Homogeneous liquid–liquid extraction of metal ions with non-fluorinated bis(2-ethylhexyl)phosphate ionic liquids having a lower critical solution temperature in combination with water
Bis(2-ethylhexyl)phosphate ionic liquids show a temperature-dependent phase behaviour of the LCST-type and can extract transition metal ions very efficiently via homogeneous liquid–liquid extraction.
Method for the Synthesis of a Rare-Earth Organophosphate and Use Thereof for Preparing a Preformed Catalytic System
申请人:Thuilliez Julien
公开号:US20110009657A1
公开(公告)日:2011-01-13
A process for preparing a rare-earth organophosphate in the form of a gel that can be used as is for the preparation of a “preformed” catalyst system intended, in particular, for the cis-1,4 stereospecific polymerization of conjugated dienes.
Process for obtaining a butadiene homopolymer in the presence of monoolefin(s) with 4 carbon atoms
申请人:Barbotin Fanny
公开号:US20050283036A1
公开(公告)日:2005-12-22
A process is described for obtaining a 1,3-butadiene homopolymer by the reaction of a catalytic system in the presence of 1,3-butadiene and one or more monoolefin(s) with 4 carbon atoms. This catalytic system is based on at least: a conjugated diene monomer, an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent,
an alkylating agent of the formula AlR
3
or HAlR
2
, where R is an alkyl group, and an alkylaluminum halide halogen donor.
METHOD FOR SYNTHESISING A RARE EARTH ORGANOPHOSPHATE AND USE THEREOF TO PREPARE A "PREFORMED" CATALYTIC SYSTEM
申请人:Thuilliez Julien
公开号:US20120130055A1
公开(公告)日:2012-05-24
The invention relates to a process for preparing a rare-earth organophosphate in the form of a fluid or not very viscous solution that can be used as is for the preparation of a “preformed” catalyst system intended, in particular, for the cis-1,4 stereospecific polymerization of conjugated dienes.
neighbouring coordination octahedra linked by alkylphosphate bridges. LnA3 is very poorly soluble in alkanes as well as in donor solvents. However, we developed the series systems in which the solubility of LnA3 increases dramatically as a result of the formation of oligomers or mixed-ligand complexes. Coordination chemical processes occurring in these systems have been studied using thermodynamic and spectroscopic
摘要 镧系元素二(2-乙基己基)磷酸酯 (LnA3) 结晶为针状样品,呈现轴向织构,沿织构的同一周期为 5.3A。EuA3 的六边形单元格具有以下参数:α = 18.6 A , c = 10.4 A , z = 2。 从红外和发光 (EuA3) 光谱可以看出,LnA3 分子与相邻配位八面体形成刚性链配位聚合物结构由烷基磷酸桥连接。LnA3 在烷烃和供体溶剂中的溶解性非常差。然而,我们开发了一系列系统,其中由于形成低聚物或混合配体复合物,LnA3 的溶解度急剧增加。已经使用热力学和光谱方法研究了这些系统中发生的配位化学过程。讨论了所形成配合物的结构式和强度。在混合配体配合物分解时,Am-镧系元素和Eu-镧系元素系列发生了相当大的分离。