Alcoholysis of esterlinkages in solution

Hettrich, W.; Joel, Detlef; Becker, Hans; Wehrstedt, Carla

doi:10.1002/apmc.1990.051790110

Cited by 1 publication

(2 citation statements)

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“…As expected, alkoxytin derivatives are the best catalysts in polymerization of lactones (34). In esterification processes, all the tin derivatives that can generate alkoxides such as oxides or chloro derivatives are also very active (29,(35)(36)(37). However, carboqlates that are not easily transformed into &oxides, and sulfides, which cannot be transformed into alkoxides at all, have little or no catalytic activity (26,29,37).…”

Section: Experzmentalmentioning

confidence: 99%

“…In esterification processes, all the tin derivatives that can generate alkoxides such as oxides or chloro derivatives are also very active (29,(35)(36)(37). However, carboqlates that are not easily transformed into &oxides, and sulfides, which cannot be transformed into alkoxides at all, have little or no catalytic activity (26,29,37). Steric hindrance of tin substitutents and/or alkoxy or carboxyl substituents reduces the catalytic activity (29,34,38).…”

Section: Experzmentalmentioning

confidence: 99%

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Kinetics of polyesterification of adipic acid with 1,3‐butanediol

Bacaloglu¹,

Fisch²,

Biesiada³

1998

Polymer Engineering & Sci

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The kinetics of non-catalyzed, acid catalyzed and alkyltin catalyzed polyesterifcation of adipic acid with 1, 3-butanediol as a model for polymeric ester synthesis was followed at 180°C and 2 15°C by monitoring of carboxyl, hydroxyl, and water content of the reaction system. The rate constants of the three processes were calculated using a simulation method. The process is kinetically controlled during the first 4-10 h (down to AV = 20 mg KOH/g, conversion 95%) and then thermodynamically controlled by elimination of water from the system. Methyltin derivatives, especially trichloride, are more active catalysts but dibutyltin oxide can be used with good results. The model study suggests that addition of the catalyst at the beginning of the process and applying a vacuum (pressure 60 Tom) will reduce the reaction time in half, compared with adding catalyst at AV = 20 mg KOH/g and using no vacuum. 0 L R " c scheme 3.

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Section: Experzmentalmentioning

confidence: 99%