12505 running status 12505 train 12505 train running status north east ex today's time of northeast express up northeast sf express running status.
Refining is the process of reducing the impurities in a substance. You can't turn crude oil into gasoline without first refining it. Refining is nowadays most commonly associated with the processing of petroleum products such as oil and gas, but it also applies to precious metals, especially those used in jewelry. Sugar is another substance that undergoes refining, which makes it less grainy and more consistent.
Refining of crude oils or petroleum essentially consists of primary separation processes and. secondary conversion processes. The petroleum refining process is the separation of the different. hydrocarbons present in the crude oil into useful fractions and the conversion of some of the. hydrocarbons into products having higher quality performance. Atmospheric and vacuum.