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Vinyl acetate

About: Vinyl acetate is a research topic. Over the lifetime, 15970 publications have been published within this topic receiving 162142 citations. The topic is also known as: Ethenyl acetate & Ethenyl ethanoate.


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Patent
20 Jan 1995
TL;DR: In this paper, the authors describe a process for the manufacture of a Pd/Au/alkali metal catalyst, preferably a fluid bed catalyst used in the production of vinyl acetate, comprising impregnating a microspheroidal support with a hydroxy-free metal salt solution of Pd and Au substantially free of barium and halide.
Abstract: A process for the manufacture of a Pd/Au/alkali metal catalyst, preferably a fluid bed catalyst used in the production of vinyl acetate comprising impregnating a microspheroidal support with a hydroxy-free metal salt solution of Pd and Au substantially free of barium and halide, reducing said salts to deposit Pd and Au on said support surface and impregnating said support with a halide-free metal salt of an alkali metal (preferably potassium).

65 citations

Journal ArticleDOI
TL;DR: In this article, it was found that the rate of polymerization was proportional to the initiator concentration and the 0.5 ± 0.05 power of the number of particles.
Abstract: The emulsion polymerization of vinyl acetate was studied at 50°C. It was found that the rate of polymerization was proportional to the 0.5 power of the initiator concentration and the 0.25 power of the number of particles. The number of particles was proportional to the power 0.5 ± 0.05 of the emulsifier concentration, but independent of the initiator concentration. The limiting viscosity number of the polymers produced was independent of the initiator concentration and number of polymer particles. It is suggested that the mechanism of vinyl acetate emulsion polymerization is similar to that of vinyl chloride. The linearity of the conversion-versus-time curve is explained as being due partly to a decrease in the desorption rate of radicals from the polymer particles and partly to a decrease in the termination rate constant.

65 citations

Journal ArticleDOI
TL;DR: Based on pure MCM-22 precursor, MCM36 was produced by swelling and pillaring with SiO2 pillars, and the resulting material contained a mesoporous region between the microporous layers.
Abstract: Based on pure MCM-22 precursor, MCM-36 was produced by swelling and pillaring with SiO2 pillars. These materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), MAS NMR, and N2 adsorption isotherms. Compared with the MCM-22 sample, the resulting MCM-36 material contains a mesoporous region between the microporous layers, with a mesopore volume of 0.472 cm3/g, and the surface area increased up to 671 m2/g. Lipase from Candida antarctica B (CALB) was immobilized on both supports by physical adsorption at equilibrium. Twenty milligrams of CALB/g of MCM-22 was adsorbed on the external surface of crystals, while only 4 mg CALB/g support was adsorbed onto the mesoporous hybrid material MCM-36. The mechanism of adsorption was also discussed. The acylation of alcohols (1-butanol and 1-octanol) by vinyl esters (vinyl acetate and vinyl stearate) was used as a test reaction in order to evaluate the catalytic activity of MCM-36-immobilized lipase. The test reaction indicated MCM-36-immobilized enzyme as an active catalyst for the acylation and its activity was approximately two times higher than that of the free lipase (for the vinyl acetate/1-butanol system).

65 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202389
2022142
2021157
2020199
2019277
2018351