Glycerol chlorination in a gas-liquid semibatch reactor: New catalysts for chlorohydrin production

摘要

Glycerolfrombiodieselproductioncanbeanimportantindustrialfeedstockforchemicalcommodi???udtiesasitcanbeusedinthefood,cosmetic,pharmaceuticalandtobaccoindustries.However,crudeudglycerolderivedfrombiodieselproductionhasalowvaluebecauseofimpurities.Thepurificationofudthis glycerolinto a high gradeinvolves high costs andis noteconomically feasible for small andudmediumsizeplants.Theglycerolconversionintochlorohydrinswasstudiedusingnewhomogene???udouscatalystsandhydrochloricacidaschlorinationagent.Thisisaninterestingalternativeroutetoudepichlorohydrinandthentoepoxyresins.Thebehavioroftwoseriesofhomologouscatalysts,gly???udcolicacidseries (glycolicacid,di???glycolicacidand thio???glycolicacid)andamminoacidseries (glu???udtamicacid,asparticacidandcysteine),wereinvestigated fortheiractivityandselectivity.Glycolicudacids were more active than amminoacids. The pKa values had a strong influence on selectivityud(mono???chlorohydrins/di???chlorohydrins)fortheamminoacidseries,whichwasnotobservedfortheudglycolicacids.Akineticmodelandreactionmechanismdevelopedinapreviousworkwereusedforudinterpretingthekineticruns