Sisas Societa Italiana Serie Acetica E Sintetica Spa

La Chemical Spa

Sisassocieta Italianaserie Acetica Sintetica

Davino Gelosa

Franco Codignola

Roberto Ruggieri

Massimo Morbidelli

Sergio Carra'

Elio Santacesaria

Gianni Carvoli

Giovanni Ranghino

Andrea Sliepcevich

Agostino Tricella

Process for the esterification of organic acids with alcohols in a reactor of the chromatographic type in which the heterogeneous solid phase is capable of acting both as an esterification catalyst and as a means exhibiting preferential adsorption towards one of the reaction products (typically water). The process to which the present invention relates is particularly improved compared with conventional technology owing to the use, as the means for regenerating the catalyst, of a desorbent to which has been added a second compound, generally the anhydride of the acid used in the esterification reaction, which, by chemical reaction, completes the removal of the adsorbed water.

Process for esterification in a chromatographic reactor

An oligomer of an aspartic acid is provided having repeating monomeric units of aspartic acid of the formula: ##STR1## and by a first chain unit having formula: ##STR2## and a chain stopper unit A which is: ##STR3## wherein X is an alkali metal, R represents H or an alkyl containing from 1 to 4 carbon atoms and R.sub.1 is H or the group --COOX.

Polymers of aspartic acid with sequestering activity process for their

There is provided a process for the separation of aromatic hydrocarbons mixtures into single components, in which the mixtures in vapor phase pass onto an adsorption bed formed by a potassium-exchanged Y zeolite, which is preventively saturated with desorbent vapors. According to the invention the desorbent used is isopropylbenzene in vapor phase. This facilitates the quick separation of the pure components, with the exception of the presence of desorbent. The process according to this invention is quicker in comparison to traditional ones. It requires the use of lower charges of desorbent and allows the separation of single pure components of the mixtures. It especially improves the paraxylene separation in higher concentrations with respect to the desorbent.

Process for the separation of mixtures of aromatic hydrocarbons into

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Travaco' Siccomario, Italy

Davino Gelosa