Overbased calcium carbolxylates and sulfonates and process for making same

A process for preparation of an overbased calcium carboxylate or calcium sulfonate soap, the process comprising at least the following steps:

• (a) preparing a first mixture comprising at least one non-polar organic solvent, at least one first polar organic solvent and a catalyst;
• (b) preparing a second mixture comprising at least one of:
• between 20 wt. % and 90 wt. % of C7 to C25 carboxylic acids, which are optionally branched on carbon 2;
• between 1 wt. % and 20 wt. % of C2 to C6 carboxylic acids,
• and
• optionally between 5 wt. % and 90 wt. % of alkyl benzene sulfonic acids;
• the wt. % being by weight of total acid;
• (c) adding an amount of a calcium base to the first mixture of step (a) to obtain a third mixture;
• (d) adding the second mixture of acids of step (b) to the third mixture of step (c) to obtain a fourth mixture;
• and
• (e) carbonating the fourth mixture of step (d) by adding therein a given amount of an organic carbonate;
• wherein in step (c), the added amount of the calcium base allows neutralization of the carboxylic acids in step (d) and forms water as a neutralization product;
• and
• wherein the process is free of carbon dioxide injection for carbonation.