CREATION OF SMART FILMS FOR PACKAGING BASED ON WASTE FROM THE PROCESSING INDUSTRY
The kraft process is one of the most common methods of pulp and paper processes. It includes a delignification process, which involves treating wood with alkali and sodium sulfide at high temperatures. The black liquor generated in the process is a toxic waste rich in phenylpropane units. Given the scale of the pulp and paper industry, the creation of methods for converting waste into raw materials for other production is becoming an urgent task for modern science. We offer a highly efficient and atom-economical approach to black liquor modification, which involves further use and polymerization to produce smart films. The product of alkaline hydrolysis of 7-hydroxy-mataresinol was used as a model compound. This is the first mild method for alpha-alkylation of carboxylic acids without the use of organoelements and catalysts. This reaction is made possible by a unique mechanism involving O-allylation and sigmatropic rearrangement. The target compound can be obtained with a yield of up to 40%. We have also determined the limits of the method applicability and the possibility of obtaining a by-product with a maximum yield of 7%. The structure of all the compounds obtained was proved using modern methods of nuclear magnetic resonance. Thus, in this article, we not only propose a new method for modifying black liquor, but also explain the mechanism of the organic reaction, and describe the further stages of converting toxic waste into packaging material.