Method for treating aqueous solution of 3-hydroxypropanal mixture containing carboxylic acid and metal cation and application thereof
A metal cation and hydroxypropionaldehyde technology, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, the separation/purification of carbonyl compounds, etc., can solve the problems of uneven pH distribution of aqueous solutions, affecting product distillation, and insufficient stirring. Achieve the effects of reducing impact, improving recovery rate and extending life
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Embodiment 1～ Embodiment 13
[0042] 1) Contact the aqueous solution of 3-hydroxypropanal mixture obtained by hydroformylation reaction of ethylene oxide with an acidic medium (placed in fixed bed reactor C-1) to obtain the first aqueous solution containing 3-hydroxypropanal mixture ;
[0043] 2) contacting the first aqueous solution containing 3-hydroxypropanal with an alkaline medium (placed in fixed bed reactor C-2) to obtain a second aqueous solution containing 3-hydroxypropanal;
[0044] 3) Hydrogenate the second aqueous solution containing 3-hydroxypropionaldehyde mixture in two stages, hydrogenation process conditions: first stage reaction temperature: 55°C; second stage reaction temperature: 120°C; liquid hourly space velocity: 0.8h -1 ; Hydrogen-aldehyde ratio: 30; 3-hydroxypropanal concentration: 18wt%; Hydrogenation catalyst: nickel-based catalyst.
[0045] Step 1) and Step 2) at 0.1MPa, 25°C, 2h -1 In the case of , the pretreatment was carried out and different types of media were used. The r...
Embodiment 14
[0055]1) The aqueous solution of the 3-hydroxypropionaldehyde mixture obtained through the hydroformylation reaction of ethylene oxide is contacted with the acidic medium D113 (placed in the fixed bed reactor C-1) to obtain the first mixture containing 3-hydroxypropionaldehyde Aqueous solution; the cobalt ion in the 3-hydroxypropanal mixture aqueous solution obtained by the hydroformylation reaction of the ethylene oxide is 1.58mmol / L, the pH is 3.9, and the 3-HPA concentration is 20wt%;
[0056] 2) contacting the first aqueous solution containing 3-hydroxypropanal with alkaline medium D301 (placed in fixed bed reactor C-2) to obtain a second aqueous solution containing 3-hydroxypropanal;
[0057] Step 1) and Step 2) at 0.1MPa, 30°C, 2.5h -1 , pre-processing;
[0058] After the pretreatment of step 1) and step 2), the recovery rate of 3-hydroxypropionaldehyde is 99.89%, the cobalt ion is 0.018mmol / L, and the pH is 5.1;
[0059] 3) Hydrogenate the second aqueous solution cont...
Embodiment 15
[0061] 1) The aqueous solution of the 3-hydroxypropionaldehyde mixture obtained through the hydroformylation reaction of ethylene oxide is contacted with the acidic medium D113 (placed in the fixed bed reactor C-1) to obtain the first mixture containing 3-hydroxypropionaldehyde Aqueous solution; the cobalt ion in the 3-hydroxypropanal mixture aqueous solution obtained by the hydroformylation reaction of the ethylene oxide is 1.58mmol / L, the pH is 3.9, and the 3-HPA concentration is 20wt%;
[0062] 2) contacting the first aqueous solution containing 3-hydroxypropanal with alkaline medium D301 (placed in fixed bed reactor C-2) to obtain a second aqueous solution containing 3-hydroxypropanal;
[0063] Step 1) and Step 2) at 0.1MPa, 30°C, 6h -1 In the case of , carry out pre-processing;
[0064] After the pretreatment of step 1) and step 2), the recovery rate of 3-hydroxypropionaldehyde is 99.83%, the cobalt ion is 0.78mmol / L, and the pH is 5.1;
[0065] 3) Hydrogenate the secon...
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