METHOD FOR MAKING HIGH PURITY DICYCLOPENTADIENE

摘要

A method for making high purity dicyclopentadiene comprises the following steps: providing a dimer feedstock comprising dicyclopentadiene and methyl dicyclopentadiene; blending the dimer feedstock and a diluent to obtain a first blend; cracking the first blend in a vapor phase at 300° C. to 400° C. to obtain a cracked feedstock; separating the cracked feedstock into a second blend and a third blend; dimerizing the second blend at 50° C. to 120° C. to obtain a fourth blend; and separating the fourth blend to obtain a recycled diluent and high purity dicyclopentadiene. By using saturated C5 hydrocarbon, saturated C6 hydrocarbon, benzene and the mixture thereof as the diluent and the steps mentioned above, the clogging problem of cracker tubes is solved and the cost of makeup diluent usage is lowered.

主权项

1. A method for making high purity dicyclopentadiene comprising steps of:
providing a dimer feedstock comprising dicyclopentadiene and methyl dicyclopentadiene; blending the dimer feedstock and a diluent selected from a group consisting of: a saturated C5 hydrocarbon, a saturated C6 hydrocarbon, benzene and a mixture thereof, to obtain a first blend; cracking the first blend in a vapor phase at a cracking temperature ranging from 300° C. to 400° C. to obtain a cracked feedstock comprising cyclopentadiene, methyl cyclopentadiene and the diluent; separating the cracked feedstock into a second blend and a third blend, the second blend comprising cyclopentadiene and the diluent, and the third blend comprising methyl cyclopentadiene and the diluent; heating the second blend to a dimerizing temperature ranging from 50° C. to 120° C. to obtain a fourth blend comprising dicyclopentadiene and the diluent; and separating the fourth blend into a recycled diluent and a high purity dicyclopentadiene having a concentration of dicyclopentadiene greater than 95 weight percent based on the weight of the high purity dicyclopentadiene; wherein the diluent comprises the recycled diluent.