The feedstock chemical composition (wood pine), cellolignin and hydrolyzate obtained with alcohol boiling
Recently, the development of hydrolysis industries and the stable operation of a number of operating enterprises are primarily limited by environmental factors, the importance of which have long been underestimated. In order to have a cardinal solution of the environmental protection problem, it is necessary to use ecologically optimal technology in hydrolysis and alcohol production, which does not disturb the self-regulation process of natural complexes. The technical ethanol production with wood raw materials is accompanied by the large-tonnage waste formation - the so- called post-alcohol distillery waste, which is much greater than the main product yield. It may reach 135-150 m3 per 10 m3 of ethanol. From our point of view, the most optimal solution of post-alcohol distillery waste utilization is to use plant raw materials in the main production, particularly in cooking acid production process. The paper contains data of raw material chemical composition (wood pine), cellolignin and hydrolyzate obtained with alcohol production. It is found out in researching the raw material chemical composition that the pine wood contains: cellulose - 42.6%, easily hydrolysable polysaccharides (EHP) - 17.2% and lignin - 20.4%. The reducing substance concentration in the hydrolyzate is 3.1%, dry matter 3.5%, organic acids in terms of acetic acid 0.54%, oligosaccharides 0.34%, furfural 0.12%, hydrolyzate pH 1,2. The hydrolyzate adequate quality is 88%. In studying the cellulignin chemical composition, it is found out that in the process of boiling all the EHP and some 45% hardly hydrolysable polysaccharides (HHP) of the wood are transferred to into the solution. Thus, in studying the chemical feedstock, cellolignin and hydrolyzate composition, it is found out that: the 20% HHP presence in cellolignin indicates an insufficiently optimal mode of plant material hydrolysis; the hydrolyzate good quality meets the requirements for hydrolysates in alcohol production; it is foreseen to use post-alcohol distillery waste for cooking acid preparation in the proposed technology.