Oxidation method for tert-butyl alcohol

Abstract

The invention provides an oxidation method for tert-butyl alcohol. The method comprises the step of subjecting a liquid mixture containing cyclohexane and an oxidant to passing through catalyst beds under the condition of oxidation reaction, wherein the catalyst beds comprise a first catalyst bed and a second catalyst bed; on the basis of the flow direction of the liquid mixture, the first catalyst bed is located at the upper stream of the second catalyst bed; a titanium-silicon molecular sieve filled in the first catalyst bed is a hollow titanium-silicon molecular sieve; and the titanium-silicon molecular sieve filled in the second catalyst bed is the titanium-silicon molecular sieve different from the hollow titanium-silicon molecular sieve. The method provided by the invention can effectively prolong the single-way service life of the titanium-silicon molecular sieve used as a catalyst, reduce regeneration frequency of the catalyst, improve production efficiency, and enhance operation stability and prolong the total service life of the catalyst at the same time.

Description

technical field [0001] The invention relates to a method for oxidizing tert-butanol. Background technique [0002] Tert-butyl hydroperoxide is a colorless transparent or yellow liquid, which is miscible with organic solvents such as ethanol and ether. It is stable below 75°C, loses oxygen at 90-100°C, and explodes at 250°C. Tert-butyl hydroperoxide is mainly used as a catalyst for polymerization reactions, and as an introduction agent for peroxide groups in substituent reactions. It is used for dyeing and printing cotton, viscose, silk, nylon and other fibers and their fabrics. Used for polyester / viscose blended fabric dyeing. [0003] Tert-butyl hydroperoxide can also be used as a drying agent for unsaturated melamine resin coatings, a polymerization initiator, and an intermediate in organic synthesis. The existing preparation methods mainly include: first, after diazotization of p-nitroaniline o-sulfonic acid, coupling with gamma acid, then reducing the nitro group in t...

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Problems solved by technology

[0004] A kind of method of preparing tert-butyl hydroperoxide is disclosed in CN1699339A, this method is simply with titanium silicon molecular sieve as catalyst, with hydrogen peroxide as oxidant, tert-butanol conversion rate still has bigger room for improvement

[0005] When titanium-silicon molecular sieves are used as catalysts to oxidize tert-butanol, the common problem is that with the prolongation of the reaction time, the catalytic activity of titanium-silicon molecular sieves will show a downward trend, resulting in the conversion rate of oxidant, the effective utilization rate of oxidant and the selectivity of target oxidation products. reduce

[0007] However, when the regenerated catalyst is put into operation again, especially after being regenerated in the device, the activity and selectivity of the catalyst fluctuate greatly, and it takes a long time to stabilize; at the same time, it is necessary to combine operations such as increasing the reaction temperature To achieve the smooth operation of the reaction, but this will further accelerate the deactivation of the catalyst and reduce the selectivity of the target oxidation product, which will affect the refining and separation of subsequent products, and is also not conducive to safe production

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