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Study On Synthesis Of Non-toxic Plasticizer Tributyl Citrate And Tributyl Acetylcitrate

Posted on:2010-05-09Degree:MasterType:Thesis
Country:ChinaCandidate:M WeiFull Text:PDF
GTID:2121360278975403Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
The technical condition of synthesis tributyl citrate by citric acid and butanol was studied with Ce(SO4)2·4H2O/NH2SO3H as catalyst. Acetyl tributyl citrate(ATBC) was synthesized using TBC and acetic anhydride with NH2SO3H as catalyst.Also made the preliminary tests to PVC glove in which ATBC.was the plastisizer.The optimum reaction conditions of esterification were determined as follows: molar ratio of butanol to citric acid was 4.0︰1, amount of catalyst was1% (based on the mass of citric acid), m(Ce(SO4)2·4H2O)︰m(NH2SO3H)=2︰1, reaction temperature was low than 150℃, reaction time was 5h, esterification yield could be up to 98.5%. The refined technics of TBC included recycling of catalyst, dealcholization, neutralization, decoloring, bathing, evaporation, the purity of TBC was over 99.5%.Catalytic mechanism was that the major catalyst formed Bronsted-catalystic reaction,while the cocatalyst sulfamic acid enhanced the amount and strength of acid sites on ceric sulfate tetrahydrate.The reaction condition of aetylization have also been optimized to reach a very good yield: molar ratio of tributyl citrate to acetic anhydride was 1.0︰1.6, reaction time was 3h at 70℃, amount of catalyst was 1% (based on the mass of tributyl citrate). The refined technics of ATBC included recycing of catalyst, deacidification, evaporation, the purity of ATBC was over 99.3%.All the technical performance of TBC and ATBC are qualified to authorized standards. Applied experiments indicated ATBC was low temperature plasticizer, when the temperature exceeded 60℃, the viscosity got shape increase,plasticization temperature was 195℃.
Keywords/Search Tags:tributyl citrate, acetyl tributyl citrate, esterification, acetylation, plastic additives
PDF Full Text Request
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