Abstract
The possibility of using the cation-exchange resin Lewatit K2420 as a catalyst for the synthesis of 1,3-butadiene from isopropyl alcohol and formaldehyde solution in one technological stage has been shown. The regularities of the process have been established and the influence of the formaldehyde form (a cyclic trimer 1,3,5-trioxane and a 37% solution in water) on the composition of the reaction mass and the yield of the main and by-products has been assessed. It has been shown that the Lewatit K2420 heterogeneous catalyst showed catalytic activity in all reactions occurring in the synthesis of 1,3-butadiene, including the decomposition of 1,3,5-trioxane, dehydration of isopropyl alcohol into propylene, condensation of propylene and formaldehyde, dehydration of 3-butene-1-ol, decomposition of 4-methyl-1,3-dioxane, etc.
Highlights
Among the processes based on the acid-catalyzed interaction of formaldehyde (FA) with iso-olefins the synthesis of isoprene from FA and isobutylene could be named, which is one of the main methods of isoprene production in Russia
For acidic catalysts, such alternative is cation-exchange resins that meet all the requirements for catalytic systems, while having a number of advantages over homogeneous catalysts, such as low corrosion activity towards equipment, no need to neutralize the catalyst after the synthesis completion, the possibility of multiple use of the catalyst without a significant decrease in its catalytic activity
The relevance of the development of a new energyefficient, sophisticated process based on the use of modern achievements of chemical science and technology, led us to study the regularities of BD synthesis from isopropyl alcohol (IPA) and FA in the presence of cation-exchange resins (CER) – heterogeneous acid catalysts that allow reactions to proceed under mild conditions and are not corrosive
Summary
Among the processes based on the acid-catalyzed interaction of formaldehyde (FA) with iso-olefins the synthesis of isoprene from FA and isobutylene could be named, which is one of the main methods of isoprene production in Russia. The current trend in improving the chemical technology processes is the replacement of homogeneous catalysts with heterogeneous ones For acidic catalysts, such alternative is cation-exchange resins that meet all the requirements for catalytic systems (high activity, selectivity, dynamic stability and lifetime), while having a number of advantages over homogeneous catalysts, such as low corrosion activity towards equipment, no need to neutralize the catalyst after the synthesis completion, the possibility of multiple use of the catalyst without a significant decrease in its catalytic activity. The relevance of the development of a new energyefficient, sophisticated process based on the use of modern achievements of chemical science and technology, led us to study the regularities of BD synthesis from isopropyl alcohol (IPA) (propylene) and FA in the presence of CER – heterogeneous acid catalysts that allow reactions to proceed under mild conditions and are not corrosive
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