Practical selective monohydrolysis of bulky symmetric diesters: Comparing with sonochemistry
作者:Jianjun Shi、Tian Zhao、Satomi Niwayama
DOI:10.1016/j.tet.2018.09.051
日期:2018.11
The conditions of the practical selective monohydrolysis of symmetric diesters we previously reported have been modified and applied to selective monohydrolysis of bulky symmetric diesters. While ultrasound is generally considered effective for two-phase reactions, its effect actually turned out to be rather marginal. Instead, use of a larger proportion of a polar aprotic co-solvent, DMSO, and aqueous
PREPARATION METHOD OF SOLID CATALYST FOR PROPYLENE POLYMERIZATION, AND CATALYST PREPARED THEREBY
申请人:Samsung Total Petrochemicals Co. Ltd.
公开号:EP2524930A2
公开(公告)日:2012-11-21
Disclosed are a method for preparing a solid catalyst for propylene polymerization and a catalyst prepared thereby. Specifically, disclosed are a method for preparing a solid catalyst for propylene polymerization which can prepare polypropylene having excellent stereoregualrity with a high production yield by using silane compounds and bicycloalkanedicarboxylate or bicycloalkenedicarboxylate as an internal electron donor, and a catalyst prepared thereby method for preparing polypropylene using the same.
SOLID CATALYST FOR THE POLYMERIZATION OF PROPYLENE, AND METHOD FOR PREPARING SAME
申请人:Samsung Total Petrochemicals Co. Ltd.
公开号:EP2644628A2
公开(公告)日:2013-10-02
Provided are a solid catalyst for propylene polymerization and a method for preparing the same, specifically a solid catalyst for propylene polymerization which does not contain any environmentally harmful material and can produce a polypropylene having excellent stereoregularity with a high production yield, and a method for preparing the catalyst.
The present disclosure relates to a process for producing ethylene oligomers and more particularly, to a process for oligomerizing ethylene by recycling butene, hexene, and octene in an ethylene oligomerization reaction with a catalyst system including a transition metal or transition metal precursor, a ligand with a backbone structure expressed by the following Chemical Formula 1, and a co-catalyst. [Chemical Formula 1] R1—O—Y—O—R2 or R1—OC(═O)—Y—C(═O)OR2 Herein, R1, R2 are each independently hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl, or substituted heterohydrocarbyl, and Y represents a group connecting O or C(═O)O and is hydrocarbyl, substituted hydrocarbyl, hetero hydrocarbyl, or substituted heterohydrocarbyl. According to the oligomerization method of the present disclosure, in the distribution of the produced α-olefins, C10″-C12″ α-olefins care highly distributed, the produced α-olefins have a remarkably high purity.
SOLID CATALYST FOR PROPYLENE POLYMERIZATION AND A METHOD FOR PREPARATION OF POLYPROPYLENE USING THE SAME
申请人:KIM Sang Yull
公开号:US20120277389A1
公开(公告)日:2012-11-01
Provided are a solid catalyst for propylene polymerization which includes titanium, magnesium, halogen and an internal electron donor mixture of two or more compounds wherein the internal electron donor mixture includes at least one selected from the bicycloalkanes or bicycloalkenes and at least one selected from diethers and succinates, and a method for preparing propylene using the same. As disclosed, it is possible to prepare polypropylene having an excellent stereoregularity with a high production yield.