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This invention relates to a process for alkylating isobutane with olefins in the presence of a catalyst consisting of nickel, a very specific isoparaffin/olefin ratio and a halide of the alkali metals or alkaline earth metals.
2. Discussion of Prior Art
It is known to this art to alkylate isobutane with an olefin in the presence of a catalyst consisting of ruthenium, rhodium, palladium, nickel, platinum, etc. which, as described in French Pat. No. 1,489,823, comprises at least one nickel halide and at least one metal of the group of the alkali metals or alkaline earth metals.
Processes of this type require, however, total halogen atom replacement of the halides used. This implies that the catalyst is consumed more rapidly and does not have the same long life as if halogen atom replacement was not carried out. This is why these processes are carried out at temperatures higher than that of the alkylation zone, generally at least 50.degree. C. higher.
According to the teaching of U.S. Pat. No. 3,663,689, the olefin and isobutane are introduced in gaseous form into the reactor containing the catalyst, in the presence of molecular oxygen. However, the olefins injected in this way only react in the alkylation zone and are not even partially reacted because of the very low concentrations in the alkylation zone. On the contrary, the isobutane is completely alkylated and its concentration in the effluent from the reactor exceeds that of the injection of the isobutane and olefin in gaseous form.
In addition to the fact that the halogens from the halogen atom replacement are consumed at very high rates, the halogen atom replacement of the halides used is also followed by oxidation phenomena which produce water, carbon dioxide and various halogenated products.
In an alkylation process with an ole
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All brand names and trademarks mentioned in this site are the property of their respective owners.[EEG in pigmentation disorders of the oculi].
EEGs of patients with pigmentation disorders of the oculi were investigated in order to characterize the EEG. Three main types of the anterior visual pathway disturbance have been distinguished. In two thirds of the patients the epileptic activity started with a manifestation of the startle reflexes or of the epileptic headache. These patients developed full-blown epilepsy or suffered from chronic epilepsy with frequent epileptic seizures. The remaining patients developed partial seizures (generalized or, less frequently, only in the right or in the left eye).Szajno
Szajno is a village in the administrative district of Gmina Zielonkowice, within Strzelce-Drezdenko County, Lubusz Voivodeship, in western Poland. It lies approximately west of Zielonkowice, north-east of Strzelce Krajeńskie, and north-east of Gorzów Wielkopolski.
SzajnoThe genomes of Drosophila and yeast offer an opportunity to study the evolution of transcriptional control. The Drosophila genes, even-skipped, engrailed, and gap, have been isolated in yeast. We have characterized the cis- acting sequences responsible for the tissue-specific expression of the even- skipped gene. The cis-acting regulatory sequences required for engrailed expression are essential for gap activity, and the sequences required for gap activity are contained within the engrailed regulatory sequences. The Drosophila protein, even-skipped, is a transcriptional repressor, expressed in a complex pattern in the developing embryo. Part of the mechanism by which it acts is through a novel DNA