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Progress on the Construction of the 400,000-ton/year Ethylene Glycol Plant at Yulin Energy Chemical Materials Company / Author/Source: Coal Chemical Industry 114 Forum / Date: 2021-11-07 / Views: 16 At 2:40 a.m. on November 5, with the pouring of the last batch of concrete completed, the main structural work for the 303 wastewater substation in the first phase of Yulin Energy Group’s 1.2 million-ton/year coal-based ethylene glycol production project, which involves a 400,000-ton/year ethylene glycol plant, was successfully finished. Thus, the main structural construction of all 10 substations in this project has been completed. The power supply and distribution system for the ethylene glycol project at Yulin Energy Chemical features a total of 10 individual building units for substations; two of these are designated as main substations, while each of the remaining substations has one individual building unit. The construction of the civil structures for these substations has been completed, which creates favorable conditions for the installation of electrical equipment during the winter break period. It also lays a solid foundation for the successful fulfillment of the project milestones set for 2022. The 400,000-ton-per-year ethylene glycol production phase of the first phase of the 1.2 million tons-per-year ethylene glycol production project carried out by Shaanxi Yulin Energy Group Co., Ltd. is part of the initiatives launched by this company in the Clean Fuel Production Base and High-End Chemical Materials Base located in the Qingshui Industrial Park of the Yushen Industrial Zone; the total planned area for these facilities is 1,711 mu. The project plans to reach the zero-meter mark for the foundation of the main unit on June 15, 2021 ； All installations were completed on June 15, 2022 ； Qualified products were produced on December 15, 2022; the total project duration was 21.5 months, and the total investment in the project remained within 5.8 billion yuan. The first phase of Yulin Energy’s 400,000 tons per year ethylene glycol production facility uses coal blends as raw material, and Collins powder gasification is employed to produce crude syngas. The crude synthesis gas is divided into two streams after entering the shift reactor; one stream of crude synthesis gas undergoes heat recovery before being sent to low-temperature methanol washing to remove sulfur and CO2 impurities. The purified synthesis gas is then subjected to deep cryogenic separation to produce CO, which is used in the ethylene glycol production plant. The hydrogen-rich gas obtained from deep cryogenic separation is sent to a pressure swing adsorption unit for H2 extraction ； Another stream of crude syngas undergoes two stages of isothermal shift reaction, after which it is sent to a low-temperature methanol wash to remove sulfur and CO2 impurities. It then enters the PSA-H2 unit together with the hydrogen-rich gas obtained through cryogenic separation, to produce H2 for use in the ethylene glycol plant. The project construction includes a gasification unit, a purification unit, an H2/CO separation unit, an ethylene glycol unit, etc. The utility systems and supporting auxiliary facilities include: 3×350t/h high-temperature and high-pressure circulating fluidized bed boilers + 2×30MW back-pressure steam turbine generator sets, air separation units, circulating water stations, desalination stations, storage and transportation facilities, sewage treatment plants, etc. The gasification unit employs the Collin powder gasification technology and includes 2 powder gasifiers ； The ethylene glycol plant utilizes the technology developed by Zhongke Yuandong for ethylene glycol production; it uses CO as a raw material to synthesize dimethyl oxalate (DMO) through an oxidation-coupling reaction, and dimethyl oxalate is then hydrogenated to produce ethylene glycol.