Title Page
Contents
ABSTRACT 12
국문초록 14
CHAPTER 1. Introduction 17
CHAPTER 2. Literature Review 19
2.1. Naphthalene Separation from Coal Tar 19
2.2. Benzothiophene Formation in Coal Tar 21
2.3. Extractive Distillation Method 23
2.4. Solvent Screening 25
2.5. Economic Analysis 27
CHAPTER 3. Distillation of Crude Naphthalene from Coal Tar 29
3.1. Introduction 29
3.2. Simulation 31
3.3. Results 36
3.4. Subconclusions 45
CHAPTER 4. Extractive Distillation of High-Purity Naphthalene using Sulfolane as Entrainer 46
4.1. Introduction 46
4.2. Simulation 48
4.3. Results 52
4.4. TAC Comparison with the Previous Research 63
4.5. Subconclusions 66
CHAPTER 5. Conclusions 67
REFERENCES 69
ATTACHMENT 74
[Attachment A] Data of naphthalene feed composition based on previous research for re-simulation purposes [1] 75
[Attachment B] Re-simulation of previous research[[1] to obtain economic analysis on the separation of naphthalene from coal tar using Aspen Plus software (process flow diagram). Total annual cost (TAC) = 3.22 × 10⁶$/year 76
[Table 2-1] Summary of previous simulation results 20
[Table 2-2] TAC calculations for economic evaluation 28
[Table 3-1] Coal tar feed compositions 33
[Table 3-2] Mass fraction results of distillate and bottom product in the secondary column 38
[Table 3-3] Primary and secondary column design parameters 43
[Table 3-4] TAC calculation of crude naphthalene distillation from coal tar 44
[Table 4-1] EDC and SRC design parameters 61
[Table 4-2] TAC calculation of high purity naphthalene distillation using extractive distillation method 62
[Table 4-3] Reported design process parameters of commercial naphthalene distillation 64
[Table 4-4] TAC calculation of commercial naphthalene distillation through ternary distillation columns 65
[Figure 2-1] Molecule structure of (a) naphthalene, (b) benzothiophene, and (c) di-benzothiophene 22
[Figure 2-2] Process flow diagram of extractive distillation with direct sequence 24
[Figure 2-3] Solvent screening guide using the "binary" feature in aspen plus software (a) Pseudo binary system activation and entrainer selection, (b) solvent... 26
[Figure 3-1] X-Y pseudo binary diagram for naphthalene/2,3-xylenol at 101.325 kPa 34
[Figure 3-2] PFD for separating crude naphthalene from coal tar 35
[Figure 3-3] Temperature profile at the second column 39
[Figure 3-4] Mole flow profile of vapor and liquid mole flow per stages at the secondary column 40
[Figure 3-5] Liquid composition profile of naphthalene and 2,3-xylenol per stages at the secondary column 41
[Figure 4-1] Pseudo-binary diagram for naphthalene-benzothiophene with 0.3 mole fraction of sulfolane at 101.325 kPa 49
[Figure 4-2] Residue curve map for naphthalene/benzothiophene/sulfolane system at 101.325 kPa 50
[Figure 4-3] PFD for separating high purity naphthalene by extractive distillation 51
[Figure 4-4] Effect of the number of stages to naphthalene distillate purity based on reflux ratio 54
[Figure 4-5] Effect of feed stage location to naphthalene purity based on entrainer feed stage from 18 to 54 55
[Figure 4-6] Effect of reflux ratio to naphthalene concentration at distillate and bottom of EDC 56
[Figure 4-7] Effect of reflux ratio to naphthalene purity, condenser, and reboiler duty at EDC 57
[Figure 4-8] Solvent to feed ratio effect to naphthalene purity, condenser, and reboiler duty at EDC 58
[Figure 4-9] Solvent to feed ratio effect to TAC 59