Process Description
The objective of the SPM-600 Unit Operations of Chemical Processing Simulation is to blend the two paraffins hexane (C6) and heptane (C7) to a specific product composition by pumping them into a mix tank.
The mixture is then pumped from the bottom of the mix tank through a countercurrent tube and shell type heat exchanger where the temperature of the process fluid is raised. The mixture is then separated into its constituent components in a flash tank by virtue of the difference in the boiling point temperatures of hexane (C6) and heptane (C7). The separated products are then sent to other units for further processing.
Instrumentation
The hexane feed flow loop is outfitted with upstream and downstream pressure indicators (PI-201 and PI-203). Pump discharge pressure (PI-202) is also provided. Flow is controlled by flow controller FIC-201. A composition analyzer measures weight percent hexane and heptane (AI-301 and AI-302 respectively). Feed temperature is measured by TI-401.
The heptane feed flow loop is outfitted with upstream and downstream pressure indicators (PI-204 and PI-206). Pump discharge pressure (PI-205) is also provided. Flow is controlled by flow controller FIC-202. A composition analyzer measures weight percent hexane and heptane (AI-303 and AI-304 respectively). Feed temperature is measured by TI-402.
Block valves V-201, V-202, V-203, and V-204 can be opened and closed with switches HV-201, HV-202, HV-203, and HV-204 respectively.
Primary feed pumps P-201 and P-203 can be turned on and off with the switches HS-201 and HS-203 respectively. Spare feed pumps P-202 and P-204 can be turned on and off with the switches HS-202 and HS-204 respectively.
Mix tank level is maintained by level controller LIC-301. Mixture composition is measured by AI-305 (WT % C6) and AIC-306 (WT % C7). Mixture temperature is indicated by TI-403.
Mixture pumps P-301 and P-302 can be turned on and off with the switches HS-301 and HS-302 respectively. Pump suction (PI-301) and pump discharge (PI-302) pressure indicators are provided. Mixture flow is controlled by flow controller FIC-401.
The process outlet of the heat exchanger is outfitted with a temperature indicator (TIC-406).
The ThermOil loop is also outfitted with inlet and outlet temperature indicators (TI-404 and TI-405). ThermOil flow is modulated by temperature controller TIC-406. TIC-406 controls the outlet temperature of the process loop.
Block valves (HV-401 and HV-402) are provided for the ThermOil flow loop.
The overhead vapor line is outfitted with a composition analyzer that measures weight percent hexane and heptane (AI-501 and AI-502 respectively). Flash Tank pressure is regulated by pressure controller PIC-501. Vapor rate is measured by FI-501. Vapor flow can be blocked in by block valves HV-501 and HV-502. Downstream pressure is measured by PI-502.
The bottoms liquid line is outfitted with a composition analyzer that measures weight percent hexane and heptane (AI-503 and AI-504 respectively). Flash Tank level is controlled by level controller LIC-501. Liquid rate is measured by FI-502. Tank temperature and tank bottom pressure are measured by TI-501 and PI-503 respectively. Liquid flow can be blocked in by block valves HV-503 and HV-504. Downstream pressure is measured by PI-504.