Petroleo Brasileiro S.a. - Petrobras

Other

Gustavo Torres Moure

Dennis N Stamires

Paul O'Connor

Edisson Morgado Junior

Oscar Rene Chamberlain Pravia

Marco Antonio Santos De Abreu

Yiu Lau Lam

Alexandre De Figueiredo Costa

Rodolfo Eugenio Roncolatto

Anselmo Da Silva Santos

Leonardo Fialho De Mello

Alvaro Saavedra

Edisson Junior Morgado

Marco Antônio Santos De Abreu

An integrated process for the manufacture of olefins and intermediates for the production of ammonia and urea, comprising an FCC reactor, a regenerator, a steam reforming unit, an air-separation unit, an ammonia production unit and a urea production unit, is described. This process makes it possible to minimize COemissions to atmosphere, make use of heavy feedstocks of low added value (AR) for the production of light olefins, in addition to making maximum use of all the flows involved, thus increasing the energy efficiency achieved, all at the same time.

Integrated process for the manufacture of olefins and intermediates for the productions of ammonia and urea

The invention relates to a process carried out continuously in one or more reactors connected in series for the preparation of sodium titanate nanotubes and their derivatives obtained by ion exchange and/or thermal treatment, by reacting titanium oxides with sodium hydroxide under suitable hydrothermal conditions to obtain or control the morphology of nanostructural titanates. The reaction mixture is introduced continuously into the reactor at a feed rate that is the same as the rate of discharge of the product. When more than one reactor is used, the material leaving the first reactor is used to feed the next reactor, and a differential of temperature is applied between the reactors in such a way as to obtain in the average, a temperature of between 60&#xb0; C. and 180&#xb0; C.

Continuous process for the preparation of sodium titanate nanotubes

A process for preparing molecular sieves of type Y faujasite structure is described, as well as pre-shaped bodies of faujasite structure type Y molecular sieves. The process comprises preparing a precursor gel from a source of silica-alumina or a source of alumina and a source of silica with a template agent at a SiO /Al O greater than 7 and suitable for forming a type Y zeolite, drying the precursor gel and contacting the dried precursor gel with steam, optionally followed by caustic washing, without the formation of crystalline phases other than type Y zeolite being observed. Advantageously, the pre-shaped bodies prepared with the precursor gel of Y zeolite, when subjected to the process of the invention, will have their outer surface covered by type Y zeolite crystals. The molecular sieves so obtained may be employed as catalysts or adsorbents in various processes of the chemical or oil industry.

Molecular sieves of faujasite structure

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Rio de Janeiro, Brazil

Gustavo Torres Moure