Method for producing (methyl) acrylic acid
A technology of acrylic acid and methyl group, applied in the direction of oxidative preparation of carboxylic acid, organic chemistry, etc., can solve the problems such as difficulty in maintaining the operating temperature of the tower kettle, restricting the processing capacity of the whole tower, reducing the flux in the stripping section, etc. throughput, the effect of increasing the processing power
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Embodiment 1
[0028] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, and the stripping section adopts vertical sieve plates. And holes are opened on the upper part of the vertical sieve plate mass transfer unit to further reduce the pressure drop of the device. The vertical sieve plate in this embodiment can prevent a small amount of acrylic acid polymer that may be produced in the stripping section from clogging the tray, and it is also easy to remove if a small amount of polymer is generated. The height of the overflow weir is 10 mm.
[0029] The acrylic acid aqueous solution containing 45% (mass) acrylic acid, 2% (mass) acetic acid and a small amount of formic acid and formaldehyde is continuously entered into the acrylic acid aq...
Embodiment 2
[0031] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, and the stripping section adopts guided valve trays. At the same time, in order to enhance the gas-liquid mass transfer effect, the height of the overflow weir on the guide valve tray is 10mm. The guide valve tray in this embodiment can prevent a small amount of acrylic acid polymer that may be generated in the stripping section from clogging the tray, and it is also easy to remove if a small amount of polymer is generated.
[0032] The acrylic acid aqueous solution containing 45% (mass) acrylic acid, 2% (mass) acetic acid and a small amount of formic acid and formaldehyde is continuously entered into the acrylic acid aqueous rectification tower, and the tower is f...
Embodiment 3
[0034] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the upper part of the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, the lower part of the rectification section adopts co-current injection packed trays, and the stripping section adopts vertical sieve trays. And holes are opened on the upper part of the vertical sieve plate mass transfer unit to further reduce the pressure drop of the device. At the same time, in order to enhance the effect of gas-liquid mass transfer, the height of the overflow weir is increased to 15mm. The co-current injection packed trays of this embodiment can prevent the small amount of acrylic acid polymers that may be produced in the rectification section from clogging the trays, and if a small amount of polymers are generated, it is also...
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