Recovery process of dilute sulfuric acid in industrial wastewater
A technology for industrial wastewater and dilute sulfuric acid, applied in sulfur trioxide/sulfuric acid, sulfur compounds, inorganic chemistry, etc., can solve the problems of insufficient recycling and reuse of by-products, the precipitation rate of dilute sulfuric acid needs to be improved, and the equipment is corrosive. , to achieve the effect of difficult equipment, high safety and avoiding side effects
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[0032] Examples:
[0033] Such as figure 1 As shown, the recovery of dilute sulfuric acid in industrial wastewater is carried out according to the following steps:
[0034] Step 1: Take 1.0L of industrial wastewater with dilute sulfuric acid, in which the mass content of sulfuric acid is about 1.0%, and then add 0.4L of toluene extract containing polyamino compounds. The weight content of polyamino compounds is 10.0%. After stirring and standing for 0.5 to 2.0 hours, the toluene extract is separated;
[0035] Equation 1 below, using -NH 2 Stronger dissolving ability: Dissolve sulfuric acid molecules into the toluene extract containing polyamino compounds, after extraction and separation:
[0036]
[0037] Equation 1 The reaction mechanism of sulfuric acid and polyamino compounds
[0038] Step 2: Add aldehyde-based compounds and deionized water to the separated toluene extract, add 20.0 g of aldehyde-based compounds per liter of the separated toluene extract, and add 20.0 grams of alde...
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