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Olefin hydration reaction method

An alkene hydration and alkene technology, applied in organic chemistry, hydroxyl addition preparation, etc., can solve the problems of long residence time, affecting mass transfer reaction rate, low mutual solubility, etc.

Pending Publication Date: 2022-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, for the process of olefin hydration, mainly cyclohexene hydration to cyclohexanol, n-butene hydration to sec-butanol), mass transfer is greatly affected by the low miscibility of olefins and water and easy phase separation. Therefore, how to make the two phases in a highly mixed state during the olefin hydration reaction without phase separation is a process route that can effectively solve the problems of low reaction rate and long residence time caused by the low mass transfer rate of olefin hydration. It is of great significance to greatly improve the olefin hydration reaction rate and single-pass conversion rate

Method used

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Examples

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Embodiment 1

[0043] Using the n-butene in Table 1 as raw material, the hydration reaction of n-butene with water under the action of a catalyst was used to prepare sec-butanol. The olefin and water mixture material I is introduced into the n-butene hydration reactor from the bottom of the reactor, and the hydration reactor is provided with three-stage catalyst beds. The water olefin mass ratio is introduced into the microchannel mixing device I with a ratio of 5.0:1 to form feed II, and the water olefin mass ratio is introduced into the microchannel mixing device II with a ratio of 1:3 to form feed III, feed II and feed III At the same time, it is introduced between the first / second and second / third catalyst beds to enhance the mutual solubility of olefin / water phase, realize efficient mass transfer, improve the single-pass conversion rate of olefin hydration reaction, and reduce the ratio of water to olefin. The reaction effluent leaves the reactor and enters the next separation unit. Th...

Embodiment 2

[0047] In this embodiment, the reaction raw materials, reactor structure, and reaction process are the same as in Embodiment 1. The difference is that the mixed feed II and mixed feed III formed by the microchannel mixing device I in this embodiment are respectively introduced from the second and third catalyst beds. Among them, the operating conditions of the microchannel mixing device I are as follows: the temperature is 170° C., and the pressure is 7.2 MPaG; the operating conditions of the microchannel mixing device II are as follows: the temperature is 170° C., and the pressure is 7.2 MPaG. The reaction conditions, residence time and raw material conversion are shown in Table 3.

Embodiment 3

[0049] In this embodiment, the reaction raw materials, reactor structure, and reaction process are the same as in Embodiment 1. Different from Example 1, the present embodiment adopts more moderate reaction conditions, and the operating conditions of the microchannel mixing device I are as follows: the temperature is 148° C., and the pressure is 6.0 MPaG; the operating conditions of the microchannel mixing device II are as follows: temperature It is 148°C and the pressure is 6.0MPaG. The reaction conditions, residence time and raw material conversion are shown in Table 3.

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Abstract

The invention discloses an olefin hydration reaction method which comprises the following steps: arranging a plurality of catalyst bed layers in an olefin hydration reactor, and dividing reaction mixed raw materials into a feed I, a feed II and a feed III; a feed I enters a first catalyst bed layer from the bottom of the olefin hydration reactor, a feed II is divided into x strands after being mixed and dispersed and is introduced into different bed layers from the catalyst bed layers, a feed III is divided into y strands after being mixed and dispersed and is introduced into different bed layers from the catalyst bed layers, and at least one strand of material in the x strands of the feed II and at least one strand of material in the y strands of the feed III are introduced into the same bed layer; all the fed materials are subjected to an olefin hydration reaction in the catalyst bed layer, and a final product flows out from the top of the reactor. According to the method disclosed by the invention, two reaction raw materials with different proportions are introduced between catalyst bed layers, so that the main reaction effect is enhanced, efficient mass transfer between olefin and water is realized, the olefin hydration reaction rate and the raw material per pass conversion rate are greatly improved, the number and the volume of reactors are reduced, and the energy consumption in the separation process is reduced.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, in particular to an olefin hydration reaction 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. The more typical ones are the hydration of cyclohexene to cyclohexanol and the hydration of n-butene to sec-butanol. The single-pass conversion rate in the prior art is low,...

Claims

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Application Information

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IPC IPC(8): C07C29/04C07C31/12
CPCC07C29/04C07C31/12
Inventor 周峰马会霞姜睿乔凯张淑梅杨秀娜
Owner CHINA PETROLEUM & CHEM CORP
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