Yulin Haierxi carbon four deep processing project fully started, the two phases of a total investment of 2.7 billion sword refers to MTBE and polyisobutylene industry chain.

On May 15, 2026, Shaanxi Yulin Haierxi C4 olefin isomerization project officially started construction in Qingshui Industrial Park, Yulin Economic Development Zone. The project uses Yulin coal chemical by-product C4 as raw material and extends down to MTBE, refined oil and polyisobutylene (PIB) and other products. The total investment is about 2.174 billion yuan and covers an area of more than 350 mu. After full completion, the annual comprehensive output value is expected to exceed 3.8 billion yuan and the annual comprehensive tax contribution exceeds 90 million yuan.

1. two-phase echelon advance: large-scale products to support the bottom, fine products to pull profits.

The project adopts a two-phase construction strategy, the first phase focuses on bulk chemical production capacity, the second phase extends to high value-added materials, forming a clear value climb path.

Phase I works(Investment is about 1.163 billion yuan, covering an area of more than 200 mu): MTBE production capacity is 150000 tons/year, refined oil is 300000 tons/year, annual revenue is expected to be 3.099 billion yuan, annual value-added tax contribution is 63.1196 million yuan, and more than 200 jobs will be created.

Phase II Project(Investment is about 1.011 billion yuan, covering an area of 154.7 mu): 50000 tons/year of isobutylene and 30000 tons/year of PIB polymer materials will be built, with an estimated annual output value of 0.748 billion yuan and an annual tax contribution of 28.3909 million yuan, driving more than 100 jobs.

The two phases together form a two-wheel drive structure of "stable cash flow of basic production capacity and profit elasticity of fine chemical industry", effectively balancing short-term returns and long-term profit space.

2. industry chain closed-loop logic and market impact

cascade utilization chain of carbon four resources is clear:

c4 by-product & rarr; MTBE refined oil (Phase I) & rarr; MTBE cracking to produce isobutylene & rarr; PIB polymer material (Phase II)

• MTBE: High-octane gasoline blending agent, stable market demand, is the core variety of cash flow protection in the first phase;
• isobutylene: It is produced by MTBE cracking and is a key intermediate for the synthesis of high-end materials such as PIB and butyl rubber;
• PIB (polyisobutylene): Widely used in lubricant additives, sealing materials, pharmaceutical packaging and other high value-added fields, profit margins significantly better than bulk products, and domestic high-active PIB long-term dependence on imports.

Key implications for industry practitioners: after the first phase of 150000 tons of MTBE production capacity is put into operation, it will have a certain impact on the MTBE spot supply pattern in the northwest region. Traders should track the construction progress and trial production time node in advance. The second phase of the PIB project is more worthy of focus-if it is successfully put into production, it has a direct reference value for the domestic PIB import substitution logic, and it is recommended that supply chain practitioners continue to pay attention to the follow-up start-up dynamics.

At present, the project has been put on record in September 2025, and all the pre-procedures such as safety assessment, environmental assessment and woodland have been completed, and the construction preparation stage has officially entered, with a relatively smooth pace of progress.