Research On Comprehensive Utilization Of Pyrolysis Carbon9

Nowadays, along with the expansion of ethylene production in China, the efficient use of by-product of Pyrolysis C9(Carbon9) in ethylene production is an important subject to petroleum refining industry. Currently, C9Distillate Fraction is mainly used as fuel and in making petroleum resin, which causes serious waste because in C9Distillate Fraction, dicyclopentadiene and methyl cyclopentadiene, with high value-added dimer, can not be efficetnly recycled. In this paper, the author analyzes the highly different boiling points of the component in the C9and cyclopentadiene and methyl cyclopentadiene monomer, then he obtains highly pure cyclopentadienyl and methyl cyclopentadiene by use of the depolymerization of dicyclopentadiene and methyl cyclopentadiene dimer, which provides a new direction of the comprehensive utilization of C9.朗读Nowadays in China highly pure dicyclopentadiene and methyl ring dicyclopentadiene are mainly obtained from extraction of the Pyrolysis in C5. It’s difficult to attain highly pure dicyclopentadiene and methyl ring dicyclopentadiene dimer because the components of the boiling point of C5are fairly similar to those of the cyclopentadienyl and methyl ring cyclopentadienyl. At the same time, the price of Pyrolysis C9is lower than that of pyrolysis C5. If the highly pure dicyclopentadiene and methyl ring dicyclopentadiene dimer are separated from Pyrolysis C9, it will meet our country’s rising requirement of CPD, MCPD and their dimmers and bring huge economic value. In this paper, the calculation and designation of cyclopentadienyl and methyl ring dicyclopentadiene separation column are based on the small scale tests of the MCPD and CPD separated by Pyrolysis C9. On the basis of the small scale tests, by verifying the process of cylopentadienyl and methyl ring cyclopentadiene produced by depolymerization rectification, the author obtains optimum conditions, and ensures the process of industrialization and technological conditions. Eventually by adopting two separation columns, the author achieves high purifying products of dicyclopentadiene and methyl ring dicyclopentadiene dimer.Experiments proves that it is feasible to use byproduct C9fraction as the raw material to extract highly pure CPD and MCPD in the process of depolymerized distillation column-distillation column. It has promising prospects for industrial development and great economic benefits. CPD>99%of cyclopentadienyl which is obtained from the depolymerization distillation column top, converts into highly pure DCPD product after a simple dimerization. In the depolymerized distillation column, when oil bath temperature is up to245degrees, depolymerization rate will reach80.65%,total yield will reach66.61%, CPD yield will reach64.18%, and MCPD yield will reach75.71%.In order to effiently instruct industrial production,the author also investigates depolymerization rectification column of coke case in continuous operation, especially the reasonableness of distillation equipments such as reactors, separation columns designed on small scale test process, and the engineering problems which are essencial to realize industrialization. Recently a certain amount of dicyclopentadiene and methyl cyclopentadiene products have been produced, at the same time market development work is being carried on.