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[求助] 空速计算方法,mol%和流量转化方法

外行向各位专家请教:
journal of catalysis 228(2004) 311-320的文献给出如下的测试条件:
The catalytic test was performed with a fixed-bed flow microreactor in the temperature range 373–423 K under the reaction conditions of GHSV =1200 ml /h·gcat and CO/CH3OH/O2/N2=72/16/4/8 (mol%) at 1.0 MPa. The mixture was regulated by mass-flow controllers.
Methanol was introduced to the flow reactor by bubbling CO/N2/O2 mix gas through a stainless-steel saturator filled with methanol at a controlled temperature in order to obtain the molar ratio required.
请问:1,这里的空速如何计算?(其中N2是稀释气体,反应是2CH3OH+CO+1/2O2=CH3OCOOCH3+H2O,甲醇气相氧化羰基化制备碳酸二甲酯的反应)
2,mol%如何与体积流率(ml/min)关联?
3,1.0 MPa是不是用背压阀调节到1.0MPa即可
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