Braskem S.a.

Universidade Federal Do Rio De Janeiro

Petroleo Brasileiro S.a. - Petrobras

Universidade Federal Do Rio De Janeiro - Ufrj

Cristina Cardoso Pereira

Cristiano Piacsek Borges

Marcelo Farah

Marcos Roberto Paulino Bueno

Mariele Kaipers Stocker

Bárbara Iria Silva Mano

Vinicius Galhard Grassi

Maria Elizabeth Ferreira Garcia

Alberto Cláudio Habert

Rogério Massanori Sakahara

Jane Hitomi Fujiyama-Novak

Rafael Aislan Amaral

Jailton Ferreira Do Nascimento

Wilson Mantovani Grava

Rogerio Massanori Sakahara

Barbara Iria Silva Mano

Alberto Claudio Habert

The present invention deals with a method for obtaining membranes in the form of hollow fibers with application in the field of carbon dioxide removal from natural gas. The aforementioned membranes are obtained by means of heat treatment of polymeric membranes. In this method, polymeric membranes are obtained by a phase-inversion technique by immersion-precipitation and are subsequently subjected to a heat treatment, that is, that the membranes effectively become precursor membranes of the heat treatment. The heat treatment process involves the optimization of the heating rate, temperature, and stabilization time variables, aiming at the improvement of the transport properties of the polymeric membranes. After the heat treatment, it becomes possible to use the membranes in separation processes of gases which operate at pressures greater than 30 bar, with selectivity for carbon dioxide (CO).

Membranes in the form of hollow fibers for the separation of COfrom natural gas and method of preparation by heat treatment and development of a polymeric membrane precursor

Polymer compositions may include a polymer matrix containing a polyolefin, one or more polymer particles dispersed in the polymer matrix, wherein the one or more polymer particles include a polar polymer selectively crosslinked with a crosslinking agent, and wherein the one or more polymer particles has an average particle size of up to 200 &#x3bc;m. Processes of preparing a polymer composition may include mixing a polyolefin, a polar polymer, and a crosslinking agent; and selectively crosslinking the polar polymer with the crosslinking agent in the presence of the polyolefin. Methods may include increasing stress cracking resistance of a polyolefin by mixing a polar polymer with the polyolefin; and selectively crosslinking the polar polymer in the presence of the polyolefin with a crosslinking agent to form crosslinked polar polymer particles dispersed in the polyolefin.

Polyolefin compositions with improved mechanical and barrier properties

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Rio de Janeiro, Brazil

Cristina Cardoso Pereira