Method for processing cyclohexane oxidation liquid

Abstract

The invention relates to the field of the fine chemical industry, in particular to a method for processing a cyclohexane oxidation solution. The method comprises the step that the cyclohexane oxidation solution makes contact with a catalyst, wherein the catalyst contains a silicon-containing molecular sieve, and the cyclohexane oxidation solution contains cyclohexyl hydroperoxide. A preparation method of the silicon-containing molecular sieve comprises the steps that 1, a silicon source, a group VIII metal source and a structure guide agent are hydrolyzed to obtain a hydrolyzed material; 2, the hydrolyzed material is crystallized, wherein the group VIII metal source is an iron source or a mixture of the iron source and a cobalt source, and step 1 is conducted in the presence of an organophosphorus compound and / or before step 2, crystallization is conducted after the hydrolyzed material and the organophosphorus compound are mixed. The silicon-containing molecular sieve is used for processing the cyclohexane oxidation solution, extra alkaline reagents do not need to be added, the effects of a high alcohol-ketone ratio and high alcohol-ketone selectivity can be obtained at low temperature, and the method is high in industrial application value.

Description

technical field [0001] The invention relates to a method for processing cyclohexane oxidation liquid. Background technique [0002] Cyclohexanone is an important basic chemical raw material, which has been used in the production of important chemical products such as caprolactam, adipic acid and ε-caprolactone. According to statistics, by the end of 2015, the production capacity of cyclohexanone in my country had reached 3.65 million tons. In my country, cyclohexanone is mainly produced through cyclohexane oxidation and cyclohexene hydration processes, and the production capacity of cyclohexane oxidation accounts for as high as 63%. [0003] The existing cyclohexane oxidation process mainly includes three processes: cyclohexane oxidation, cyclohexyl hydroperoxide decomposition and cyclohexanol dehydrogenation. Although the cyclohexanol dehydrogenation process is relatively mature and stable, there are many side reactions in the cyclohexane oxidation process, and the conver...

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Problems solved by technology

[0006] Although the above, the interaction between metal oxide and carrier is weak, the stability of the supported catalytic material needs to be improved; in the supported catalyst, the content of metal oxide is high (>1% mass fraction), which is difficult to ensure the active component can be evenly distributed; the pore size of the AFI and MFI structures is not greater than 0.55nm, while the molecular size of cyclohexyl hydroperoxide is about 0.74nm, the Cr active center in the two molecular sieves is difficult to interact with CHHP, and the active center of the heteroatom molecular sieve The effective utilization rate is low; although the mesoporous TUD has a large pore structure, its pore wall is an amorphous species, and its hydrothermal stability is not ideal

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