Applications and Mode of Action of Formaldehyde Condensate Biocides

The use of biocides to control sulphate‐reducing bacteria in biofilms on mild steel surfaces

“…In water it becomes hydrated to methylene glycol, CH 2 (OH) 2 and reacts with amines, amides, sulphides, purines, pyrimidines forming methylene bridges. It has been proposed that these bridges interfere with the normal activity of the cells (Rossmoore & Sondossi, 1988). ITZ usually exists as a mixture two compounds.…”

“…Chemical control by the use of biocides is probably the most common method of controlling biocorrosion (Brunt, 1987;Boivin, 1995). Halogenated biocides (Norman et al, 1977;Keevil et al, 1990;LeChevallier et al, 1990) as well as other types of compounds such as formaldehyde (Rossmoore & Sondossi, 1988), isothiozolone (Fuller et al, 1985;Collier et al, 1990) and glutaraldehyde (Gorman & Scott, 1980;Eagar et al, 1986a) are frequently used.…”

Biocide testing for the application in the oil and gas industry

“…In the tests hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine was used. According to available literature [21] sym-triazine is a chemical product which has strong antibacterial properties. It is commonly used as preservative for lubricants and other industrial applications.…”

“…The examined antibacterial product, being derivative of triazine, is the result of reaction of formaldehyde with methylamine. The principle of biocidal action of sym-triazine consists in splitting off of a fragment of formaldehyde [21,22] Magnesium peroxide (MgO 2 ) occurs as white amorphous powder. In the presence of water MgO 2 decomposes and hydrogen peroxide is created which then undergoes exothermic disintegration to water and oxygen, in accordance with the following reactions:…”

Chemical preservatives

“…These reaction types are shown in Scheme 2.10, but it must be emphasized that these are only a small fraction of the potential starting materials and reactions possible, and the reader is recommended to consult some of the many excellent reviews available. 22 All these many addition and condensation reactions are potentially reversible but the position of equilibrium and the speed of the reaction to re-establish equilibrium once the equilibrium is disturbed (e.g. by removing formaldehyde from the system by reacting with some biological target) varies with the structure in question.…”