Recovery of Benzene

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PROJECT 1: Recovery and Purification of benzene from Naphtha and C5+ Catalytic Reforming gasoline streams using extractive distillation.

Prepared for:
CHE4049F, Process Synthesis and Equipment Design
2013

Prepared by:
HLTSIB003

02 March 2013

Table of Contents
1. PROCESS SUMARRY1
2. PROCESS SYNTHESIS2
2.1 Eliminate Differences in Molecular Type2
2.2 Distribute Chemicals by Matching Sources and Sinks3
2.3 Eliminate Differences in Composition4
2.4 Eliminate Differences in Temperatures, Pressures and Phase changes5
2.5 Integrate tasks (Combine tasks and assign unit operations)6
3 PROCESS FLOW DIAGRAM7
3.1 Process Flow Diagram7
3.2 Equipment list8
3.3 Stream Table9
4 RATIONALE10
5 THINKING ABOUT THE PROCESS11
6 HEALTH, SAFETY AND ENVIRONMENTAL IMPACT EVALUATION12
7. APPENDICES13
8. REFERENCES14

LIST OF FIGURES
Figure 1 Preliminary flowsheet for process synthesis step one for the benzene purification process………........................................................................………………………………..…..2
Figure 2 Flowsheet showing a distribution of chemicals for the benzene purification process.3
Figure 3 Flowsheet including the separation operations for the benzene purification process.4
Figure 4 Flowsheet with temperature, pressure, and phase change operations in the recovery and purification of benzene.5
Figure 5 Flowsheet showing task integration for the6
Figure 6 Process flow diagram of the recovery and purification of benzene.7
Figure 7 False Tree Analysis that summarizes the failure logic to the distillation column damage or explosion.12 LIST OF TABLES
Table 1 Equipment list for the major units of the recovery and purification of benzene.8
Table 2 Stream table for the recovery and purification process.9
Table 3 Physical properties and split ratios of each component13 WORD COUNT = 1900
1. PROCESS SUMARRY

The process of recovering and purification of benzene from Naphtha and C5+ catalytic reforming gasoline starts with the mixing the two streams from their respective storage tanks. Pressure and temperature of the mixture is adjusted to meet the operating condition of the distillation column. The mixed stream is then fed into Naptha-C5+ gasoline distillation column to separate benzene rich stream from all aromatic and heavy alkanes. The overhead is then sent to the Morpholine extractive distillation column to extract benzene from the benzene rich stream. The paraffinic raffinate as overhead product of extractive distillation is pumped to the storage tank while the bottom stream is pumped to solvent recovery column to yield benzene, and the solvent is recycled. The bottom stream from Naptha-C5+ gasoline distillation column is then pumped to the Aromatic distillation column that separates aromatic gasoline from heavy feed aromatics.

2. PROCESS SYNTHESIS
2.1 Eliminate Differences in Molecular Type

Recovery and purification of benzene from naphtha and C5+ catalytic reforming gasoline is a continuous process since a large production of the product is desired. The operation to eliminate the differences in molecular type is outlined in figure 1 below. However, it should be noted that the recovery and purification of benzene using aromatic extraction process does not involve chemical reaction.

Figure 1 Preliminary flowsheet for process synthesis step one for the benzene purification process.

The process operation to eliminate differences in composition and to eliminate differences in temperature, pressure and phase change will detail the operation of the recovery and purification of benzene process in section 2.2 and 2.3, respectively.

2.2 Distribute Chemicals by Matching Sources and Sinks

A detailed illustration of the operations to distribute chemicals by matching sources and sink is outlined below by figure 2. Naphtha and C5+ catalytic reforming gasoline streams are mixed to eliminate the...
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