BROMINATION OF PHTHALATE-CONTAINING SYSTEMS OBTAINED FROM INDUSTRIAL WASTE
Abstract
The possibility of bromination with molecular bromine of a mixture of phthalates obtained from waste products of butyl alcohols by oxosynthesis is considered. The features of the process in glacial acetic acid, carbon tetrachloride, isopropyl alcohol, water, without the use of a solvent are studied. A decrease in the rate of bromine addition with an increase in the permittivity of the reaction medium, as well as the occurrence of substitution reactions in the aliphatic radical and the benzene ring of the system under study, was noted. The preference of bromination of the object of study in media with low dielectric permittivity is shown. A regression equation is obtained that takes into account the influence of temperature, the rate of bromine introduction, the nature of the solvent, the excess of bromine on the response functions: the degree of bromination, the acid number. Its validity and practical significance are proved. The linear dependence of the degree of bromination on the dielectric permeability of the medium is established. The optimal conditions for the addition of bromine by the double bonds of unsaturated radicals of the studied phthalates are determined, providing the maximum degree of bromination and the minimum acidity of the system. The sequence of technological operations of the process of obtaining a modified phthalate-containing system is proposed: preparation of raw materials, bromination with free bromine, neutralization of excess bromine, vacuum distillation of traces of moisture from neutralization products, filtration of the final product.
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