METHOD FOR PRODUCTION OF ESTERS OR CITRIC ACID IN THE PRESENCE OF THE ION EXCHANGERS

摘要

Method for production of esters of citric acid is characterised in that the esterification is carried out during distillation with catalytic effect of ion-exchange resin. In this invention, citric acid and ethanol are used as reactants, acid ion-exchange resin Ambrlite-120 with active sulphonic groups as a catalyst and three-ethyl-citrate is the obtained product. The advantage of this method compared to the existing patents as regards the production of three-ethyl-citrate, has the advantate of production at the atmospheric pressure at distillation with total reflux with commercially acceptable ion-exchange resin, and to obtain the increase in crops. This invention claims that by distillation in the presence of cationic ion exchangers, esterification process of citric acid with ethanol is speeded up, catalyst can be several times reused, high increase in crops are achieved, and the pure product of yellow light is obtained.;Postupak za dobijanje estara limunske kiseline naznaen time to se esterifikacija izvodi pri destilaciji uz katalitiko dejstvo jonoizmenjivake smole. U ovom pronalasku korieni su limunska kiselina i etanol kao reaktanti, kisela jonoizmenjivaka smola Ambrlite-120 sa aktivnim sulfonskim grupama kao katalizator i dobijen je proizvod tri-etil-citrat. Prednost ovog postupka u odnosu na prethodne patente, koji se odnose na dobijanje tri-etil-citrata, ima prednost izvodjenja na atmosferskom pritisku pri destilaciji uz totalni refluks sa komercijalno prihvatljivom jonoizmenjivakom smolom, i dobijanja veeg prinosa. Ovim pronalaskom utvrdjeno je da se destilacijom u prisustvu katjonskih menjaa jona, proces esterifikacije limunske kiseline sa etanolom ubrzava, katalizator se moe koristiti vie puta, postiu se veoma visoki prinosi proizvoda, i dobija se ist priozvod ukaste boje.[Method for production of esters of citric acid is characterised in that the esterification is carried out during distillation with catalytic effect of ion-exchange resin. In this invention, citric acid and ethanol are used as reactants, acid ion-exchange resin Ambrlite-120 with active sulphonic groups as a catalyst and three-ethyl-citrate is the obtained product. The advantage of this method compared to the existing patents as regards the production of three-ethyl-citrate, has the advantate of production at the atmospheric pressure at distillation with total reflux with commercially acceptable ion-exchange resin, and to obtain the increase in crops. This invention claims that by distillation in the presence of cationic ion exchangers, esterification process of citric acid with ethanol is speeded up, catalyst can be several times reused, high increase in crops are achieved, and the pure product of yellow light is obtained.