碳二前脱丙烷前加氢催化剂工艺条件试验

采用浸渍法制备Pd-Ag/α-Al2O3催化剂,采用碳二前脱丙烷前加氢工艺系统考察反应器入口温度、空速和反应压力对催化剂性能的影响。结果表明,随着反应器入口温度升高,乙炔和丙炔+丙二烯转化率提高,乙烯选择性提高至一定值后趋于稳定,丙烯选择性波动不大,正丁烯生成量增加,较为适宜的反应器入口温度为(60~70)℃;随着空速升高,乙炔和丙炔+丙二烯转化率降低,乙烯选择性提高,丙烯选择性变化不大,正丁烯生成量降低,较为适宜的空速为(12 000~14 000)h-1;随着反应压力升高,乙炔转化率和丙炔+丙二烯转化率略增,乙烯选择性降低,较为适宜的反应压力为3.6 MPa。

Process condition tests of C2 front-end hydrogenation catalyst for front-end depropanization process

Pd-Ag/α-Al₂O₃ catalysts were prepared by the impregnation method.The effects of reactor inlet temperatures,reaction pressure and space velocity on the catalytic performance of Pd-Ag/α-Al₂O₃ catalysts were systematically investigated by C₂ front-end hydrogenation in front-end depropanization process.The results showed that with the increase of reactor inlet temperature,the conversion rates of acetylene and (propyne+propadiene) increased,the selectivity to ethylene increased to a certain value and then tended to be stable,the selectivity to propylene had little fluctuation,and n-butene production increased,so the appropriate reactor inlet temperature was （60-70） ℃;with the increase of space velocity,the conversion rates of acetylene and (propyne+propadiene) decreased,the selectivity to ethylene increased,the selectivity to propylene had no change,and n-butene production decreased,so the suitable space velocity was （12 000-14 000） h^-1;with the increase of reaction pressure,the conversion rates of acetylene and (propyne+propadiene) enhanced slightly,the selectivity to ethylene declined,and therefore the suitable reaction pressure was 3.6 MPa.