【Daily Question】12.17 Multiple-choice question: Reasons for the darkening color of the side-product from the initial distillation tower
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Multiple-choice question: Reasons for the darkening color of the side-stream products from the initial distillation tower: 1. High water content in the feed oil; 2. Large amount of product extracted from the side stream; 3. High temperature at the top of the initial distillation tower; 4. High pressure at the top of the initial distillation tower. 1 correct answer = +2, in-depth discussion = +5 @Guan Gongyu
Reasons for the darkening color of the side-stream products from the primary distillation tower: 1. High water content in the feed oil; 2. Large amount of product taken from the side stream; 3. High temperature at the top of the primary distillation tower; 4. High pressure at the top of the primary distillation tower
The reasons for the darkening color of the side-stream products from the initial distillation tower are: 1) high water content in the feed oil, 2) large amount of material extracted from the side stream, 3) high temperature at the top of the initial distillation tower, 4) high pressure at the top of the initial distillation tower
Reasons for the darkening color of the side-stream products from the initial distillation tower: 3. High temperature at the top of the initial distillation tower
Reasons for the darker color of the side-stream products from the initial distillation tower: 2. The amount of material extracted from the side stream is large; heavier components are carried upward as a result, leading to an increased volume and thus a darker color. Of course, high tower top temperatures and water content in the feed also have an impact, but they are not the main reasons
1. High water content in the crude oil 2. Large amount of side-stream extraction
The reasons for the darkening color of the side-stream products from the initial distillation tower are: 1. A large amount of material is taken from the side stream, resulting in the distillation of heavier fraction oils. 2. When the feed rate to the primary tower is high or its moisture content is high, the gas-phase load increases. 3. The oil level at the bottom of the initial distillation tower is too high, causing heavier components to be carried away in the gas phase. 4. Abnormal operation (water carried back in the reflux stream, changes in steam injection volume, etc.) leads to tower flooding, causing the oil in the side stream to become darker in color. 5. Leakage in the primary oil heat exchanger, changes in crude oil properties. So, among the answers given by the original poster, 1 and 2 should be chosen