OPTIMIATION OF HEAVY OIL UPGRADING PROCESS WITH NON-CATALYTIC REFINING TECHNOLOGY

摘要

A non-catalytic refining process is effective in processing a wide variety of feedstocks, including those containing high-metal heavy resids. It can be used to improve the catalytic conversion process to meet the modern requirements for heavy oil upgrading. By renovating and taking full advantage of non-catalytic refining technology and properly combining with catalytic conversion process, it is feasible to increase light and more valuable products from heavy oil with minimal operating and investment costs. Several technological schemes have been developed and put into practice in a refinery in China by RIPP. Resids with carbon residue below 7% and metal content less than 20 ppm can be fed to a FCC in combination with a coker or a deasphaltor to process the treated oil. Needle coke can be obtained therefrom and the asphalt makes good paving material. By FCC-Coking or Deasphalting synergy, more light oils can be produced than FCC alone. Resids with higher carbon residue and metal content are generally first subject to deasphalting or coking, and the DAO or the CGO therefrom is used as FCC feed. Resids with metal content scattering among resins and asphaltenes are best processed with a combination of visbreaking and deasphalting. The poor quality asphalt is utilized by way of a newly developed technology for preparing asphalt water slurry fuel for boiler use. The coker gas oil, generally with higher nitrogen content and C/H ratio, is treated by solvent refining, which by removing the major part of the nitrogen from the oil and significantly decreasing the C/H ratio, greatly improves the gas oil quality for use as FCC feed. The extract from this process is returned to the coker to increase the yield of light oil. To increase the steam cracking feedstock for ethylene production, a process combining coking and hydrotreating provides economical feedstocks of better quality than straight-run products.