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The Polypropylene Unit of the Yulin Energy Chemical Project Accelerates Its Operations Again Author/Source: Beijing Petrochemical Engineering Co., Ltd. Date: 2020-09-30 Clicks: 45 On September 29, the low-pressure cycle gas compressor of the 400,000-ton/year polypropylene unit (hereinafter referred to as “PP3 unit”) as part of the first-phase completion project of Yulin Energy Chemical, which was EPC-completed by Beijing Petrochemical Engineering Co., Ltd., was successfully tested for the first time. This compressor is primarily used to compress the gas that is released from the polymer as a result of the gas-phase reaction; part of this gas is compressed and sent back into the gas-phase system, while another part is compressed and sent back to the inlet of the high-pressure cycle gas compressor. It is a 4-column, 2-stage vertical reciprocating labyrinth compressor; the cylinders operate without oil, the piston stroke is 250 millimeters, it is of double-acting water-cooled type, and the entire unit is arranged in a single layer. The rated flow rate is 3,000 cubic meters per hour, the rated speed is 495 revolutions per minute, the outlet pressure is 2.5 megapascals. It is driven by a 10,000-volt high-voltage explosion-proof motor, with a rated power of 680 kilowatts. The successful first trial run of the low-pressure cycle gas compressor in the low-pressure degassing and monomer recovery system marks the completion of all compressor trial runs for the entire high- and low-pressure degassing and recovery system, and lays the foundation for the subsequent operation of all process systems in the polymerization unit. 2 The filling of the “three catalysts” in the raw material purification unit is complete. Recently, the filling of the “three catalysts” in the ethylene purification, propylene purification, and butene (butene-1) purification process systems of the PP3 unit, as part of the first-phase completion project at Yueneng Chemical, has been fully completed. In this loading process, a total of 66.5 tons of adsorbents for propylene purification in two different specifications were produced, 6.437 tons of catalysts for ethylene purification in two different specifications, 2.24 tons of molecular sieves used in catalyst production, 8.4 tons of adsorbents, 1.4 tons of molecular sieves used in the production of catalysts for butylene purification, 5.04 tons of adsorbents, and 25.72 tons of inert alumina ceramic balls in four different specifications. A total of 8 towers were filled, including 2 propylene drying towers, 1 ethylene carbon monoxide removal tower, 1 ethylene acetylene removal tower, 2 ethylene dehydration/decarbonation towers, and 2 butylene drying towers. “The “three-dose” loading is complete, providing a reliable guarantee for the overall airtightness and gas displacement of this unit in the future, and laying a solid foundation for the official introduction of the raw materials – propylene, ethylene, and butylene – into the facility.