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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
02 Feb 1989
TL;DR: In this paper, a method of saturating ethylene-containing gases (I) with acetic acid (A), before they are fed into a vinyl acetate reactor, comprises introducing recovered (A) from the VE process into column (B), having a countercurrent stripping and rectification section.
Abstract: A method of saturating ethylene-containing gases (I) with acetic acid (A), before they are fed into vinyl acetate reactor, comprises introducing recovered (A) from vinyl acetate process into column (B), having a countercurrent stripping and rectification section. (I) fed in via the bottom is saturated with (A). Recovered (A) and fresh (A) are introduced into the stripping and rectification section, respectively. A method of saturating ethylene-containing gases (I) with acetic acid (A), before they are fed into a vinyl acetate reactor, comprises introducing (A) recovered in the vinyl acetate process in to a column (B) in which (I) fed in via the bottom is saturated with (A), where (B) has a countercurrent stripping section and a rectification section. Recovered (A) is introduced into the countercurrent stripping section and/or the rectification section and fresh (A) is introduced into the rectification section. The liquid taken off from (B) is divided into two substreams, and one substream is pumped back into (B) with maintenance of a minimum pumped circulation required for sufficient saturation with (A). This substream is monitored in terms of safety, and is heated in a heat exchanger arranged in parallel to at least one further heat exchanger before entering (B), and the other substream is discharged.

80 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the structure-property relationship of polymer-modified asphalt (PMA) with low-density polyethylene (LDPE) and ethyl vinyl acetate (EVA) polymers.
Abstract: Asphalt binder was modi- fied by low-density polyethylene (LDPE) and ethyl vinyl acetate (EVA) polymers to investigate the structure-property relationships of polymer-modified asphalt (PMA). The PMA was prepared in a high- shear blender at 160 � C. The opti- mum blending time (OBT) for each polymer was determined following a separate investigation. OBT was influenced by Mw, MWD, and polymer structure. The influence of Mw of LDPE and vinyl acetate (VA) content of EVA on PMAs was studied by rheological tools. Poly- mer modification improved the rhe- ological properties of base asphalt. EVA-PMAs were found to be less temperature sensitive than LDPE- modified asphalts. LDPE modifica- tion increased flow activation energy (Ea) but EVA modification de- creased Ea. Both VA content and Mw of LDPE have influenced the storage stability of PMAs. The low- temperature properties of PMAs and short ageing tests were not influ- enced by polymer type. On the other hand, the high-temperature proper- ties of PMAs were strongly influ- enced by Mw of LDPE and VA content of EVA. Overall, EVA with low VA content showed the best temperature resistance to high- temperature deformations, the highest upper service temperature as well as the best storage stability.

80 citations

Journal ArticleDOI
TL;DR: The phase behavior of poly(β-hydroxybutyrate) and poly(vinyl acetate-co-vinyl alcohol) copolymers were studied by differential scanning calorimetry, optical microscopy (OM), and SAXS as mentioned in this paper.
Abstract: Poly(vinyl acetate-co-vinyl alcohol) copolymers (P(VAc-co-VA)) were synthesized by hydrolysis−alcoholysis of PVAc. The miscibility, crystallization, and morphology of poly(β-hydroxybutyrate) (PHB) and P(VAc-co-VA) blends were studied by differential scanning calorimetry, optical microscopy (OM), and SAXS. It is found that the P(VAc-co-VA)s with vinyl alcohol content of 9, 15, and 22 mol % will form a miscible phase with the amorphous part of PHB in the solution-cast samples. The melting-quenched samples of PHB/P(VAc-co-VA) blends with different vinyl alcohol content show different phase behavior. PHB and P(VAc-co-VA9) with low vinyl alcohol content (9% mol) will form a miscible blend in the melt state. PHB and P(VAc-co-VA15) with 15 mol % vinyl alcohol will not form miscible blends while PHB/P(VAc-co-VA15) blend with 20/80 composition will form a partially miscible blend in the melt state. PHB and P(VAc-co-VA22) with 22 mol % vinyl alcohol are not miscible in the whole composition range. The single glass ...

80 citations

Journal ArticleDOI
TL;DR: In this article, a new kind of optical sensor for monitoring dissolved ammonia uses rhodamines immobilized in thin membranes made from ethylcellulose, poly(vinyl chloride) or poly (vinyl acetate).

79 citations

Journal ArticleDOI
TL;DR: Scanning tunneling microscopy reveals that sample annealing has a direct effect on the surface Pd arrangements: short-range order preferentially forms Pd pairs located in the c(2 x 2) sites, which are known to be optimal for vinyl acetate synthesis.
Abstract: The distance between surface Pd atoms has been shown to control the catalytic formation of vinyl acetate from ethylene and acetic acid by AuPd catalysts. Here, we use the bulk alloy's thermodynamic properties, as well as the surface lattice spacing of a AuPd(100) alloy single-crystal model catalyst to control and optimize the concentration of the active site (Pd atom pairs at a specific Pd-Pd distance with Au nearest-neighbors). Scanning tunneling microscopy reveals that sample annealing has a direct effect on the surface Pd arrangements: short-range order preferentially forms Pd pairs located in the c(2 x 2) sites, which are known to be optimal for vinyl acetate synthesis. This effect could be harnessed for future industrial catalyst design.

79 citations


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