Patent ID: 9605230
Date: 2017-03-28
CPC Classifications: C10M,C10N

Claim:
1. A method for improving the thermal stability of a composition, said composition containing an oil, subjected to variations in temperature, which comprises adding at least one zeolitic adsorbent, in the form of a powder formed of zeolite(s) or of agglomerate(s) formed of zeolite(s) to the composition, wherein the at least one zeolitic adsorbent is free of metal impregnation and the at least one zeolitic adsorbent is based on zeolite(s) A exchanged with potassium, the degree of exchange of which is between 50% and 70% (reported as molar equivalents) of all of the exchangeable cationic sites, wherein the at least one zeolitic adsorbent is present in an effective amount to limit or reduce the total acid number of the oil and the effective amount is about 40 mg to about 1000 mg per 5 g of oil.