Today in History 2013: Taiwan discover new species Dragonstalker sulfuric acid diving wasps 2009: T

Formaldehyde and ammonia to generate superior Lotto product (hexamethylenetetramine), used as a urinary tract disinfectant. Lotto nitration product was excellent sulfuric acid RDX explosives (RDX, three ring-TRINITRAMINE amine). In the presence of calcium hydroxide, formaldehyde and acetaldehyde sulfuric acid can be obtained pentaerythritol. Pentaerythritol tetranitrate is PETN (PETN). Large amount of formaldehyde used in the production of urea-formaldehyde resins, phenolic resins and acetal resin. Formaldehyde can be processed into a variety of plant protein fibers, this characteristic both for tanning also used as a disinfectant, antiseptic sulfuric acid and soil sterilant corpses, pure formaldehyde is a colorless flammable gas with a strong pungent odor, a strong mucosal irritating. sulfuric acid
HCHO mainly obtained from methanol. At room temperature is a colorless gas with a strong pungent and suffocating odor. Can form explosive mixtures with air. Usually in the form of their goods containing sulfuric acid formaldehyde 35% to 50% (by mass) solution called formalin. History of formaldehyde in 1859 by Russian .. 布特列洛夫 discovered in 1889 in Germany for the first time the production of formaldehyde from methanol. Since then, other countries are starting to use this method to build production equipment and continuously improving production process. In addition, the United States has built a low-carbon alkane with several (mainly C ~ C) oxidation of formaldehyde production plant, Japan has established as a raw material in the production of formaldehyde, dimethyl ether devices, but they did not get the production line development. Production methods in the industry to take formaldehyde production (see pictures formaldehyde plant) from methanol, according to the catalyst used is different, there are two methods: Silver catalysis in the presence of excess methanol is higher sulfuric acid than that in methanol - air explosion limit be operation. Silver catalyst in methanol (see the metal catalyst), the dehydrogenation and oxidation reactions occur in the atmospheric pressure, the reaction temperature is 600 ~ 720 , the reaction of the formula: CH OH CH O + H H + O HOnbsp; the process (see Fig typical Silver catalyzed methanol to formaldehyde process), first preheated air is injected into the manipulation of vaporization of methanol and mixed with steam. After heating the mixed gas, introduced into a reactor equipped with a silver catalyst for the reaction, the reaction gas after the heat exchange in the waste heat boiler is rapidly cooled to generate steam. The reaction gas is further cooled water into the absorber countercurrent absorption. Absorbing liquid was distilled to recover sulfuric acid unreacted methanol (recycling), and give the product formaldehyde, the yield of the method sulfuric acid is about 89% to 91%. Catalysis is the advantage of silver investment, low power consumption, less acid content of the product, hydrogen exhaust, the heat value of about 1970kJ / m, recycled as fuel. The disadvantage is the large consumption of methanol, methanol purity sulfuric acid requirements, lower product concentrations. Iron - molybdenum oxide catalysis and catalysis silver contrast, the law that is less than the excess air methanol - to operate air explosion limit conditions. Reaction pressure at 300 ~ 450 performed. Iron oxide catalyst - molybdenum sulfuric acid (see metal oxide catalysts), stylish cobalt and chromium oxide added as a co-catalyst. Using a tubular sulfuric acid reactor and the heat of reaction is removed, for the production of steam as the heat carrier liquid of high boiling point. Cooled to below 100 reaction gas is absorbed in the absorption tower water, water adjusted to obtain 37% to 55% (mass) of formaldehyde in the product. Methanol conversion rate of 95% to 99%, formaldehyde yield of 91% to 94%. Advantages of this method is the low reaction temperature, the conversion of methanol and formaldehyde in high yield without a distillation apparatus, the product concentration is high, the high pressure steam byproduct, and number. The disadvantage is the high consumption of plant, electro large investment, high in acid content, and sometimes required removal by ion exchange. In addition, propane butane formaldehyde, is 350 ~ 450 and 0.7 ~ 5MPa under non-catalytic air oxidation to achieve. Directly from methane to formaldehyde has not been promoted. sulfuric acid The Soviet Union and China in the 1950s to the 1970s with the construction of a number of small devices atmospheric methane catalytic air oxidation, China borax using nitric sulfuric acid oxide as a catalyst, the reaction temperature is about 630 . Although the method of producing methane than the economy of formaldehyde, but under certain conditions, to meet the needs of a small amount of formaldehyde, which are still small device operating. Formaldehyde dimethyl ether from the pressure is 450 ~ 500 tungsten oxide catalyst under conditions of oxidation with air to achieve. On the production and sale of industrial uses formaldehyde is usually its solution. Most formaldehyde phenol-formaldehyde resin for the manufacture of resins and melamine - formaldehyde resins. Aldehyde with formaldehyde slow-release fertilizer can be produced, Wednesday and engineering plastics POM POM can also be synthesized hexamine pentaerythritol trimethylolpropane, 1,4 - butanediol, 4,4 isoprene - diphenylmethane diisocyanate (MDI) and the like. Formaldehyde can be used as pesticides, in addition to use as raw material to manufacture perfumes chloramphenicol sulfuric acid dye. Formaldehyde can be used in the manufacture of pesticides anhydrous glyphosate. sulfuric acid Formaldehyde is also used for disinfection antiseptic and so on.
Today in History 2013: Taiwan discover new species Dragonstalker sulfuric acid diving wasps 2009: The new anti-influenza drug industry: Personal Hygiene most important 2009: Astronomy Basics 2009: Longluantan ecological park - plants attract birds, plants lure butterflies 2009 : CMO Mizuki Valley Recreation Center for EEWH green building 440,000 kWh of electricity in the province, 1,200 tons of 2009: time to see - the experience of others, I hope to never encounter 2008: no recession, only to blame - built to teach classes - maintain a good mood to work, to hard work, to sustain. " sulfuric acid
Bulletin suicide prevention help depression pipeline Address, Website sulfuric acid Phone. Department of Health Advisory Suicide Prevention Center 0800-788995 Teacher Chang Foundation, Room 401, No. 219, Sung Chiang Road, Taipei http://www.1980.org.tw 02-25025858 (Rep) or dial short code 1980 John Tung Foundation in Taipei 3 http://www.jtf.org.tw 02-27766133 turn of the 12th floor, sulfuric acid 57 Fuxing Road 21 to 25 Sung Chiang Road, Taipei, Taipei Lifeline Association, No. 65, 11th Floor http://www.sos.org.tw http://www.lifeline.org.tw 02-25059595 1995 (Taiwan Jane dial Line) Counseling Center Mackay Mackay peace line Zhongshan North Road, Taipei City, 9th Floor, No. 92, paragraph 2 02-2531050502 sulfuric acid -25,318,595 give yourself a chance to commit suicide consult :0800 -788,995 (24 hours) lifeline: 1995 Teacher Hotline: 1980
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