New methods of acid hydrolysis of cellulose and plant raw materials

Prospects for the development of hydrolysis production are determined by the relevance of industrial use of plant biomass to replace the declining reserves of fossil organic raw materials and increasing demand for ethanol, especially for its use as automobile fuel, protein-containing feed additives that compensate for protein deficiency in feed production, and other products. Based on the review of the research results presented in the scientific literature, the analysis of modern methods of liquid-phase acid hydrolysis of cellulose and various types of plant raw materials, including those that differ from traditional ones, is performed. The main directions of increasing its efficiency through the use of new catalytic systems and process conditions are identified. It is shown that the most promising methods for obtaining monosaccharides in hydrolytic processing of cellulose and microcrystalline cellulose, pentosan-containing agricultural waste and wood, are methods for carrying out the process at elevated and supercritical temperatures (high-temperature hydrolysis), the use of new types of solid-acid catalysts and ionic liquids.

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Stochastic modelling of cellulose hydrolysis with Gauss and Weibull distributed transition probabilities

Scientific Reports ◽

10.1038/s41598-021-88873-6 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Joseph Mcgreg Duru ◽

Oana Cristina Pârvulescu ◽

Tănase Dobre ◽

Cristian Eugen Răducanu

Keyword(s):

Acid Hydrolysis ◽

Stochastic Models ◽

Transition Probabilities ◽

Stochastic Modelling ◽

Cellulose Hydrolysis ◽

Process Conditions ◽

Hydrolysis Of Cellulose ◽

Model Equations ◽

Kinetics Of ◽

Hydrolysis Of

AbstractTwo Markov-type stochastic models were developed to describe the kinetics of acid hydrolysis of cellulose. One of them involved a Gauss (normal) distribution of probabilities of chemical bond breaking, the other a Weibull distribution. It was considered that the random breaking of cellulose was based on the cleavage of a parent macromolecule into two descendants. Model equations and kinetics of acid hydrolysis of cellulose consisting of 10 and 100 units of cellobiose were presented. The effects of acid concentration and temperature on the kinetics of hydrolysis process were taken into account. The results obtained applying both stochastic models were in a reasonable agreement with those obtained using a deterministic kinetic model. These stochastic models can accurately describe the kinetics of acid hydrolysis and cover the drawbacks of some deterministic kinetic models, e.g., large number of model equations and parameters, modification of parameter values by changing the process conditions.

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Enzymatic hydrolysis of plant raw materials: state and prospects

Proceedings of the National Academy of Sciences of Belarus Chemical Series ◽

10.29235/1561-8331-2021-57-4-502-512 ◽

2021 ◽

Vol 57 (4) ◽

pp. 502-512

Author(s):

V. S. Boltovsky

Keyword(s):

Enzymatic Hydrolysis ◽

Plant Biomass ◽

Raw Materials ◽

Raw Material ◽

Theoretical Concepts ◽

Industrial Processing ◽

Plant Raw Materials ◽

Highly Active ◽

State Of Research ◽

Hydrolysis Of

Plant raw materials are practically an inexhaustible natural resource, since they are constantly renewed in the process of plant photosynthesis, which determines the prospects for their use for industrial processing in various ways, including hydrolytic. The main biopolymer components of plant biomass in terms of their quantitative content are polysaccharides, the hydrolytic processing of which by acidic or enzymatic hydrolysis leads to the formation of monosaccharides and various products obtained from them. This review of scientific literature analyzes theoretical concepts and the current state of research on the development, improvement and prospects for the use of enzymatic hydrolysis of plant raw materials. The efficiency of this process and the composition of the resulting products largely depend on the features of the supramolecular structure of cellulose, the content of hemicelluloses and lignin in the raw material, the balance and activity of the cellulase complex of enzymes. It is shown that the main directions of development and improvement of the processes of enzymatic hydrolysis of plant raw materials at present are the production and use of more effective strains of microorganisms that produce highly active enzymes, the directed creation of complex enzymes (hydrolyzing not only cellulose, but also hemicellulose, as well as destroying lignin), the development of methods for pretreatment of raw materials to increase the reactivity of cellulose and remove lignin and improve the processes of fermentolysis.

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