Economic efficiency of producing ammonium bisulfite from sulfuric acid tail gas

It will definitely cost you money, but it will be good for the environment.

If you use the sulfur dioxide in the exhaust gas to produce it, I think it is feasible and profitable, because you also need to process the exhaust gas yourself.

I have argued it myself: From an economic point of view, it is a small profit or basically guaranteed capital. From an environmental point of view,: It has huge environmental and social benefits! 12.1.1 Unit production cost budget of liquid sulfurous acid an 1. Data basis for evaluation 1. Product scale: 5500t/a (liquid 38% concentration), 2500t/a (solid 85%). 2. Product value: 447 yuan/t (liquid 38% concentration), 980.00 yuan/t (solid 85%). 3. Raw material prices: Yuan/t Liquid ammonia 2,450 Yuan/t 4. Total capacity: 6 people (Liya) + 1 person (Guya) = 7 people 2. Product cost: 1) Cost calculation of liquid sulfurous acid an 1. Liquid ammonia: 0.100 tons/ton × 2450.00 yuan/ton = 245.00 (liquid subconcentration 38~40%) 2. Power consumption: 60 degrees/ton×0.50 yuan/degree=30.00 3. Labor wages: 20.00 4. Water: (1.4~2 tons/ton) 1.7×0.5=0.85 yuan/ton 5. Depreciation fee: 36.00 yuan/ton 6. Maintenance fee: 10.00 yuan/ton 7. Workshop management fee: 10.00 yuan/ton 8. The company’s sales and management expenses: 20.00 yuan/ton for 1 to 8 items in total: 371.85 yuan/ton. 2) Cost calculation of solid sulfite an 9. Liquid ammonia: 0.257 tons/ton × 2450.00 yuan/ton = 629.65 (Guya (NH4)2SO3·H2O concentration ≥85%) 10. Power consumption: 200 degrees/ton×0.50 yuan/degree=100.00 11. Labor wages: 50.00 12. Water: (1~2 tons/ton) 2×0.5=1.00 13. Packaging fee: 20×1.20=24.00 yuan/ton 14. Depreciation fee: 80.00 yuan/ton 15. Maintenance fee: 12.00 yuan/ton 16. Workshop management fee: 10.00 yuan/ton 17. The company’s sales and management expenses: 20.00 yuan/ton for 9 to 17 items in total: 926.65 yuan/ton. 12.2 Economic Benefit Analysis 1. Economic Benefit Analysis of the Whole-Production Guya: (980-926.65) yuan/ton × 2500 tons/year = 133,380 yuan/year ； Deduct 17% VAT: 22,670 yuan ； net profit: 110,700 yuan/year. 2. Economic benefit analysis of full liquid production: (447-371.85) yuan/ton × 5500 tons/year = 413,300 yuan/year ； Deduct 17% VAT: 70,261 yuan, net profit: 343,040 yuan/year. 12.2.1 Price Forecast of Industrial Grade Sulfite An: 1: The sales price of liquid ammonium nitrate is 447 yuan/t (liquid 38% concentration), 2: The sales price of solid ammonium nitrate is 980.00 yuan/t (solid 85%). 12.2.2 Economic benefits Net investment payback period (liquid immonium) = 70.9/34.304=2.07 years (2 years and 1 month) Net investment payback period (solid immonium) = 92.52/11.07=8.36 years (8 years and 5 months) (one-step investment) ； It’s best to invest in two steps: It is more economical to wait for the investment in the production of liquid anhydrous sulfite to be recovered before investing in solid ammonium sulfite. Otherwise, the investment recovery period is too long and it is not economical at all. However, environmental protection requirements require investment, and even if there is a loss, investment must be made to manage and protect the environment.

In fact, the most economical thing is to increase the conversion rate. Invest hundreds of thousands of dollars to buy a better catalyst to increase the conversion rate from 99.5% to 99.8%. There will be no problem with tail gas emissions. If you can produce 1,000 tons more acid, the investment will be repaid in half a year. How much equipment and operating costs are saved.

With the current price of sulfuric acid, it may be difficult to make a profit!