Preparation of biodiesel by a two-step catalyzed method from waste cooking oil with high acid value;

Influence factors of high acid value in the preparation of rice bran oil;

Discussion on testing method of PTA acid value;

Introduce the composition of naphthenic acid and two methods about the determination of acid number.

It is researched the linear sweep Voltammetry(LSV)to determinate acid number of lubricating oil,the result exhibits the repeatability and reappearance ability of linear sweep Voltammetry can satisfy the requirements of GB/T264.

The amidation reaction was carried out at 170 ℃ for 150 min to give the prepolymer of polyamide with acid number of 37.

Based on the problems of low viscosity index and the acidity increasing in the lubricating base oil,it has been found that the unstable quality of the crude oil was the root cause to effect on the quality of the base oil by analysis for long time;the low viscosity index and the higher acidity were resulted from the low paraffinicity and the high content of aromatics,cyclane.

The items of saponification numbers and acidity of the synthetic beeswax made from catalyze-oxidation of paraffin were tested and discussed by four standard-testing methods.

Potentiometric determination of the acidity of petroleum products in non-aqueous matrix is reported.