Carbonylation reactor for producing acetic acid, and application method

Abstract

The invention relates to a carbonylation reactor for producing acetic acid and an application method thereof. The carbonylation reactor is composed of a fully mixed-flow reaction zone tank reactor and a tower reactor. By adjusting the temperature of the tower section of the reactor and controlling the temperature on the inlet plate of the reaction liquid in the tower section to adjust the temperature of the reaction liquid at the outlet of the tower section of the reactor, the reactor is in the best working state. In the device for preparing acetic acid using this method, the carbonylation reactor is connected to the flash separator, and is connected to the catalyst cooler and the carbonylation reactor respectively through the catalyst pump; the catalyst cooler is respectively connected to the cooling port of the carbonylation reactor ; The other outlet of the separator is connected with the cold shock port of the lower part of the carbonylation reactor. The present invention overcomes the shortcoming of the simple plug-flow reactor, because in the upper tower reactor, the cooling shock effect changes the temperature gradient distribution, but does not change the concentration gradient of CO in the tower reactor, so the CO concentration is from the bottom to the top Decrease gradually, so that the concentration of CO in the vented tail gas is reduced, and the conversion rate of CO is improved.

Description

technical field [0001] The invention relates to a carbonylation reactor for producing acetic acid and its application method, in particular to a reactor for producing acetic acid by carbonylation of methanol and carbon monoxide, and a method for using the reactor. Background technique [0002] In the 1970s, Pricker proposed a carbonylation method with carbon monoxide and methanol in US Patent No. 3,769,329. Use rhodium catalyst to add methyl iodide, methyl acetate, water and use acetic acid as a solvent to form a reaction solution. Carbon monoxide and methanol are carbonylated in the reaction solution to generate acetic acid. The crude acetic acid of component obtains pure product acetic acid by using the method of rectification well known in the chemical industry. This method was eventually industrialized worldwide. In the 1980s, Celanese Brad L. Smith and others improved the Pricker method. Propose in patent CN85101460, add inorganic iodine...

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Problems solved by technology

But this kind of reactor also has its disadvantages. According to the chemical reaction engineering theory, back-mixing in the reactor will lead to a decrease in the conversion rate of reactants

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