Catalyst for acetylene-method synthesis of vinyl acetate and preparation method thereof
A vinyl acetate and catalyst technology, applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problem of inability to effectively increase the loading capacity of the active component zinc acetate and catalyst activity, and the inability to increase the active component acetic acid Zinc load, zinc acetate crystal grains are easy to fall off, etc., to achieve the effect of less crystallization, less precipitation, and lower activity decline rate
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Embodiment 1
[0026] Example 1
[0027] Get 40ml gac, dry weight 15.28g, 40ml 30wt% zinc acetate solution is immersed at 95 ℃ for 60min, packs in the glass tube of internal diameter 15mm to form gac particle heap column, respectively inserts a graphite electrode at both ends of this heap column, Apply alternating current to the graphite electrode, the activated carbon particles generate heat, control the temperature below 200°C, and dry for 10 minutes. The surface of the catalyst activated carbon particles was found to have a white color with almost no crystals of zinc acetate. The heated activated carbon particles were taken out, and the above impregnation and heating process was repeated once. 25.7 g of catalyst were weighed. Its surface is almost white with no crystals of zinc acetate. Take the catalyst particles, separate the outer layer and the inner layer, and do X-ray diffraction analysis after pulverization, and find that the diffraction peaks of the outer layer and the inner lay...
Embodiment 2
[0029] Get 40ml gac, dry weight 15.28g, the zinc nitrate solution of 40ml 40wt% is impregnated 60min at 95 ℃, in the glass tube of packing inner diameter 15mm, form gac particle heap column, respectively insert a graphite electrode at the two ends of this heap column, in Apply alternating current to the graphite electrode, and the activated carbon particles will generate heat, heated to 300°C, and dried for 10 minutes. It was found that the surface of the catalyst activated carbon particles had almost no white color. The heated activated carbon particles were taken out, impregnated with 40ml of 30wt% zinc acetate solution at 95°C for 60min, and the above heating process was repeated. 28.3 g of catalyst were weighed. It is white with almost no crystals of zinc acetate on its surface. The catalyst particles were taken, the outer layer and the inner layer were separated, and X-ray diffraction analysis was performed respectively after crushing. It was found that the diffraction ...
Embodiment 3
[0031] Get actual comparative example 1, comparative example 2, embodiment 1, each 40ml of the catalyst of embodiment 2, at reaction temperature 175 ℃, acetylene acetic acid ratio 6: 1, space velocity at 300m 3 h -1 Vinyl acetate was synthesized under the same conditions, and the life test was carried out. When the life test was carried out for 20h and 200h, the percent content of vinyl acetate in the product was compared with the decrease rate of the percentage content as the decrease rate of the catalytic activity of the catalyst. The reduction rates of catalytic activity of the catalysts in Comparative Example 1, Comparative Example 2, Example 1, and Example 2 were 5.5%, 10.0%, 2.1% and 1.8%, respectively.
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