Method for removing polymers inside olefin oligomerization reactor
AssigneeHanwha Totalenergies Petrochemical Co., Ltd.
InventorsWonjong HONG, Kyesung CHO, Young Hoon SOHN, Minsu KO, Jinsuk LEE, Sangjoon OH, Hosik CHANG
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Abstract
The present invention relates to a method for removing polymers which are generated during olefin oligomerization and which are accumulated inside a reactor and cause fouling, the method enabling simultaneous oligomerization and polymer removal so that process operation can be efficient, requiring no separate heat source or cooling water such that economic feasibility is improved, and rapidly cooling a polymer solution such that polymers are readily removed from a solvent, thereby enabling solvent recovery rate to be improved.
Claims18
A method for removing polymers in an oligomerization reactor, the method comprising:
- (a) preparing an ethylene-based oligomer from reactants including ethylene, a solvent, and a catalyst in a reactor;
- (b) removing polymers included in an oligomer product solution;
- (c) distilling the oligomer product solution from which the polymers have been removed in (b) to separate the solution into C4 or lower hydrocarbons, 1-hexene, 1-octene, C10 or higher hydrocarbons, and the solvent;
- (d) recovering a heated recovered solvent obtained by heating a part of the separated solvent of (c) to the reactor to dissolve residual polymers in the reactor to prepare a polymer dissolved solution;
- (e) mixing the polymer dissolved solution and the remaining recovered solvent of (c), and rapidly cooling the polymer dissolved solution to precipitate the polymers;
- and
- (f) separating the polymers from the solvent, in the polymer dissolved solution from which the polymers have been precipitated.
Dependencies are inferred from the claim text.