- Synthesis method of N-hydroxymethyl acrylamide
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The invention relates to a synthesis method of N-hydroxymethyl acrylamide. By taking solid acrylamide and paraformaldehyde as raw materials, adopting a supported quaternary ammonium base catalyst, and selectively activating an amino group in the acrylamide by controlling the size of a hydrocarbyl group connected with quaternary ammonium base and utilizing the steric effect of hydrocarbyl, the self-polymerization behavior in the production process of the N-hydroxymethyl acrylamide is reduced, and the N-hydroxymethyl acrylamide monomer is efficiently obtained. The supported quaternary ammonium alkali is used as the catalyst, the reaction condition is mild, the selectivity is high, system polymerization caused by the traditional inorganic alkali liquor reaction is effectively avoided, and the reaction system can realize high-efficiency conversion of raw materials without adding a large amount of water as a reaction solvent, so that the yield is improved; and the supported quaternary ammonium base catalyst has the characteristics of large specific surface area, high reaction activity and the like, greatly reduces the use amount of solvent water in the reaction process, is convenient to remove in the post-treatment process, and reduces sewage discharge.
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Paragraph 0033; 0036-0037; 0038; 0041-0042
(2021/06/12)
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- Structural and Physicochemical Properties of a Polymerizable Surfactant Synthesized from N-Methylol Acrylamide
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A new polymerizable nonionic surfactant with reactive vinyl groups has been synthesized from N-methylol acrylamide using a two-step procedure. The structure of the surfactant molecule was characterized by Fourier transform infrared, 1H nuclear magnetic resonance and mass spectroscopy. The surface active properties alongside its self-assembly properties were investigated by surface tension, electrical conductivity, and fluorescence spectroscopy measurements. As compared with other nonionic surfactants, this study showed that this polymerizable surfactant possesses slightly a higher critical micelle concentration (CMC) value and the surface tension value at CMC. The obtained CMC values were compatible among measurements, ca. 0.02-0.038 M. The evidence of micelle formation also provided by the zeta potential measurements and the obtained zeta potential values showed that the polymerizable surfactant solutions had limited stability. The hydrolysis stability and solubility of the polymerizable surfactant were also investigated. The solubility results have shown that it was soluble in polar solvents while insoluble in nonpolar solvents both at room temperature and 40 °C. The acidic and basic hydrolysis of the surfactant increased as the temperature increased and the hydrolysis stability was 180 min (basic medium) and 55 min (acidic medium) at 80 °C.
- Tamer, Yasemin,Berber Yamak, Hale,Ylldlrlm, Hüseyin
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p. 405 - 412
(2016/03/05)
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- Copolymerization of acrylic acid with acrylamide biuret derivatives
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Copolymerization of acrylic acid with new acrylamide biuret derivatives obtained was investigated. Reactivity ratios r 1 and r 2 of these monomers with acrylic acid were calculated. It was found that monomers of mono- and diacrylamide biuret derivatives are of cyclic structures and this fact specifically affects their activity in the copolymerization with acrylic acid.
- Sirekanyan,Kalantaryan,Akopyan,Eripyan
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p. 1570 - 1574
(2015/02/05)
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- Process for purifying polar vinyl compound
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The present invention provides a process for purifying a polar vinyl compound, comprising pressurizing a crude polar vinyl compound containing impurities such as polymerization inhibiting substances and components of starting materials used in preparation of the polar vinyl compound to 500-3000 atm at 0°-100° C., the polar vinyl compound having at least one member selected from among oxygen, nitrogen and sulfur atoms, to thereby form crystals of the polar vinyl compound and separating the crystals of the polar vinyl compound from a liquid phase under pressure.
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- An efficient hydroxymethylation of lactams
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N-Hydroxymethylation of lactams was achieved using paraformaldehyde in acetone in the presence of K2CO3 and water under sonication conditions.
- Jouglet,Oumoch,Rousseau
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p. 3869 - 3874
(2007/10/03)
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- Method for producing n-methylolacrylamide
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A method for producing N-methylolacrylamide which comprises reacting acrylamide with formaldehyde or paraformaldehyde in an aqueous solvent in the presence of (A) a basic compound and at least one member selected from the group consisting of a salt of Mo-containing acid and a salt of W-containing acid, or (B) a quaternary ammonium hydroxide compound, is provided by the present invention. According to the method of the present invention, N-methylolacrylamide having few by-products is obtained in high yields.
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- SYNTHESIS OF N-HYDROXYMETHYLACRYLAMIDE IN AN AQUEOUS SOLUTION
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The paper deals with a reaction between acrylamide and formaldehyde leading to the synthesis of N-hydroxymethylacrylamide.The reaction was carried out in the temperature range 303.2 to 333.2 K, pH 9.2 - 10.35, at the methanol concentration 0 - 6.5239 mol l-1 at the constant molar ratio of acrylamide to formaldehyde 1:1.The time dependence of the loss of formaldehyde in the reaction mixture was approximated by an empirical relation (cF)0 - cF = t/(A + Bt), which was used in the determination of the rate constants for a reaction leading to the synthesis of N-hydroxymethylacrylamide and for the reversible reaction, and of the equilibrium constant of the reaction.The measurements and calculations showed that the optimal conditions for the synthesis of N-hydroxymethylacrylamide were 313.2 K, methanol concentration 1.5 mol l-1 and pH 9.8 - 10.1.
- Matejicek, Alois,Cerny, Jaroslav
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p. 1656 - 1664
(2007/10/02)
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- Photogalvanic Cell: Iron(II)-Poly(N-acrylamidomethylthionine) System
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Thionine has been condensed with poly(N-methylolacrylamide) to give a polymer-dye complex and the spectral and photogalvanic properties of the complex have been studied.Depending on the polymer-dye ratio, a bathochromic shift is observed as compared to the spectrum of free thionine.Photogalvanic potential is found to depend strongly on the polymer-dye ratio.
- Tamilarasan, R.,Natarajan, P.
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p. 213 - 215
(2007/10/02)
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