Breakthrough in raw materials for ethylene product

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It is understood that the 200000 ton/year reformer raffinate hydrogenation unit, which all adopts the non noble metal hydrogenation catalyst of PetroChina's independent technology, has been running smoothly in Dalian Petrochemical Company for one month. This not only marks that PetroChina has mastered the independent technology of non precious metal hydrogenation process in the field of reforming raffinate hydrogenation, but also means that the domestic available reforming raffinate of about 2million tons/year is expected to achieve economic hydrogenation

it is reported that at present, the processing capacity of domestic catalytic reforming units is nearly 9million tons/year, and the available reforming raffinate resources are about 2million tons/year. The reformate raffinate after aromatics extraction from the reformate will contain a certain amount of olefins generated by high-temperature dehydrogenation in the reforming process. However, to produce ethylene cracking material or qualified solvent oil, the olefins in the raffinate oil need to be removed. Hydrofining to remove olefins from raffinate oil includes two processes: hydrofining before extraction and extraction before hydrogenation. Most of the catalysts used are precious metal catalysts. The advantage of using noble metal catalyst is low operating temperature, but the disadvantage is that the cost is very high, and the requirements for impurities in raw oil are very strict. Hydrogenation of reforming raffinate is not economical

with the joint efforts of Sinopec and Dalian Petrochemical, non noble metal hydrogenation catalysts have been stably applied. At present, the 200000 t/a reforming raffinate hydrogenation unit of Dalian Petrochemical operates smoothly, with a feed rate of 23 T/h, an inlet temperature of 140 ℃, and a uniform bed temperature distribution. The olefin content of the product is far below the index requirements. As a result, Dalian Petrochemical can comprehensively utilize 450000 tons of reforming raffinate oil every year, with a direct economic benefit of nearly 100 million yuan

it is understood that the expensive platinum catalyst hydrogenation process is often used in China's petroleum system before, and there is no precedent for using non noble metal hydrogenation catalyst to produce ethylene raw material. In June this year, Dalian Petrochemical and Lanzhou center of the Petrochemical Institute held an exchange, hoping to jointly use idle devices to complete the replacement of precious metal catalysts in the shortest time and in the most economical way

to this end, Dalian Petrochemical and Lanzhou center of the Petrochemical Institute set up a project team, which completed a series of work within three months, including the determination of the process route, the screening and improvement of the standard production agent of the catalytic container bottom plate testing machine, the side line evaluation of the trial production of tepov products with an annual capacity of 85000 tons, and the production of catalysts. In order to ensure the safe industrial application, the technical personnel took the raw material of reforming raffinate from Dalian site for many times to Lanzhou center for side line evaluation and process condition test, and determined the process parameters and other conditions

At the start-up stage of catalyst loading, personnel from both sides communicated for many times and repeatedly confirmed that the loading instigation mechanism of the two-day high dynamic pendulum dynamometer was closed in the glass hood and the loading of the whole reactor was completed in quality. In the subsequent vulcanization and start-up process, the technical personnel of both sides stayed at the front line of the unit for 3 days and 3 nights, ensuring the smooth and orderly progress of the catalyst vulcanization process and start-up process

note: 2. Since the double column tensile machine is double column, compared with the single column tensile testing machine, the source of this reprint is indicated. The reprint is for the purpose of transmitting more information, and does not mean to agree with its views or confirm the authenticity of its content

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