Barbash V.A.

Influence of Bast Fibers Treatment Stages on Microcrystalline Cellulose Indices

The process of obtaining microcrystalline cellulose from non-wood plant bast fibers (flax, hemp, kenaf) with using preliminary acid hydrolysis, alkaline sulfite -alcohol method delignification and oxidation-organosolvent processing was investigated. It is established that the conduct preliminary acid hydrolysis in the first step of obtaining microcrystalline cellulose can significantly reduce the mineral content (at 62–75 %), partly yield of pulp (at 9–12 %) and residual lignin content (at 20–30 %) compared of feedstock.

Obtaining of straw pulps by peracetic pulping method of delignification

The paper studies the influence of the basic technological parameters of obtaining straw fibrous semifinished products by the peracetic method of delignification. Using the method of full factorial experiment, we obtain the regression equations of producing straw fibrous semi-finished products. Furthermore, we determine main kinetic characteristics of the delignification process of wheat straw

Influence of Amphoterous Polymer Resin on Indexes of Dehydration of Pulp and Paper Quality

Influence of amphoterous polymer resin “Ultrares 200” on forming process and strength properties of paper from wastepaper was investigated. It was established, that increasing of beating rate of pulp leads to decreasing of pulp dehydration rate. It was concluded, that grinding shortens and partially fibrillates fiber, increasing their surface leading to better swelling and retention of water by fibers.

Investigation of Various Stages Process for Producing Microcrystalline Pulp from Hemp for its Quality Indicators

A comparative analysis of the chemical composition of the hemp fibers and stalks with cotton and representatives of hardwood and softwood was performed. The possibility of obtaining microcrystalline cellulose from hemp fibers by alkaline sulfite-alcohol delignification with preliminary acid and alkaline hydrolysis was investigated. It was found that carrying out an acid and an alkali pre-hydrolysis reduces the mineral content and partly of residual lignin in the plant material.

Microcrystalline Cellulose from Bast Plants

It was found that the chemical composition of flax fiber is common to cotton fiber, but differs from the stems of hemp and kenaf, softwood and hardwood because of higher content of ash, lesser lignin and pentosans content. Stems of hemp and kenaf compared with wood at approximately the same cellulose content have lesser lignin content, ash content and a much larger number of substances that dissolve in water and NaOH.

Resource Recycling Technologies Stems Miscanthus

Processes of obtaining pulp from Miscanthus stems for the production of paper and cardboard, microcrystalline cellulose and pellets were investigated. The chemical composition of Miscanthus giganteus stems was determinated. Established that the Miscanthus contains more cellulose, pentosans, minerals and less lignin than wood. The influence of main technological parameters on the quality indexes of organosolv pulp obtained from Miscanthus stems was investigated. The use of miscanthus organosolv pulp in composition of writing paper and paperboard container was experimentally confirmed.

Solvent Delignification of Kenaf and Sugar Sorghumstems

The chemical composition of stalks of kenaf and sugar sorghum was studied. Established that the kenaf and sugar sorghumstalks contain more cellulose, pentosans, minerals and less lignin than wood. The influence of main technological parameters on the quality indexes of organosolvent pulp obtained from kenaf and sugar sorghum stems was investigated. The possibility of bleaching organosolvent pulp obtained from stems of kenaf using hydrogen peroxide without chlorinecompounds to 80 % whiteness was experimentally proved.

Rationale Method of Holocellulose Contents Determination in Non-Wood Plant Materials

Method of determination of holocellulose contents in non-wood plant raw materials with taking into account the peculiarities of their anatomical structure and chemical composition was proposed. It was shown that the sustainable level of concentration peracetic acid and hydrogen peroxide determined after seven days of saturation of the solution. The dependences of the holocellulose contents on the duration of treatment different representatives of annual plants were established.

Substantiation of Processes Efficiency Methodology Assessment of Plant Material Delignification

The paper develops the methodology for determining the most efficient processes delignification of plant material to obtain pulps, suitable for use in various industries. Experimental data and calculated characteristics of obtained pulps from one representative non-wood plant raw material – wheat straw by different methods of delignification: soda, neutral sulphite, bisulphite, acetic, ester, ammonia-sulphite-alcohol, two-stage alcoholic alkali, peracetic, alkaline-sulphite-alcohol.

Substantiation of Processes Efficiency Methodology Assessment of Plant Material Delignification

The paper analyzes the consumption and production of paper and cardboard during the years of Ukrainian independence. We summarize the experimental data for obtaining laboratory samples of cardboard and paper products with using its fiber composition of pulp from non-wood plant materials. It is shown that to increase the consumption of paper and paperboard per capita to expand the capacity of enterprises to obtain pulp from various sources of plant material, particularly from non-wood plant materials.