化工专业英语论文

Lubricating oil clay refining process

Clay refining as the effective method of improving oil color, anti-emulsification degree, anti-oxidation stability and insulation performances,is widely used in the process of lubricating oil, wax and waste lubricating oil regeneration. Although the lube oil hydro-treating process has many advantages, and has been partially replaced the clay refining, the latter is still necessary for some special lubricating oil processing, and occupy a certain position in the new lubricating oil factory.

Lubricating oil clay refining unit is using activated clay has good selective adsorption, fully mixed with oil in high temperature, the adsorption of colloid and asphaltene in oil is not ideal component, thereby improving the oil color, carbon residue, anti-oxidation stability, corrosion resistance, anti-emulsification degree, improve their performances. Lubricating oil carclazyte purification device is the key device to improve the quality of lubricating oil production process. This paper mainly introduces the process and characteristics of Chinese oil Karamay Petrochemical Company lube oil clay refining unit.

Technological process:

Clay refining process is a powdery clay mixing the feedstock to form a suspension, which heated to a certain temperature by a heating furnace, then into the evaporator to maintain a certain time to reach adsorption equilibrium after filtration to remove the spent bleaching earth, finally refined oil has been got. The process mainly includes 3 main processes, which are the raw material oil and clay mixing, heating refining and filtration separation.

Processes raw oil into the oil from the clay refining feedstock tank, the material pumped into the mixing tank,white clay soil from the tank through the clay feeder system add into a mixing tank and mix with oil proportionally. The mixture of clay and oil in the mixing tank are pumped into the furnace ,after heated to the required temperature, into the evaporation stripper.

Oil and clay to maintain a certain contact time in the tower , the vacuum system generates negative pressure,evaporating the water and light components in the mixture of clay and oil, then the light fraction and water through the steam out of top cooler cooling to 45 ℃, flow to the vacuum liquid separation tank for oil-water

separation.The non-condensable gas in vacuum liquid separation tank top is extracted by vacuum pump, to maintain the system vacuum.Vacuum liquid separation tank below the oil and water into the oil-water separation tank, oil and water separation by density difference of oil and water, dehydrated oil flows into the dirty oil tank regularly output from the device.

After the stripping, tower bottom oil pumped out, through a heat exchanger and exchange heat with the feedstock, after cooler,and then to conduct a primary plate filter to filter out most of the clay in slurry oil.Once oil slurry filtered into the transition tanks, pumping by the pump to the secondary filter to filter out the remaining clay or other impurities in the oil into semi-finished product tank, and then pumped out ,finally, after a cooler cooling to 60 ~70 ℃output from the device.

Technological characteristics:

The first:Clay uesing negative pressure suction mode,which uses a vacuum pump to generate a negative pressure, the clay from the warehouse direct inhalation hopper to avoid positive operating result in dust flying, working to improve the feeding environment.

The second:In order to ensure that qualified mechanical impurities content of products, filtration system uses a two-stage filtration. Primary filter using frame filter, this filter filtered through filter cloth , most of the clay in the primary filter be filtered out, but not able to make the clay content in the oil dropped to the specified index , in order to ensure oil quality, also need to use filter paper as a filter medium for further filtration,that is two level filter.

The third:Clay feed metering system adopts sensors weighing feeder,using PLC programmable controller automatically control, weighing system used precision pneumatic weighing technology, making feeder accurate measurement, and easy to operate.

Anyhow, lubricating oil clay refining technology still has some advantages, there are still widely using in some special processing, as long as the further improvements, its usefulness will be greatly increased.