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1 SURVEY OF CHEMICAL EMISSIONS Table 37 gives the results of this 5-level analysis for acetic acid production. In the carbonylation section, CO, methanol, and catalyst are fed. Unreacted gases are scrubbed. This appears to be a good location for energy capture from emissions. The energy for feedstock production has not been included, since it is not part of our analysis. There is a net savings of 9% of total energy using Level 3 process design and Level 2 heat integra- tion improvements. Comparing Level 0 results with Level 4 indicates that fuel consump- tion for energy generation is quite high for this exothermic process. Therefore, there is a high potential for energy capture both in terms of heat and as chemical energy content of the emissions. The amount of raw materials fed is 35% in excess of the theoretical need. Recovery of byproducts such as propionic acid and emissions is very important. As a comparison, Table 38 provides the results of this 5-level analysis for maleic anhydride production. Table 37. Energy Performance Levels (Btu/lb) for the Production of Acetic Acid Electricity Hot utility Hot utility credit Net Power & Hot Utility Fuel for electricity Fuel for steam/heat transfer fluid Total fuel energy Fuel energy credit Net fuel energy consumed Raw material energy Total energy for process Base Process Level 0 103 1555 -363 1295 333 2692 3025 -572 2452 1173 3625 Heat Integration Improvements Level 1 103 1555 -363 1295 333 2692 3025 -572 2452 1173 3625 Level 2 103 1555 -363 1295 333 2650 2982 -572 2411 1173 3584 Process Redesign Level 3 148 1391 -401 1138 476 2275 2751 -632 2120 1173 3293 Theoretical Energy Level 4 -867 867 0 33PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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