLC). The results showed that the sample mainly consisted of glucose, which proved that microcrystalline cellulose could be hydrolyzed by plasma acid. Therefore, it could be concluded that it was an environmentally friendly and economical method to hydrolyze the microcrystalline cellulose by plasma acid.

Efficient Hydrolytic Breakage of β-1,4-Glycosidic Bond Catalyzed by a Difunctional Magnetic Nanocatalyst

2018 ◽  
Vol 71 (8) ◽  
pp. 559 ◽  
Author(s):  
Ren-Qiang Yang ◽  
Ni Zhang ◽  
Xiang-Guang Meng ◽  
Xiao-Hong Liao ◽  
Lu Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Microcrystalline Cellulose ◽  
Significant Loss ◽  
Reducing Sugar ◽  
Magnetic Nanocatalyst ◽  
Efficient Catalyst ◽  
Glycosidic Bonds ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

A novel difunctional magnetic nanocatalyst (DMNC) was prepared and used to catalyse the hydrolytic breakage of β-1,4-glycosidic bonds. The functional nanoparticle displayed excellent catalytic activity for hydrolysis of cellobiose to glucose under moderate conditions. The conversion of cellobiose and yield of glucose could reach 95.3 and 91.1 %, respectively, for a reaction time of 6 h at pH 4.0 and 130°C. DMNC was also an efficient catalyst for the hydrolysis of cellulose: 53.9 % microcrystalline cellulose was hydrolyzed, and 45.7 % reducing sugar was obtained at pH 4.0 and 130°C after 10 h. The magnetic catalyst could be recycled and reused five times without significant loss of catalytic activity.

scholarly journals Zhurkov’s Stress-Driven Fracture as a Driving Force of the Microcrystalline Cellulose Formation

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2952
Author(s):  
Sergey V. Stovbun ◽  
Mariya G. Mikhaleva ◽  
Aleksey A. Skoblin ◽  
Sergey V. Usachev ◽  
Sergey N. Nikolsky ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Driving Force ◽  
Food Industry ◽  
Thermal Destruction ◽  
Chemical Conversion ◽  
Cellulose Fibers ◽  
Point Of View ◽  
Pure Product ◽  
Hydrolysis Of

Microcrystalline cellulose (MCC) is a chemically pure product of cellulose mechano-chemical conversion. It is a white powder composed of the short fragments of the plant cells widely used in the modern food industry and pharmaceutics. The acid hydrolysis of the bleached lignin-free cellulose raw is the main and necessary stage of MCC production. For this reason, the acid hydrolysis is generally accepted to be the driving force of the fragmentation of the initial cellulose fibers into MCC particles. However, the low sensibility of the MCC properties to repeating the hydrolysis forces doubting this point of view. The sharp, cleave-looking edges of the MCC particles suggesting the initial cellulose fibers were fractured; hence the hydrolysis made them brittle. Zhurkov showed that mechanical stress decreases the activation energy of the polymer fracture, which correlates with the elevated enthalpy of the MCC thermal destruction compared to the initial cellulose.

Influence of Deacidification on Arylmethane Dyes on Paper

2015 ◽  
Vol 36 (3) ◽  
Author(s):  
Viera Jančovičová ◽  
Eva Belányiová ◽  
Zuzana Machatová ◽  
Bohuslava Havlínová
Keyword(s):  
Relative Humidity ◽  
Acid Hydrolysis ◽  
Aqueous Extract ◽  
Mass Scale ◽  
Accelerated Ageing ◽  
Colour Difference ◽  
Historic Paper ◽  
The Stability ◽  
The Impact ◽  
Hydrolysis Of

AbstractThe deacidification of historic paper objects has evolved into a method that is applied in mass-scale in some archives and libraries. While the impact of the deacidification reagents on paper is quite well researched, knowledge about the behavior of colours and dyes is more limited. Our study focused on the influence of paper deacidification by the Book Saver® process on eight different dyes applied on paper, as well as on the paper support itself. Accelerated ageing in moist and warm conditions (80°C, 65% relative humidity) was applied to investigate the stability of the dye layer on top of the paper, with respect to their chemical, optical and spectroscopic attributes. The Book® deacidification process increased the pH of the aqueous extract and an alkaline reserve was created. FTIR spectroscopic measurements showed that deacidification suppresses acid hydrolysis of paper. The variations in UV-Vis reflectance spectra and in total colour difference of the dye layer evidenced the changes in the structure of dyes caused by accelerated ageing, but the extent of the changes differs depending on the dye. We can conclude that some dyes are more prone to changes by deacidification than others.

scholarly journals Analysis on Impact of Acid Hydrolysis on the Hydrogen Bonding Network in Cellulose to Obtain Microcrystalline Cellulose: A Statistical Approach

2021 ◽  
Author(s):  
Vishnu Prabha Muthusamy ◽  
Vaideki Krishnakumar
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Cellulose Microfibrils ◽  
Degree Of Crystallinity ◽  
Electron Microscopic ◽  
X Ray ◽  
Hydrogen Bonding Network ◽  
Hydrolysis Of

Abstract Hydrolysis of a cellulose biomass results in breaking down the cellulose microfibrils into microcrystalline cellulose (MCC) or nanocrystalline cellulose (NCC) depending on the reaction conditions. Cellulose microfibrils are established robustly due to the synergistic interaction of van der Waals, inter- and intra-molecular hydrogen bonds and glycosidic bond between glucan moieties of cellulose polysaccharide. The hydrogen bonding network plays a crucial role in conforming cellulose chains into crystalline and amorphous region thereby determining its degree of crystallinity. The knowledge of hydrogen bonds in cellulose hence becomes indispensable to understand the crystallinity of cellulose before and after a hydrolysis reaction. However, the nature of hydrogen bonds after hydrolysis and how they contribute to the mechanical properties of resultant MCC/NCC are yet to be realized. This paper is therefore intended to discuss the degree of crystallinity of cellulose particles obtained after hydrolyzing waste cotton fibers (WCF) in two parts: part I, obtaining MCC with maximum total crystallinity index (TCI) by acid hydrolysis of WCF using Box Behnken Design; part II, comparing degree of crystallinity of MCC sample exhibiting highest TCI with that of WCF using analytical tools like X-ray Photoelectron Spectrometer, X-ray Diffractometer and Fourier Transform Infra- Red spectrometer. The physical dimension of MCC particle with maximum TCI has been verified using Field Emission Scanning Electron Microscopic images.

scholarly journals Estimation of Reducing Sugar by Acid Hydrolysis of Sunflower (<i>Helianthus annuus</i>) Husk by Standard Methods

2016 ◽  
Vol 07 (05) ◽  
pp. 322-325
Author(s):  
Siddegowda Chandraju ◽  
Rachnayak Venkatesh ◽  
Chandraju Sadolalu Chidan Kumar ◽  
Basavaraju Ajay Kumar
Keyword(s):  
Acid Hydrolysis ◽  
Helianthus Annuus ◽  
Reducing Sugar ◽  
Standard Methods ◽  
Hydrolysis Of

Acid Hydrolysis from Corn Stover for Reducing Sugar

2014 ◽  
Vol 931-932 ◽  
pp. 1608-1613 ◽  
Author(s):  
Jintara Satarn ◽  
Wimonporn Lamamorphanth ◽  
Khanita Kamwilaisak
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Acid Hydrolysis ◽  
Corn Stover ◽  
Reaction Times ◽  
Reducing Sugar ◽  
Optimal Conditions ◽  
Treated Sample ◽  
Hydrolysis Of ◽  
Scanning Electron

The aim of this study is to extract the reducing sugar by acid hydrolysis of corn stover. The corn stover was hydrolyzed by using H2SO4 at different concentrations (0-6%, v/v),reaction times (15-180 min) at temperature 122 C with ratio of 1 g of corn stover to 20 ml of H2SO4 solution. The samples were analyzed the reducing sugar by HPLC. The optimal conditions of acid hydrolysis was at 1% H2SO4 (v/v), 122 C for 60 min, which produced 24.96 g/L of reducing sugar. The hydrolysed sample composed of 12.4 g/L of xylose, 2.9 g/l of glucose and 3.2 g/L of arabinose. Also, the Scanning Electron Microscopy (SEM) was analyzed the morphology of untreated and treated corn stover which showed the breakdown fibril of treated sample.

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