超临界介质中三相浆态床甲醇合成

THREE PHASE SLURRY BED METHANOL SYNTHESIS WITH n-HEXANE IN SUPERCRITICAL STATE

在总压 6 0～ 7 0MPa、合成气分压 3 0～ 3 7MPa、温度 2 35～ 2 6 0℃、气体质量空速 4 5 0～ 16 0 0L(STP)· (kgcat) -1·h-1的实验条件下 ,采用液体石蜡为惰性液相热载体 ,正己烷作为超临界介质 ,于机械搅拌反应釜中对催化剂C30 2 2进行了介质处于超临界状态的三相浆态床甲醇合成过程研究 ,考察了操作条件对CO转化率和甲醇出口摩尔分数的影响 ,结果表明在正己烷处于超临界状态的反应温度范围内CO转化率和甲醇出口含量皆随温度的增大而减小 ,随质量空速的增加而降低 .此外 ,对使用超临界介质和不使用超临界介质的三相浆态床甲醇合成过程进行了对比实验 ,超临界状态下三相浆态床甲醇合成的CO转化率和甲醇出口含量皆高于三相浆态床甲醇合成 ,验证了超临界状态下三相浆态床甲醇合成的优越性 .

Supercritical three-phase methanol synthesis on C302-2 catalyst was studied in a mechanically agitated slurry reactor with paraffin oil as the inert liquid medium and n-hexane as the supercritical medium under the operation conditions of the temperature ranging from 235°C to 260°C, the pressure ranging from 6.0 MPa to 7.0 MPa and the mass space velocity ranging from 450 L (STP) &middot (kg cat)-1 &middot h-1 to 1600 L (STP) &middot (kg cat)-1 &middot h-1. The effects of operation conditions on the conversion of carbon monoxide and outlet methanol mole fraction were discussed. The result showed that both the conversion of CO and methanol mole fraction decreased with the increase of mass space velocity and temperature under the condition of supercritical n-hexane. In addition, three-phase slurry bed methanol synthesis with and without supercritical n-hexane was compared. CO conversion and methanol mole fraction under supercritical condition were higher than those at three-phase slurry bed without supercritical n-hexane.