Recently, Yulin Chemical Shenhua Yulin Circular Economy Coal Comprehensive Utilization Project issued the second public bidding announcement for polyethylene elastomer technology license, basic design and technical services.

The total investment of this project is as high as 79.836 billion yuan, and it is located in Yulin, Shaanxi. Relying on its own supporting coal mines and coal preparation plant resources, it adopts a coal grading and quality utilization model to create a comprehensive industrial project integrating coal gasification, new materials, and new energy. The bidding content of this project is related to the supporting services of copolymer polyethylene elastomer, including alpha olefin preparation, patent authorization of ethylene tetramer technology, process package output, technical training, basic design, and full process technical supporting services. The project site is located in the northern area of Qingshui Industrial Park, Yushen Industrial Zone, Yulin City, Shaanxi Province.

Large scale and volume

This project covers multiple core areas such as coal liquefaction, coal gasification, naphtha methanol coupled cracking, methanol to olefins, polycarbonate, and coal based biodegradable materials. A total of 38 core process units are planned, along with supporting construction of storage and transportation, public works, and various auxiliary production facilities. The industrial layout is complete and comprehensive. The project has a rich and diverse product system, which can produce special fuels such as coal based jet fuel, coal based diesel, gasoline, and coal liquefaction asphalt. At the same time, it produces fine chemicals such as xylene, mixed aromatic hydrocarbons, polycarbonate, as well as multiple coal based biodegradable new materials. At present, the first phase of the project has been completed and officially put into operation. The overall project mainly consists of five main projects: coal gasification, coal liquefaction, oil alcohol co refining and downstream processing, methanol to olefin and downstream processing, and coal based biodegradable materials, as well as various supporting public and auxiliary facilities. Each sector has clear division of labor and coordinated linkage.

Among them, the coal gasification sector will maintain the original methanol production capacity of 2.1 million tons/year, expand and optimize the scale of coal gasification and air separation units in combination with the demand for hydrogen for coal liquefaction, and build a complete set of production units such as air separation, coal gasification, acid gas removal, hydrogen purification, and methanol synthesis. The coal liquefaction sector is a newly added construction content in this project, with a new 2.16 million tons/year coal direct liquefaction production line, supporting the construction of large-scale coal liquefaction, hydrogenation stabilization, hydrogenation upgrading and other core devices, greatly improving the coal deep processing capacity.

The downstream sector of methanol to olefins has been optimized and adjusted on the basis of its original production. The production capacity of methanol to olefins units has been halved, and the scale and product structure of downstream supporting facilities have been synchronously adjusted; Upgrade the category of polyethylene equipment, add special rubber and ultra-high molecular weight polyethylene products, and shut down the production line of alcohol ether derivatives. The oil alcohol co refining sector is a newly added construction content, focusing on the high value-added utilization of naphtha. A new 2 million tons/year naphtha methanol coupled cracking unit will be built to explore the economic value of by-products. The coal based biodegradable materials sector relies on the by-product hydrocarbon resources of the entire plant to build two sets of biodegradable material production facilities, namely polybutylene carbonate and polybutylene succinate, to improve the green new materials industry chain.

Project Background

The CTC large-scale comprehensive coal chemical project belongs to the National Energy Group and was officially approved by the National Development and Reform Commission in March 2015. One phase of the project is a pilot demonstration project with a total investment of 13.6 billion yuan. The park covers an area of about 14 hectares and is a key benchmark project in the coal chemical industry sector of the group during the 13th Five Year Plan period. The first phase of the project mainly provides raw material support for downstream methanol processing projects in the region, with a core construction of 1.8 million tons/year methanol and 400000 tons/year ethylene glycol co production units, supporting a complete set of public and auxiliary facilities such as air separation, coal gasification, environmental protection treatment, and power supply, and a complete production system.

Abundant production results

At the end of 2020, the first phase of the project successfully completed the entire production process and produced methanol products that meet the production standards for methanol to olefins. In November 2021, the 400000 tons/year ethylene glycol production line was successfully put into operation, producing qualified finished products. Keywords: Yulin coal chemical industry, coal liquefaction, petrochemical industry

Relying on the production of intermediate products from ethylene glycol, the project continues to extend the industrial chain and lay out high-end biodegradable new materials. In September 2022, the 50000 ton/year demonstration project for biodegradable materials of polyglycolic acid in the park was fully put into operation, marking the successful industrial production of the world's first 10000 ton coal based biodegradable material project and filling the technological gap in the industry.Editor/Gong Ziwei