Transesterification


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transesterification

[¦trans·e¦ster·ə·fə′kā·shən]
(organic chemistry)
Conversion of an organic acid ester into another ester of that same acid.

Transesterification

 

the general name for the processes of alcoholysis (1), acidolysis (2), and ester (RCOOR’) interchange (3):

(1) RCOOR’ + R”OH ⇄ RCOOR” + R’OH

(2) RCOOR’ + R”COOH ⇄ R”COOR’ + RCOOH

(3) RCOOR’ + R”COOR”’ ⇄ RCOOR’” + R”COOR’

The catalysts of transesterification are acids (HCl, HBr, and H3PO4), BF3, and salts of Zn and Co. A shift in the equilibrium toward the right is usually achieved by distillation of the more volatile alcohol (R’OH), acid (RCOOH), or ester.

Transesterification is widely used in preparative organic chemistry and the chemical industry. Thus, bis-β-hydroxyethyl terephthalate, which yields polyethylene terephthalate upon heating to 275°–290°C under vacuum, is obtained from dimethyl terephthalate and ethylene glycol. Transesterification is one of the industrial methods of producing polycarbonates.

References in periodicals archive ?
Analytical results of the infrared of castor oil biodiesel and of the pure castor oil used as a pattern show that the castor oil transesterification process took place correctly, allowing this experimental mechanism to be carried out for the final production of biodiesel.
Renewable raw material such as oil could be converted into its corresponding fatty ester (biodiesel) by transesterification reactions.
Biodiesel can be produced by transesterification of fat-rich feedstock like various oils and waste fats.
The oil is chemically converted to biodiesel using the process of transesterification, which reacts the oily triglyceride content with alcohol using a catalyst.
Then they look at sources, the chemistry, extracting oil at laboratory and commercial scales, biodiesel synthesis, factors affecting the transesterification reaction, fuel properties, and technical aspects.
The plant will produce the fuel through the continuous transesterification process, using technology from the Desmet Ballestra Group, an international company headquartered in Paris.
Biodiesel fuels were prepared from a special type of frying oil namely spent fish frying oil through two step transesterification viz.
According to the company, the new divisional application covers the transesterification approach to synthesising DDAIP (the main chemical penetration enhancing compound used in the NexACT technology) and results in a product containing relatively lower levels of by-products and unreacted reactants.
The process of converting vegetable oil into biodiesel fuel is called transesterification means taking a triglyceride molecule, or a complex fatty acids, removing the glycerin, and creating an alcohol ester.
Operation Variables in the Animal-Fat Transesterification Process: a Review (2)
Controlling and monitoring system is realized on base of knowledge of the free fatty acids transesterification to the biodiesel.
Marin, Kinetics of heterogeneously MgO-catalyzed transesterification, Appl.