High activity ethylene polymerization catalysts have been prepared by the reaction of magnesium chloride with titanium tetrachloride in tetrahydrofuran. followed by precipitation with excess n-hexane. The physical properties of catalyst such as surface area and titanium content were measured by BET method and redox titration, respectively. These catalysts were tested with ethylene polymerization reaction in the presence of AlEt₃ in the slurry reactor. The activities of prepared catalysts were more than 100kg PE/g·Ti·hr. Kinetic study of ethylene polymerization was performed by varying catalyst concentrations, monomer concentrations, the Al/Ti ratios, polymerization temperatures and hydrogen pressures. The overall polymerization rate was found to be first order with respect to the monomer concentration and the number of active sites. The decay rate of active sites was found to be first order with respect to time. The activation energies of propagation and the decay reaction of active sites were found to be 5.73 and 4.00 kcal/mol, respectively.

THF 용매하에서 MgCl₂와 TiCl₄를 반응시켜 착물을 형성하고 n-헥산을 가하여 침전시키는 방법으로 고활성 에틸렌 중합촉매를 합성하였다. AlEt₃를 공촉매로 사용하여 slurry 반응으로 에틸렌을 중합하여 촉매의 활성을 측정하였다. 촉매의 활성은 100kg PE/g·Ti·hr 이상으로 고활성을 나타내었다. 촉매의 표면적과 티탄 함량을 BET와 적정법으로 각각 측정하였다. 중합조건 변화에 따른 촉매특성을 조사하기 위하여 촉매의 농도, 단량체의 농도, Al/Ti의 비, 중합온도 및 수소압력 변화에 따른 중합속도의 변화를 구하였다. 중합속도는 단량체 농도와 활성점 농도의 1차에 비례하였다. 시간에 따른 활성점 감소도 1차로 나타났다. 성장반응의 활성화 에너지는 E_p=5.73kca1/mo1 이었고 활성점 붕괴반응의 활성화에너지는 E_d =4.00kcal/mol로 나타났다.