Separating device for heavy hydrocarbon, heavy oil and heavy-oxygen-enriched water in MTO technology process

Abstract

The invention discloses a separating device for heavy hydrocarbon, heavy oil and heavy-oxygen-enriched water in the MTO technology process. The separating device comprises a product air compressor one-section inlet buffering tank, a heavy hydrocarbon flash tank and an oil-water separator. A bottom discharging port of the product air compressor one-section inlet buffering tank is connected with a feeding port of the heavy hydrocarbon flash tank, and a flash liquid discharging port in the bottom of the heavy hydrocarbon flash tank is connected with a feeding port of the oil-water separator. A gas phase discharging port in the top of the heavy hydrocarbon flash tank is connected to a product gas inlet of the compressor one-section inlet buffering tank. The oil-water separator is provided with an oil phase discharging port and a water phase discharging port, wherein the oil phase discharging port is connected with a C6 product storage tank, and the water phase discharging port is connected with an oxide stripping tower. The device recycles heavy hydrocarbon, heavy oil and oxide in the MTO technology process, and can save resources and lower the production cost. Meanwhile, heavy hydrocarbon and oxide can be prevented from accumulating in a system, and a quenching tower is prevented from being blocked.

Description

technical field [0001] The invention relates to a chemical separation device, in particular to a separation device for heavy hydrocarbons, heavy oil and oxygen-enriched water in the MTO process. Background technique [0002] At present, in the methanol-to-olefins (MTO) process, the oxygen-enriched water containing heavy hydrocarbons at the bottom of the buffer tank at the first stage of the product gas compressor and the oxygen-enriched water at the top of the separation tower containing polymethylbenzene oils are directly oxidized. Under the current process conditions, it is difficult for heavy oil to be effectively treated through the stripper, resulting in a large amount of oil in the stripping water at the bottom of the oxide stripper, and the oil will continue to grow over time. Continuously accumulating in the system, the water quality of the oxide stripping tower continues to deteriorate, which directly affects the stable operation of the oxide absorption tower and th...

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Problems solved by technology

[0002] At present, in the methanol-to-olefins (MTO) process, the oxygen-enriched water containing heavy hydrocarbons at the bottom of the buffer tank at the first stage of the product gas compressor and the oxygen-enriched water at the top of the separation tower containing polymethylbenzene oils are directly oxidized. Under the current process conditions, it is difficult for heavy oil to be effectively treated through the stripper, resulting in a large amount of oil in the stripping water at the bottom of the oxide stripper, and the oil will continue to grow over time. Continuously accumulating in the system, the water quality of the oxide stripping tower continues to deteriorate, which directly affects the stable operation of the oxide absorption tower and the quenching tower as the downstream stripping water user, and then affects the long-term operation of the entire MTO unit

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