Is it worth producing sulfuric acid?

The process for producing sulfuric acid from hydrogen sulfide is not complicated either; it’s relatively easy to handle as long as the arsenic content is not too high. Setting up such a process is feasible, but it’s necessary to calculate whether the concentration of SO2 produced will be high enough. I think liquid form of SO2 holds more potential than sulfuric acid, depending on which market offers better prospects

It has economic value, but the issue is how to deal with CS2. It seems there is hope for overcoming the difficulties.

Can’t we burn them together? The SO2 concentration is a bit low; heating is needed, and the acid concentration doesn’t increase?

The key is whether CS2 combustion can be broken down into SO2 If it can be broken down into SO2, there is still a profit margin at current sulfuric acid prices.

How much investment is needed roughly? Under 60 million, right? !

Please provide information on the dust and impurity levels in the flue gas, so as to determine the purification setup and investment required. The amount of flue gas is not large; if the composition of the flue gas is simple, the purification setup can be kept simpler. In that case, the flue gas volume at the exit of the drying tower is around 30,000 Nm3/h, so 60 million should be sufficient.

There’s no dust or impurities; I think the investment amount should be much smaller, right? ! I found an investment project, but why is the amount of money involved so small? ! Project construction scale: One set of sulfuric acid production facility capable of producing 120,000 tons per year from pyrite. Total project investment: 7 million yuan

Approach 2: Since the gas is relatively clean, I have an idea: after removing H2S, use adsorption to separate carbon disulfide or nitrogen/oxygen, and then condense and recover carbon disulfide. It’s not clear which side will invest more ； Which side has better benefits? ! Separating air requires an investment of around 40 million; condensing carbon disulfide costs 18 million. Separating carbon disulfide is difficult – adsorbents need to be tested. If it’s possible, the costs associated with condensation can be reduced

I’m fairly familiar with the production of acid from SO2 flue gas in a short time, but I can’t help with the other processes you mentioned.

It’s an environmental project; I hope it can be profitable.

Preliminary calculations show that after conversion to SO2 and removal of moisture from the flue gas, the concentration of the flue gas is around 3.33%, which makes acid production feasible at the current price of sulfuric acid. Currently, there are two process routes; one is the wet method, in which the acid concentration of the product is below 90%. The other method is the dry process, which presents two issues that need to be addressed: 1. The balance of dry absorption; it may be necessary to use two stages of drying, with 75% of the acid being produced, although the goal is primarily to produce 98% acid. 2. For heat balance during conversion, it is recommended to use internal heat exchangers to reduce heat loss, and to equip a heating electric furnace to facilitate operation. A small amount of sulfur can also be mixed in with the flue gas, which will resolve all the aforementioned problems associated with the dry method. This post was last edited by in the blink of an eye on 2008-2-25 13:38.]

The investment required for acid production is definitely less than that for the aforementioned treatment methods.

It appears to be waste gas from a fiber factory; the WSA process can be used to produce acid directly. Nanjing Lenzing is an example.

A waste heat boiler for acid production using 120,000 tons of pyrite; the total investment within the project area is 50 million yuan, excluding land costs and working capital. Last edited by qingzz1965 on 2008-3-12 at 22:42.]