Method for producing methyl isopropyl ketone

Abstract

The invention relates to a process for producing methyl isopropylacetone, which uses H3PO4-B / bergmeal as catalyst, converts isoprene and water in a thermal-insulation reactor into methyl isopropylacetone. The process comprises that gasified water and isoprene are preheated, to be fed into a catalyst bed via the top of the reactor to react, wherein the phosphate content of the catalyst is 50-80% of catalyst mass, while the boron content is 4-9%. When the reaction temperature is 180-300DEG C, the mol ratio between water and isoprene is 4.0-8.0, air-speed LHSV is 0.1-0.5h-1, and the reaction pressure is normal pressure as 0.3MPa, isoprene and water via addition and isomerization generate methyl isopropylacetone. Compared with prior H3PO4 bergmeal catalyst, the invention uses H3PO4-B bergmeal catalyst to improve catalyst stability and effectively overcome the defects of H3PO4-B bergmeal catalyst as intrinsic easy phosphate loss and catalyst pelitization, to prolong the service life of catalyst, thereby reducing the catalyst application cost and production cost of methyl isopropylacetone.

Description

technical field [0001] The present invention relates to a kind of method that takes isoprene as raw material to prepare methyl isopropyl ketone, particularly relate to making isoprene and water, in H 3 PO 4 A method for producing methyl isopropyl ketone through hydration and isomerization of isoprene under the action of B / diatomite acidic catalyst. Background technique [0002] Methyl isopropyl ketone (MIPK hereinafter referred to as MIPK) is a colorless, transparent, fine chemical intermediate and high-grade solvent with an aromatic smell. Fragrance intermediates. The synthesis of MIPK can adopt a variety of routes, but the processes with industrial significance mainly include the decarboxylation process of isobutyric acid and acetic acid as raw materials, the condensation isomerization process of methyl ethyl ketone and the direct hydration isomerization process of isoprene. . The decarboxylation process has high raw material consumption, complex production process, an...

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Problems solved by technology

[0008] In the above technical scheme, although the methyl isopropyl ketone product can be produced, due to H 3 PO 4 / The inherent phosphoric acid loss of diatomite catalyst and the defect that the catalyst is easy to muddy make the catalyst unable to be used for a long period of time, and the catalyst needs to be replaced frequently

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