Ethylenediamine in alkaline cooking of jute stick for producing dissolving pulp

Abstract

Jute stick is the woody portion of jute plant. It remains as the leftover after extracting the fibre. The ratio of the stick to fibre is about 2.5:1. For producing dissolving pulp, prehydrolysis is carried out prior to pulping to remove hemicelluloses from the lignocelluloses. In this investigation ethylenediamine (EDA) was used with the cooking liquor to remove hemicelluloses from the jute stick. Increasing EDA charge in soda and kraft liquor decreased pentosans content in the pulp. EDA in kraft liquor showed lower kappa number and pentosans content than in the soda-liquor. Prehydrolysis further improved cellulose content and kappa number of jute stick pulp with the sacrifice of pulp yield. The bleachability of soda-EDA pulp was inferoior to the kraft-EDA and prehydrolysed soda-EDA in ECF bleaching sequences. The final brightness of soda-EDA pulp was 85.1% and kraft-EDA pulp 89.7%. Degraded cellulose (R 18 -R 10 ) in soda-EDA and kraft-EDA pulps was lower than prehydrolysed pulps. Dissolving pulp can be produced to 93% purity without prehydrolysis by reinforcing EDA in kraft liquor.

Isolation and comparative study of various polymorphic forms of inulin

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Study on the microcrystalline cellulose from medicinal plants

“…The development strategy of New Uzbekistan identified important tasks of "raising the industry to a new level of quality, deep processing of local raw materials, accelerating the production of finished products, mastering new types of products and technologies". In this regard, it is of great importance to optimize technologies with the introduction of low-stage, continuous processes using local reagents, which makes it possible to reduce energy and capital costs in the production of microcrystalline cellulose obtained from waste (meal) from the processing of cotton, wood and partially medicinal plants, which is used in as a filler in the preparation of drugs, as a sorbent in analytical and preparative chromatography, as an additive in confectionery, bread and meat products in the food industry [10][11][12][13][14]. Currently, research is being carried out on the production of microcrystalline and nanocrystalline cellulose from both cotton, wood, and non-wood plant materials [15][16][17].…”