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Kinetics and reaction pathways of total acid number reduction of cyclopentane carboxylic acid using subcritical methanol

Mandal P. C., Nagarajan T.

Polish Journal of Chemical Technology

2016

Vol. 18, nr 3

44-49

Cyclopentane carboxylic acid (CPCA) is a model compound of Naphthenic acids (NAs). This objective of this paper is to discover total acid number (TAN) reduction kinetics and pathways of the reaction between CAPA and subcritical methanol (SubC-MeOH). The experiments were carried out in an autoclave reactor at temperatures of 180-220°C, a methanol partial pressure (MPP) of 3 MPa, reaction times of 0-30 min and CPCA initial gas phase concentrations of 0.016-0.04 g/mL. TAN content of the samples were analyzed using ASTM D 974 techniques. The reaction products were identified and quantified with the help of GC/MS and GC-FID respectively. Experimental results reveal that TAN removal kinetics followed first order kinetics with an activation energy of 13.97 kcal/mol and a pre-exponential factor of 174.21 s-1. Subcritical methanol is able to reduce TAN of CPCA decomposing CPCA into new compounds such as cyclopentane, formaldehyde, methyl acetate and 3-pentanol.

Synthesis of Silver Mono- and Di-Carboxylates and Investigation of their Usage Possibility in Textiles as an Antibacterial Agent

Aylin Y, Riza A, Merve O, Özgür A, Dumrul G, Mine A, Murat Y, Demet K. A.

Fibres & Textiles in Eastern Europe

2015

Vol. 23, no. 3 (111)

120--125

The study aims to examine the antibacterial efficiency of cotton fabrics loaded with silver cyclo hexane mono or di carboxylates (silver naphthenates). After the synthesis of silver naphthenates, their chemical structures were analysed with spectrophotometric methods (IR and NMR). Then the usage possibility of Ag naphthenates as an antibacterial agent in the finishing of cotton fabrics was investigated. Their antimicrobial activity against three gram-negative (Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa) nd three gram-positive (Staphylococcus aureus, Bacillus subtilis, Enterococcus faecalis) bacteria were studied. The stability of the antibacterial effect after repeated washings (1-5-10-20) was also tested.

Badania miały na celu określenie antybakteryjnej wydajności tkanin bawełnianych nasycanych cyklohexanem mono i di-karboxylanów (nafteniany srebra). Po syntezie związków badano ich strukturę chemiczną metodami spektrofotometrycznymi IR i NMR, następnie możliwości zastosowania otrzymanych związków srebra jako środków antybakteryjnych dla wykończania tkanin bawełnianych. Badano antybakteryjną aktywność przeciwko trzem bakteriom gram-ujemnych (Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa) oraz trzech bakterii gram-dodatnich (Staphylococcus aureus, Bacillus subtilis, Enterococcus faecalis) testowano również stabilność efektu antybakteryjnego po wielokrotnym (1, 5, 10, 20) praniu.