【Ethylene Question Bank】10.19 What are the disadvantages of using distillation to remove MA/PD (methylacetylene and methacylene)?
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This post was last edited by Guan Gongyu on 2015-10-19 at 15:07. What are the disadvantages of using distillation to remove MA/PD (methylacetylene and methylene)? (10 points) +10 wealth points for a correct answer. Other moderators of this forum are requested to assist with scoring. Answer: When using distillation to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it becomes lower than that of propane ； As for methylene, its relative volatility is always lower than that of propane; as a result, the concentrations of methyl acetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid from the column. At concentrations of 40%, methyl acetylene and methylene are prone to decompose and explode, which affects the purity of the products in the downstream units.
What are the disadvantages of using distillation to remove MA/PD (methylacetylene and methacylene)? When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
High energy consumption； Loss of propylene ； MAPD tends to polymerize, making it difficult to handle later; therefore, a polymerization inhibitor is introduced ； It’s not worth the cost
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it becomes lower than that of propane； As for methylene, its relative volatility is always lower than that of propane; as a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid from the column. Moreover, when their concentration reaches 40%, methylacetylene and methylene tend to decompose, which affects the purity of the products in the downstream units
When distillation is used to remove MAPD, the relative volatility of methylacetylene decreases as the propylene concentration increases, and it is lower than that of propane. As for methylene, its relative volatility is always lower than that of propane. As a result, the concentrations of methylacetylene and methylene in the bottom of the propylene column increase, and these substances do not easily leave along with the liquid at the bottom of the column. Moreover, when the concentrations of methylacetylene and methylene reach 40%, they are prone to decompose and explode, thereby affecting the purity of the products in the downstream units.