The Catalyst for 1-Butene Hydroisomerization To 2-Butene

With the large-scale large-scale development of catalytic cracking, steam cracking, and coal chemical MTOunits, the by-product carbon 4 resources are abundant. Quaternary carbon contains important organic chemical monomers, such as 1-butene, 2-butene, and isobutene. At present, the utilization rate of the domestic carbon quaternary chemical industry is much lower than that of developed countries. Due to the presence of trace 1,3-butadiene in the C-4 fraction, its high cohesion is easy to lead to the rapid inactivation of catalysts in downstream units such as 1-butene polymerization, polymerization to alkylated oil, catalytic cracking of C-4 to propylene and olefin disproportionation, which affects the stable operation of the unit and further affects the chemical utilization of C-4 resources. Secondly, 1-butylene and isobutylene have very close boiling points and are difficult to separate. High purity isobutylene can be prepared by isomerizing 1 butene to butene-2, and 2-butene can be used as high quality raw material for downstream olefin disproportionation. Therefore, the development of double bond hydroisomerization technology, which not only hydrogenates trace butadiene but also isomerates 1-butadiene to 2-butadiene, is a bridge and a link connecting the upstream and downstream utilization of the C-4 chemical industry.

Since 2005, Shanghai Institute has been committed to the research and development of 4-fraction carbon 1-butene hydroisomerization to butene-2 technology, created a carbon 4-hydroisomerization SHl-01 catalyst and reaction process with independent intellectual property rights and adapt to high space speed, and developed 400,000 tons/year 1-butene isomerization to 2-butene process package which can effectively support the quality and efficiency of enterprises. lt is of great significance to improve the comprehensive utilization of carbon 4 resources.

The project has obtained a total of 8 Chinese authorized invention patents.

Hydroisomerization technology of C-4 fractions to remove trace butadiene in raw materials by liquid phase hydrogenation and achieve 1-butene conversion to 2-butene, and its technical characteristics are as follows:

◆ Wide range of raw materials, can be used in catalytic cracking, steam cracking and coal chemical MTO and other four fractions of carbon raw materials.

◆ The operating conditions are mild and flexible, and it has a good technical effect on different fractions of C4.

◆ Full liquid phase cyclic hydrogenation process, high butadiene removal depth, high olefin yield, and excellent 2-butene selectivity.

◆ The catalyst has good stability and has been verified by industrial side-line test.

Application Diagram of C-4 Fraction Hydroisomerization to butene-2

Carbon tetrahydro isomerization catalyst for 2-butene production-grade SHI-01, the main product features are as follows:

◆ High isomerism activity and high selectivity: Under mild reaction conditions, the butadiene content in hydrogenation products was less than 10ppm, the olefin yield was >98.5%, the selectivity of 2-butene was >95%, and the reaction balance index was >97.5%.

◆ Low cost: Ni is used as the catalyst active component, which greatly reduces the catalyst use cost; And strong resistance to impurities inhibit the loss of active components.

◆ Environmentally friendly: The catalyst has no harmful and corrosive components does not pollute the environment, and is easy to handle.

In 2022, SHI-01 catalyst will be used in the 28,000 ton/year 1-butene unit of Zhongan Coalification.

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