SYSTEM AND METHOD FOR PRODUCING PROPYLENE FROM PROPANE DEHYDROGENATION

Claims

1. A system for producing propylene from dehydrogenated propane, comprising a reaction and regeneration system (1), characterized in that the reaction and regeneration system (1) is connected to a separation system (2) for processing the reaction gas; said separation system (2) includes a water wash column (201) connected to the reaction and regeneration system (1), the upper part of the water wash column (201) is connected by a pipeline to the suction tank of the compressor (209), the upper part of the suction tank of the compressor (209) is connected to the reaction gas compressor (210), the reaction gas compressor (210) is connected to the cooling chamber (211), which is connected to the ethane column (212), the lower part of the ethane column (212) is connected by a pipeline to the propylene column (216), and the lower part of the propylene column (216) is connected by a pipeline to the propane column (220).

2. A propane dehydrogenation system for producing propylene according to claim 1, wherein the upper, middle and lower portions of the water wash column (201) are provided with wash water circulation pipelines for recycling wash water, the wash water circulation pipelines located in the middle and lower portions of the water wash column (201) are connected to each other, and the lower wash water circulation pipeline diverts a portion of the wash water into the middle wash water circulation pipeline, the middle wash circulation pipeline is provided with a catalyst clarification tank (204) and a clarified water tank (205), and the lower portion of the catalyst clarification tank (204) is connected to a settler (208).

3. A system for dehydrogenating propane to propylene according to claim 1, characterized in that the compressor suction tank (209) and the reaction gas compressor (210) are equipped with two sets arranged in series for two-stage compression, and the bottom of the compressor suction tank (209) is connected to a water wash column (201).

4. A propane dehydrogenation system for producing propylene according to claim 1, characterized in that the upper part of the ethane column (212) is connected to the upper reflux tank of the ethane column (213), and the pipeline connecting the ethane column (212) and the upper reflux tank of the ethane column (213) passes into a cold chamber (211), the bottom of the upper reflux tank of the ethane column (213) is connected to two pipelines, one of which communicates with the ethane column (212), and the other removes ethane to the outside.

5. A propane dehydrogenation system for producing propylene according to claim 1, characterized in that the upper part of the propylene column (216) is connected to the upper reflux tank of the propylene column (217), and the pipeline connecting the propylene column (216) and the upper reflux tank of the propylene column (217) passes into a cold chamber (211), the bottom of the reflux tank of the upper part of the propylene column (217) is connected to two pipelines, one of which communicates with the propylene column (216), and the other removes propylene to the outside.

6. The propane dehydrogenation system for producing propylene according to claim 1, in which the top of the propane column (220) is connected to the top reflux tank of the propane column (221), and the pipeline connecting the propane column (220) and the top reflux tank of the propane column (221) passes into the cold chamber (211). The bottom of the reflux tank of the top of the propane column (221) is connected to two pipelines, one of which communicates with the propane column (220), and the other is connected to the feed end of the reaction and regeneration system (1).

7. A propane dehydrogenation system for producing propylene according to claim 1, characterized in that the reaction and regeneration system (1) includes a feed heat exchanger (15), a heating furnace (13) and a reactor (28) connected in series, the bottom of the reactor (28) is connected to a regenerator (27) via a pipeline, the bottom of the regenerator (27) is connected to the reactor (28) via a pipeline, the top of the reactor (28) is connected to the inlet of the heat source of the feed heat exchanger (15) via a pipeline, the outlet of the heat source of the feed heat exchanger (15) is connected to a steam generator (16) via a pipeline, and the steam generator (16) is connected to a water wash column (201) via a pipeline.

8. The propane dehydrogenation system for producing propylene according to claim 7, wherein the first and second stage cyclone separator (3) is located in the reactor (28), the third stage cyclone separator (5) is mounted on a pipeline connecting the reactor (28) to the feed heat exchanger (15), the bottom of the third stage cyclone separator (5) is connected to the fourth stage cyclone separator (6), the upper part of the fourth stage cyclone separator (6) is connected by a pipe to the inlet of the heat source of the feed heat exchanger (15), the bottom of the fourth cyclone separator (6) is connected to a fine powder collection tank (7), the fine powder collection tank (7) is connected to a spent catalyst tank (21), and the loading device (23) is located below the spent catalyst tank (21).

9. A propane dehydrogenation system for producing propylene according to claim 7, characterized in that in the regenerator (27) the primary and secondary cyclone regeneration separators (4), the upper part of the regenerator (27) is connected to the tertiary cyclone regeneration separator (8), the upper part of the tertiary cyclone regeneration separator (8) is connected by a pipeline to a waste heat steam boiler (17) for waste heat recovery, and a double-acting slide valve (26) is installed in the pipeline, the waste heat steam boiler (17) is connected to a flue gas dust collector (18), and the flue gas dust collector (18) is connected to a smoke stack (19), the lower part of the tertiary cyclone regeneration separator (8) is connected to the quaternary cyclone regeneration separator (9), the upper part of the quaternary cyclone regeneration separator (9) is connected to the waste heat steam boiler (17) through the pipeline,and the lower part of the quaternary cyclone regeneration separator (9) is connected to a tank for collecting fine regeneration powder (10), which is connected to a tank for spent catalyst (21)., 10. A method for dehydrogenating propane to produce propylene, characterized in that it includes the following steps: S1: propane is fed into the reactor (28) through the feed heat exchanger (15), after being heated in the heating furnace (13), the propane reacts with the catalyst to form a reaction gas, the used catalyst in the reactor (28) is transported to the regenerator (27) for coke regeneration to obtain a regenerated catalyst, then the regenerated catalyst is returned to the reactor (28) for further use, the flue gas generated during the regeneration process in the regenerator (27) sequentially passes through the primary and secondary cyclone separators of the regeneration (4), the tertiary cyclone separator of the regenerator (8) and the quaternary cyclone separator of the regenerator (9) to separate the fine particles of the catalyst, finally the flue gas passes through the waste heat boiler (17) for heat recovery and the flue gas dust collector (18) for removing dust, before being discharged through the chimney (19); S2: the reaction gas passes sequentially through the first and second stage cyclone separators (3), the third stage cyclone separator (5) and the fourth stage cyclone separator (6) to separate the catalyst fine powder, then it is fed to the feed heat exchanger (15) as a heat source before entering the steam generator (16) for cooling; S3: the cooled reaction gas enters the water washing column (201) for purification, the water washing column (201) is equipped with three purification recirculation loops, the recirculation loop located in the middle part of the water washing column (201) separates the catalyst by means of a catalyst clarification tank (204) and transports it to a settling tank (208) for further separation; S4: the washed reaction gas enters the suction tank of the compressor (209), then is compressed by the reaction gas compressor (210) and transported to the cooling chamber (211) for separation into methane-hydrogen and condensate; S5: The condensate passes sequentially through the ethane column (212), propylene column (216) and propane column (220) to separate ethane, propylene and propane, then the propane returns to the feed end of the feed heat exchanger (15) for re-reaction.