Speeding up the pace of upgrading oil quality-record of the development of China Petroleum clean gasoline production technology

Recently, the “Ultra-Deep Hydrodesulfurization of Catalytic Cracking Gasoline-Olefin Segmented Control and Conversion Complete Technology” jointly completed by the Lanzhou Chemical Research Center of China Petroleum and Petrochemical Research Institute, China University of Petroleum (Beijing) and Fuzhou University won the 2020 National Second prize for scientific and technological progress
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This technology overcomes the major problem of China's production of clean gasoline with the national V/VI standard, and provides an internationally advanced clean oil production technology for China and the world's oil refining industry

"In order to control the emission of automobile exhaust pollutants, China has accelerated the pace of upgrading oil quality, reducing the sulfur content of motor gasoline from 50 mg/kg in the National IV standard to 10 mg/kg, which will never cause the olefin content formed by photochemical smog.
If it exceeds 28v%, it is reduced to no more than 24v% for National V, 18v% for National VI(A), and 15v% for National VI(B).
This makes the catalytic cracking (FCC) gasoline with high sulfur and olefin content for automotive use China’s refining industry, which is the main blending component of gasoline, is facing severe challenges
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Since FCC gasoline with high sulfur and high olefin content accounts for about 60% of China’s automotive gasoline pool, its cleanliness is the core task of China’s gasoline quality upgrade

Selective hydrodesulfurization technology is the dominant FCC gasoline cleaning technology in the world
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Although this technology can reduce the content of olefins by increasing the severity of hydrogenation to saturate olefins into alkanes, it will seriously result in the loss of gasoline octane number.

In response to this worldwide problem, based on the idea of ​​molecular refining, researchers have revealed the evolution of the structure and reactivity of olefins and sulfur-containing compounds in FCC gasoline with the reaction process, and solved the restriction of the reduction of olefin content and the maintenance of octane number.
The password to clean gasoline
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They creatively proposed the concept of stepwise regulation of olefin molecular conversion, and created a three-functional pre-hydrogenation catalyst and pre-hydrogenation technology of olefin double bond isomerization, thiophene alkylation, and mercaptan etherification, and realized the conversion of mercaptans and part of thiophenes.
Transfer of light gasoline to heavy gasoline; invented a highly selective hydrodesulfurization catalyst coupled with olefin single-branched isomerization function, realizing high-selective hydrodesulfurization of heavy gasoline; invented a non-noble metal olefin double-branched isomerization catalyst , So that it is not restricted by the micropores, and becomes a necessary condition for further generation of double-branched isoparaffins; invented an alumina/grade pore molecular sieve composite carrier with fully exposed pores and strong acidity, and developed non-precious metal olefin double With the branched chain isomerization catalyst, when the olefin content of heavy gasoline is reduced by 12.
08v%, the mass ratio of double/single branched isoparaffins is increased by 7 times, which solves the problem of reducing olefin content and maintaining octane number
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This technology solves the bottleneck problem of reducing the olefin content of FCC gasoline and maintaining its octane number, which restricts the cleanliness of FCC gasoline.
When producing ultra-clean gasoline blending components with a sulfur content of less than 10 mg/kg, it can greatly reduce olefins.
While maintaining the octane number of gasoline, it has become one of the mainstream technologies of China's FCC gasoline cleaning
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At present, this technology has been successively applied to the upgrading and transformation of FCC gasoline hydrodesulfurization units constructed using foreign technologies and similar domestic technologies
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The Golmud Refinery of Qinghai Oilfield used this complete set of technology to transform its FCC gasoline hydrodesulfurization unit built with imported technology, so that the unit realized from the production country IV standard clean gasoline blending component to the production country V/National VI standard clean gasoline blending group The upgrade of points

At the end of 2017, the China Petroleum Organization established a technical appraisal committee with Academician Hu Yongkang as the director, four academicians Shu Xingtian, Hong Maochun, Fu Xianzhi, Chen Fen'er, and well-known domestic experts to appraise the project
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The experts at the meeting agreed that the technological achievements have generally reached the international advanced level

Chang Xiaoxin, deputy director of the Lanzhou Chemical Research Center, said that the complete set of technology has been applied to 19 sets of National V/National VI clean gasoline production equipment, including 4 sets of upgrading and transformation using similar foreign and domestic technology equipment, with a total scale of 13.
7 million.
Tons/year; permission to build 3 sets of devices with a total scale of 3.
9 million tons/year
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In addition, the project has cumulatively reduced automobile exhaust sulfur dioxide emissions by about 1,600 tons, hydrocarbon emissions by about 120,000 tons, and nitrogen oxide emissions by about 60,000 tons, which is a comprehensive implementation of the air pollution prevention and control action plan and the construction of green mountains and green mountains.

The current situation that China's vehicle gasoline pool uses FCC gasoline as the main blending component makes the gasoline quality upgrade of China's refining enterprises face tremendous pressure
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The successful development and large-scale industrial application of this complete set of technology has broken through the technical bottleneck restricting China’s FCC gasoline cleaning, and has enabled China’s clean gasoline production technology to develop rapidly from the past to the current parallel or even lead.