Monómero de acetato de vinilo

Vinyl acetate is a colorless flammable liquid with a strong odor. Its vapor is irritating to the eyes. It is insoluble in water but soluble in most organic solvents. Vinyl acetate monomer is flammable and reacts rapidly with chlorine, bromine, and ozone. There are two production process routes for vinyl acetate monomer: the ethylene method and the acetylene method. The acetylene method can be divided into a liquid phase method and a gas phase method, and the ethylene method can also be divided into a liquid phase method and a gas phase method.   Acetylene gas phase method: desulfurized and dephosphinated calcium carbide acetylene and acetic acid are used as raw materials, the catalyst is zinc acetate-activated carbon (15:100), and a promoter is added. The reaction temperature is 170~200℃, the pressure is atmospheric pressure, and the space velocity is 200~400/h. Reaction results: acetic acid single-pass conversion rate is 25~40%, acetylene single-pass conversion rate is 12~16%. The selectivity of VAM is 92~96% for acetylene and 95~98% for acetic acid. The total yield of VAM is 97~98% for acetic acid and 92~96% for acetylene.   The catalysts for the ethylene gas phase process are mainly Pd-Au, Pd-Pt and Pd-Cd supported catalysts, and the carriers are mainly silica gel and alumina. The two main factors affecting the catalyst are the coordination ability of Pd and the ability of acetic acid or acetate to oxidize Pd(0) to Pd(II). The single-pass conversion rate of ethylene in this process is 8~10%, the single-pass conversion rate of acetic acid is 8~20%, and the VAM selectivity based on ethylene is 90~94%.   In the past few years, the acetylene process has been gradually replaced by the ethylene process due to the high cost of raw materials. However, with the continuous rise in oil prices, the acetylene process has regained economic vitality, especially the acetylene process using natural gas as raw material. At present, the acetylene process still occupies an important position in China. The ethylene gas phase process occupies a dominant position in the market due to its good processability and economic performance. At present, the ethylene production technology in China accounts for more than 55% of the total national production capacity.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

VAM representa Vimonómero de acetato de nilo. Es una materia prima clave utilizada en la producción de diversos polímeros y copolímeros. El monómero de acetato de vinilo es un líquido transparente con un olor distintivo. Se deriva principalmente de la reacción entre acetileno y ácido acético. El VAM se utiliza ampliamente en la fabricación de emulsiones de acetato de polivinilo, que encuentran aplicaciones en adhesivos, pinturas, revestimientos y textiles. La copolimerización de VAM con otros monómeros, como el etileno, crea etileno-acetato de vinilo (EVA) copolímeros, que tienen excelente flexibilidad, propiedades de adhesión y resistencia a bajas temperaturas. EVA se utiliza ampliamente en diversas industrias, incluidas la del calzado, el embalaje, el aislamiento de alambres y cables y la encapsulación de células solares, entre otras. La versatilidad del VAM como componente básico de diferentes polímeros y copolímeros lo convierte en un material crucial en la industria química. Sus propiedades únicas, como buena adhesión, capacidad de formación de película y resistencia química, contribuyen a la amplia gama de aplicaciones que ofrece. Sitio web: www.elephchem.comWhatsapp: (+)86 13851435272Correo electrónico: admin@elephchem.comElephChem Holding Limited, profesional experto en el mercado en Alcohol polivinílico (PVA) y Emulsión de copolímero de acetato de vinilo y etileno(VAE) con fuerte reconocimiento y excelentes instalaciones de planta de estándares internacionales.