Saipem S.p.a.

Snamprogetti S.p.a.

Massimo Conte

Marco Di Girolamo

Maura Brianti

Domenico Sanfilippo

Roberto Catani

Antonio Sgambati

Alberto Cipelli

Ambrogio Gusberti

A process is described for obtaining high-purity 1-butene starting from Chydrocarbon mixtures containing isobutene, n-butane, isobutane, 1,3-butadiene, 1-butene, 2-butenes and also optionally Cand Chydrocarbons, comprising the following stages: conversion of isobutene effected in a double stage, wherein each stage consists of one or more reactors followed by a distillation column for the recovery of the reaction product; recovery of the excess alcohol; recovery of 1-butene using at least two distillation columns; characterised in that it also uses a further conversion stage, consisting of one or more reactors in series, for completing the isobutene removal.

Process for obtaining high-purity 1-butene from C4 hydrocarbon mixtures

A process is described for the separation of Chydrocarbons present, in a quantity ranging from 0.2 to 20% by weight, in streams prevalently containing Cproducts used for the production of high-octane hydrocarbon compounds, by the selective dimerization of isobutene, characterized in that the dimerization reaction is carried out in the presence of linear and branched alcohols and alkyl ethers in a quantity which is such as to have a molar ratio alcohols/alkyl ethers/isobutene in the feeding higher than 0.01.

Process for the separation of Chydrocarbons present in streams prevalently containing Cproducts used for the production of high-octane hydrocarbon compounds by the selective dimerization of isobutene

Process for the production of high-purity isobutene starting from a stream prevalently containing MTBE (Methyl-Tert Butyl Ether) or ETBE (Ethyl-Tert Butyl Ether) which essentially comprises the following areas in sequence: &#x2022; a fractionation area for obtaining a stream of high-purity MTBE or ETBE; &#x2022; a cracking area of said stream of MTBE or ETBE for obtaining an outgoing stream prevalently containing isobutene and the relative alcohol, methanol or ethanol; &#x2022; a washing area with water of the stream leaving the cracking area for the recovery of the relative alcohol, in order to obtain a stream containing isobutene, the ether fed and light compounds and a stream substantially consisting of water and relative alcohol, with a relevant fractionation section for separating the washing water to be recycled to the same washing area from the relative alcohol; &#x2022; a fractionation area of the stream containing isobutene, the ether fed and light compounds for separating a stream of high-purity isobutene. The process can be possibly integrated with a process for the production of MTBE or ETBE.

Process for the production of high-purity isobutene through the cracking of MTBE or ETBE and integrated process for the production of the relative ether

Process for the production of alkyl ethers by the etherification of isobutene, contained in C-Chydrocarbon streams, with linear alcohol, in the presence of acid catalysts, comprising the following essential steps: a) feeding the isobutene contained in C-Chydrocarbon cuts, together with one or more streams containing linear alcohol, to a first reaction step; b) sending the stream leaving the first reaction step to a first distillation area, separating a light stream from a heavy stream containing the desired ether; c) feeding the light stream separated in the first distillation area, together with one or more streams containing linear alcohol, to a second reaction step; d) sending the stream leaving the second reaction step to a second distillation area separating a light stream from a heavy stream containing ether, Chydrocarbons and alcohol which is recycled to the first distillation area; e) sending the light stream in the second distillation area to a recovery section of the linear alcohol contained therein; f) recycling the linear alcohol recovered in the recovery section to at least one of the two reaction steps. The present invention relates to plant solutions which allow the alcohol/isobutene molar ratio to be increased in the reaction steps and therefore maximizing the conversion of isobutene.

Process for the production of alkyl ethers by the etherification of isobutene

A tubular reactor is described, for catalytic reactions involving thermal exchanges, in particular for etherification reactions between branched olefins and linear alcohol, for dimerization reactions of branched olefins or cracking reactions, essentially consisting of a vertical tube-bundle exchanger whose tubes contain catalyst, having inlet and outlet nozzles for each passage side of the reagents, catalyst and thermal exchange liquid, characterized in that it has one or more metallic supports situated outside the lower tube plate in the lower part of the reactor for sustaining the catalyst so that the same catalyst is contained not only in the tubes of the tube-bundle but also in said lower part outside the lower tube plate and also in the upper part outside the upper tube plate.

Modified tubular reactor and process for effecting catalytic reactions involving thermal exchanges in which it is used

A process is described for the production of high-octane hydrocarbon compounds by means of the selective dimerization of isobutene, in the presence of Chydrocarbons and oxygenated compounds (branched alcohols or alternatively blends of linear or branched alcohols and alkyl ethers) characterized in that it utilizes a catalytic distillation as second reaction step.

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Process for the production of hydrocarbon blends with a high octane number by the hydrogenation of hydrocarbon blends, containing branched C, Cand Colefinic cuts, characterized by sending said blends, as such or fractionated into two streams, one substantially containing the branched Colefinic cut, the other substantially containing the branched Cand Colefinic cuts, to a single hydrogenation zone or to two hydrogenation zones in parallel, respectively, only the stream substantially containing of saturated Chydrocarbons, obtained by the fractionation of the stream produced by the single hydrogenation zone or obtained by the hydrogenation zone fed by the fractionated stream substantially containing the branched Colefinic cut, being at least partly recycled to the single hydrogenation zone or to the hydrogenation zone fed by the fractionated stream substantially containing the branched Colefinic cut, and the hydrocarbon blend with a high octane number, obtained by the fractionation of the stream produced from the single hydrogenation zone or obtained from the hydrogenation zone, being fed by the fractionated stream substantially containing the branched Cand Colefinic cuts.

Process for the production of hydrocarbon blends with a high octane number by the hydrogenation of hydrocarbon blends containing branched olefinic cuts

Growing community of inventors

Peschiera Borromeo, Italy

Massimo Conte