Method for manufacturing high purity sulfuric acid

Method for manufacturing high purity sulfuric acid

  • CN 104,129,762 A
  • Filed: 04/25/2014
  • Published: 11/05/2014
  • Est. Priority Date: 05/01/2013
  • Status: Active Application
First Claim
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1. a preparation method for high-purity sulfuric acid solution, at least comprises:

  • One mixing solutions is provided, and wherein said mixing solutions comprises sulfuric acid, the first solution, hydrogen peroxide, water, oxygen and insoluble impurity, and the boiling point of described the first solution is higher than the boiling point of sulfuric acid;

    Utilize run by gravity under a normal atmosphere, sequentially to carry out the first pre-heating step, the second pre-heating step and distilation steps described mixing solutions, to form the second solution, wherein the first pre-heating step is removed hydrogen peroxide, water and oxygen, the second pre-heating step and distilation steps are removed water, the temperature of the first pre-heating step is the temperature lower than the second pre-heating step, and the temperature of the second pre-heating step is the temperature lower than distilation steps;

    Described the second solution is carried out to evaporation step, at the boiling point in higher than sulfuric acid and the temperature lower than the boiling point of described the first solution, remove insoluble impurity and the first solution, and obtain the first gas, wherein said the first gas comprises sulphur trioxide, sulfuric acid and water;

    AndUtilize sulphuric acid soln to absorb described the first gas, to form a high-purity sulfuric acid solution, the concentration of wherein said sulphuric acid soln is to be greater than 96 weight percents, and the concentration of described high-purity sulfuric acid solution is at least 96 weight percents, and the impurity of described high-purity sulfuric acid solution is to be not more than 0.1ppb.

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