We can find that the sulfur content and aromatics content will reduce the quality of diesel oil, and the natural environment will be affected to a great extent. Therefore, at this stage, it is necessary to improve the quality of oil products and reduce their actual content, so as to effectively reduce environmental pollution and reduce harm to the human body.

Sulfur content

The element with the greatest environmental impact of diesel is sulfate, which is mainly composed of oxides emitted into the air combined with micro-particles. Diesel exhaust gas contains more than 40 kinds of harmful substances, of which 15 can be harmful to human health, and even carcinogenic. Low sulfur diesel and the use of converters can effectively reduce the emission of harmful substances. After the use of the converter, the sulfur content in diesel oil will be reduced to a certain extent. From 0.4% to 0.06%. The amount of particulate matter also decreased by 37 percent

Aromatics content

The content of polyaromatic hydrocarbons in diesel oil is high, and the value of cetane number is relatively lower, which is easy to produce nitric oxide and unburned hydrocarbons, thus increasing the overall content of PM in automobile exhaust. When the aromatics content was reduced from the original 41 percent to 21 percent, the nitric oxide content was also reduced by about 16 percent. In addition, when the PAHs were reduced from the original 7% to 2%, the particulate pollutants were also reduced by about 5%.

For the process waste oil to diesel re-refining plant,the sulfur content and aromatics content in the diesle meet the national standard request.