Method for oligomerization of ethylene
AssigneeKorea Research Institute of Chemical Technology
InventorsDong Won Hwang, Ho Jeong Chae, MaEum Lee, Ji Sun Yoon
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Abstract
Methods for the oligomerization of ethylene, and more specifically, methods for the preparation of mainly ethylene oligomers of C10 or higher are described. A method can include performing a first oligomerization of an ethylene gas using a Ni-containing mesoporous catalyst, followed by a second oligomerization using an ion exchange resin, etc. to produce ethylene oligomers of C10 or higher. The method for the preparation of ethylene oligomers can produce C8-16 ethylene oligomers in high yield without inducing deactivation of the catalyst, compared to the conventional technology of ethylene oligomerization by a one-step process.
Claims11
A method for oligomerization of ethylene, comprising:
- a first step of oligomerizing ethylene in a gas containing ethylene at a temperature between 150° C. and 250° C. and a pressure between 0.1 MPa and 3 MPa in the presence of a first catalyst to produce a gas containing an ethylene oligomer, wherein the first catalyst is a Ni-containing mesoporous catalyst comprising a mesoporous carrier containing silica and alumina in a Si/AI molar ratio between 0.3 and 50;
- a second step of separating the gas containing the ethylene oligomer into a gas containing unconverted ethylene and a liquid containing an ethylene oligomer of C4 or higher by cooling the gas containing the ethylene oligomer;
- a third step of oligomerizing the ethylene oligomer of C4 or higher in the liquid containing the ethylene oligomer of C4 or higher at a temperature of 50° C. to 140° C. in the presence of a second catalyst to produce a liquid containing a C6-16 ethylene oligomer, wherein the liquid containing the C6-16 ethylene oligomer contains at least one ethylene oligomer of lower than C8 and at least one C8-16 ethylene oligomer, wherein the second catalyst is an Amberlyst-35 ion exchange resin catalyst or a Lewis solid acid catalyst;
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- a fourth step of separating the liquid containing the C6-16 ethylene oligomer into a gas containing the at least one ethylene oligomer of lower than C8 and a liquid containing at least one C8-16 ethylene oligomer by distillation at a temperature between 90° C. and below 121° C.
Dependencies are inferred from the claim text.