Kinetic studies of ethylene oxidation by potassium permanganate adsorbed on various carriers

Date

6-2005

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Edralina P. Serrano

Co-adviser

Alma O Gonzales

Committee Member

Dolores P Buquiran

Abstract

The ethylene scrubbing efficiency and stability of three KMnO4-carrier mixtures were studied, namely rice hull ash, coconut coir dust and lahar ash. The kinetic order (n) with respect to ethylene of the reaction between C2114 and KMnO4 was equal to 1.35 ± 0.39, 1.46 ± 1.09 and 0.84 ± 0.18 for rice hull ash-based scrubber, coconut coir dust-based scrubber and lahar ash-based scrubber, respectively. Rate constants, k' and k, were calculated based on pseudo-first order kinetics. The ethylene scrubbing efficiency was evaluated using the calculated k' and k, i.e., the permanganate-dependent and intrinsic rate constants, respectively. It was found that 0.04 M was the optimum lain°, concentration for scrubbing ethylene with rate constant. k' values of 0.0216 ± 0.0020 min'', 0.0005 ± 0.0015 midi and 0.0085 ± 0.0006 min' for rice hull ash-based scrubber, coconut coir dust-based scrubber and lahar ash -based scrubber, respectively. Rice hull ash was found to be the most effective carrier for the ethylene scrubber followed by lahar ash and then coconut coir dust. Lahar ash-based scrubber had the highest k value of 8.12 ± 0.75 g carrier-min-1/g KMnO4, followed by rice hull ash-based scrubber with 2.28 ± 0.21 g carrier-min4 KMnO4 and coconut coir dust-based scrubber with 0.21 ± 0.04 g carrier-min4 KMnO4 at 0.04 M KMnO4. At the same KMnO., loading the lahar ash-based scrubber, was more efficient followed by rice hull ash-based scrubber and coconut coir dust-based scrubber. The ethylene scrubbing efficiency can be better described by the permanganate-dependent rate constant, k' (rate constant per gram scrubber), than the intrinsic rate constant, k (rate constant per g KMn04), Therefore. the most efficient scrubber was the rice hull ash-based scrubber, followed by lahar ash-based scrubber and coconut coir dust-based scrubber. The scrubber stability was determined by measuring how much the rate constants, k' and k of the scrubbers change with time. It was found that the lahar ash-based scrubber had the fastest decrease in k' and k with time with a slopes of -5.93x le and -0.471, respectively, followed by the coconut coir dust-based scrubber with corresponding slopes of -2.57x104 and -0.007. On the other hand, rice hull ash-based scrubber had a slope of almost 0 for both rate constants. The zero or less negative slope indicated scrubber stability; therefore. the most stable scrubber was the rice hull ash-based scrubber followed by the coconut coir dust-based scrubber and the least stable was the lahar ash-based scrubber.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2005 A13 H47

Document Type

Thesis

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