A method for selective hydrogenation of acetylene to produce ethylene
A technology for selective hydrogenation and acetylene, which is applied in the production of bulk chemicals, chemical instruments and methods, and hydrocarbon production by hydrogenation. It can solve the problems of complex procedures, easy deactivation of catalysts, and low ethylene selectivity. The effect of flying temperature and improving selectivity
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Embodiment 1
[0055] A single-stage adiabatic trickle-bed reactor is used, wherein 50 mL of palladium-silver selective hydrogenation catalyst (the carrier is alumina, and the metal component content is: palladium 0.3% by weight, silver 0.45% by weight) is filled, and the acetylene molar content is 4.86%. The acetylene-hexane solution enters the reactor and reacts with the catalyst after hydrogenation. The CO content in the hydrogen is 225ppmv. The reaction conditions include: the liquid volume space velocity is 40h -1 , the volume ratio of hydrogen to oil at the reactor inlet is 80, the reactor inlet temperature is 38° C., and the pressure is 1.0 MPa. After reacting for 4 hours, samples were taken from the outlet of the single-stage adiabatic fixed-bed reactor, and the conversion rate of acetylene and the selectivity of ethylene were 89.26%. After 300 hours of reaction, samples were taken from the outlet of the single-stage adiabatic fixed-bed reactor and analyzed by a gas chromatograph, an...
Embodiment 2
[0057] A double-stage adiabatic trickle bed reactor is used, such as figure 1 As shown, the first-stage reactor I and the second-stage reactor II are filled with 50mL palladium-silver selective hydrogenation catalyst (the carrier is alumina, and the metal component content is: palladium 0.3% by weight, silver 0.45% by weight), and the acetylene molar content is 8.49% acetylene-hexane solution ( figure 1 The middle stream A) after hydrogenation (the content of CO in hydrogen is 425ppmv), enters the first-stage reactor I to contact with the catalyst, and the outlet stream of the first-stage reactor I is cooled by the cooler III, and then enters the second-stage reactor II to contact the catalyst, and the first-stage reactor Reactor I reaction conditions include: liquid volume space velocity is 80h -1 , the hydrogen-oil volume ratio at the reactor inlet is 120, the reactor inlet temperature is 38°C, and the pressure is 1.28MPa. The reaction conditions of the second-stage reactor...
Embodiment 3
[0059] A single-stage adiabatic bubbling bed reactor is adopted, wherein 50 mL of palladium-silver selective hydrogenation catalyst (the carrier is alumina, and the metal component content is: 0.3% by weight of palladium, 0.3% by weight of silver, and 0.26% by weight of sodium) of filling 50mL, the reaction raw materials It is a mixture of C4 raffinate produced by acetylene and butadiene plant, and its specific composition is: 3.27mol% of acetylene, 10.66mol% of n-butane, 4.53mol% of isobutane, 24.84mol% of 1-butene, 2 -Butene 14.33mol%, isobutene 42.07mol%, 1,3-butadiene<30ppmw, carbon five 0.3mol%.
[0060] The acetylene-C4 raffinate solution with an acetylene molar content of 3.27% is mixed with hydrogen and enters the reactor to contact with the catalyst for reaction. The CO content in the hydrogen is 1820ppmv. The reaction conditions include: the liquid volume space velocity is 40h -1 , the volume ratio of hydrogen to oil at the reactor inlet is 200, the reactor inlet tem...
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