Caffaro S.p.a.

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

Liborio Casale

Giordano Donelli

Giuseppe Ghielmetti

Enrico Pontoglio

Sandro Parodi

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

In an improved process for the continuous production of tetrachlorophthalonitrile, of the type with activated carbon fluidized bed reactor, under whose grid melted and atomized phthalonitrile, chlorine, hydrochloric acid and possibly nitrogen are simultaneously introduced the use of a second static bed reactor, also of activated carbon, in series with the first, is provided for, thereby greatly improving the life of the catalyzer, and, above all, the quality of the product.

Process for the continuous production of tetrachlorophthalo-nitrile in

In an improved process of the continuous production of tetrachlorophthalonitrile, molten atomized phthalonitrile, chlorine, hydrochloric acid and possibly nitrogen are fed simultaneously below the grid of a reactor with a fluidized bed of activated carbon, and the tetrachlorophthalonitrile is separated and recovered continuously by simple cooling.

Process for the continuous production of tetrachlorophthalonitrile in a

The invention relates to an inorganic flocculating composition consisting of water soluble salts of Al, Fe, Mg and Ca and obtained by attacking clays containing the above chemical elements, the attack being carried out with an acid capable of forming water soluble salts of the said chemical elements. The said composition is capable of destroying the stability of colloidal slurries and can be employed without involving strict conditions, such as pH, temperature and so on.

Growing community of inventors

Brescia, Italy

Liborio Casale