Low pressure methanol carboxylating process to synthesize acetic acid
A technology for oxo and acetic acid, applied in the preparation of carboxylic acid by carbon monoxide reaction, organic chemistry, etc., can solve the problems such as the inability to greatly improve the production capacity and the limited concentration of rhodium complexes
Active Publication Date: 2008-06-11
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology
This method can not increase production capacity more substantially because rhodium complex concentration is limited in the reaction solution
Method used
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Embodiment 1
[0028] Methanol 6%, rhodium 300ppm, methyl iodide 10%, hydrogen iodide 1%, water 5%, morpholine, the molar ratio of morpholine and rhodium is 1:1, and the rest is acetic acid.
Embodiment 2
[0030] Methanol 10%, rhodium 400ppm, methyl iodide 14%, hydrogen iodide 1%, water 8%, formylmorpholine, the molar ratio of formylmorpholine and rhodium is 30:1, and the rest is acetic acid.
Embodiment 3
[0032] Methanol 10%, rhodium 700ppm, methyl iodide 12%, hydrogen iodide 1%, water 7%, acetylmorpholine, lithium iodide, the molar ratio of acetylmorpholine and lithium iodide to rhodium is 70:1, and the rest is acetic acid .
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The low pressure methanol carboxylating process to synthesize acetic acid includes acetic acid synthesis inside reaction liquid in the presence of rhodium-iodine catalyst system, adding morphinone compound, morphinone salt derivative or other additive to stabilize the catalyst system, and separating the coarse product through flash evaporation-evaporation process. The present invention has specific component added to constitute high activity and high stability catalyst system and has greatly raised production capacity of the reactor.
Description
technical field [0001] The invention relates to a method for methanol low-pressure carbonylation of acetic acid, which comprises the step of synthesizing acetic acid in a reaction solution under the presence of a rhodium-iodine catalyst system. Background technique [0002] The methanol low-pressure oxo-synthesis of acetic acid technology developed by Monsanto Corporation of the United States has become the main production method of acetic acid in the world since it was put into production. The process adopts rhodium halide as a catalyst and methyl iodide as a cocatalyst, and realizes carbonylation of methanol and carbon monoxide to acetic acid at 2.8-3.0 MPa and 175-185 DEG C. Due to the active component rhodium complex [Rh(CO) in the reaction system 2 I 2 ] - Instability, so that the method of taking out the crude product based on acetic acid from the reaction solution, the recycle material that is many times that of methanol is selected for flash evaporation. For more...
Claims
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IPC IPC(8): C07C53/08C07C51/12
Inventor 雍永祜胡文励谢经国王晓东曾健廖炯陈群文崔卫东李荣
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND