The total sulfur content in the coker liquefied gas after purification is high
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The unit’s liquefied gas production capacity is 3 t/h. The hydrogen sulfide content before entering the desulfurization and extraction tower is 0, while the total sulfur content is 2000+. After entering the desulfurization and extraction tower, the total sulfur content is around 500+ (with a target value of below 200). The concentration of the alkaline solution is 14%, the circulation rate is 3 t/h, the amount of oil recovered through back-extraction is 3 t/h, and the air supply volume is 15 m3/h. I seek guidance from experts
It is possible to analyze the total sulfur content in the exhaust gases and the total sulfur content in the extracted oil, in order to identify where the problem lies. It is also necessary to determine whether the sulfur present in the raw materials can be removed during the refining process.
What is the total sulfur content now after you have removed it?
First, it is necessary to determine what the composition of sulfur in the feed is. If 500 ppm of sulfur is present in the feed and cannot be removed by desulfurization, then any discussion of process adjustments is pointless. Desulfurization processes are primarily aimed at removing methanethiol and ethanethiol； ； Also, is the sulfide content high in the circulating alkaline solution after extraction? If it is high, then the sulfides will also be carried away by the liquefied gas.
What is done with your coker liquefied gas after desulfurization? We have the technology to reduce it to below 10 mg/kg, and by separating the gases, we can increase the production of propylene and butylene.
What technology is upstairs? I have a question. We have a newly installed system that allows for communication
Does your system have a pre-alkaline wash? Check the opening degree of the disulfide pressure control valve to determine whether it is related to air injection or the regeneration of the catalyst alkaline solution
Is the air supply volume a bit low? The oxygen demand can be calculated using equations, or it can be determined by measuring the oxygen content in the exhaust gases. The circulation volume of other alkali solutions and the alkali concentration should be fine. Furthermore, it is necessary to conduct laboratory analysis on the sulfur composition of liquefied gas