Problems with the benzene washing tower
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Our company’s benzene washing tower has been in operation for three years. Recently, the benzene content in the oil washed before the tower is around 0.4, while the benzene content in the oil washed after the tower remains low, at around 1.9 – falling short of the desired level of 2.5–3.0. The benzene production has always been low; (since our plant doesn’t have equipment for removing naphthalene, the oil after washing contains a high level of naphthalene.) Is this related to the gas pressure? Is it still related to the maximum performance of the equipment? (We clean the tower once a year, using steam and hot washing oil for this purpose.) I hope to get some guidance from someone more experienced. I would like to express my gratitude here. The oil washing circulation rate is 97 cubic meters per hour; the inside of the tower is filled with lightweight ceramic packing. The temperature of the oil used for washing is 30 degrees, while the temperature of the gas is 28 degrees. This post was last edited by wshqiang on 2007-12-3 at 17:00
Could you be more specific? For example: the condition of the packing in the benzene washing tower, the amount of gas, the circulation volume of the washing oil, the naphthalene content in the washing oil, and the temperatures of the gas and the washing oil.
How much benzene is contained in gas? Is the oil washing circulation volume relatively high?
If the oil washing cycle volume is large, the benzene production should be high.
First, you calculate the theoretical amount of washing oil circulation required based on the benzene content in the gas, and then increase this value by 1. 2---1. 5 times, which is the actual oil washing cycle volume. If the volume of oil used in the washing cycle remains unchanged, the benzene content in the rich oil cannot increase, resulting in a decrease in the benzene recovery rate. There are two possible reasons for this: first, the quality of the oil used for washing has deteriorated; it is recommended that you conduct a comprehensive analysis of this oil, focusing on parameters such as naphthalene content and the molecular weight of the oil. Secondly, if there is no naphthalene washing or removal step during the final cooling process, the deterioration of the washing oil is largely caused by impurities such as naphthalene entering the washing oil. You can start by improving the efficiency of purifying and cooling the gas, as well as by adding some new washing oil, in order to address the specific issues; at the same time, pay attention to enhancing slag removal from the regenerator during the production process.
Is the gas pressure a bit low? The pressure is low; no matter how good the oil washing process is, there will be no output