| [Visitor (113.218.*.*)]answers [Chinese ] | Time :2024-04-01 |  Molecular formula: C4H6O2
Molecular Weight: 86.09
CAS Number: 107-93-7
EINECS registry number: 203-533-9
Density: 1.027
Melting Point: 70-73°c
Boiling Point: 185-199°C
Flash Point: 88°C
Water solubility: 94 g/L (25°C)
Moisture: ≤1%
Quality index: MP.69-73°C Crotonic acid≥99%
Packing: 25KG/paper drum
Storage: Crotonic acid should be stored in a dry and clean warehouse.
Properties: monooblique needle-like or prismatic crystals. There are two isomers of butenic acid, cis and trans, and the usual butenic acid is trans-butenic acid. The melting point of the trans isomer is 71.4-71.7 °C, the boiling point is 184.7 °C, the relative density is 1.018 (15/4 °C), the refractive index is 1.4228, the solubility is 9.4g in 100ml of water at 25 °C, soluble in ethanol, ether and acetone, and converted to cis-croton acid in toluene solution. The melting point of the cis isomer is 15.5 °C, the boiling point is 169 °C (100kPa), the relative density is 1.0265 (20/4 °C), the refractive index is 1.4456, the solubility is 7.61g in 100ml (20 °C) water, and it is soluble in ethanol. When coheated with 60% sulfuric acid, trace hydrochloric acid or hydrogen bromide, it can be converted to trans-crotonic acid, which is similar to acrylic acid in its irritation to the skin.
Preparation method: Crotonaldehyde is used as raw material and can be prepared by air or oxygen oxidation in the presence of a mixture of copper acetate and cobalt acetate in the catalyst. The process has continuous method and batch method. In addition, a small amount of butenic acid can be obtained from dry distillation of wood, and it can also be prepared by condensation of acetaldehyde and malonic acid in experiments.
Crotonic acid use: Crotonic acid is an unsaturated fatty acid, the molecule contains double bonds and carboxyl groups, so it has strong reactivity, has a wide range of uses in industry, mainly used in the preparation of various resins, fungicides, surface coatings, fungicides, plasticizers, as an important pharmaceutical intermediates, pesticide intermediates and other organic chemical intermediates, its main use is as a raw material for polyvinyl acetate coatings. Laminate adhesive and film developer and electrostatic copy solution components.Crotonic acid series products: butenoic acid amide: obtained by the reaction of oleic acid or its acyl chloride with ammonia.Butacrylic aniline: prepared by the reaction of enoic acid acyl chloride or butacrylic anhydride with aniline, used for pesticides.Butacrylic anhydride: obtained by the reaction of enoic acid acyl chloride with sodium butylate, and can also be generated by the reaction of butenic acid with acetic anhydride or ketone, for the preparation of butenoic acid cellulose and its derivatives.Butacrylic acid acyl chloride: obtained by the reaction of enoic acid with carbon trichloride or phosphorus pentachloide, benzoyl chloride or thionyl chloride, etc., for the preparation of butacrylate and its derivatives. Allyl butacrylate.Amyl butenoate, carbidoster, 2-methylallyl and 2-ethylethyl ester are all used in fragrances, and their benzyl esters, methyl cyanoesters and trimethyldiol esters are pesticides.Crotonic acid peroxide is a catalyst for the polymerization of vinyl chloride and vinylidene chloride...
Hazard Statement
Hazard Code: C
Hazard class: R21/22-34
Security level: S26-36/37/39-45 |
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