Absorption of methacraldehyde
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This post was last edited by Elegant clouds_Z5QqE on 2021-7-19 at 17:08. Has anyone conducted experiments on the absorption of methacraldehyde? Butanol, when oxidized, produces a mixture of methacraldehyde and inert gases, with the methacraldehyde content ranging from 5 to 10 vol%, while the rest is mainly nitrogen. Currently, high-carbon alkanes (such as dodecane, with a boiling point of around 215°C, and methacraldehyde, with a boiling point of 69°C) are being used for absorption. The temperature of the absorbent is 10°C, the packing consists of 3 mm stainless steel θ rings, the packing height is 120 cm, the tower diameter is 6 cm, and the gas flow rate of the reactant gas is approximately 2.5 L/min; however, the absorption efficiency turns out to be very low. Seeking guidance!
How much high-carbon alkane is used during absorption? What is the solubility of methacraldehyde in high-carbon alkanes?
Are you sure that using dodecane is better than using ethanol? If direct condensation separation is used, it shouldn’t result in the poor absorption effect you mentioned.
Tests have shown that methacraldehyde has good solubility in dodecane, and its high boiling point helps to reduce losses； Ethanol hasn’t been tried, but its boiling point is too low, resulting in significant losses
That’s because the absorption tower is too narrow, resulting in a too high gas linear velocity.
Then I’ll try reducing the gas flow rate, thank you
High-carbon alkanes have good miscibility with methacraldehyde; methacraldehyde can be dissolved at concentrations ranging from single digits to 60–70%. However, it becomes difficult to increase the concentration in the absorption solution beyond 5%, and essentially no further absorption occurs after that point (the absorption solution is circulated in glass absorption columns at a flow rate of about 200 ml per minute, for a total volume of around 1.5 L)