The number of investigation targets is about 200, the channels of acquiring the list of oil manufacturers are as follows:Use database of INFOBANK, and find out the list of oil manufacturers in Jiangsu province；Through relevant industry association such as China Lubricant Association, China Vegetable Grease Association and so on, acquire the oil manufacturers；Through manufacturing companies of activated clay, acquire the list of oil manufacturers who utilize activated clay；Through surveying the oil manufacturers of utilizing activated clay, identify the list of companies with more output in the same industry in the screening criterion is the utilization amount of activated clay, that is, based on whether oil manufacturers using activated clay, or the amount of using activated clay, to identify the investigation list of industry and oil manufacturers.As far as the ultimate aim of this investigation, it is more instructive to explore the utilization amount of activated clay than to explore the output of oil products. Confirmed by the suppliers of activated clay, we identify the 12 oil manufacturers in 4 industries as targets of this investigation.

As a kind of sorbent, activated clay mainly used in refinery and filtrate in oil manufacturing. The industries in the field of vegetable oil, animal oil, oil refinery, lubricant and so on, extensively use activated clay as their additive of production.The application of activated clay in vegetable oil industry concentrates on production of salad oil. Jiangsu is the biggest salad oil production base, and a batch of salad oil manufacturers with the output of more than 10,000 tons gather here.The application of activated clay in animal oil industry concentrates on soap-made companies and food additive companies. Currently, there are no food additive companies to use activated clay in Jiangsu province. Hence, the investigation about animal oil industry focuses on the soap-made companies. Companies in oil refinery industry in Jiangsu are mainly Jinlin Petrol-Chemical Corp and Yangtze Petrol-Chemical Corp. Currently, the amount of consuming activated clay in these two companies is not very large.Whether the industry lubricant or auto lubricant, it is manufactured by mixing basic oil and additive. It has no use for activated clay in producing industry lubricant and auto lubricant. Activated clay only used in the production of basic oil of lubricant. Hence, the investigation focuses on the field of manufacturing companies of basic oil of lubricant.None of top 26 manufacturing companies of basic oil of lubricant in China are located in Jiangsu province. There are only some small-sized manufacturing companies of basic oil of lubricant. The two companies listed on the report can be classified into small-sized privately owned manufacturing companies of basic oil of lubricant.