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1, Overview

The catalytic reforming oil is rich in aromatic hydrocarbons and contains a small amount of olefins. As the severity of the reforming becomes higher and higher, the olefin content in the reformed oil also shows a significant upward trend. The olefins must be removed from the qualified aromatics produced from the reformed oil, otherwise the Bromine Index, corrosiveness and pickling color of the aromatic products will be unqualified. The small amount of olefins in the reformed oil will also affect the performance of aromatics extraction and downstream equipment, adsorbents and catalysts to varying degrees. Therefore, how to reduce the olefin content in the reformed oil is a problem that needs to be solved urgently in the industry. The olefins in the reformed oil can be removed by the methods of granular clay adsorption, selective hydrogenation and molecular sieve catalytic refining. Due to the fast deactivation of white clay and short service life, frequent replacement is required, which not only increases the loss of aromatics, but also increases the workload of the operator. In addition, the white clay cannot be regenerated after inactivation, so a large amount of waste white clay needs to be landfilled, which is not conducive to environmental protection and requires additional landfill costs. The use of hydrogenation to remove olefins not only has the problems of large one-time investment, high energy consumption, and large loss of aromatics. At the same time, when it is used to remove olefins from the full fraction of reforming oil, the catalyst deactivates faster and the number of regenerations is less. It also limits the development of this technology. Therefore, the Research Institute of Petrochemical Technology has developed a TOR-1 catalyst containing a special molecular sieve, which uses a catalytic refining method to remove olefins in the reformed oil.

2. Performance Index

TOR-1 deolefin catalyst uses a special molecular sieve with unique pore structure and acid strength distribution as the active component, and is modified with appropriate additives. The single-pass life of the catalyst is more than 8 times that of industrial clay, and it can be regenerated more than 3 times. The overall performance ranks at the advanced level at home and abroad. Compared with white clay, TOR-1 has a longer service life, greatly reduces labor intensity, and reduces waste emissions by more than 90%.

Without changing the existing equipment, the TOR-1 catalyst can be used alone or in series with the clay. The operating conditions are basically the same as those of the clay, the operation is simple, and the operation is stable.

The physical index and technical index of TOR-1 deolefin catalyst are shown in Table 1 and Table 2, respectively.

Table 1, Physical Chemistry Index

Table 2, Operating conditions and performance guarantee