Welcome To UTPedia

We would like to introduce you, the new knowledge repository product called UTPedia. The UTP Electronic and Digital Intellectual Asset. It stores digitized version of thesis, dissertation, final year project reports and past year examination questions.

Browse content of UTPedia using Year, Subject, Department and Author and Search for required document using Searching facilities included in UTPedia. UTPedia with full text are accessible for all registered users, whereas only the physical information and metadata can be retrieved by public users. UTPedia collaborating and connecting peoples with university’s intellectual works from anywhere.

Disclaimer - Universiti Teknologi PETRONAS shall not be liable for any loss or damage caused by the usage of any information obtained from this web site.Best viewed using Mozilla Firefox 3 or IE 7 with resolution 1024 x 768.

Hydroformylation of Higher Olefins Using Radium Phosphite Complex Catalyst

SHAHARUN, MAIZATUL SHIMA (2009) Hydroformylation of Higher Olefins Using Radium Phosphite Complex Catalyst. PhD thesis, Universiti Teknologi PETRONAS.

[img] PDF
Download (5Mb)

Abstract

Hydroformylation of olefins with CO and Hz at total pressure of IS to 50 bar and temperature of 80 to l20°C, in presence of rhodium (Rh)-based homogeneous catalysts for production of aldehydes has demonstrated high yields and selectivity. Rh-based catalysts are expensive and the commercial viability of a process that uses such catalysts substantially depends on the efficiency of catalyst recovery and product separation. In this work, a novel temperature dependent multi-component solvent (TMS) or 'thermomorphic solvent' system has been used as the reaction medium to investigate hydroformylation of two higher olefins - 1-octene and 1-dodecene - to synthesize the corresponding aldehydes at a lower pressure of 15-25 bar and temperature of 80 to 100°C. Such a solvent mixture changes thermally from biphasic to monophasic with distribution of the products and of the catalyst in the non-polar and polar phases thus simplifying the process of separation and recycling of the catalyst. A TMS- system consisting of three components - propylene carbonate (PC), ndodecane and 1,4-dioxane was used in this study. The presence of 1,4-dioxane imparts the thermomorphic character to the solvent mixture. For a gas-liquid reaction, the solubility of the reactant gas in the liquid medium is an important parameter required for the interpretation of reaction kinetics. Therefore experimental measurement of solubility of the gaseous reactants - CO and Hz - in the individual components of the solvent as well as in their mixtures was performed up to a pressure of 1.5 MPa and temperature range of 298-343 K. The effects of solvent composition, partial pressures of the gaseous reactants - CO and Hz, reaction temperature and catalyst loading on the rate, yield and selectivity of the linear aldehydes were also investigated. At a reaction temperature of 363 K and total pressure of 1.5 MPa and 0.68 mM HRh(CO)(PPh3)3, the conversion of 1- octene and the yield of aldehyde were 97 % and 95 %, respectively. The aldehyde product was recovered in the non polar phase whereas the catalyst remained in the polar phase with low catalyst loss of 3 %. With a reaction-time of 2 h and a selectivity of 89 %, this catalytic system can be considered as highly reactive and selective. The rate was found to be first order with respect to catalyst, 1-octene and PH, . The rate vs. Pco resembled a typical case of substrate inhibited kinetics. Hydroformylation of Higher Olefins Using Radium Phosphite Complex Catalyst

Item Type: Thesis (PhD)
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:43
URI: http://utpedia.utp.edu.my/id/eprint/7988

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...