Method for preparation of polytrimethylene ether glycol and polytrimethylene ether glycol using the same

A method for preparing polytrimethylene ether glycol comprising steps of:

• conducting condensation polymerization of diol monomers in the presence of an acid catalyst to prepare a polymerization product (step 1);
• hydrolyzing the polymerization product using an organic solvent and water to prepare a hydrolyzed mixture (step 2);
• neutralizing the hydrolyzed mixture using basic salt (step 3);
• separating an aqueous phase and an organic phase after neutralization (step 4);
• and
• filtering salts existing in the organic phase (step 5).