Technology of preparing sulfuric acid by lean oxygen method
A technology for producing sulfuric acid and depleting oxygen, applied in the fields of sulfur compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as the inability of exhaust gas to meet the requirements of environmental standards, difficulties in disposal of waste sulfuric acid, etc., and shorten the production process and consumption of sulfuric acid. The effect of reducing and reducing production costs
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Embodiment 1
[0043] Example 1: Different SOs 2 with O 2 Influence of molar ratio on treatment effect
[0044] in SO 2 with O 2 The reaction converts to SO 3 process, the conventional practice is to use O 2 excess, and this application is based on SO 2 The processing of sulfuric acid is carried out in an excess manner, and the following experiments are carried out with different molar ratios to determine different SO 2 with O 2 Influence of molar ratio on treatment effect.
[0045] Taking the scheme of lye absorption as an example, the preparation process of the present embodiment is as follows:
[0046] (1) The purified feed gas is sent to the converter to control SO in the feed gas 2 with O 2 The molar ratio of the , 1: 0.45, 1: 0.43, 1: 0.4, 1: 0.3, 1: 0.2 seven points for the experiment) three intervals to carry out the experiment, the raw material gas flow through the high temperature catalyst bed, the control conversion temperature is 420 ℃, the SO 2 Convert to SO 3 , and...
Embodiment 2
[0054] Example 2: Ionic liquid absorption
[0055] In this embodiment, a process for producing sulfuric acid by an oxygen-lean method uses pyrite for acid production as a raw material, that is, the raw material gas is pyrite roasting gas. The raw material gas is sent to the converter after purification treatment (through SO in the raw material gas in each step) 2 with O 2 The ratio of the amount of the total substance is 1:0.5). Under the catalysis of vanadium-based catalysts, the SO in the feed gas is 2 After multi-stage conversion, and the outlet temperature of the last stage is 420 ℃ to convert into SO 3 (SO 2 The conversion was 95.3%, and the oxygen conversion was 95.3%). The reformed gas discharged from the reformer enters the sulfuric acid absorption tower to make the SO in the reformed gas 3 It reacts with water to generate the product sulfuric acid, and the remaining tail gas is discharged separately.
[0056] SO in exhaust 2 The content is 12000mg / Nm 3 , the ...
Embodiment 3-5
[0060] Examples 3-5: Ionic liquid absorption
[0061] The setting and working principle of Example 3-5 are the same as Example 1, and the composition of the ionic liquid is adjusted to form Example 3-5; the concentration of exhaust gas and the content of sulfate are compared, and based on different reference patents, comparative examples are formed respectively. 2-4, the experimental results are shown in Table 1.
[0062] Table 1 Comparison table of effects under different ionic liquid compositions
[0063]
[0064] In the above table, % is mass percentage.
[0065] It can be seen from Examples 2-5 that the preparation process of the present application can not only shorten the production process of sulfuric acid, but also the one-turn-one-suction process can be preferentially selected for its process, so as to reduce the production cost of sulfuric acid and improve the utilization rate of energy and resources; at the same time, The proportion of materials entering the co...
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