Sodium citrate absorbs sulfur dioxide

It was reported in \"Sulfuric Acid Industry\"; you can check it out. The disadvantage of the sodium citrate method for absorbing SO2 is that it is not suitable for treating SO2 flue gas with high SO3 contents; the same is true for organic amines as used by Tang Shifu.

Due to the high SO3 content in SO2, more sodium citrate is required for consumption, which results in an increased amount of Na2SO4 as a by-product; therefore, the 10kt/a sodium citrate-based liquid SO2 plant in Suzhou is equipped with an SO3 absorption tower and an electrostatic precipitator.

On the 2nd floor, what is the absorption rate of sulfur dioxide under conditions using sodium citrate?

It seems like something is missing. Is it that tall?

Yes, I got only 94–96% on it.

In the citric acid-sodium citrate solution (lean solution), the total amount of citric acid is 200–220 g/l, the concentration of free citric acid is less than 25 g/l, the temperature is below 40 degrees, and the SO2 absorption rate can exceed 98%.

Is Master Yan conducting a trial run? Is it still the Environmental Protection Agency that needs to collect the data on emissions?

It is necessary to install an absorption tower, which integrates gas purification, cooling, SO3 absorption, and demisting – representing an excellent process approach； But electrostatic foggers were invented in the 1980s; by the 1990s they were replaced by Monsanto’s fog eliminators, which had an efficiency that was an order of magnitude lower.

Is technology transfer possible? However, it might be quite difficult at temperatures below 40 degrees.

As long as there is sincerity, the transfer of downstream sulfuric acid products is not a problem!

It is about the technology for 98% sulfur dioxide absorption rate.

Haha, it really exists. Sodium carbonate is added after the exhaust gases to serve as an absorption agent in a scrubber tower; the resulting sodium hydroxide solution is sold abroad, and demand for it is quite good. The absorption efficiency for SO2 is almost 100%. What do you think? :lol

Is that called absorption rate? :L I think it should be called exhaust treatment rather. Do you still want to transfer such technology? Anyway, I don’t want it; there are plenty of them available on the market.

Is the consumption of citric acid-sodium citrate solution to absorb SO2 high?

Citric acid: 6 kg/t; Sodium carbonate: 15 kg/t; Steam: 2.5 t/t; Electricity: 150 kw.h/t

There are those who claim to have a great deal of expertise in SO2 technology – would you believe them? :lol

The last edit to this post was made by That makes sense on 2014-4-26 at 17:50. Those who work in the field of fine chemicals know that inorganic chemistry involves little in terms of technical complexity; the process of producing liquid SO2 using sodium citrate is simply a physical process of absorption and desorption.

It seems that there have already been experimental devices for this technology

1. The sodium citrate method for producing liquid SO2 involves high investment costs. The 10kt/a sodium citrate-based liquid SO2 plant in Suzhou uses SO2 gas from the exhaust of a waste heat boiler; this gas is cooled in a economizer, and then it passes through an absorption tower where it is purified, cooled, and the SO3 is absorbed. Mist removal is carried out using a mist eliminator manufactured by Monsanto, and further mist removal is achieved with an electric mist eliminator. The SO2 gas is absorbed by a sodium citrate solution (lean solution), and the sodium citrate solution enriched with SO2 is heated with steam to release the SO2 gas again. After that, the gas is dried, compressed, and cooled to produce liquid SO2. 2 I believe that the sulfur-pure oxygen method is the best approach for producing liquid SO2, with oxygen being obtained through pressure swing adsorption using molecular sieves.