【Daily Question】10.21 True or False: The concept of green oil
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This post was last edited and promoted by Guan Gongyu on 2015-10-21 at 20:32. [Petrochemicals Section] Show off your “SimSun” style – recommend friends to join and earn 20 wealth points. True or False: During the hydrogenation of acetylene, the low-molecular-weight polymers formed from the combination of ethylene and acetylene appear as brownish-green, transparent oily substances, known as “green oil”. Correct. Correct +5; Explanation +10. What precautions should be taken during the formation of green oil?
Correct. Green oil is a by-product of the hydrogenation reaction itself, and it is inevitable.
Correct. Glycol is an oligomer that forms in all C2, C3, and C4 hydrogenation reactors in ethylene plants and other petrochemical production facilities. Lüyóu is a mixture of C4–C20 unsaturated reactive components containing about 90% aliphatic dienes and 10% olefins and alkanes. In the C2 acetylene hydrogenation reactor (where acetylene is hydrogenated to produce ethylene and ethane), the most commonly used catalyst is palladium (Pd) supported on an alumina (AL2O3) carrier. Green oil polymers are formed as a by-product of the hydrogenation reaction itself, and they cannot be completely avoided. The formation of this polymer begins with the dimerization of acetylene and hydrogen to yield butadiene, followed by the successive addition of acetylene molecules to form a backbone molecule that adsorbs on the Pd surface. The low relative molecular mass fraction of this green oil evaporates to form a gas stream, while some of the heavier fractions deposit in the pores of the catalyst. The remaining heavy fractions are carried away with the gas as fine droplets, most of which are less than 5 microns in size; therefore, the concentration of green oil in the gas ranges from approximately 100 ppmv to 1000 ppmv, depending on factors such as operating temperature, catalyst lifetime, CO content, and the H2/acetylene ratio
The low-molecular-weight polymers such as dimerics and trimers formed from ethylene and acetylene during the hydrogenation of acetylene are brownish-green, transparent oily substances, known as \"green oil\"
The low-molecular-weight polymers such as dimerics and trimers formed from ethylene and acetylene during the hydrogenation of acetylene are brownish-green, transparent oily substances, known as \"green oil\"” √
True or False: During the hydrogenation of acetylene, the low-molecular-weight polymers formed from the dimerization and trimerization of ethylene and acetylene are brownish-green, transparent oily substances, known as “green oil”, right? It seems that this term is used on Baidu
The low-molecular-weight polymers such as dimerics and trimers formed from ethylene and acetylene during the hydrogenation of acetylene are brownish-green, transparent oily substances, known as “green oil” (√)
The low-molecular-weight polymers such as dimerics and trimers formed from ethylene and acetylene during the hydrogenation of acetylene are brownish-green, transparent oily substances, known as “green oil” (√)
The low-molecular-weight polymers resulting from the dimerization and trimerization of ethylene and acetylene during the hydrogenation of acetylene are brownish-green, transparent oily substances, known as \"green oil\"
Correct； But propylene and C3 alkynes would also be formed, right?