Enichem S.p.a

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Atochem

Renato Paludetto

Gianni Donati

Roberto Trotta

Raymond Commandeur

Bernard Jean Gurtner

Gastone Del Piero

Massimo Morbidelli

Gianni Pandolfi

Sergio Carra

Alfredo Orsi

Giuseppe Bellussi

Franco Rivetti

Ugo Romano

Carlo Perego

Paolo Pollesel

Caterina Rizzo

Renzo Bignazzi

Maura Brianti

Luciano Carluccio

Giuseppe Storti

Patrizia Ingallina

Giancarlo Paret

Eugenio Andreoli

Guiseppe Storti

Gianluca Girardi

Paolo Chiudaroli

A process for separating mixtures of hydrocarbon isomers on molecular sieves, including providing columns which include molecular sieves and function alternatively as secondary adsorption, primary adsorption, and desorption devices, feeding the mixtures of hydrocarbon isomers to a column functioning as the primary adsorption device for adsorbing isomers with greater selectivity towards the molecular sieves, feeding effluent of the mixtures from the column functioning as the primary adsorption device to a column functioning as the secondary adsorption device for adsorbing remaining isomers with greater selectivity, discharging isomers with a lower selectivity from the column functioning as the secondary adsorption device and a desorbing agent therein, feeding a desorbing agent to the column functioning as the desorption device, discharging isomers with a greater selectivity towards the molecular sieves and the desorbing agent in the column functioning as the desorption device.

Process for separating mixtures of hydrocarbon isomers in gas phase on molecular sieves

Catalyst for steam cracking reactions and related preparation process

Catalyst system for the oxidative dehydrogenation of alkylaromatics or paraffins to the corresponding alkenylaromatics or olefins

Integrated process for the production of butene-1 which comprises feeding a C.sub.4 hydrocarbon stream to a separation unit of butene-1 and recycling the remaining stream to the same unit after treatment in a bond isomerization section to convert the remaining butenes-2 into butene-1, a molecular sieve separation unit is inserted in the cycle operating with the hydrocarbons in a vapour phase, for the purge of the paraffins.

Integrated process for the production of butene-1

The present invention relates to a continuous process for the preparation of phenyl methyl carbonate. The process is carried out in a first distillation column consisting of a lower reactive section and an upper rectification section and a second rectification column. The reactive section of the first column has a practically constant thermal profile at the optimum temperature for the reaction, and that with the use of the second column a circulation of dimethyl carbonate is created between the top and bottom of the first column which allows an advantageous excess of dimethylcarbonate to be fed to the bottom of the first column.

Continuous process for the preparation of phenyl methyl carbonate

Integrated process for the production of ter-amyl alkyl ethers which comprises the feeding of a C.sub.5 hydrocarbon stream to an etherification reactor and the recycling of the remaining stream to the same reactor, after treatment in an isomerization section to convert linear pentenes into reactive isoamylenes. An absorption section on molecular sieves is inserted between the etherification reactor and the isomerization section to eliminate inert hydrocarbons, basically i-pentane and n-pentane.

Integrated process for the production of ter-amyl alkyl ethers

An integrated process for the simultaneous production of alkyl tert-butyl ethers and 1-butene, comprising feeding a C.sub.4 hydrocarbon stream to an etherification unit and recycling the remaining stream to the same unit after possible separation of the 1-butene and treatment in an isomerization section to convert the remaining butenes into isobutene, a molecular sieve separation unit operating with the hydrocarbons in the vapour phase being incorporated into the cycle.

Integrated process for the simultaneous production of alkyl tert-butyl

A processing cycle for separating C.sub.8 aromatics (mixtures of ortho-, para-, meta-xylene and ethylbenzene) is disclosed, in which a first subdivision of the mixture is preformed into two streams respectively comprising: para-xylene and ethylbenzene as the first stream; and meta- and ortho-xylene as the second stream followed by a separation of the first stream by rectification, during which ethylbenzene within specifications is obtained as the overhead fraction, with the second stream also being sent to a separation by rectification, with ortho-xylene within specifications being obtained as the bottom fraction. The possible content of C.sub.9 species can be furthermore removed by subsequent distillation.

Process for separating mixtures of aromatic C8 hydrocarbons

The process for the separation of isomeric dichlorotoluenes, comprising the steps of:

Process for the separation of isomeric dichlorotoluenes

A process for separating dichlorotoluene isomers from a mixture containing at least two dichlorotoluene isomers comprising

Process for separating isomeric dichlorotoluenes by adsorption

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Pioltello, Italy

Renato Paludetto