Heteropoly acid catalyzed process to eliminate micro aldehyde group from 1,3-propylene glycol
A technology for heteropolyacid and propylene glycol is applied in the field of catalytic removal of trace aldehyde groups in 1,3-propanediol by heteropolyacid, which can solve the problems of difficult regeneration, high resin cost, poor effect, etc., and achieves low aldehyde content and low cost. , good dealdehyde effect
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Embodiment 1
[0013] Put 250g of concentrated solution containing 1,3-propanediol and 5g of phosphotungstic acid (HPW) (Keggin structure) in a 500ml three-neck flask equipped with a magnetic stirrer, and immerse the flask in a hot water bath, at 40 ° C, stirring Under the condition of reaction 1h. The solution after dealdehydeization was rectified under reduced pressure. The number of theoretical plates in the rectification tower was 28, the temperature of the bottom of the tower was 147°C, the reflux ratio was 10:1, and the operating pressure was 2kPa. The content of 1,3-propanediol in the overhead distillate product exceeds 99.6%. The results are shown in Table 1.
Embodiment 2
[0015] The dealdehyde reaction and rectification operating conditions are the same as in Example 1, and the catalyst is changed to phosphomolybdic acid. The results are shown in Table 1.
Embodiment 3
[0017] The dealdehyde reaction and rectification operating conditions are the same as in Example 1, and the catalyst is changed to silicotungstic acid. The results are shown in Table 1.
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