Thesis (Ph. D.)--University of Queensland, 2002. / Includes bibliographical references.

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No description available.

An attempt was made to producea -β or Ϫ - resorcinyl alcohol from disubstituted resorcinyls. To accomplish this 3,5-dibromo-β-resorcylic acid was reacted with lithium aluminium hybride, a mild reducing agent, in an attempt to reduce the acid group to the alcohol group. This disubstituted resorcinol was recovered unchanged. 3,5-dibromo-β-resorcyl-aldehyde was reduced by lithium aluminium hydride, but, instead of the alcohol forming, resinification took place. 2-methyl- 4-ethylresorcinol and 4,6-diethyrecorinol were reacted with formaldehyde under alkaline and acidic conditions. In each case a resin formed. The above experlments indicated that condensation took place in the meta position of the resorcinol molecule. Trimethylresorcinol was therefore reacted with formaldehyde under alkaline conditions, resulting in a small quantity ot the alcohol derivative. A better yield of the alcohol derivative was obtained by the hydrolysis or the chloromathyl derivative. In pursuing this line, a seres of new compounds and their derivatives were prepared. The condensation of the alcohol derivative with trimethylresorcinol and also with resorcinol was investigated.

PART ONE The long wave spectrum of formaldehyde vapour was observed at various temperatures. From this work it was shown that: 1. ) the α-band at 3703Å is a hot band probably arising from a lower state involving the coriolus coupled normal modes of vibration ν₅ = 1 and ν₆ = 1. 2. ) a series of bands designated as the B-bands originate from monomeric formaldehyde vapour and are probably due to a ³π ← n electronic transition. PART TWO The high resolution proton magnetic resonance spectra of hydroxyl hydrogen bonding systems and aldehydes were investigated. From this work it was shown that the forces responsible for hydrogen bonding are mainly electrostatic in nature and that the large magnitude of these forces is probably due to mutual polarization occurring in the molecular aggregates. / Science, Faculty of / Chemistry, Department of / Graduate

The object of this work was the investigation of the photochemical oxidation of formaldehyde in the gaseous phase at 110°C. Reaction mixtures, where the O2: CH₂O ratio was approximately 1:10, were irradiated with ultra violet light at a wavelength of 3130A⁰ and the reaction products analyzed. The major products were found to be CO, H₂ and HCOOH. CO₂ was a minor product. No peroxides were found and the reaction was oxygen independent at low O₂:CH₂O ratios. The formation of the major products was found to be directly proportional to the initial formaldehyde pressure and to the intensity of the absorbed light. A satisfactory mechanism is proposed to explain the formation of the reaction products, and the following kinetic equations were derived: [formula omitted] / Science, Faculty of / Chemistry, Department of / Graduate

No description available.

A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science (Chemistry) May 1993 / One of the greatest environmental drives in the synthetic resins field has been to decrease the formaldehyde emission from cured urea formaldehyde (UF) resins, without adversely affecting their excellent technical performance. [Abbreviated Abstract. Open document to view full version] / MT2017

by Ho Wai-ngan Sandra. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 197). / ACKNOWLEDGMENT / ABSTRACT / Chapter CHAPTER 1 --- GENERAL INTRODUCTION --- p.1 / REFERENCES --- p.8 / Chapter CHAPTER 2 --- BRIEF REVIEW OF THE ANALYTICAL METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.9 / Chapter 2.1 --- REVIEW OF SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.9 / Chapter 2.2 --- REVIEW OF CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF FORMALDEHYDE --- p.13 / Chapter 2.3 --- BASIC PRINCIPLES --- p.17 / REFERENCES --- p.20 / Chapter CHAPTER 3 --- SPECTROPHOTOMETRIC DETERMINATION OF FORMALDEHYDE --- p.21 / Chapter 3.1 --- INTRODUCTION --- p.21 / Chapter 3.2 --- EXPERIMENTAL --- p.24 / Chapter 3.3 --- RESULT AND DISCUSSION --- p.29 / Chapter 3.4 --- CONCLUSION --- p.58 / REFERENCES --- p.59 / Chapter CHAPTER 4 --- EFFECT OP COUNTER ANIONS AND CO-ANIONS IN ION INTERACTION CHROMATOGRAPHY --- p.60 / Chapter 4.1 --- INTRODUCTION --- p.60 / Chapter 4.2 --- EXPERIMENTAL --- p.73 / Chapter 4.3 --- RESULTS AND DISCUSSION --- p.78 / Chapter 4.4 --- CONCLUSION --- p.150 / REFERENCES --- p.151 / Chapter CHAPTER 5 --- CHROMATOGRAPHIC DETERMINATION OF FORMALDEHYDE --- p.153 / Chapter 5.1 --- INTRODUCTION --- p.153 / Chapter 5.2 --- EXPERIMENTAL --- p.154 / Chapter 5.3 --- RESULTS AND DISCUSSION --- p.158 / Chapter 5.4 --- CONCLUSION --- p.187 / REFERENCES --- p.188 / "APPENDIX OCCURENCE, TOXICOLOGY & BIOCHEMISTRY OF FORMALDEHYDE" --- p.188 / Chapter A1 --- INTRODUCTION --- p.188 / Chapter A2 --- OCCURENCE --- p.188 / Chapter A3 --- BIOCHEMISTRY --- p.192 / Chapter A4 --- TOXICOLOGY --- p.193 / REFERENCES --- p.197 / LEGENDS FOR FIGURES / LEGENDS FOR TABLES

Doctor of Philosophy (PhD) / This work involves an experimental and kinetic modelling study of the silver catalysed reaction of methanol to formaldehyde. The motivation for this was the desire to investigate the potential for Process Intensification in formaldehyde production. Formaldehyde production from methanol over silver catalyst is a fast, exothermic process where dilution is used to control heat release, and these properties are both indicators of Process Intensification potential. The process is run adiabatically and produces hydrogen (which is currently burnt). Oxygen is consumed during the reaction but is also required to activate the catalyst and is fed in understoichiometric quantities. The central overall reactions in the silver catalysed process for formaldehyde production are oxydehydrogenation CH3OH + ½ O2 -> CH2O + H2O (DH = -159kJ/mol) and dehydrogenation CH3OH <-> CH2O + H2 (DH = 84kJ/mol). When sufficient oxygen is available, formaldehyde can be further oxidised to carbon dioxide CH2O + O2 -> CO2 + H2O (DH = -519kJ/mol). Formaldehyde can decompose to carbon monoxide and hydrogen CH2O <-> CO + H2 (DH = 12.5kJ/mol). Oxidation of methanol and hydrogen also occurs and other minor products of the reaction are methyl formate, methane and formic acid. These overall reactions do not adequately describe the silver catalysed reaction mechanism. In particular, the overall dehydrogenation reaction does not include oxygen as a reactant, but it will not occur over silver that does not have active atomic oxygen species adsorbed on the surface, and these atomic oxygen species are formed from gas phase oxygen. In the absence of a complete mechanism for silver catalysed formaldehyde production, the intensification of the process was investigated using a thermodynamic model (based on the overall oxydehydrogenation and dehydrogenation reactions, not reaction kinetics). It was found that by using heat exchange (rather than heat generated from the exothermic oxydehydrogenation path) and a lower oxygen concentration in the feed stream, hydrogen selectivity could be increased while maintaining the required methanol conversion. Before this iv opportunity could be further investigated, a complete reaction mechanism that would allow the requirement of oxygen for catalyst activation to be included was required. There is agreement in the literature that two active atomic oxygen species react with methanol on silver. These are weakly bound atomic oxygen (Oa) and strongly bound atomic oxygen (Og). The location of Oa is on the surface of the silver, while the location of Og has been described as being in the silver surface (where it substitutes for silver atoms). Both species react with methanol to form formaldehyde. When the concentration of Oa is high enough, Oa will also react with formaldehyde forming carbon dioxide (while Og will not). The literature presents differing views on the extent of involvement of each atomic oxygen species in industrial formaldehyde production. There is also disagreement on the pathways for water and hydrogen formation. An extensive experimental investigation of the partial oxidation of methanol to formaldehyde was carried out using a flow reactor. The effect of temperature (250- 650°C), reactant concentration (7000-40000ppm methanol) and the feed ratio of methanol to oxygen (2.5-5.5) were studied. The extreme case of methanol reaction with Og in the absence of gas phase oxygen was also investigated. To isolate the effect of secondary reactions, the oxidation of formaldehyde, carbon monoxide and hydrogen were investigated, both in the presence and absence of silver catalyst. When methanol was exposed to silver catalyst that had been activated by being covered in Og (with this being the only source of oxygen) the catalytic nature of Og was demonstrated by the high selectivity to formaldehyde and hydrogen that was achieved (with very little carbon dioxide or water production). When gas phase oxygen was fed to the reactor along with methanol, hydrogen selectivity over silver increased up to about 40% as the concentration of reactants was increased. This result is consistent with the general rule of thumb from industrial practice that hydrogen selectivity is about 50%. When formaldehyde and oxygen were exposed to silver in the flow reactor, the only reaction products were carbon v dioxide and water and the combination of high temperature and excess oxygen was required for complete conversion of formaldehyde. A pseudo-microkinetic model (based on a Langmuir-Hinshelwood mechanism) for the partial oxidation of methanol to formaldehyde (over silver) was taken from the literature and investigated. This model predicts formaldehyde production using only Oa (no other active atomic oxygen species are included) but lacks pathways for reactions between Oa and adsorbed hydrogen or hydroxyl (so the only possible fate of adsorbed H atoms is to desorb as H2). The Oa model was combined with literature models for hydrogen desorption and the reactions involving adsorbed hydroxyl (desorption, self reaction, decomposition and reaction with adsorbed hydrogen). Comparison of this Hybrid model with experimental data showed that reactions involving Oa will predict formaldehyde formation and oxidation, but not hydrogen formation (because the rate of hydrogen desorption is too slow compared with the rate of water formation). It is concluded that any detailed model must include the reaction between methanol and Og (producing hydrogen). Although the reaction between two adsorbed OgH species has been suggested as the pathway for hydrogen formation from Og, this is not certain and so all possible reactions involving Og and hydrogen need be investigated and the appropriate pathways added to the Hybrid model. Once a complete microkinetic mechanism for the partial oxidation of methanol to formaldehyde over silver is available it can be used to further investigate the process intensification of this process. In particular, the use of staged addition of oxygen (to keep the catalyst active) combined with heat exchange (to replace the heat normally supplied by the oxydehydrogenation path) with the aim of simultaneously maximizing methanol conversion and selectivity to formaldehyde and hydrogen.