Distillation of Styrene

PURPOSE: A method for distilling a vinyl aromatic monomer is provided, which is suitable for destabilizing and purifying the styrene stabilized with 4-t-butylcatechol for transportation. CONSTITUTION: The method comprises the step of distilling a vinyl aromatic monomer in the presence of 4-t-butylcatechol and oxygen containing no aromatic nitro or amino compound. The vinyl aromatic monomer is preferably styrene. 4-t-Butylcatechol is fed into a distillation apparatus together with a vinyl aromatic monomer, and the concentration of 4-t-butylcatechol is 200-15,000 ppm at the bottom part of the distillation apparatus based on the concentration of the vinyl aromatic monomer. The vacuum distillation is carried out at a temperature of 40-125 deg.C. A gas containing oxygen is fed by a circulation pump equipped at the suction side upstream of a distillation assembly. The content of oxygen fed is 0.01-0.5 wt.% based on the weight of the vinyl aromatic monomer. 어떠한 방향족 니트로 또는 아미노 화합물도 임의의 유효량으로 존재하지 않는, 4-t-부틸카테콜(TBC) 및 산소의 존재하에 비닐방향족 단량체의 증류방법. 상기 방법은 특히 운송을 위해 4-t-부틸카테콜(TBC)로 안정화된 스티렌을 탈안정화 및 정제하기에 적합하다.