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Continuous process for preparing methacrolein

A technology of methacrolein and propionaldehyde, which is applied to the preparation of ketene, carbon-based compounds, chemical instruments and methods, etc., and can solve the problems of the complication of the continuous method of methacrolein, production time and yield loss, etc.

Pending Publication Date: 2021-04-09
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly complicates the continuous process for the preparation of methacrolein and also leads to loss of production time and yield

Method used

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  • Continuous process for preparing methacrolein
  • Continuous process for preparing methacrolein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Column K350 as depicted in Figure A is used for the distillation of crude methacrolein. It is equipped with a 5.3m Rombopack 12M with a diameter of 100mm. Feed is directed to the top of the distillation column. The condenser WT351 was operated with cooling water (500 l / h), and the subsequent offgas condenser WT354 was operated with 2°C brine. The column was operated at ambient pressure. The combined distillates were cooled with 2°C brine in cooler WT353 and sent to horizontal phase separator B351. B351 has a separation length of 60 cm with 2 x 16 cm Sulzer CY packing elements. The upper phase overflowed to MAL storage vessel B353. Using P351 with a maximum flow rate of 9 liters / minute, the lower phase was pumped back to the column as reflux and the interface level of B351 was controlled. Use P352 to pump the bottom of K350 to an area of ​​0.12m at 1500 liters / hour 2 In the falling film reboiler, the reboiler was operated with 11 bar gauge (barg) steam and the stea...

Embodiment 2

[0074] Column K1 as depicted in Figure B is used for the distillation of crude methacrolein. It is equipped with 0.7m SulzerEX packing with a diameter of 50mm. Feed is directed to the top of the distillation column. The condenser WT5 was operated with cooling water, and the subsequent off-gas condenser WT6 was operated with 2°C brine. The column was operated at ambient pressure. The combined distillates are sent to horizontal phase separator B4. The upper phase of the phase separator is pumped to MAL storage vessel B5, which controls the total liquid level in the phase separator. The lower phase is pumped back to the column as reflux and the interface level of B4 is controlled. Heat was supplied to the column using an electric heater with a maximum load of 300W, and the column temperature TIRC7 (located at 20 cm from the packing measured from the top of the column) was controlled around 75°C. The bottom draw of K1 is pumped to storage vessel B7, which controls the liquid ...

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Abstract

The present invention relates to a continuous process for preparing methacrolein by a Mannich condensation reaction of formaldehyde with propanal, in which a methacrolein polymerisation inhibitor is introduced during the production process and a part thereof is recycled back into the reactor where the Mannich condensation reaction is carried out.

Description

technical field [0001] The present invention relates to methacrolein, and more particularly to a continuous production process for the preparation of methacrolein by reacting formaldehyde with propionaldehyde. Background technique [0002] Methacrolein, or methacrolein, is an unsaturated aldehyde. Industrially, methacrolein is a compound valuable as a starting material in the chemical industry and especially in the manufacture of polymers and synthetic resins. [0003] Numerous methods for the preparation of methacrolein are known to those skilled in the art and are the subject of relevant review articles, for example in the open publication Ullmann's Encyclopedia of Industrial Chemistry 2012 (Ullmann's Encyclopedia of Industrial Chemistry 2012), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Acrolein and Methacrolein (Acrolein and Methacrolein), DOI: 10.1002 / 14356007.a01_149.pub2. [0004] In particular, methacrolein can be prepared by reacting formaldehyde with propionaldeh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/75C07C45/87C07C47/22
CPCC07C45/75C07C45/87C07C47/22C07C45/82C07C45/86C09K15/04C09K15/08
Inventor A·莱金S·科里尔M·格伦彭T·巴尔杜弗R·波格哈德特
Owner ROHM G M B H
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