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Method for continuous preparing olefin through alcohol dehydration

A technology for alcohol dehydration and olefins, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problems of high energy consumption and low efficiency, and achieve short reaction time and low reaction temperature. , the effect of small flow

Active Publication Date: 2020-06-19
YUNNAN ZHENGBANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency of high energy consumption and low efficiency in the prior art, and provide a method for continuously preparing olefins from alcohol dehydration

Method used

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  • Method for continuous preparing olefin through alcohol dehydration

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preparation example Construction

[0022] Preparation of sulfonated bamboo charcoal: refer to Xu Qiong, Xia Yue, Yin Dulin, et al. Preparation, characterization and acid catalytic performance of sulfonated bamboo charcoal;

[0023] Preparation of cotton charcoal sulfonic acid: refer to Fan Changling, Xu Zhongyu, Xu Qiong, et al. Preparation, characterization and acid catalytic performance of cotton charcoal sulfonic acid[J]. Carbon, 2009(1).

[0024] Preparation of carbon-based sulfonated solid acid catalysts: Li Baomin, Jiang Lei. Synthesis and catalytic performance of carbon-based sulfonated solid acid catalysts [EB / OL]. Beijing: China Science and Technology Papers Online [2012-02-21].

[0025] Alcohol dehydration continuous preparation of olefins device (see figure 1 ) comprises a continuous flow reactor 6, which has three reaction modules: the first reaction module 1, the second reaction module 2 and the third reaction module 3, each reaction module includes a passage for material reaction, for example, the...

Embodiment 1

[0029] A method for continuously preparing olefins by alcohol dehydration (use alcohol dehydration to continuously prepare olefins device, see figure 1 ), including the following steps:

[0030] After the low molecular weight alcohol A (mass concentration is 95% ethanol) passes into the steam generator 10 with the metering pump 9, passes into the first temperature control tube 11 of the first reaction module 1 of the continuous flow reactor 6, so that A The temperature is adjusted to the first set temperature of 70°C; solid dehydrating agent particles (sulfonated bamboo charcoal, particle size between 100 and 200 microns, water absorption efficiency ≥ 30% at room temperature) C pass through the pneumatic conveyor 8 in the carrier gas (nitrogen) Under the action of the second temperature control tube 12 of the first reaction module 1 of the continuous flow reactor 6, the temperature of C and B is adjusted to the first set temperature of 70 ° C; A, B and C are in the first In t...

Embodiment 2

[0032] A method for continuously preparing olefins by alcohol dehydration (using alcohol dehydration to continuously prepare olefins device, see figure 1 ), including the following steps:

[0033]After low molecular weight alcohol (mass concentration is 97% 2-butanol) A passes into steam generator 10 with metering pump 9, passes into the first temperature control tube 11 of the first reaction module 1 of continuous flow reactor 6, The temperature of A is adjusted to 80°C of the first set temperature; solid dehydrating agent particles (cotton charcoal sulfonic acid, particle size between 100~200 microns, water absorption efficiency ≥ 30% at normal temperature) C is loaded by pneumatic conveyer 8 Under the effect of gas (carbon dioxide), pass into the second temperature control tube 12 of the first reaction module 1 of continuous flow reactor 6, make the temperature of C and B be adjusted to the first setting temperature 80 ℃; A, B and C, in the main process 13 of the first rea...

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Abstract

The invention discloses a method for continuously preparing olefin through alcohol dehydration. The method comprises the following steps: introducing low-molecular-weight alcohol into a first reactionmodule of a continuous flow reactor to adjust the temperature to 70-80 DEG C; introducing solid dehydrating agent particles and carrier gas into the first temperature reaction module of the continuous flow reactor to adjust the temperature of the mixed material to 70-80 DEG C; introducing into the high-temperature reaction module of the continuous flow reactor after a low-temperature reaction inthe main tube pass of the first temperature reaction module; reacting at 90-160 DEG C, introducing the dehydration product into the tube pass of a third reaction module 3, reacting at 1-15 DEG C, introducing the dehydration product into a gas-solid separator through a pipeline, and separating out a gas phase D and a solid phase E; and carrying out membrane separation on the gas phase D to obtain carrier gas B and high-purity olefin F. According to the invention, alcohol is efficiently dehydrated, the reaction temperature is low, and the reaction time is short; and the method is environment-friendly and high in conversion efficiency.

Description

technical field [0001] The present invention relates to a process for the continuous preparation of olefins from alcohol dehydration in a continuous flow reactor. Background technique [0002] Olefins are organic compounds with carbon-carbon double bonds, and are important chemical raw materials, widely used in medicine, materials, and cosmetics industries. For example, ethylene, vinyl chloride and tetrafluoroethylene are used to synthesize common polymer materials such as polyethylene, polyvinyl chloride and polytetrafluoroethylene, respectively. [0003] The industrial olefin synthesis method is mainly to crack the heavy hydrocarbons in petroleum under high temperature and catalyst conditions to obtain small molecule olefins. Another way is to produce alkenes by dehydration of alcohols. The regeneration cycle of fossil resources such as oil is very long, and the consumption rate is increasing with the growth of the global population. The future may face the problem of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C7/00C07C11/04C07C11/08
CPCC07C1/24C07C7/005C07C2527/02C07C11/04C07C11/08Y02P20/52
Inventor 王寿元董灿生周文熊磊张存皓邹倩冯峰
Owner YUNNAN ZHENGBANG TECH CO LTD
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