NEW PROCEDURE FOR SYNTHESIS OF ZINC-DIAMYL DITHIOCARBAMATES AS ADDITIVES FOR LIQUID FUELS

摘要

Invention herewith described refers to the new procedure for obtaining the liquid lubricant additives of zinc-diamyl dithiocarbamate of the general formula (I)in which C5H11 represents n-amyl or 2-methylbutyl group, which consists of 20% of zinc di-n-amyldithiocarbamate of the formula (II)in which n-C5H11 represents n-pentyl group, 18% of zinc di-2- methylbutyldithiocarbamate of the formula (III)in which izo-C5H11 represents 2-methylbutyl group, 62% of zink-2-methylbutyldithiocarbamate of the formula (IV)in which izo-C5H11 represents 2- methylbutyl group, and n-C5H11 – n-pentyl group, and is characterized according to this invention by: obtaining sodium salt (V) of diamyl dithiocarbamate acid (V)in the reaction of carbon disulphide (VI),CS2(VI)Mixture of diamylamine: 20% di-n-pentylamine (VII), 18% of di-2- methylbutylamine (VIII), 62% of 2-methylbutyl pentylamine (IX),and sodium hydroxide (X)NaOH(X)in water as a solvent, reacts with an aqueous solution of zinc sulphate heptahydrate (XI),ZnSO4•7H2Owhere after the reaction, the product is extracted using the extraction medium toluene, when the concentrate is obtained or using spindle oil when a commercial product is obtained as a 50% solution of zinc-diamyl dithiocarbamate in spindle oil with the most suitable molal ratio of amines, carbon disulphide, sodium hydroxide and zinc sulphate 1,0:1,0:1,0:2,0, at a temperature of 28°C to 30°C and reaction time of 0.5 hours (synthesis phase of sodium diamyl dithiocarbamate) and 50°C to 65°C and reaction time of 0.5 hours (synthesis phase of zinc-diamyl dithiocarbamate) and 0.5 hours (extraction phase of synthesized zinc diamyl dithiocarbamate using spindle oil).