Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
9425902
Reference Type
Journal Article
Title
Thermodynamics and kinetics of dioctyl phthalate synthesis process
Author(s)
Li, S; Xi, Z; Zhao, L
Year
2015
Is Peer Reviewed?
Chk
Journal
Huaxue Fanying Gongcheng yu Gongyi / Chemical Reactive Engineering and Technology
ISSN:
1001-7631
Publisher
Zhejiang University
Volume
31
Issue
5
Page Numbers
385-392
Language
Chinese
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948763284&partnerID=40&md5=df85b68cc63e49e7b9fa1b36572cfbba
Exit
Abstract
The synthesis of dioctyl phthalate (DOP) involves mono-(2-ethylhexyl) phthalate (MEHP) formation firstly by phthalic anhydride (PA) with 2-ethyl hexanol (2-EH) and further esterification between MEHP and 2-EH to generate DOP, and the second reaction is reversible and the controlling step. Since MEHP conversion is usually demanded to be over 99.5%, the influence of DOP hydrolysis cannot be neglected. The thermodynamic properties were calculated by Benson, Ducros and Ruzicka-Domalski group contribution methods. The vapor-liquid equilibrium composition and reaction equilibrium constants of the controlling reaction as well as the kinetics with tetrabutyl titanate as catalyst were investigated experimentally in batch reactor. The result of thermodynamic experiments showed that the enthalpy and entropy of the reaction between MEHP and 2-EH were 17.91 kJ/mol and 54.64 J/(K·mol) respectively, and this reaction was endothermic with increasing entropy which was consistent with the theoretical calculation result. The activity coefficient of water and 2-EH in this reactive system was fitted well using Redlich-Kister equation. The kinetic model of reversible reaction between MEHP and 2-EH was established, both the forward and backward reaction can be treated as second-order reactions, and parameter regression showed that the activation energy and pre-exponential factor of the forward reaction were 83.49 kJ/mol and 1.75Ãl07 kg/(mol·min) respectively. © 2015, Editorial Board of Journal of Chemical Reaction Engineering and Technology. All right reserved.
Keywords
Dioctyl phthalate; Group contribution method; Iso-octyl alcohol; Monoethylhexyl phthalate; Reaction kinetics
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity