Please help calculate the heat required for the chemical raw materials used in the manufacturing process

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This post was last edited by yunduanyou_SSJU on 2017-11-27 at 14:55. I’m asking for help from the experts on this forum – I need to calculate the heat required for the epichlorohydrin reboiler (a shell-and-tube heat exchanger). The parameters are as follows:
T1310: Dehydrogenation tower; T1303: Reboiler of the same refining tower.
Process medium: Epichlorohydrin.
Density of the medium (kg/m3): 970, 950.
Medium flow rate (kg/h): 260, 250.
Inlet temperature of the medium (°C): 128, 150–160.
Outlet temperature of the medium (°C): 100 (under a negative pressure of 80 kPa), 100–160 (under a negative pressure of 80 kPa).
Specific heat capacity of the medium (kJ/(kg·°C)): …
Total steam flow rate (kg/h): …
Steam pressure (bar): 46.5.
Heat exchange area (m2): 13.1, 13.1.
Steam required (kg/h): …
Negative pressure flashing is involved, and I’m not sure how to calculate the heat required in this case. Thank you!