Enichem Anic S.p.a.

Enichem S.p.a

Enichim Anic S.p.a.

Giovanni M Sechi

Giuseppe Messina

Loreno Lorenzoni

Paolo Calaresu

Vittorio Bruzzi

Giovanni Chessa

Silvio De Micheli

A continuous process for the production of oxamide is based on the catalytic oxidation of hydrogen cyanide with oxygen or air in a strong excess in a solution of copper nitrate in water-acetic acid. The process is carried out in a vertical tubular reactor, with continuous recycling of part of the suspension of oxamides from the bottom to the top of the reactor.

Production in continuous of oxamide for the catalytic oxidation of HCN

A new process for preparing oxalyl- and oxamyl-hydrazides which comprises contacting oxamide or diacetyloxamide with the corresponding hydrazine derivative of formula

Process for the preparation of oxalyl- and oxamyl-hydrazides

A new process is described for the preparation of oxalic acid esters and amides of general formula (I) ##STR1## wherein Z designates an --OR or --NR.sup.1 R.sup.2 group, wherein R represents substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, R.sup.1 is hydrogen or substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, R.sup.2 represents substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, or R.sup.1 and R.sup.2 taken together with the adjacent nitrogen atom represent a saturated 5-, 6-, 7-, or 8-membered heterocyclic ring, which may contain an additional heteroatom selected from --O--, --S--, and --N(H, Alkyl)--, and optionally bear one or more alkyl or alkenyl substituents, and

Method of preparation of oxalic acid esters and amides

A process is described for the preparation of oxamide derivatives wherein one or both --NH.sub.2 groups are replaced by primary or secondary amino groups, through reaction of oxamide with a suitably selected amine of formula RR.sup.1 NH wherein R represents a substituted straight or branched (C.sub.2 -C.sub.12)alkyl radical wherein the substituent(s) or at least one of the substituents is selected from the group consisting of hydroxy, amino, mono-substituted amino, and di-substituted amino, and R.sup.1 represents hydrogen or an optionally substituted (C.sub.1 -C.sub.6)alkyl radical; representative oxamide derivatives which can thus be obtained useful as corrosion inhibitors, intermediates for polymers, polymer stabilizers, and slow-release fertilizers, are also described.

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Ozieri, Italy

Giovanni M Sechi