Process for producing ethylene by ethanol dehydration

A technology of ethanol and ethylene, which is applied in the field of selective dehydration to generate ethylene, which can solve the problems of increasing the load of the sewage treatment system, lack of too much innovation and change, and blockage of the alkali washing tower, so as to achieve enhanced washing effect, improve processing capacity, and feed Effect of temperature and flow reduction

Inactive Publication Date: 2008-03-05
NANJING UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage of the two sets of devices is that except for changing the reactor to a fixed bed, the others are basically a replica of the petroleum ethylene process, and the technology used in the 1980s has not had much innovation and change, and it has not yet completely targeted ethanol. A competitive device designed for the characteristics of dehydration to ethylene
The cooling of the product often needs to consume a large amount of cooling water, and the waste water produced increases the load of the sewage treatment system; due to the high operating temperature of the quench tower, organic substances such as ethanol, ether, and aldehydes in the crude ethylene product are brought into the system due to incomplete cleaning. Alkali washing section, which leads to the blockage of the alkali washing tower from time to time

Method used

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  • Process for producing ethylene by ethanol dehydration
  • Process for producing ethylene by ethanol dehydration
  • Process for producing ethylene by ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Feed the fermented alcohol mash into the distillation system 1 composed of distillation towers, control the ethanol raw material whose ethanol outlet concentration is 55% from the distillation tower, the ethanol raw material obtained is not cooled, and is directly transported to the follow-up section with material pipelines, The material conveying pipeline is wrapped with thermal insulation material;

[0039] (2) The ethanol-water mixed vapor from the distillation system 1 passes through the gas-gas heat exchange device 2 and the heating device 3 to raise the temperature to 250°C;

[0040] (3) The ethanol-water mixed steam after the temperature rise enters the gas-solid catalytic reactor 4 to carry out the catalytic reaction; an isothermal tubular reactor with a tube diameter of 32mm, the heating medium is molten salt, and the catalyst adopts HZSM-5 molecular sieve, The bulk density of the molecular sieve is 0.65kg / L, the filling height in the reaction tube is 2600m...

Embodiment 2

[0046] (1) Feed the fermented alcoholic mash into distillation system 1 composed of distillation towers. Distillation system 1 adopts a double-tower rectification process to obtain ethanol-water mixed vapor with a concentration of 95% from the second rectification tower, and the obtained ethanol -Water mixed steam is not cooled, and is directly transported to the catalytic ethylene production section through material pipelines, and the material delivery pipelines are wrapped with thermal insulation materials;

[0047] (2) The ethanol-water mixed vapor from the distillation system 1 passes through the gas-gas heat exchange device 2 and the heating device 3 in sequence to raise the temperature to 350°C;

[0048] (3) the ethanol-water mixed vapor after heating enters gas-solid catalytic reactor 4 and carries out catalytic reaction, adopts multistage adiabatic bed reactor, bed diameter 800mm; Catalyst is active alumina, and the bulk density of catalyzer is 0.78kg / L, the filling h...

Embodiment 3

[0054] (1) The fermented alcohol mash is passed into a distillation system 1 composed of distillation towers, and the distillation system 1 adopts a double-tower rectification process. The second rectification tower obtains ethanol-water mixed vapor with a concentration of 95%, and the obtained ethanol-water mixed vapor is not cooled, but is directly transported to the catalytic ethylene production section through material pipelines, and the material delivery pipelines are wrapped with thermal insulation materials;

[0055](2) The 95% ethanol-water mixed vapor from the distillation system 1 is evenly mixed with the water vapor at 127°C and 0.25 MPa in a molar ratio of 275:41 (mass ratio is 7.38:100) through a gas jet mixing device , to obtain a concentration of 75% ethanol-water mixed gas;

[0056] (3) The ethanol-water mixed gas with a concentration of 75% is heated up to 280° C. through the heating device 3;

[0057] (4) The ethanol-water mixed vapor after heating enters th...

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Abstract

The present invention is the process of producing ethylene with ethanol obtained through fermenting biomass as the material, and provides one biomass path of preparing ethylene. The present invention features the coupling of ethanol distilling process and chemically catalytic ethylene preparing process. The ethylene producing process includes: distilling 5-45 % concentration ethanol solution to obtain mixed ethanol-water vapor, heating the mixed ethanol-water vapor to 150-350 deg.c, catalytic reaction in a gas-solid reactor to obtain coarse ethanol product, cooling, gas-liquid separating to eliminate components with boiling point higher than 70 deg.c and obtain ethylene gas, and washing, drying and refining to obtain ethylene product. The ethylene producing process has low comprehensive power consumption, low cost and high marketability.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a process for selectively dehydrating ethanol as a raw material to generate ethylene. Background technique [0002] Ethylene is an extremely important organic chemical basic raw material, known as the "mother of petrochemical industry", mainly used to produce polyethylene, polyvinyl chloride, ethylene oxide, ethylene glycol, dichlorodioxane, ethylbenzene, Various important organic chemical products such as phenylethane, styrene, vinyl acetate, etc. At present, ethylene production methods at home and abroad are mainly produced by catalytic cracking of petroleum raw materials. In recent years, new breakthroughs have been made in the research on the production of ethylene from non-petroleum raw materials. For example, patent CN1569783A and patent CN1317468A reported a new method of hydrogenation of acetylene as raw material to prepare ethylene Process, patent CN86104433A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24
Inventor 黄和曾必文苏国东李慧胡燚胡耀池
Owner NANJING UNIV OF TECH
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