scholarly journals INFLUENCE OF THE FIBROUS MASS GRINDING METHOD ON THE PROCESS OF POWDER CELLULOSE PRODUCTION

2020 ◽  
Author(s):  
L.V. Yurtaeva ◽  
Yuri Alashkevich ◽  
N.S. Reshetova ◽  
Roman Marchenko
Keyword(s):  
Microcrystalline Cellulose ◽  
Experimental Studies ◽  
Cellulose Production ◽  
Powdered Cellulose ◽  
Cellulose Material ◽  
Grinding Method ◽  
Powder Cellulose ◽  
Disk Mill

The article presents results of experimental studies of cellulose properties depending on different shaped knife tooling of the disk mill used for grinding. A method for production of powdered cellulose material with characteristics close to microcrystalline cellulose is considered.

scholarly journals THE INFLUENCE OF THE KNIFE METHOD OF GRINDING PULP ON THE PROCESS OF OBTAINING POWDERED CELLULOSE

2020 ◽  
pp. 493-499
Author(s):  
Yuriy Davidovich Alashkevich ◽  
Larisa Vladimirovna Yurtaeva ◽  
Наталья Сергеевна Reshetova ◽  
Roman Aleksandrovich Marchenko
Keyword(s):  
Cellulose Fiber ◽  
Degree Of Polymerization ◽  
Water Retention Capacity ◽  
Technological Parameters ◽  
Retention Capacity ◽  
Powdered Cellulose ◽  
Cellulose Material ◽  
Powder Cellulose ◽  
Hydrolysis Process ◽  
Hardwood Pulp

This article presents the classification of the resulting types of powdered cellulosic materials, their scope, as well as the problems arising during production. The main properties of powder cellulose materials are considered. Analyzed the quality indicators of the pulp, previously ground in a disc mill. The main technological parameters of the experimental setup and the comparative characteristics of the used knife grinding sets are presented. In the course of the experimental research, knife grinding sets with straight and curved knives were used. The data obtained confirmed the previously put forward hypothesis about the predominant fibrillation of cellulose fiber milled using a grinding set with a curved blade shape. This feature of the headset design is especially important when grinding hardwood pulp, which has a lower initial value, compared to softwood pulp. The data obtained in determining the degree of grinding, water retention capacity, fiber length of softwood and hardwood cellulose after knife grinding and the degree of polymerization after hydrolysis are presented. A method for producing powdered cellulose material with characteristics similar to microcrystalline cellulose is considered. The regulated parameters of the hydrolysis process are set and a comparison is made of the degree of polymerization of the considered samples of powdered cellulose.

scholarly journals "PALLADIUM ON COAL" CATALYST OBTAINED BY PYROLYSIS OF POWDER CELLULOSE GRANULES IM-PREGNATED WITH PALLADIUM NITRATE

2021 ◽  
pp. 333-342
Author(s):  
Andrey Borisovich Shishmakov ◽  
Yuliya Vladimirovna Mikushina ◽  
Ol'ga Vasil'yevna Koryakova
Keyword(s):  
Palladium Catalysts ◽  
Total Porosity ◽  
Carbon Matrix ◽  
Ash Content ◽  
Spherical Particles ◽  
Powdered Cellulose ◽  
Powder Cellulose ◽  
Palladium Nitrate ◽  
Water Seal ◽  
Pyrolysis Gases

By pyrolysis of powdered cellulose granules impregnated with palladium nitrate, catalysts of 1–8% Pd / C were obtained. Pyrolysis was carried out in a reactor with a water seal at 600 ° C. Metal reduction was carried out with pyrolysis gases and matrix carbon. It was found that the ash content of powdered cellulose granules is ~ 40 times less than the ash content of sulfate cellulose, from which they were made. It was shown by X-ray phase analysis and electron microscopy that palladium in the catalysts is present in the form of Pd (0) nanoparticles uniformly covering carbon fibers and shapeless massive metal precipitates up to 20 μm in diameter. In catalysts 1–3% Pd / С, nanoparticles 10–40 nm dominate (> 95%), in 8% Pd / С, 20–70 nm. The share of massive metal formations in Pd (1%) / C, Pd (3%) / C and Pd (8%) / C is: ~ 2%, ~ 5% and ~ 60%, respectively. They consist of aggregated spherical particles 0.05–0.15 µm in diameter. XRD palladium oxide was not detected in the catalysts. The presence of palladium nitrate in powdered cellulose during its carbonization has a significant effect on the formation of the carbon matrix. With an increase in the content of palladium nitrate in powdered cellulose, the yield of carbon material decreases and its total porosity increases. Infrared spectroscopy revealed the presence of oxygen-containing ether groups in the carbon matrix of palladium catalysts. The activity of catalysts in the model process of decomposition of hydrogen peroxide increases with increasing dispersion of palladium nanoparticles.

Optimizing Single-Stage Processes of Microcrystalline Cellulose Production via the Peroxide Delignification of Wood in the Presence of a Titania Catalyst

2018 ◽  
Vol 10 (4) ◽  
pp. 360-367 ◽  
Author(s):  
B. N. Kuznetsov ◽  
I. G. Sudakova ◽  
O. V. Yatsenkova ◽  
N. V. Garyntseva ◽  
F. Rataboul ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Single Stage ◽  
Cellulose Production ◽  
Peroxide Delignification

scholarly journals Isolation and Phisicochemical Characterization of Microcristalline Cellulose from Ramie (Boehmeria nivea L. Gaud) Based on Pharmaceutical Grade Quality

2018 ◽  
Vol 5 (2) ◽  
pp. 55
Author(s):  
Desy Nawangsari ◽  
Anis Yohana Chaerunisaa ◽  
Marline Abdassah ◽  
Sriwidodo Sriwidodo ◽  
Taofik Rusdiana ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Research Method ◽  
Physicochemical Characterization ◽  
Cellulose Production ◽  
Hemp Fiber ◽  
Pharmaceutical Excipient ◽  
Cellulose Yield ◽  
Boehmeria Nivea

Microcrystalline cellulose is the most used material for medicine, which able to be found in fibrous plants. Microcrystal celluloses are being used as filler or binder in dosage formulas in tablets and capsules. This research aimed to produce microcrystalline cellulose from ramie based on pharmaceutical grade parameters. Research method include hemp fiber preparation, α-cellulose isolation, microcrystalline cellulose production, and microcrystalline cellulose characterization which compare with Avicel® PH 102 . Result shown microcrystalline cellulose yield is 57.26%. The result of physicochemical characterization that can comply the specifications of pharmaceutical grade as a pharmaceutical excipient.  Keywods :  Microcrystalline cellulose, Ramie, physicochemical, pharmaceutical grade.

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