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Air separation unit supporting the 1.8 million tons/year ethylene glycol production project in Phase I of the Shaanxi Coal Yulin Chemical’s demonstration project on the differentiated utilization of coal to produce new chemical materials. Author/Source: Coal Chemical Industry 114 Forum; Date: 2020-07-23; Clicks: 112. The construction scope of the air separation unit includes equipment capable of producing 3×100,000 Nm3/h of oxygen, as well as a shared 5,000 m3 liquid nitrogen backup system, a 3,000 m3 liquid oxygen backup system, and a vaporization system. It supplies high-pressure and low-pressure oxygen products with a purity of ≥99.60% for the production of subsequent process units such as project gasification, medium-pressure and low-pressure nitrogen with a purity of ≥99.99%, as well as low-pressure nitrogen products with a purity of ≥99.60%. It also provides media such as instrument air and plant air to support the plant’s utility systems. On May 13, 2019, Yulin Chemical Company of Shaanxi Coal Group entered into a formal contract with Linde Engineering for the air separation unit required for the 1.8 million tons per year coal-based ethylene glycol production project; the contract covered the design, supply, and maintenance of 3 ultra-large-scale air separation units with a capacity of 100,000 Nm3/h each. The scope of the contract includes: the technical design and basic engineering design of the plant process package, the detailed engineering design of the cryogenic tank system, the supply of complete sets of process equipment, as well as technical services such as installation and commissioning. The \"Demonstration Project for the Production of New Chemical Materials through the Differential Utilization of Coal\" carried out by Yulin Chemical of Shaanxi Coal Group is currently the largest coal chemical project under construction in the world. The project covers an area of approximately 13 square kilometers, with an estimated total investment of 125 billion yuan. As a coal conversion demonstration project with the largest coal processing capacity, the highest degree of industrial integration, the most complex technology integration, and a supply chain that is closest to the end market, this project represents, to a certain extent, the highest level of development in the coal chemical industry. It will have a profound impact on the further development and direction of China’s coal chemical industry, as well as determine the extent to which China’s coal chemical supply chain will be expanded in the future. The project is constructed in two phases and four stages, comprising a total of 27 process units along with associated utility systems. These mainly include the medium- and low-temperature pyrolysis of 15 million tons of coal, the production of 5.6 million tons of methanol, 1.8 million tons of ethylene glycol, 2 million tons of MTO, as well as downstream products derived from these intermediate materials. The first phase of the project requires an investment of around 70 billion yuan; it will involve the construction of facilities for producing 1.8 million tons per year of ethylene glycol, 5.6 million tons per year of methanol, and 2 million tons per year of olefins, as well as a large volume of fine chemical products derived from these olefins. The investment for the first phase of this project is around 70 billion yuan, which will be used to build facilities capable of producing 1.8 million tons per year of ethylene glycol and 2 million tons per year of olefins, while also manufacturing a large number of fine chemical products derived from olefins. The facility for producing 1.8 million tons per year of ethylene glycol is part of the first stage of this project, and it represents the largest coal-based ethylene glycol production facility under construction worldwide. The estimated investment for this facility is 26.5 billion yuan. The project utilizes Collin’s patented dry powder gasification technology and Japan’s patented technology for producing ethylene glycol from syngas. Shaanxi Coal Group Yulin Chemical Co., Ltd. and Nippon Kako Kagaku Co., Ltd. jointly invested in establishing Shaanxi Coal Group Yulin Chemical Yugao Chemical Co., Ltd. to build and operate facilities for the production of oxalate esters as well as for the hydrogenation of oxalate esters to produce ethylene glycol.