การนำกลับมาซึ่งน้ำมันหล่อลื่นพื้นฐานและแวกซ์ดิสทิลเลต โดยกระบวนการสเวตติง / สุริยัน หวังอุดม = Recovery of lube base oil and wax from wax distillate by the sweating process / Suriyun Whungudom
This thesis studied the recovery of lube base oil and wax from wax distillate by sweating process. Wax distillate is by-product of lube base oil distillation. Its oil content is higher than that of market requirement. Thus oil needs to be separated. According to this study, each sample needs to be sweated twice. In order to obtain the satisfactory percentage of oil content. The parameter considered in the study comprises sweating temperature interval, sweating time and heating rate. Sweating temperature interval affects the most on separating oil from wax distillate. Inappropriate temperature led to poor sweat, then affected to percent yield of wax. Moreover, for wax distillate 60N in the first sweating temperature interval is 30-48 ℃ and second sweating is 36-48 ℃. For wax distillate 150N in the first sweating temperature interval is 34-53 ℃ and the second one is 40-53 ℃. Sweating time is of minor effect to the process. If spending too much time, will be wasted energy. From the experiment, the appropriate sweating time, for the 1st sweating is 12 hours, and the 2nd sweating, 12 hours. The percentage of oil content in the final wax distillate are 0.68 percent and 0.60 percent for 60N and 150N respectively which yield better product quality than market requirement, the standard value requires 1.0 percent oil content. Wax distillate 500N and 150BS, was found that the oil can not be separated by this process. Finally, heating rate is also was important parameter. Low heating rate yields better final product quantity.
