Caffaro S.p.a.

Caffaro, S.p.a., Societa Per L'industria Chimica Ed Elettrochimica

Caffaro S.p.a. Societa Per L'industria Chimica Ed Electtrochimica

Enrico Pontoglio

Sandro Parodi

Giancarlo Caretti

Giordano Donelli

Giuseppe Ghielmetti

Liborio Casale

Process for purifying, by crystallization, TAED having a titer.gtoreq.99.5% from a mixture containing crude TAED obtained by acetylation of DAED, wherein the purification process is performed in two different stages (1, 2), characterized in that the temperatures at which the stages are performed differ from one another (delta t) by values comprised between 55.degree. and 110.degree..

Taped purification process

The present invention relates to a process for the preparation of 3-cyano-3,5,5'-trimethyl-1-cyclohexanone by means of the reaction of isophorone with an alkaline cyanide. The reaction is performed starting from isophorone and an equivalent amount of cyanide in a homogeneous water/organic solvent solution at a temperature comprised between 20.degree. C. and the reflux temperature, maintaining a pH between 14 and 8 by means of a gradual addition of an inorganic acid during the reaction.

Process for the preparation of 3-cyano-3,5,5'-trimethyl-1-cyclohexanone

The present invention relates to a process for the continuous production of isophthalodinitrile or terephthalodinitrile by reaction in steam phase, on a fixed bed of a dehydration catalyst, of the correspondent bis(trichloromethyl)benzenes with ammonia optionally in the presence of aqueous steam.

Process for the continuous production of phtalodinitrile

The present invention relates to a process for the production in continuous of isophthalodinitrile or terephthalodinitrile by simultaneous amidation and dehydration of the respective acid chlorides in steam phase on a fixed bed of a dehydration catalyst.

Process for the production in continuous of phthalodinitrile

The invention relates to a process for the preparation of tetrachloroterephthaloyl dichloride by means of the chlorination of terephthaloyl dichloride with gaseous chlorine, characterized in that said chlorination is carried out in the vapor phase in the presence of activated charcoal as catalyst. The invention relates also to the synthesis processes in which the compound prepared according to the process said is used as an intermediate.

Process for the preparation of tetrachloroterephthaloyl dichloride by

The present invention relates to a process for the continuous production of isophthalodinitrile by amidation and simultaneous dehydration of the dimethyl ester of isophthalic acid in vapor phase on the fixed bed of a dehydration catalyst.

Process for the continuous production of isophthalodinitrile

Method for removing chlorinated solvents from chlorinated polymers which retain them as a result of a chlorination process, wherein after being dried and pulverized, said chlorinated polymer is treated with a non-halogenated aliphatic organic solvent or a halogenated aromatic organic solvent. Said organic solvent pertains to the following groups: alcohols such as methanol, ethanol, isopropanol; esters such as methyl formate, ethyl formate, methyl acetate; nitriles such as acetonitrile; aromatic halides such as chlorobenzene; hydrocarbons such as n-hexane; and acetone.

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Brescia, Italy

Enrico Pontoglio