GB/T 7304-2014 (English Version) PDF

Standard No.: GB/T 7304-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 7304-2014
Replace: GB/T 7304-2000

Scope: This standard specifies two methods for determining the acid value of petroleum products, lubricants, biodiesel and biodiesel blended fuels by potentiometric titration. Method A is suitable for the determination of the acid value of petroleum products and lubricants that can be dissolved and basically dissolved in a mixed solvent of toluene and anhydrous isopropanol. Method A can determine those acidic components in the sample whose dissociation constant is greater than 1×10^-9 in water, very weak acids with dissociation constant less than 1×10^-9 will not interfere, but the hydrolysis constant is greater than 1 The salts of ×10^-9 will participate in the reaction. The precision of method A is established in the range of acid value (calculated as KOH) from 0.1 mg/g to 150 mg/g. Method B is suitable for the determination of the acid value of biodiesel and biodiesel blended fuels with low acidity and large difference in solubility. This standard can reflect the relative changes of oil products under oxidative conditions during service without considering the changes of color and other properties. Although the titration is carried out under specific conditions, this standard cannot be used to determine the absolute acidity of the oil to predict its performance under service conditions. There is no necessary connection between the acid value and bearing corrosion.

GB/T 7304-2014 Referenced Document

GB/T 4756 Method for manual sampling of petroleum liquids*， 2015-12-31 Update
GB/T 4945 Standard test method for acid and base number of petroleum products and lubricants by colour-indicator titration
GB/T 6682-2008 Water for analytical laboratory use.Specification and test methods
SH/T 0079 Preparation method of reagent solution for petroleum product test
SH/T 0163 Determination of total acid value of petroleum products (semi-micro color indicator method)
SY/T 5317 Petroleum liquids. automatic pipeline sampling

2014 GB/T 7304-2014 Standard test method for acid number of petroleum products by potentiometric titration
2000 GB/T 7304-2000 Petroleum products and lubricants-Determination of acid number-Potentiometric titration method