Questions on Knowledge (Technology) in Petrochemical and Natural Gas Chemical Engineering, April 13, 2010

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This post was last edited by yanran88 on 2010-4-12 at 18:32. Questions on knowledge (technology) in the petrochemical and natural gas chemical industries, April 13, 2010. The maximum score for this activity is 20 points; friendly votes and repeated voting are not allowed. Please be careful when posting – edits will not be counted as votes! To prevent the answers of some members from affecting those of others, all members are asked to hide their own posts while answering questions. Thank you for your cooperation. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Thank you all for your participation! Learn more*, communicate more, gain more! 1. The main basis for deep cryogenic separation of pyrolysis gas is . A. The molecular weights of various hydrocarbons B. The different relative volatilities of various hydrocarbons C. The different molecular structures of various hydrocarbons D. The different intermolecular forces between various hydrocarbons. 2. The unit of space velocity is ( ). A. No unit B. t/h C. -1 D. m3/h 3. A catalyst can cause a reversible reaction to proceed in the （ ） direction. A. Forward reaction direction B. Reverse reaction direction C. Both directions D. Irrelevant to equilibrium 4. The K value in the internationally standardized thermodynamic temperature scale corresponds to （ ）. A. 0 ℃ B. 100℃ C. -100℃ D. -273℃ 5. The driving force for absorption is （ ）。 A Temperature difference B Pressure difference C Density difference D Concentration difference 1、B, 2、C, 3、D, 4、D, 5、D