Due to the current use of cracked C5 as cracking fuel, dicyclopentadiene has not been fully utilized, and the domestic market has strong demand. Under the conditions of cracking fuel balance and replacement, dicyclopentadiene should be extracted first and vigorous development of dicyclopentadiene Fine chemical industry based on diene as raw material. The remaining C5 component can operate methylpentylbutyl ether (TAME). After the ether component is hydrogenated, it will be returned to the cracking unit as raw material. This will optimize the raw material of the ethylene cracking unit and its benefits. Improvement plays a positive role.
Dicyclopentadiene : colorless crystals with a camphor-like odor. The relative density is 0.979 (20/20 ° C). Boiling point: 170 ° C (decomposed). The freezing point is 31.5 ° C. Refractive index nD (35 ° C) 1.5061. Flash point is 32.22 ° C. Auto-ignition point: 680 ℃. Soluble in alcohol. This product has two kinds of isomers of α and β, the freezing point of α isomer is 33 ℃, and the freezing point of β isomer is 19.5 ℃. Dicyclopentadiene mainly contains the alpha isomer and has a boiling point of 170 ° C. Because this product contains double bonds, it is easy to carry out addition reaction and self-polymerization reaction. In recent years, domestic large-scale ethylene plants such as Yangtze, Shanghai, Yanshan, Qilu have been rebuilt and expanded. After the transformation, the ethylene scale is 700-800 kt / a, the by-product cracking C5 is about 100 kt / a, and dicyclopentadiene can be extracted ～ 20 kt / a, the comprehensive utilization of C5 can reach the economic scale. Based on the by-product of 100 kt / a C5 and the extraction of 18 kt / a 85% dicyclopentadiene , the construction investment is about 14 million yuan. The C5 price is 1 800 yuan / t, and the dicyclopentadiene is 2 800 yuan / t. , It can increase sales income by 19.8 million yuan each year, the internal financial rate of return after tax can reach 40%, and the dynamic investment recovery period is only 4.3 years, which has good economic benefits.
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