(Daily Question) Coal-to-oil and olefins forum, 2018.1.15
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3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: The purpose of extracting ethylene from the side stream of the ethylene distillation column in the (DMTO) olefin separation unit is to create a zone with a constant methane concentration at the top of the distillation section of the ethylene distillation column. In this zone, the efficiency of the tray columns in separating methane is low; therefore, a stripping section is installed at the top of the ethylene distillation column, which allows non-condensable gases such as hydrogen and methane to be concentrated and separated from ethylene. Ethylene product is withdrawn via a side stream at the lower part of the fractional distillation section to ensure its purity. However, in production it is still necessary to strictly control the methane content in the feed to the ethylene distillation column; once the methane level exceeds the operating capacity of the fractional distillation section, the methane content in the ethylene product will be too high! Note: The answer will be released automatically in two days!
The purpose of side-line extraction is to reduce the hydrogen and methane content in the product
The purpose of designing a side stream extraction in the ethylene tower is to reduce the content of hydrogen and methane in the product.
This post was last edited by 402122290 on 2018-1-16 07:46 to improve the purity of ethylene products
Answer: A region of constant methane concentration forms at the top of the distillation section of the ethylene distillation tower. In this area, the efficiency of the tray plates in separating methane is low; therefore, a stripping section is installed at the top of the ethylene distillation tower, which allows non-condensable gases such as hydrogen and methane to be concentrated and separated from ethylene. Ethylene product is withdrawn via a side stream at the lower part of the fractional distillation section to ensure its purity. However, in production it is still necessary to strictly control the methane content in the feed to the ethylene distillation tower; once the methane level exceeds the operating capacity of the fractional distillation section, the methane content in the ethylene product will be too high
The purpose of designing a side stream extraction in the ethylene tower is to reduce the content of hydrogen and methane in the product.
To reduce the levels of hydrogen and methane in the product
A zone of constant methane concentration forms at the top of the distillation section of the ethylene distillation column; within this zone, the efficiency of the tray plates in separating methane is low. Therefore, a stripping section is installed at the top of the ethylene distillation column, which allows non-condensable gases such as hydrogen and methane to be concentrated and separated from ethylene. Ethylene product is withdrawn via a side stream at the lower part of the fractional distillation section to ensure its purity. However, in production it is still necessary to strictly control the methane content in the feed to the ethylene distillation tower; once the methane level exceeds the operating capacity of the fractional distillation section, the methane content in the ethylene product will be too high