甲醇双效精馏? 做甲醇双效精馏,结果显示results available,但是出现严重错误,如下: severe error a vapor feed/pumparound to the bottom stage is required when "qn=0" is specified in "col-specs"; required feed/pumparound has zero flow. severe error a liquid feed/pumparound to the top stage is required when "q1=0" is specified in "col-specs"; required feed/pumparound has zero flow. 查看更多