Petroleo Brasileiro S.a. - Petrobras

Polialden Petroquimica S.a.

Jaime Correia Da Silva

Cecilia Maria De Figueiredo

Juan Raul Abarca

Gloria M Soares

Roberto Barcala Haag

Odyr Do Coutto Filho

Noemi Tatizawa

Richard Faraco Amorim

Danielle De Carvalho Pinto Freitas

Leandro Dos Santos Silveira

Elisabeth M Moreira

Hosam A Abdallah-Rehim

Fabio G Martins Costa

Katia Simone Zanco Palma

Cecilia Maria Ooelho De Figueiredo

Alberto C Carneiro Da Silva

The present invention relates to a process for obtaining a catalyst of high activity based on a mixture of supports, more specifically, the mixture of supports being AlOplus MgCl, intended for the production of polyolefins. The catalyst of the present invention involves the use of a spherical support based on special alumina that serves as a porous matrix, which is impregnated, by precipitation, with magnesium chloride by dissolving the latter in ethers and/or alcohols.

Catalyst and process for obtaining catalyst of high activity

Spherical catalyst, process for preparing a spherical polyethylene of ultra-high molecular weight

A proces for preparing a spherical support for the polymerization of alpha-olefins from an ammonium dawsonite which is spray-dryed and formed into spherical particles which are then calcined and impregnated with titanium to produce a spherical catalyst of good mechanical strength is described. Also described is the polymerization process which, in the presence of the spherical catalyst, yields polyolefin particles which preserve the spherical characteristics of the support, with low flow angle and good bulk density, as well as the product polyethylene obtained from the process.

Process for preparing a Ziegler-type spherical catalyst for alpha-olefin

Spherical ultra high molecular weight polyethylene

Description of the preparation of a Ziegler type catalyst system through impregnation of a special alumina with 0.8-1.0% by weight of titanium derived from a dilute solution of titanium halide in n-hexane, the activator employed being triisobutylaluminum or triethylaluminum at an (Al)/(Ti) molar ratio of 2.5/1 to 80/1 in the catalyst. The catalyst system has high efficiency and yield, and leads to polyethylenes of excellent physical and mechanical properties which make it particularly suitable for use in engineering plastics.

Process for preparing a Ziegler type catalytic system and process for

The object of the invention comprises a process for the preparation of fertilizers by solubilizing phosphate rocks containing impurities, which make processing thereof difficult. The process is a simple and direct one. The product thus prepared is easily handled, can be directly used as a powdered fertilizer and dispenses with any post-treatment steps, such as purification, filtration, etc. The rock is solubilized with acid ammonium sulfate or a mixture thereof with sulfuric acid. This acid ammonium sulfate can be formed 'in situ', by the reaction of ammonium sulfate and sulfuric acid. Reaction may take place in a mixing reactor, on a belt conveyor or in a granulator.

Process for the preparation of fertilizers by the partial solubilization

Growing community of inventors

Rio de Janeiro, Brazil

Jaime Correia Da Silva