The+Issues+From+Formaldehyde.12-3

media type="custom" key="7683683" media type="custom" key="7683839" align="right"



formaldehyde has IUPAC name that is methanal and the other name of formaldehyde are formol, methyl aldehyde, methylene oxide, methanal, methylene glyco
 * Formaldehyde** (systematic name: methanal) is an [|organic compound] with the [|formula] CH 2O. As the simplest [|aldehyde], it is an important precursor to many other chemical compounds, especially for polymers.
 * molecular formula : CH 2O
 * molar mass : 30,03 g/mol
 * density : 1,38 g/ml
 * melting point : -92 0C (pure), −15 °C (37% solution)
 * boiling point : -21 °C (p ure), 96 °C (37% solution)
 * solubility in water : very high
 * pH : 2.8 (31% solution)

Formaldehyde is a colorless, flammable gas at room temperature. It has a pungent, distinct odor and may cause a burning sensation to the eyes, nose, and lungs at high concentrations. Formaldehyde is also known as methanal, methylene oxide, oxymethylene, methylaldehyde, and oxomethane. Formaldehyde can react with many other chemicals, and it will break down into methanol (wood alcohol) and carbon monoxide at very high temperatures.

Formaldehyde is naturally produced in very small amounts in our bodies as a part of our normal, everyday metabolism and causes us no harm. It can also be found in the air that we breathe at home and at work, in the food we eat, and in some products that we put on our skin. A major source of formaldehyde that we breathe everyday is found in smog in the lower atmosphere. Automobile exhaust from cars without catalytic converters or those using oxygenated gasoline also contain formaldehyde. At home, formaldehyde is produced by cigarettes and other tobacco products, gas cookers, and open fireplaces. It is also used as a preservative in some foods, such as some types of Italian cheeses, dried foods, and fish. Formaldehyde is found in many products used every day around the house, such as antiseptics, medicines, cosmetics, dish-washing liquids, fabric softeners, shoe-care agents, carpet cleaners, glues and adhesives, lacquers, paper, plastics, and some types of wood products. Some people are exposed to higher levels of formaldehyde if they live in a new mobile home, as formaldehyde is given off as a gas from the manufactured wood products used in these homes.

Formaldehyde is used in many industries. It is used in the production of fertilizer, paper, plywood, and urea-formaldehyde resins. It is present in the air in iron foundries. It is also used in the production of cosmetics and sugar, in well-drilling fluids, in agriculture as a preservative for grains and seed dressings, in the rubber industry in the production of latex, in leather tanning, in wood preservation, and in photographic film production. Formaldehyde is combined with methanol and buffers to make embalming fluid. Formaldehyde is also used in many hospitals and laboratories to preserve specimens.

Formaldehyde................37%  Methyl Alcohol...............10 - 15%  Water.............................48 - 53%

According to the MSDS

Formalin besides the price is cheap, easily available and its use is not difficult so it is very desirable as a preservative by food manufacturers are not responsible. The survey results and laboratory examination showed, a number of food products using formaldehyde as a preservative. Suggested use of formalin is: In concentrations less than 1%, formalin is used as a preservative in household cleaning, dishwashing liquid, fabric softener, car shampoo, wax, and carpet.
 * As a germ killer, which is widely u sed in cleaning floors, clothes, vessels and warehouses,
 * Flies and other insect repellent ,
 * Any of the ingredients in the manufacture of artificial silk, dy es and explosives glass mirror,
 * Hardener layer of gelatin and photo paper,
 * Urea fertilizer ingredient, perfume, nail hardeners and preservatives cosmetic products,
 * Prevention of corrosion in oil wel ls,
 * Materials for insulation foam, and,
 * Plywood adhesives.

** Synthesis and industrial production **

Formaldehyde was first reported by the Russian chemist Aleksandr Butlerov (1828–86) and was conclusively identified by August Wilhelm von Hofmann. Formaldehyde is produced industrially by the catalytic oxidation of [|methanol]. The most common catalysts are silver metal or a mixture of an iron and molybdenu m or vanadium oxides. In the commonly used [|formox process], methanol and oxygen react at ca. 250–400 °C in presenc e of iron oxide in combination with molybde num and/or vanadium to produce formaldehyde according to the chemical equation

2 CH3OH + O2 → 2 CH2O + 2 H2O The silver-based usually operates at a higher temp erature, about 650 °C. Two chemical reactions on it simultaneously produce formaldehyde: that shown above and the dehydrogenation reaction:

CH3OH → H2CO + H2 In principle formaldehyde could be generated by oxidation of methane, but this route is not industrially viable because the formaldehyde is more easily oxidized than methane



Formaldehyde is a common building block for the synthesis of more complex compounds and materials. In approximate order of decreasing consum ption, products generated from formaldehyde i nclude urea formaldehyde resin, melamine resin, phenol formaldehyde resin, polyoxymethylene plastics, 1,4-butanediol, and methylene diphenyl diisocyanate. The textile industry uses formaldehyde-based resins as finishers to make fabrics crease-resistant. Formaldehyde-based materials are key to the manufacture of automobiles, and used to make components for the transmission, electrical system, engine block, door panels, axles and brake shoes. The value of sales of formaldehyde and derivative products was over $145 billion in 2003, about 1.2% of the Gross Domestic Product (GDP) of the United States and Canada. Including indirect employment, over 4 million work in the formaldehyde industry across approximately 11,900 plants in the U.S. and Canada. When reacted with phenol, urea, or me lamine formaldehyde produces, respectively, hard thermoset phenol formaldehyde resin, urea formaldehyde resin, and melamine resin, which are commonly used in permanent adhesives such as those used in plywood or carpeting. It is used as the wet-strength resin added to sanitary paper products such as (listed in increasing concentratio ns injected into the paper machine headstock chest) facial tissue, table napkins, and roll towels. They are also foamed to make insulation, or cast into moulded products. Production of formaldehyde resins accounts for more than half of formaldehyde consumption. Formaldehyde is also a precursor to polyfunctional alcohols such as pentaerythritol, which is used to make paints and explosives. Other formaldeh yde derivatives include methylene diphenyl diisocyanate, an important component in polyurethane paints and foams, and hexamine, which is used in phenol-formaldehyde r esins as well as the explosive RDX. Formaldehyde has been found as a contaminant in several bath products, at levels from 54–610 ppm: it is thought to arise from the breakdown of preservatives in the products.



Formaldehyde should not be used in food. Because it will cause death on the use of excessive and many effect. This is the picture formaldehyde in food..



The other function of formaldehyde :


 * as an antiseptic
 * as an insecticides
 * as a wood adhesive
 *  corrosion preventative oil wells
 * preservative corpse
 * manufacture of silk synthesis
 * raw materials mirror
 * dye substance