Corrosive liquid, acidic, organic

Corrosive Liquid, acidic, organic. 3265 60 Coumarin Derivative Pesticides. 3024 28... 

The corrosion behaviour can divided into a few main classes (Table 14). In most organic liquids (excluding organic acids) no corrosion was observed. 

Minor uses of vanadium chemicals are preparation of vanadium metal from refined pentoxide or vanadium tetrachloride liquid-phase organic oxidation reactions, eg, production of aniline black dyes for textile use and printing inks color modifiers in mercury-vapor lamps vanadyl fatty acids as driers in paints and varnish and ammonium or sodium vanadates as corrosion inhibitors in flue-gas scrubbers. 

Sulphunc Acid. This is a colorless. odorless acid, and highly corrosive liquid, formed by the union of 1 equivalent of Biupbur and 3 of oxygen. It is immediately colored by contact with organic matter. It attracts water so rapidly from the atmosphere, when freely exposed to it, as to absorb its weight in 24 hours and, under continued exposure, will absorb 6 times its weight. 

METHYL DICHLOROETHANOATE (116-54-1) C3H4CI2O2 Combustible, water-reactive liquid (flash point 176°F/80°C). Contact with water causes heat and decomposition to corrosive dichloroacetic acid. Aqueous solution is an acid. Incompatible with sulfuric acid, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, epichlorohydrin, organic anhydrides, isocyanates, vinyl acetate. Strong oxidizers may cause fire and explosions. Attacks metals in the presence of moisture. Thermal decomposition releases toxic phosgene and HCl gases. 

CHEMICAL PROPERTIES flammable liquid corrosive liquid form will attack some forms of plastics, rubber, and coatings heat contributes to instability may react with strong acids, strong oxidizers, chlorine, hypochlorite, halogenated compounds, reactive organic compounds, and some metals FP (-9°C, 16°F) LFL/UFL (1.2%, 8%) AT(249°C, 480 F) HC (-1036.8 kcal/gmol at 20°C) HF (-127.7 kJ/mol liquid at 25°C). 

Oil of vitriol, or hydrated sulphuric acid, is an oily liquid, nearly twice as heavy as water, very acid and corrosive, charring all organic matters, apparently by its very strong attraction for water, or its elements. It freezes at—31", and boils at 617°. 

The corrosion inhibitors appear to possess properties that impart to metals resistance to attack by a variety of corrosive agents, such as brines, weak inorganic acids, organic acids, COj, HjS, etc. The method of carrying out this process is relatively simple in principle the corrosion preventive reagent is dissolved in the liquid corrosive medium in small amounts and is thus kept in contact with the metal surface to be protected. Alternatively, the corrosion inhibitor may be applied first to the metal surface, either as it is or as a solution in some carrier liquid or paste. Continuous application, as in the corrosive solution, is the preferred method, however. The concentration of the corrosion inhibitors varies widely, but the preferable concentrations are 15-250 ppm. 

From a practical point of view, isocyanates, together with carbamates and ureas (Chapter 3), are the most important organic products discussed in this book. Their synthesis from nitroarenes has indeed been the subject of many patents. There are also limited examples of aliphatic isocyanates obtained by this route. Organic mono- and diisocyanates may be prepared in a continues liquid phase method by treating the appropriate amine with phosgene. However, the reaction is rather complex [6] and, besides the use of the dangerous phosgene, the formation of the corrosive hydrochloric acid creates several problems. Aliphatic isocyanates can also be obtained from olefins with isocyanate ion in the presence of a salt of a coordination compound of palladium or platinum [7], from olefins with isocyanic acid in the vapour phase over Pt/ALOs [8], and from formamides, by oxidation over a silver catalyst [9]. Apparently only the last reaction seems to have some potential practical applications [10]. 

Dry methyl chloride is very stable at normal temperatures and in contact with air. In the presence of moisture, it hydrolyzes slowly, which results in the formation of corrosive hydrochloric acid. At temperatures above 700°F (37 rC), methyl chloride may decompose into toxic end-products (hydrochloric acid, phosgene, chlorine, and carbon monoxide). It is slightly soluble in water and very soluble in alcohol, mineral oils, chloroform, and most organic liquids. 

---