why is h2so4 added to so3 in contact process?
回答 (1)
2016-02-27 1:48 pm
In contact process, SO₃ is formed. SO₃ can react with water to give H₂SO₄ as shown in the equation below :
SO₃ + H₂O → H₂SO₄
However, the above reaction is very exothermic, and the heat released in the reaction can vaporize the H₂SO₄ formed to become a mist of H₂SO₄. This is dangerous.
To make it safer. 1 mole of 98% H₂SO₄ is used to firstly absorb 1 mole of SO₃ formed to give 1 mole of oleum (H₂S₂O₇), which is then diluted with water to give 2 mole of 98% H₂SO₄. This avoids the formation of a mist of H₂SO₄.
SO₃ + H₂O → H₂SO₄
However, the above reaction is very exothermic, and the heat released in the reaction can vaporize the H₂SO₄ formed to become a mist of H₂SO₄. This is dangerous.
To make it safer. 1 mole of 98% H₂SO₄ is used to firstly absorb 1 mole of SO₃ formed to give 1 mole of oleum (H₂S₂O₇), which is then diluted with water to give 2 mole of 98% H₂SO₄. This avoids the formation of a mist of H₂SO₄.
收錄日期: 2021-04-18 14:38:02
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