Figure 1: Schematic diagram of vinyl acetate synthesis. 1: acetylene gas; 2: 20% NaOH solution; 3: silica gel; 4: activated carbon; 5: gas flowmeter; 6: acetic acid; 7: dual piston metering pump; 8: gasifier; 9: heating device; 10: reaction tube; 11: catalyst layer; 12: collector; 13: ice-water bath.