The purposes of this research were to investigate the factors consisted of a temperature different parts of the lemongrass and a size of chopped lemongrass that affected to distillation of lemongrass essential oils. There are two experiments in this work. The first experiment investigated the factors by defining 1) temperature at 105 oC and 110 oC 2) different parts of the lemongrass (Leaves and trunk) and 3) sizes of chopped lemongrass at 1-2 cm and 15-20 cm respectively. 2k Factorial designs method was used for this experiment. In the second experiment the appropriate parameters from experiment 1 were used for 3 replicates to find an average of lemongrass essential oils. The results of first experimental analysis showed that the appropriate parameters were temperature parts of the lemongrass and sizes of chopped lemongrass at 110 oC leaves and 1-2 cm respectively. For the result of experiment 2 it was found that the average of lemongrass essential oils was 30.36 ml.

The objective of this work was to study the feasibility of recovery N-Methyl-Pyrrolidone (NMP) and acetone solution in cleaning the slider fabrication process in the manufacturing process of hard disk drive by distillation. The operating parameters such as pressure (50 - 500 mbar) temperature (60 - 110 C) and time (20 - 70 minutes) were investigated. The highest purity of solution was ca 98.12 %of N-Methyl-Pyrrolidone at 110 C 200 mbar with 30 minutes that it is sufficiently purity to be re-used. This solution could be produced with 0.33 Liter/hour with 405 Baht/Liter (excluding investment cost) that would be saved 565 Baht/Liter and environmentally friendly with clean technology.