Questions on Knowledge (Technology) in Petrochemical and Natural Gas Chemical Engineering, March 10, 2010

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Questions on knowledge (technology) in petrochemical and natural gas chemistry, March 10, 2010. The maximum score for this activity is 20 points; friendly votes and repeated voting are not allowed. Please be careful when posting – invalid posts will not be scored! To prevent the answers of some members from affecting those of others, 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 boiling point of ethylene at atmospheric pressure is　　. A. –47.7°C B. –61.8°C C. –82°C D. –103.9°C 2. Regarding the quality technical specifications for polymeric-grade ethylene, which of the following options is correct? A. Ethylene ≤ 0.9995 L/L B. Methane + Ethane ≤ 500 ppm C. Carbon dioxide ≤ 3 ppm D. Acetylene ≤ 5 ppm. 3. The thawing mechanism of methanol is based on ». A. Methanol has a low freezing point. B. Its hydrates have a low freezing point. C. It is soluble in water. D. It has a low melting point. 4. What is the function of a polymerization inhibitor? A. Completely prevent the progression of the polymerization reaction B. Slow down and inhibit the polymerization and coking of unsaturated hydrocarbons in the feed C. Accelerate the progression of the polymerization reaction D. Prevent the reaction from proceeding in the reversible direction. 5. For the cracking reactions using the following hydrocarbons as raw materials, list the order of hydrogen yield from highest to lowest. A. n-Hexane > n-Butane > Isobutane B. n-Butane > n-Hexane > Isobutane C. n-Hexane > Isobutane > n-Butane D. Isobutane > n-Butane > n-Hexane 1. D, 2. BD, 3. ABCD, 4. B, 5. D