As an important part of biomass energy, second-generation biodiesel is regarded as an important renewable fuel to make up for the shortage of fossil energy in my country and help reduce CO2 emissions. The current commercial production process uses biological oil as raw material and uses a supported transition metal sulfided catalyst for catalytic hydrodeoxidation in a fixed bed reactor. Due to the large amount of water produced during the reaction process, the surface active species of sulphide and the catalyst carrier structure will be destroyed under high temperature and high pressure, resulting in deactivation of the catalyst, making it difficult for existing industrial devices to operate for a long time. The suspended bed-fixed bed coupled hydrogenation process proposed by this technology can well solve the above problems.

     1. The conversion rate of oil and fat raw materials is ≥98%, the deoxidation rate is ≥98%, and the yield of diesel components is ≥75%. Compared with the existing technologies at home and abroad, it shows more excellent raw material adaptability (especially waste oils such as waste oils and acidified oils) and diesel yields, and the average catalyst life is increased by about 30%-40%.

     2. Efficient conversion of waste oil raw materials is achieved, and the density of the obtained product is~0.8 g/cm3, cetane index is close to 100, sulfur and nitrogen contents are less than 5 μg/L, and all indicators of the product meet the EU standards for second-generation biodiesel export.

 (This achievement was released by the Qingdao University Institute Technology Transfer Joint Office)