石油产品添加剂酸值测定,多用颜色指示剂法,但该法不适用于有色石油产品添加剂酸值的测定。基于电位滴定及一般滴定的原理,提出了用电位滴定法来测定润滑油及其添加剂的酸值,继而考察了滴定溶剂、滴定速度、温度、搅拌速度及样品重量等诸影响因素。将一定量油样溶于50ml 1:1(V/V)异丙醇-甲苯的混合滴定溶剂中,于常温,控制搅拌速度(磁子搅拌)和滴定速度,用KOH异丙醇标准溶液(基准苯甲酸标定)滴定试样,测得滴定电位Emf(mV)和滴定体积V(ml)的关系,用二次微商计算法确定电位滴定终点,然后求得油样的酸值。一份油样的连 Determination of acid value of petroleum products additives, the use of multi-color indicator method, but the law does not apply to the determination of acid value additive for colored petroleum products. Based on the principle of potentiometric titration and general titration, potentiometric titration was proposed to determine the acid value of lubricating oil and its additives. Then the influence factors such as titration solvent, titration speed, temperature, stirring speed and sample weight were investigated. A certain amount of oil was dissolved in 50ml of 1: 1 (V / V) isopropanol-toluene mixed titration solvent at room temperature, the control of stirring speed (magnetic stirring) and titration speed, with KOH isopropanol standard solution Benchmark benzoic acid calibration) titration of the sample measured titration potential Emf (mV) and titration volume V (ml) relationship between the second derivative to determine the potential titration endpoint, and then obtained the acid value of the oil sample. A sample of oil