Method of preparing conjugated diene-based polymer and apparatus for preparing conjugated diene-based polymer

An apparatus for preparing a conjugated diene-based polymer, comprising:

• an apparatus for preparing a first conjugated diene-based polymer comprising a first polymerization reactor for polymerizing a first conjugated diene-based polymer in solution and a first purification unit for purifying a first fluid separated from a first polymer solution prepared in the first polymerization reactor;
• and
• an apparatus for preparing a second conjugated diene-based polymer comprising a second polymerization reactor for polymerizing a second conjugated diene-based polymer in solution and a second purification unit for purifying a second fluid separated from a second polymer solution prepared in the second polymerization reactor, wherein
• the first purification unit comprises a first feed tank, a first column connected to the first feed tank, and a first′ column connected to the first column,
• the second purification unit comprises a second feed tank, a second column connected to the second feed tank, and a second′ column connected to the second column,
• an upper portion of the first column is connected to the second feed tank by a connecting pipe for supplying a fluid discharged from the upper portion of the first column to the second feed tank, and
• the second feed tank is connected to the first feed tank by a connecting pipe for supplying a third fluid to the first feed tank.