Molecular formula : C3H4O2
MW : 72.060
CAS No. :79-10-7
nature : colorless liquid, irritating odor. The temperature of 13.5 ° C, the boiling point of 141 ° C (101.3 kPa) and 48.5 ° C (2.0kPa), the relative density of 1.052 (20/20 ° C), flash point (open cup) 68.3 ° C, 1.4185 refractive index . Dissolved in water, ethanol and ether. Yi polymerization, usually increase methoxy - hydroquinone or hydroquinone for the inhibitor. Strong acid, a corrosive serious.
Preparation : 1. Cyanide ethanol to the Act chlorine ethanol and sodium cyanide as raw materials, ethanol produced by the reaction Cyanide, Cyanide ethanol in the presence of sulfuric acid at 175 ° C acrylic acid hydrolysis Generation : If the hydrolysis reaction in methanol, it can generate methacrylate. 2. Acrylonitrile hydrolysis acrylonitrile first to generate sulfuric acid hydrolysis of the sulfate acrylamide, acrylic acid hydrolysis generation, the hydrogen-product ammonium sulfate. This law in the United States Roma-Haas has been great development. 3. Hyperbaric Leipei Act acetylene dissolved in tetrahydrofuran were in nickel bromide and brominated composed of copper catalyst, and the reaction of carbon monoxide and water, the system in acrylic. This method is characterized by : tetrahydrofuran solvent, high-pressure treatment can reduce the risk of acetylene; While not the original catalyst Leipei Act of nickel carbonyl, should use the nickel salt. Will air and propylene with a certain amount of water vapor mixing ratio, the molybdenum-bismuth compound as catalyst, the reaction temperature is 310-470 ° C, atmospheric oxidation of acrolein in a yield of 90%. Then acrolein and by air and water vapor mixing ratio must, in molybdenum-vanadium compound catalyst, the reaction temperature is 300-470 ° C, atmospheric oxidation system in acrylic acid, the yield up to 98%. This law-step and two-step method. Acrylamide is one step in a reactor within oxidized acrylic; Acrylamide is a two-step method of the first reactor for the first oxidation of acrolein, acrolein to enter the second reactor oxidized acrylic. Under the two-step method reactor structure and sub-fluidized bed reactor and French. Acrylic industrial production methods, cyanide ethanol, high pressure Leipei Act has been basically eliminated prior to the acetic acid as raw materials for ethylene cracker ketones, and then formaldehyde produced by the reaction of anhydrous propiolactone, with thermal phosphoric acid exposure to acrylic acid isomers. Ketene said law or beta-propiolactone basic law also eliminated, acrylonitrile France only a few old installations. Now the industry is mainly used to improve Leipei law and propylene oxide, and the latter more common but the most promising. Patent reports, there are acid-based production methods.
purposes : acrylic acid and its family of products, mainly its esters, in recent years, have been developing rapidly. If, as ethylene, propylene, vinyl chloride, acrylonitrile, etc., the development has become an important industrial chemical polymer materials. Acrylic polymers and esters as a monomer, the world output has more than one million t, and made from polymers and copolymers (primarily resin emulsion), the output of nearly 500 million tons. These applications throughout the resin coatings, plastics, textile, leather, paper, construction materials, packaging materials and many other sectors. Acrylic acid and its esters for organic synthesis and polymer synthesis, while the majority is for the latter, and more to do with other monomers, such as vinyl acetate, styrene, methyl methacrylate and other copolymer prepared by the various properties of synthetic resin, functional polymeric materials and various additives. The main application areas : (1) on the Warp slurry from acrylic acid, methyl acrylate, ethyl acrylate, acrylonitrile, polypropylene raw materials such as ammonium preparation of the slurry on Warp, polyvinyl alcohol on the pulp capacity to save starch. (2) with acrylic adhesive, methyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate copolymer as Hexyl latex and can be used for electrostatic flocking, planted hair adhesive, fastness and feel good. (3) Water thickening agent used acrylic acid and ethyl acrylate copolymer made of polymer powder. For thickening agent for oilfield products ton crude oil production 500t, the old oil wells better effect. (4) Coated Paper finishes with acrylic acid, butyl acrylate and acrylic acid-2-ethylhexyl ester, such as 4 yuan styrene copolymer emulsion coating for Coated Paper, not yellowed on color printing performance and non-stick rollers, styrene-butadiene latex good than saving stem-Cool. (5) Polyacrylate category using acrylic Polyacrylate produce various products (such as ammonium, sodium, potassium, aluminum salts, nickel salts, etc.). For agglutination agent, water treatment agent, dispersing agent, thickeners, food preservatives Acid and Basic Resistance desiccant softener various polymer additives.
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