Abstract:
A method of depolymerizing plastic waste using a supported heteropolyacids catalyst is described herein. The method provides with high efficiency a high quality liquid depolymerization product usable as cracker feedstock.
Abstract:
A solid catalyst component for the polymerization of olefins comprising Mg, Ti and a an electron donor of formula (I) where the R 1 and R 5 groups, equal to or different from each other, are selected from C 1 -C 15 hydrocarbon groups, R 2 group is selected from C 2 -C 10 hydrocarbon groups, R 3 to R 4 groups, independently, are selected from hydrogen or C 1 -C 20 hydrocarbon groups, optionally fused together to form one or more cycles, with the proviso that at least one of R 3 to R 4 groups is a C 1 -C 20 alkyl group. The catalyst system based on the solid catalyst component is endowed with high activity and stereospecificity.
Abstract:
A process for the preparation of a solid catalyst component for the homo or copolymerization of olefins which comprises Mg, Ti, halogen and an electron donor selected from cycloalkyl ethers, said process comprising (a) dissolving a Mg based compound and a TiCI 3 based compound in a liquid medium further comprising a cycloalkyl ether and a compound of formula R 2 OH where R 2 is a C 1 -C 20 hydrocarbon group, in which the Ti/Mg molar ratio ranges from 0.1 to 0.5, the cycloalkyl ether/Mg ratio ranges from 1 to 4 and the R 2 OH/Mg molar ratio ranges from 1 to 4; and (b) adding, to the solution coming from step (a), SiCI4 in an amount such that the R 2 OH/SiCI4 molar ratio ranges from 0.5 to 1.5 and maintaining the temperature in the range 50-150°C thereby allowing precipitation of the solid catalyst component particles.
Abstract:
A solid catalyst component obtainable by a process comprising: (a) a first step in which a titanium compound of formula Ti(OEt) 4 , is reacted with a Mg based compound at a Ti/Mg molar ratio between 0.2 and 0.4, at a reaction temperature between 110 and 130°C during 2 to 5 hours; and (b) a subsequent step in which the product obtained in (a) is reacted with a Ti compound formula Ti(OR I ) 4-y Cl y , where y is a number between 3 and 4.
Abstract translation:(a)第一步,其中使式Ti(OEt)4的钛化合物与基于Mg Ti / Mg摩尔比为0.2-0.4的化合物,反应温度为110-130℃,时间为2-5小时; 和(b)随后的步骤,其中使(a)中获得的产物与Ti化合物式Ti(OR 1)4-yCl y sub>,其中y是3到4之间的数字。 p>
Abstract:
Halogenated alcohols used in gas phase polymerization of ethylene in combination with a Ti based catalyst component and aluminum alkyls as co-catalyst allows to efficiently suppress ethane formation and to simultaneously increase the polymerization activity.
Abstract:
A Mg compound based catalyst precursor comprising up 50% by mols, with respect to Mg, of a compound of formula K(OR 1 ) where R 1 is H or a C 1 -C 10 hydrocarbon group. When treated with transition metal compounds the said precursor are converted into catalyst with high activity in olefin polymerization.
Abstract:
A catalyst component for the (co)polymerization of olefins, comprising Ti, Mg, halogen, an electron donor (ID) selected from aliphatic cyclic ethers or alkyl esters of aliphatic monocarboxylic acids and a compound of a metal selected from Zn or Cu which is devoid of Zn-C or Cu-C bonds in which the Mg/Ti molar ratio ranges from 4.0 to 50.0 is capable to produce LLDPE with excellent quality due to capability of comonomer randomization.
Abstract:
Catalysts systems for the polymerization of olefins CH 2 =CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a halogenated cyclic ether compound show improved polymerization activity.
Abstract:
Catalyst components for the polymerization of olefins CH 2 =CHR wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising Mg, Ti, CI and a diol or a derivative thereof.
Abstract:
Solid adducts comprising a MgCl 2 , ethanol and a compound (A), said compounds being present in molar ratios defined by the following formula MgCl 2 (EtOH) n (A) p in which n is from 0.1 to 6, p ranges from 0.001 to 0.5 and A is a compound selected from cyclic hydrocarbon structures which are substituted with at least two hydroxy groups.