Method for synthesizing 2, 6-di-tert-butylphenol by using environment-friendly heterogeneous catalyst

Abstract

The embodiment of the invention discloses a method for synthesizing 2, 6-di-tert-butylphenol by using an environment-friendly heterogeneous catalyst in the technical field of chemical synthesis, whichcomprises the following steps: S1, introducing a reaction raw material tert-butyl alcohol from a feed port at the top end of a reactor I through a feed pump, adding a solid acid catalyst into the reactor I, and carrying out dehydration reaction to generate an isobutene solution; s2, conveying the reaction liquid into a cooler from a discharge port in the top end of the reactor for cooling, and conveying the obtained cooling liquid into a primary rectifying tower for rectification; the preparation process is simple, the reaction pressure is stable, a heterogeneous catalyst reaction system is introduced, a novel heterogeneous catalyst is used for replacing an L acid or aluminum salt homogeneous catalyst in an original production process, According to the characteristics of the novel heterogeneous catalyst, a 2, 6-di-tert-butylphenol synthesis reaction unit and a separation unit are subjected to process optimization design, so that the yield of 2, 6-di-tert-butylphenol is improved. The purposes of simplifying the process, saving energy and protecting the environment are achieved, economic benefits are improved, and the requirement for large-scale industrial green production is met.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of chemical synthesis, in particular to a method for synthesizing 2,6-di-tert-butylphenol with an environment-friendly heterogeneous catalyst. Background technique [0002] 2,6-Di-tert-butylphenol, English name 2DTBP, molecular formula C14H22O, soluble in caustic lye and common organic solvents such as ethanol. 2,6-Di-tert-butylphenol is used to prepare hindered phenolic antioxidants, rubber anti-aging agents, cresol-formaldehyde resins and plasticizers. It can be used as a disinfectant in medicine and also used as a surfactant to manufacture many An excellent antioxidant and light stabilizer, it can also be used in the manufacture of natural rubber and synthetic plastic antioxidants, fuel stabilizers, ultraviolet absorbers, pesticides, dye intermediates, etc. [0003] Existing 2,6-di-tert-butylphenol is widely used in industry, and there are many kinds of preparation technology re...

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Problems solved by technology

[0003] Existing 2,6-di-tert-butylphenol is widely used in industry, and there are many kinds of preparation technology research about 2,6-di-tert-butylphenol, as patent CN1935764A discloses a kind of 2,6-di-tert-butylphenol The preparation method of butylphenol alkylation liquid uses aluminum powder as a catalyst to catalyze the reaction of phenol and isobutylene. The conversion rate of phenol in this method is above 85%, and the product yield can reach 80%. However, the reaction system is a high-pressure reaction, and the reaction In the process, the pressure is unstable, the process operation difficulty coefficient is relatively large, and the reaction waste liquid treatment is difficult, and the environmental protection cost is high; the patent CN 108503513A discloses a preparation method of 2,6-di-tert-butylphenol, which uses triisobutylaluminum With aluminum trichloride as a catalyst, it catalyzes the reaction of phenol with isobutylene or isobutylamine, and the final product yield can reach 98.5%.

The preparation method has mild reaction conditions, high product yield, and low possibility of forming by-products, but the reaction needs to undergo multi-step temperature rise and fall, the process is cumbersome, the operation is complicated, and waste water containing metal ions is generated at the same time, which has a greater pollution effect on the environment; Patent CN 102906059B discloses a method for producing 2,6-di-tert-butylphenol, using alumina as a catalyst, phenol and C4 raffinate stream containing isobutene and 1-butene or 2-butene in the 70°C-130°C, under the reaction conditions of normal pressure, the source of the reaction raw material is easy to obtain, but the reaction conversion rate is not high, the composition of the reaction solution is complicated, and the subsequent separation is difficult; patent CN 1844071A This patent provides the preparation of high selectivity 2 , a new method for 6-di-tert-butylphenol, the reaction of phenols with isobutene in the presence of triphenoxyaluminum catalyst

The reaction is performed under high temperature and high pressure, and the reaction yield can reach more than 80%. The reaction has good selectivity, but the catalyst is easily soluble in the reaction solution, and the follow-up treatment costs are high, and metal ion wastewater is easily generated, and the environmental protection cost is high.

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