Technology and Catalyst for Catalytic Deolefin in Aromatic Combined Unit

Paraxylene (PX) is an important basic organic raw material. which mainly comes from the aromatic combined plant using reforming oil as raw material. The trace olefin residue in the reformer oil will seriously affect the subsequent PX production process and product quality. The technique uses a molecular sieve with a specific structure as the catalytic active center under the condition of non-hydrogen and converts the hard-to-separate trace olefin into easily separated high-boiling compounds and then removes it from the C-8 aromatic compounds. Shanghai Institute continued to study this technology, and successively developed DOT-100, D0T-200, and DOT-300 catalysts for reforming units of aromatic compounds and lD0-01 catalysts for isomerization units which solved the environmental problems caused by the discharge of a large amount of hazardous white soil waste inPX production units, and promoted the development of PXgreen production technology.

The technology has accumulated 12 authorized invention patents at home and abroad, and 1 second prize of provincial and ministerial technical invention. The Sinopec aromatic technology integrated with the catalyst has won the National Science and Technology Progress Special Award.

The technology of catalytic olefin removal of nonhydroformated oil developed by Shanghai Institute uses a liquid-solid fixed bed reactor to remove trace olefin on molecular sieve catalyst, which is an effective technical scheme for improving the quality and efficiency of the aromatics unit. Its technical characteristics are as follows:

◆ Strong applicability: direct replacement of white soil, simple process.

◆ High olefin removal rate: deep removal of trace olefin, long cycle life, effective protection of downstream adsorbents and catalysts.

◆ Low comprehensive cost: compared with the traditional clay process and hydrogenation process, the cost of olefins removal of tons of aromatic raw materials is reduced by more than 50%.

◆ Environmental friendly: Compared with the traditional clay process, it has the advantages of stable operation, fewer side reactions, no hydrogen, renewable, and the catalyst used is friendly.

At present, the main brands of catalytic decolefin catalysts include DOT-300 and lD0-01 decolefin catalysts, which have the characteristics of high activity, good stability, long service cycle, and renewable.

In 2009, DOT-100 reforming oil deolefin technology developed by the Shanghai Institute was first industrialized in the Tianjin Branch plant.

In 2015, D0T-200 reforming oil catalytic deolefintechnology was applied in Sinopec Zhenhai Refining and chemical Branch, Gaogiao Branch, and other devices, so far, technology has been applied in 6 domestic enterprises in 11 batches.

In 2019, the lD0-01 diolefin catalyst was successfully applied for the first time in the isomerization unit of the million-ton PX plant in the Hainan Refining and Chemical Company.

In 2020, D0T-300 reforming oil deolefin technology will be applied in the reforming unit of the Maoming Branch.

In 2022, the D0T-300 deolefin catalyst was successfully applied in the Yunnan Petrochemical reforming plant.

In 2023, the D0T-300 diolefin catalyst was successfully applied in Sinochem Quanzhou, Sichuan Petrochemical, Shanghai Petrochemical, and PetroChina Karamay Petrochemical-forming units.

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