Method of separating ethylene oligomerization reactor effluent
a technology of oligomerization reactor and ethylene oligomer, which is applied in the direction of separation processes, sustainable manufacturing/processing, bulk chemical production, etc., can solve the problems of increasing operating costs, increasing energy consumption and associated costs, and imposing limitations on improving energy efficiency, so as to reduce the load of the condenser and improve energy efficiency , the effect of reducing the use of energy
Active Publication Date: 2018-09-06
LG CHEM LTD
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Benefits of technology
The present invention provides a method for separating the reaction product from ethylene oligomerization. This method reduces the energy usage by cooling the reaction product to a lower temperature. The heat generated during cooling can be reused in the process, improving energy efficiency.
Problems solved by technology
Here, the bottom liquid discharged from the bottom of the C4 separation tower 2 is supplied as a feed for the C6 separation tower 4, and the temperature of the feed stream is higher than the temperature of the tray positioned at the bottom of the C6 separation tower 4, and thus a load is applied to a condenser 6 connected to the C6 separation tower 4, ultimately increasing energy consumption and associated costs.
Hence, to remove heat in order to solve such problems, a utility such as cooling water is excessively used, thus increasing operating costs.
In this case, however, the composition distribution in the tower is affected, and thus limitations are imposed on improving energy efficiency by controlling the feed stage of the tower to which the feed is supplied.
Method used
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example 1
[Example 1] Separation of Ethylene Oligomerization Effluent
[0026]With reference to FIG. 2 or A of FIG. 3, a Cr-based catalyst, an ethylene monomer and a solvent for dissolving them were added so that polymerization occurred. Of the reaction product, unreacted ethylene was separated from the C2 separation tower, and a C4 mixture was separated from the C4 separation tower 100, and the residual reaction product was transferred to the next stage. Here, the residual reaction product (including an ethylene polymer having 6 or more carbon atoms and solvent) had a pressure of 18.60 bar and a temperature of 235° C., and in order to lower the temperature thereof before being supplied to the C6 separation tower 140, heat exchange with the bottom stream of the C6 separation tower 140 was performed using a heat exchanger 120 in the reboiler. Subsequently, the residual reaction product cooled to 142° C. was sequentially transferred to the C6 separation tower 140, a solvent separation tower, a C8 ...
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Abstract
Disclosed is a method of separating an ethylene oligomerization effluent, in which, during the separation and purification of a product obtained through ethylene oligomerization, the temperature of the reaction product is adjusted and used, thus improving energy efficiency.
Description
TECHNICAL FIELD[0001]This application claims the benefit of Korean Patent Application No. 10-2015-0145231, filed Oct. 19, 2015, which is hereby incorporated by reference in its entirety into this application.[0002]The present invention relates to a method of separating an ethylene oligomerization effluent, and more particularly to a method of separating an ethylene oligomerization effluent, in which, during the separation and purification of a product obtained through ethylene oligomerization, the temperature of the reaction product is adjusted and used to thus improve energy efficiency.BACKGROUND ART[0003]A reaction product, obtained through ethylene polymerization, is composed of unreacted ethylene, a solvent necessary to dissolve a catalyst and ethylene upon polymerization, and linear α-olefins having various numbers of carbon atoms polymerized through the reaction, and such an effluent stream (reaction product) is separated into a target product via multiple recovery towers. FIG...
Claims
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IPC IPC(8): C08F6/00B01D3/14C07C2/08C07C11/02
CPCC08F6/001B01D3/143C07C2/08C08F10/02C08F2500/02B01D2257/702B01D2256/24C07C11/02C07C7/04Y02P20/52Y02P20/10C07C11/107C07C11/08C07C7/00
Inventor KIM, EUN-KYOLEE, JONG-KULEE, JEONG-SEOKKIM, MI-KYUNG
Owner LG CHEM LTD