A methanol-based process for producing 30,000 tons of diol per year; it replaces copper washing. What are the energy-saving benefits of this approach?

Hydrazine alcohol cannot replace copper washing; to avoid using copper washing, alcohol alkylation or alcohol hydroformylation is required. Below are our energy-saving calculations for eliminating copper washing in a capacity of 120,000 tons; please take a look. (To illustrate the energy-saving effects, the heating medium is referred to as steam here.) Once this system is put into use, the existing copper washing unit will no longer be needed. According to the calculations, it is possible to save 95,300 kcal of cooling energy per ton of ammonia produced, as well as 39 kwh of electricity in the cooling system ； By shutting down the copper liquid pump, 9 kW of electricity can be saved per ton of ammonia produced ； Together, the two measures result in 48 kW of electricity savings per ton of ammonia. Based on an annual production of 120,000 tons of synthetic ammonia, this results in an annual energy savings of 5.76 million kwh, equivalent to 2,016 tons of standard coal. After the project was put into operation, the copper washing section was eliminated, so the recycled gas from copper washing is not released outside, resulting in a reduction of 430 m3 of exhaust gas per hour. Its composition is H2: 8.04% ； N22.12% ； CO: 69.1% ； CO2: 8.58% ； NH3: 12.16%. It can reduce the consumption of liquid ammonia by 286 tons per year ； 2.388 million cubic meters of effective gases (H2, N2) for synthetic ammonia production were recovered; these gases are used in the manufacture of synthetic ammonia, enabling the production of 906 tons of liquid ammonia. Together, these two processes result in the recovery of 1,192 tons of ammonia-equivalent from the recycled gas each year. Assuming that 1,400 kilograms of raw coal are required per ton of ammonia produced, this translates to a yearly savings of 1,669 tons of raw coal, or 1,502 tons when expressed in terms of standard coal. Currently, steam is required for heating during the regeneration process in the copper washing section; 630,000 kcal of heat is needed per ton of ammonia, which is equivalent to 90 kilograms of standard coal. After the project is put into operation, the copper washing section will be discontinued, resulting in a savings of 90 kilograms of standard coal per ton of ammonia produced, for a total annual savings of 10,800 tons of standard coal. In total, the project can achieve an annual savings of 14,318 tons of standard coal, resulting in significant energy-saving effects.

1400 kilograms of raw coal per ton of ammonia consumed is far too ideal; under normal circumstances, 1800 kg of coal is required per ton of ammonia