The base stock of SE 15W/40 gasoline engine oil is composed of vacuum cut 2, refined oil and Dalian 500SN through searching the base oil produced from Nanyang fine chemical plant of wax and part of base oil bought from outside.
The basic oils were compounded in laboratory using C5～C15 light olefin,C8～C12 light olefin and light olefin cracked from 58# wax separately. The basic oil capability in lubecant was compared and the The infection of stuff olefin to basic oil capability in lubecant was researched.
Using the 2nd side-stream oil in vacuum distillation tower by Shengli cruae oil as basic oil and mixed with saturated hydrocarbon and aromatic component from Shengli vacuum residue as feedstocks the residue heat contact upgrading reaction is examined by contacting feedstocks with No.
2 fluidizable heat carrier in a fix-fluidized bed reactor. The results of reaction and dactylogram character analysis of feedstocks and their liquid products in gas chromatography show that the reaction of basic oil mainly belongs to vaporization, some hydrocarbons with large molecular weight are reacted by thermal cracking reaction character, some saturated with less than 25 numbers of carbon and aromaticses with less than 3 rings are reacted with little conversion, and other saturated hydrocarbons and aromaticses have more obvious thermal cracking character.
A possibility to prepare semisynthetic motor and industrial base oils of wide assortment is shown.
Three silicone base oils were also submitted to the same experimental programme.
Simple low molecular weight lubricant base oils can generate measurable and significant normal stress differences when sheared at high shear stress.
The epithioamides also frequently function as extreme pressure additives and antiwear agents for paraffinic or diester base oils, sometimes in both capacities for both base oils.
Sixty-one compounds, principally substituted fatty esters of mono- and polyhydric alcohols, but including some amides and two imidazolidines, were prepared and evaluated as lubricants and lubricant additives for paraffin and diester base oils.
We therefore investigate the performance of simple base stock policies.
Our approach aggregates several stages into one and uses a simple approximation to compute 'approximately optimal' base stock levels.
We present the results of a simulation study that tests the performance of our approximation in estimating the best base stock levels, and the performance of base stock policies as compared with the optimal policy.
In our model, the retailer uses a periodic review, base stock policy for ordering the item from the producer's Distribution Center (DC).
As part of the analysis we suggest a modification of the base stock policy for the positive lag lost sales case of periodic review inventory models that consistently outperforms the base stock policy in our numerical studies.