Acid paint removers

CH2CI2. A colourless liquid with a chloroform-like odour b.p. 4I°C. Prepared by heating chloroform with zinc, alcohol and hydrochloric acid manufactured by the direct chlorination of methane. Decomposed by water at 200°C to give methanoic and hydrochloric acids. Largely used as a solvent for polar and non-polar substances, particularly for paint removal (30%), dissolving cellulose acetate and degreasing (10%). It is more stable than carbon tetrachloride or chloroform especially towards moisture or alkali. It is somewhat toxic. U.S. production 1981 280000 tonnes. 

Uses Manufacture of ethylbenzene (preparation of styrene monomer), dodecylbenzene (for detergents), cyclohexane (for nylon), nitrobenzene, aniline, maleic anhydride, biphenyl, benzene hexachloride, benzene sulfonic acid, phenol, dichlorobenzenes, insecticides, pesticides, fumigants, explosives, aviation fuel, flavors, perfume, medicine, dyes, and many other organic chemicals paints, coatings, plastics and resins food processing photographic chemicals nylon intermediates paint removers rubber cement antiknock gasoline solvent for fats, waxes, resins, inks, oils, paints, plastics, and rubber. 

Uses Solvent used in organic synthesis, paint removers, plastics, resins, gums, and electrolytes chemical intermediate catalyst extracting agent for gases and oils purifying and crystallizing aromatic dicarboxylic acids. 

Right now there is no easy way to dispose of very small quantities of hazardous household products, such as pesticides, batteries, outdated medicines, paint, paint removals, used motor oil, wool preservatives, acids, caustics, and so on. There are no places that accept such small quantities of wastes as generated by a small industrial/commercial site. For now, the best disposal techniques are listed in Table 1, which is recommended by the Massachusetts Department of Environmental Management, Bureau of Solid Waste Disposal. 

Paint removers - [PAINT - PAINTAND FINISH REMOVERS] (Vol 17) -use of sodium orthophosphates [PHOSPHORIC ACID AND PHOSPHATES] (Vol 18)... 

Uses The alicyclic hydrocarbons have numerous industrial applications. Cyclopropane (C3H6) is used as an anesthetic. Cyclohexane (CgH ) is used as a chemical intermediate as an organic solvent for oils, fats, waxes, and resins and for the extraction of essential oils in perfume manufacturing industries. Cyclohexene (C6H10) is used in the manufacture of maleic acid, cyclohexane carboxylic acid, and adipic acid. Methyl cyclohexane (C7H14) is used for the production of organic synthetics such as cellulose ethers. These compounds are used in different industries such as adipic acid makers, benzene makers, fat processors, fungicide makers, lacquerers, nylon makers, oil processors, paint removers, plastic molders, resin makers, rubber makers, varnish removers, and wax makers. 

Estimate the concentrations of hydroxide ion in a 1 F solution of Na3P04, using the acid constants for phosphoric acid from the preceding chapter. Can you say why this substance is used as a cleaner and paint-remover, as a substitute for ly ... 

Oxalic acid is used in the manufacture of dyes, inks, bleaches, paint removers, varnishes, wood and metal cleaners, dextrin, cream of tartar, celluloid, tartaric acid, purified methyl alcohol, glycerol, and stable hydrogen cyanide. It is used in the following industries photographic, ceramic, metallurgic, rubber, leather, engraving, pharmaceutical, paper, and lithographic. 

Xylenes are used as thinners solvents in paints, inks, rubbers, gums, resins, adhesives, and lacquers paint removers and as intermediates in the production of plasticizer (phthalic acid and anhydride) and polyester fibers. They are also used extensively as intermediates in the manufacture of perfumes, dyes, insecticides, and pharmaceuticals. The annual production of mixed xylenes varies between 6 and 12 billion pounds. 

Use Intermediate for synthesis of butyric acid compounds, polyvinylpyrrolidone, methionine, solvent for acrylate and styrene polymers, ingredient of paint removers and textile assistants. 

Dimethylformamide (DMF) has been known since 1893, but since the 1950s, it has evolved as an important solvent. Its main uses are as a solvent for spinning acrylic fibers, polyurethane and polyamide coatings and films, PVC, polyacrylonitrile, extraction of aromatics from petroleum, selective solvent for removal of acid gases from natural gas, solvent for dyes, electrolyses in galvanization processes, and paint remover and cleaner [16]. By 1980, the worldwide production of DMF had grown equal to the production of formic acid at 220,000 metric tons per year [18]. By 1993 the U.S. production of formic acid was 30 to 35 mm pounds and DMF production had grown to 60 to 65 mm pounds. 

Solvents used for paint removal are able to dissolve or considerably swell physically drying binders (e.g., vinyl chloride copolymers, cellulose nitrate, polyacrylates) and chemically cross-linked coatings (e.g., oil-based paints, dried alkyd resins, cross-linked polyester-melamine resins, cross-linked epoxy and isocyanate coatings) [14.237]. A combination of dichloromethane with low-boiling ketones or esters is particularly suitable. Small amounts of high-boiling solvents with a low volatility (e.g., tetrahydronaphthalene, solvent naphtha, methyl benzyl alcohol, or benzyl alcohol) are added to these mixtures to retard evaporation and increase the solvency. Modern paint removers do not contain chlorinated hydrocarbons, they are formulated on the basis of high boilers (e.g., dimethylformamide, dimethyl sulfoxide, propylene carbonate, and yV-methylpyrrolidone) in combination with alcohols and aromatics, or consist of aqueous, frequently alkaline or acidic systems. 

Uses Synthetic flavor and fragrance In foods and pharmaceuticals fragrance In cosmetics organic synthesis latent solvent Intermediate solvent for paints, lacquers, paint removers, cleaners, hydraulic fluids, pharmaceuticals fluorometric determinations llq. chromatography mfg. of Isobutyl esters for use In solvents, plasticizers, flavors, and perfumes extraction agent for phosphoric acid purification In food-pkg. adhesives defoamer In food-contact coatings and paper/paperboard In food-contact textiles Features Fruity flavor... 

The tar-acid-free and tar-base-free coke oven naphtha can be fractionated to give a narrowboiling fraction (170°C-185°C [340°F-365°F]) containing coumarone and indene. This is treated with strong sulfuric acid to remove unsaturated components and is then washed and redistilled. The concentrate is heated with a catalyst (such as a boron fluoride/phenol complex) to polymerize the indene and part of the coumarone. Unreacted oil is distilled off, and the resins obtained vary from pale amber to dark brown in color. They are used in the production of flooring tiles and in paints and polishes. 

Methylene chloride (dichloromethane) is most commonly used for paint removal. The stripping solution contains 55-85% methylene chloride. Ethanol (TLV and the Finnish OEL 1000 ppm), methanol (TLV and the Finnish OEL 200 ppm with skin notation), toluene and formic acid arc other common constituents. US National Institute of Occupational Safety and Health has recommended that methylene chloride be regarded as a potential carcinogen and that it should be controlled to the lowest feasible limit. Its TLV is 50 ppm (the Finnish OEL 100 ppm). 

Anticorrosion paints Etching acids Detergents Paint removers Solvents Tropical woods... 

Dibutylthiourea (CAS 109-46-6), 1% petrolatum (paint removers) (Kanerva et al. 1998) Dicyclohexylcarbodiimide (DCC) (CAS 538-75-0), 0.1% acid (peptide synthesis) (Lang and Hensel 1987) N,N-Diethyl-p-phenylenediamine (CAS 93-05-0), 0.25% petrolatum (water testing, bacteriology) (Price and Shupack 1978 Weller and Ormerod 1996) Diisocyanates (MDI and TDI) 2% petrolatum (polymer chemistry) (Estlander et al. 1992) N,N-Dimethyl-p-phenylenediamine(CAS 99-98-9), 1% petrolatum (neisseria gonorrhea staining) (Rietschel and Fowler 1995)... 

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