The invention relates to a process for preparing an overbased metal detergent in an oil medium comprising the steps of: (1) providing a metal salt selected from the group consisting of a hydrocarbyl-substituted organic acid; a hydrocarbyl-substituted phenol, a phenate, a hydrocarbyl-substituted carboxylate and mixtures thereof; (2) further providing methanol and a mixture of alcohols containing 2 to about 7 carbon atoms, wherein the mole ratio of methanol to the mixture of alcohols is about 2.2 or less, to form a mixture; (3) further providing a basic metal compound; (4) reacting the mixture of step (3) with carbon dioxide to form a carbonated overbased metal sulphonate; (5) performing steps (3) and (4) at least three additional times upon the product of step (4); (6) thereafter removing at least a portion of the water produced in steps (1)-(5) and of the alcohols introduced in step (2); (7) performing step (2) again, upon the product of step (6); (8) performing steps (3) and (4) at least two additional times upon the product of step (7); and (9) thereafter removing a substantial portion of the water and of the alcohols from the composition; wherein the oil medium is present in an amount such that the weight ratio of the acid corresponding to the metal salt of (1) to the oil medium is 0.3 to 1.4; and wherein step (6) is required when the hydrocarbyl-substituted organic acid is a hydrocarbyl-substituted sulphonic acid. The invention further relates to its use in internal combustion engines.
该发明涉及一种在油介质中制备过基
金属
清洁剂的方法,包括以下步骤:(1)提供一种选自羟烃基取代有机酸、羟烃基取代
酚、
酚酸盐、羟烃基取代
羧酸盐及其混合物的
金属盐;(2)进一步提供
甲醇和含有2至约7个
碳原子的醇混合物,其中
甲醇与醇混合物的摩尔比约为2.2或更低,形成混合物;(3)进一步提供一种碱性
金属化合物;(4)将步骤(3)的混合物与
二氧化碳反应,形成
碳酸盐过基
金属
磺酸盐;(5)对步骤(4)的产物至少进行三次以上的步骤(3)和(4);(6)随后至少去除步骤(1)至(5)中产生的部分
水和步骤(2)中引入的醇;(7)对步骤(6)的产物再次执行步骤(2);(8)对步骤(7)的产物至少进行两次以上的步骤(3)和(4);(9)随后从组合物中去除大部分
水和醇;其中油介质的量使得步骤(1)中
金属盐对应的酸与油介质的重量比为0.3至1.4;当羟烃基取代有机酸为羟烃基取代
磺酸时,需要步骤(6)。该发明还涉及该方法在内燃机中的应用。