Olefin hydration reaction device and olefin hydration method

Abstract

The invention discloses an olefin hydration reaction device and an olefin hydration method. The olefin hydration reaction device comprises micro-channel mixing equipment I, micro-channel mixing equipment II and an olefin hydration reactor. The olefin hydration method comprises the following steps: mixing an olefin phase and a water phase with a water-to-olefin ratio greater than or equal to 1 through a micro-channel mixing device I to form a mixed material I, entering the mixed material I from the bottom of an olefin hydration reactor as a main reaction material, mixing an olefin phase and a water phase with a water-to-olefin ratio less than 1 through a micro-channel mixing device II to form a mixed material II, and introducing the mixed material II into the reactor as an enhanced mass transfer material, the mixed material I and the mixed material II are subjected to an olefin hydration reaction in a catalyst bed layer, and a reaction product flows out from an outlet in the top of the reactor and enters a next separation unit. By improving the mixed state of olefin and water and the mixed feeding mode, the mass transfer of the whole reaction process is enhanced, the olefin hydration reaction rate and the raw material per pass conversion rate are improved, the water-olefin ratio is reduced, and the production efficiency of an olefin hydration device is improved.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to an olefin hydration reaction device and an olefin hydration method. Background technique [0002] The olefin hydration process is a liquid (olefin)-liquid (water)-solid (catalyst) three-phase catalytic reaction, so the reaction rate and conversion rate are greatly affected by liquid-liquid mass transfer. However, the mutual solubility of the two liquid phases of olefin and water is small, which restricts the reaction efficiency and production capacity of the olefin hydration process. Among olefin hydration reactions, cyclohexene hydration to cyclohexanol, n-butene hydration to sec-butanol, isobutene hydration to tert-butanol, and isoamyl hydration to tert-amyl alcohol are typical and important olefin hydration reactions. [0003] In the process of cyclohexene hydration to cyclohexanol, the reactor form of the cyclohexene direct hydration production ...

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Problems solved by technology

[0003] In the process of cyclohexene hydration to cyclohexanol, the reactor form of the cyclohexene direct hydration production device currently used in industry is a two-stage series fully mixed tank reactor, and the single-pass conversion rate is low (generally <10%). Cause a large amount of unreacted cyclohexene and cyclohexanol to be separated by multiple cycles of rectification, and the energy consumption is high

[0004] CN109651081A proposes a reactive distillation method for preparing cyclohexanol by hydration of cyclohexene and its device. In the method, a phase transfer catalyst is added to the reaction liquid, so that cyclohexene, water, catalyst and phase transfer catalyst form a slurry state solution , cyclohexene hydration reaction occurs in the reactive distillation column to generate cyclohexanol. Although the reactive distillation method can theoretically greatly increase the conversion rate of cyclohexene and reduce system energy consumption, the rate of hydration reaction is slow

CN1304917A adopts the method of feeding isobutene and water countercurrently into the tower, and the product tert-butanol is continuously discharged from the tower, so as to increase the concentration difference between the two phases, improve the reaction rate and the conversion rate of isobutene, but the method has a large water ratio and a high space velocity. Small size, difficulty in catalyst molding, etc.

CN98812676.1 provides a method for producing tert-butanol. In order to increase the miscibility of mixed carbon four and water, tert-butanol is added to the reaction raw materials, and the conversion rate of the reaction can reach 80-90%. The method relies on The role of the centrifugal pump is to force the three-phase mixing of tert-butanol, water, and liquid C4Hs to promote dissolution, but the actual use of the centrifugal pump method for forced mixing is only macroscopic mixing between phases, and it is difficult to mix evenly on the microscopic level

[0006] To sum up, for olefin hydration reactions (generally cyclohexene hydration to cyclohexanol, n-butene hydration to sec-butanol, isobutene hydration to tert-butanol, isoamyl hydration to tert-amyl alcohol), the ratio of olefin to water Miscibility greatly affects mass transfer reaction rate

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