PROCESS FOR PREPARING FUMARIC-ACID ESTERS USING ALCOHOLS C4-C8

The invention relates to a process for preparing the fumaric-acid esters using alcohols C4-C8, consisting of the esterification of the fumaric acid, as a by-product, using alcohols C4-C8 in fused-mass, in the presence of acid catalysts selected from among phenyl-sulphonic acid, paratoluene-sulphonic...

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Hauptverfasser: MODRA DORINA, MĂTIEŞ MARIUS ILIE, FARCAŞ MARIA, LUCACIU NICOLAE IVAN
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a process for preparing the fumaric-acid esters using alcohols C4-C8, consisting of the esterification of the fumaric acid, as a by-product, using alcohols C4-C8 in fused-mass, in the presence of acid catalysts selected from among phenyl-sulphonic acid, paratoluene-sulphonic acid, meta-sulphonic acid, etc., at a molar ratio fumaric acid : alcohols of 1/2.2...1/3.3, while removing the water by packed-column distillation, at the atmospheric pressure, while removing the excess alcohol by vacuum devolatilization. Invenţia se referă la un procedeu de obţinere a esterilor acidului fumaric cu alcooli C- C, care constă în esterificarea acidului fumaric, rezultat ca produs secundar, cu alcooli C- Cîn topitură, în prezenţă de catalizatori acizi, aleşi dintre acid benzensulfonic, paratoluensulfonic, metasulfonic etc., la un raport molar acid fumaric: alcooli de 1/ 2,2...1/ 3,3, cu eliminarea apei prin distilare pe coloană cu umplutură, la presiune atmosferică, cu îndepărtarea alcoolului în exces prin devolatilizare sub vid.