Tianjin Petrochemical's small diene makes up for its disadvantages. Diene yield tops the list

        China Petrochemical News (Zhang Hui, Li Jianzhong, Diene) The snail shell still serves as a dojo. Tianjin Petrochemical adjusted its production process and optimized production operations in response to changes in the quality of raw materials. In January, the yield of small ethylene diene rose to 51.41%, which is a new record after reaching 50.49% in December last year and ranking first among the group companies. new highs.

        Diene yield refers to the yield of ethylene and propylene products in the production of ethylene plant, and is an important economic and technical indicator of ethylene plant. Tianjin Petrochemical’s 200,000 tons of small ethylene is used as a refined product to make up for the disadvantages of small scale. Under the situation of complex and changeable cracking raw materials, it starts from optimizing the raw material structure, process production and production operations, and strengthening equipment management. At a high level, the yield of diene has been increasing month by month. In January, the feed volume of the ethylene plant was 47,799 tons, an increase of 1,305 tons of diene and 5.85 million yuan in efficiency compared with last year's monthly average.

        Raw materials are an important factor that affects the economic and technical indicators of ethylene production. For this reason, the Olefin Department has established an ethylene raw material optimization team to regularly study ethylene raw material optimization plans. They carefully analyzed the influence of different raw material structures on the yield and benefits of diene, and determined the best mixing ratio of multiple raw materials.

        The supply gap of diene raw materials is the “congenital deficiency” of Tianjin Petrochemical Corporation. Especially in January this year, the supply gap of high-quality raw materials such as alkane-rich gas, ethylene-rich gas, and disproportionation tail gas has increased. The Olefin Department analyzed the status of existing raw materials and found that the n-alkane content of light naphtha increased by 1.02% from the previous month. They seized this favorable factor to increase the production of ethylene and propylene, promptly put into use nearly 900 tons of light naphtha, and successfully increased the yield of diene.

        At the same time, the quality of other raw materials in January was also changing. The monthly average aromatic index value of diesel dropped by 1.3 compared with the previous month, which is also conducive to the improvement of diene yield. The olefin department decisively optimized the production process. By adjusting the cracking depth, increasing the outlet temperature of the cracking furnace, and optimizing the water-to-oil ratio and feed load and other process parameters, the product structure was changed, so that the volume of ethylene and propylene in the composition of the cracked gas at the outlet of the diesel cracking furnace The score increased by 2.90% and 0.83% all at once.

        In order to further increase the yield of diene, the olefin department has also made great efforts to optimize production operations. According to the ethylene and propylene content in the bottom of the ethylene rectification tower and the propylene rectification tower, they adjusted the heating and reflux extraction operations of the two rectification towers, which effectively suppressed the loss of the two towers and reduced the loss of diene. According to the composition changes at the inlet and outlet of the C2 and C3 hydrogenation reactors, the hydrogen distribution amount is adjusted in time, which reduces the loss of diene.

        In addition, the Olefin Department also strictly controls the quality of incoming raw materials. The externally collected raw materials are sampled in each vehicle, and the mutual supply of raw materials is regularly analyzed to ensure that the quality of raw materials is qualified. The equipment operation of the raw material receipt and payment process is strictly controlled, and the materials are paid smoothly; The compressor system does not condense gas, avoids system fluctuations, and enables the refrigeration system to fully meet the needs of the separation users, which promotes the stable increase of the diene yield of the ethylene plant.

Information source: Diene Sinopec News Network