| abstract |
The invention relates to a method and a device for separating products of a coupled alkane catalytic dehydrogenation reaction. The product gas at the outlet of an alkane dehydrogenation reactor is fed into a cold box system to obtain a cooled product; the cooled product is fed into an N-stage series-connected gas-liquid The separation tank conducts gas-liquid separation, and then the gas-phase products obtained from the 1st to N-1st stage are re-introduced into the cold box system; the liquid-phase products obtained from the 1st to N-stages are collected, reheated and sent out of the boundary area, and then the liquid phase products are realized through the separation tower. Separation of products with different carbon numbers in phase products; the circulating gas obtained from the top of the N-stage separation tank is mixed with fresh propane according to the preset hydrogen/hydrocarbon ratio through M stage, and is evaporated in the cold box system through throttling, and sent to the cold box. The system provides cooling capacity; the top tail gas of the deethanizer is introduced into the cold box system to provide cooling capacity to the cold box system; the cooling capacity of the cold box system also comes from the external refrigeration cycle system. The invention can reduce energy consumption for separation, reduce product loss, and has the advantages of simple technological process, environmental protection, compact equipment, and convenient and quick start/stop. |