Removal method of carboxylic acid in aqueous material containing carboxylic acid impurity
A carboxylic acid removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low deacidification efficiency, saturation failure of adsorbents, etc., and achieve good technical effects.
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Embodiment 1
[0027] 1. Catalyst preparation
[0028] 1) Add 0.75 mol MgSO 4 and 0.125 mol Al 2 (SO 4 ) 3 Dissolve in 1 L of water to prepare a uniform mixed salt solution; add dropwise sodium carbonate and sodium hydroxide mixed alkali solution (the concentration of sodium carbonate is 2.5 mol / L, and the concentration of sodium hydroxide is 1.25 mol / L, that is, sodium carbonate and hydrogen The molar ratio of sodium oxide is 2), and the pH value of the control reaction solution is 8.5.
[0029] 2) Aging at room temperature for 6 hours, raising the temperature to 130 °C, keeping it for 24 hours, quenching, filtering, washing with deionized water, and drying at 120 °C overnight to obtain a nano-sized magnesium aluminum hydrotalcite precursor.
[0030] 3) Combine step 2) magnesium aluminum hydrotalcite precursor, 2.5 grams of 30wt% silica sol, 116 grams of 42wt% Mg(Ac) 2 Aqueous solution (i.e. 0.35 mol Mg(Ac) 2 , that is, the ratio of step 1) the number of moles of Mg salt in terms of M...
Embodiment 2
[0039] 1. Catalyst preparation
[0040] According to the catalyst preparation steps in Example 1, a cylindrical (length×diameter: 5 mm×2 mm) magnesium-aluminum composite oxide catalyst was still obtained.
[0041] 2. Catalyst evaluation
[0042] Take 5 grams of the above-mentioned catalyst, and investigate its effect on removing carboxylic acid in the raw material in a fixed-bed continuous microreactor.
[0043] Raw material composition: water 50wt%, p-xylene 50wt%; carboxylic acid content 500 ppmw, wherein carboxylic acid is acetic acid.
[0044] Specific investigation conditions: reaction pressure, 0.5 MPa; reaction temperature, 400 °C; raw material mass space velocity, 2 h -1 .
[0045] The amount of residual carboxylic acid in the reaction product was determined by ion chromatography to be 22.5 ppmw.
[0046] For the convenience of comparison, the catalyst composition, raw material composition, reaction pressure, reaction temperature, raw material mass space velocity, ...
Embodiment 3
[0049] 1. Catalyst preparation
[0050] According to the catalyst preparation steps in Example 1, a cylindrical (length×diameter: 5 mm×2 mm) magnesium-aluminum composite oxide catalyst was still obtained.
[0051] 2. Catalyst evaluation
[0052] Take 5 grams of the above-mentioned catalyst, and investigate its effect on removing carboxylic acid in the raw material in a fixed-bed continuous microreactor.
[0053] Raw material composition: water 50wt%, p-xylene 50wt%; carboxylic acid content 500 ppmw, wherein carboxylic acid is acetic acid.
[0054] Specific investigation conditions: reaction pressure, 0.5 MPa; reaction temperature, 500 °C; raw material mass space velocity, 2 h -1 .
[0055] The amount of residual carboxylic acid in the reaction product was determined by ion chromatography to be 18.8 ppmw.
[0056] For the convenience of comparison, the catalyst composition, raw material composition, reaction pressure, reaction temperature, raw material mass space velocity, ...
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