Formation regulation of various rosin esters and intensification mechanism using pressurized CO 2

• Main Authors: Zhou, Dan, Linlin Wang, Xiaopeng Chen, Xiaojie Wei, Jiezhen Liang, Weixiang Tang, Lijiang Yin
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Taylor & Francis 2020
• Subjects: Biophysics; Biochemistry; Space Science; Medicine; Microbiology; FOS Biological sciences; Pharmacology; Evolutionary Biology; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; 39999 Chemical Sciences not elsewhere classified; FOS Chemical sciences; Ecology; 69999 Biological Sciences not elsewhere classified; Marine Biology; Carbonic acid
• Online Access: https://dx.doi.org/10.6084/m9.figshare.13169540.v1; https://tandf.figshare.com/articles/online_resource/Formation_regulation_of_various_rosin_esters_and_intensification_mechanism_using_pressurized_CO_sub_2_sub_/13169540/1

The esterification of rosin with pentaerythritol (PE) was studied, using pressurized CO 2 as an intensified additive to high-temperature water (HTW), which formed the various esters with different soften points to meet industrial applications. A multiple linear regression model was established to determine the dependence of independent variables (CO 2 pressure, temperature, PE-to-rosin mass ratio and reaction time) on rosin conversion, where the elasticity of the logarithm of CO 2 pressure was 0.13, indicating pressurized CO 2 -HTW can effectively enhance this esterification. The conversion of rosin could be improved either by increasing the PE-to-rosin mass ratio or the reaction time, but products were monoester and triesters, respectively, thus the process regulation for the formation of various esters can be achieved through operating conditions. A corresponding stepwise esterification was proposed. Furthermore, the catalytic mechanism of pressurized CO 2 -HWT for this esterification were identified to be the acid catalysis of carbonic acid and the enhancemennt of CO 2 .