Modified molecular sieve for olefin purification and method for removing oxygen impurities from olefins by modified molecular sieve

A molecular sieve and modification technology, applied in separation methods, chemical instruments and methods, and combustible gas purification/transformation, etc., can solve the problems of inability to directly treat olefin monomers with olefins, no mention of adsorption effects, and low oxygen-containing impurities. , to achieve the effect of wide range of adsorption, enhanced interaction force and low purification cost

Active Publication Date: 2018-06-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents use rectification to purify olefins, which consumes a lot of energy, and the purity of the obtained olefin products is low, generally below 99.9%. Trace oxygen-containing impurities have an impact on the downstream application of olefins, and often need to be processed through advanced purification processes
[0005] Chinese patent CN103495378A discloses a microsphere adsorbent with kaolin, alumina and submicron molecular sieve as components to remove trace amounts of methanol, dimethyl ether and propionaldehyde in olefin streams. Oxygen-containing impurities in olefins are The component content is treated from 10-200ppm to less than 1ppm. Chinese patent CN102942436A discloses a method for adsorbing trace amounts of methanol, dimethyl ether, MTBE, TBA, and water in isobutylene with molecular sieves modified by metal oxides. Oxygen compounds are reduced from less than 300ppm to 1-10ppm,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of modified molecular sieve

[0026] Weigh 2.5g of chromium oxide and 5.4g of terephthalic acid in 100mL of hydrochloric acid solution with a concentration of 5mol / L, stir and dissolve completely, seal and heat to 220°C, and maintain for 5h to obtain a slurry liquid, stir in the slurry liquid Add 29.2g of 3A molecular sieve powder, after continuous stirring for 30min, cool to room temperature, sedimentation and suction filtration, wash with acetone to obtain light green powder, dry at 300°C, atomic absorption spectrometry detects that the metal organic compound compound content of Cr is 21.3wt%, molecular sieve The content is 78.7wt%, and it is granulated into a spherical shape with a particle diameter of 3mm.

[0027] Olefin purification

[0028] Fill the absorption tower with 100ml spherical modified molecular sieve, pressure 0.5Mpa, 30°C, space velocity 1.5h -1 Under certain conditions, the isobutylene raw material containing 0.25wt% of water, 0.05wt% o...

Embodiment 2

[0030] Preparation of modified molecular sieve

[0031] Weigh 3.6g of chromium oxide and 8.1g of terephthalic acid in 100mL of hydrochloric acid solution with a concentration of 5mol / L, stir and dissolve completely, seal and heat to 275°C, and maintain for 5h to obtain a slurry liquid, stir in the slurry liquid Add 28.1g of 3A molecular sieve powder, and after continuous stirring for 30min, cool to room temperature, settling and suction filtration, wash with acetone to obtain a light green powder, dry at 330°C, the atomic absorption spectrometry detects that the metal organic compound content of Cr is 29.4wt%, and the molecular sieve content It is 70.6wt% and granulated into a spherical shape with a particle diameter of 3mm.

[0032] Olefin purification

[0033]Fill the absorption tower with 100ml spherical modified molecular sieve, pressure 0.8Mpa, 20°C, space velocity 2h -1 Under certain conditions, the isobutylene raw material containing 0.4wt% of water, 0.15wt% of methan...

Embodiment 3

[0035] Preparation of modified molecular sieve

[0036] Weigh 3.1g of chromium oxide and 6.7g of terephthalic acid in 100mL of hydrochloric acid solution with a concentration of 4mol / L, stir and dissolve completely, seal and heat to 250°C, and maintain for 8h to obtain a slurry liquid, stir in the slurry liquid Add 29.9g of 3A molecular sieve powder, and after continuous stirring for 30min, cool to room temperature, sedimentation and suction filtration, wash with acetone to obtain a light green powder, dry at 260°C, the content of metal-organic compounds of Cr is 24.7wt%, and the content of molecular sieves is 24.7wt% as detected by atomic absorption spectrometry. It is 75.3wt% and granulated into a spherical shape with a particle diameter of 3mm.

[0037] Olefin purification

[0038] Fill the absorption tower with 100ml spherical modified molecular sieve, pressure 1.5Mpa, 45°C, space velocity 3h -1 Under certain conditions, the isobutylene raw material containing 0.29wt% of...

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PUM

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Abstract

The invention provides a modified molecular sieve for olefin purification and a method for removing oxygen impurities from olefins by the modified molecular sieve. The modified molecular sieve is modified with an organometallic compound. The method comprises the following steps: olefin flow containing water, ether, aldehyde, ketone, alcohol and other oxygen impurities passes through an organometallic compound modified molecular sieve bed layer, and high-purity olefin flow is obtained. The molecular sieve bed layer can be regenerated by purging with inert gas at a high temperature after the molecular sieve bed layer is saturated. Olefins, especially isobutene, purified with the method meets the standard of high purity and can be applied to polymerization-stage reaction and organic synthesisreaction.

Description

technical field [0001] The invention relates to a modified molecular sieve for purifying olefins and a method for removing oxygen-containing impurities in olefins by using the modified molecular sieve. Background technique [0002] The double bond groups in olefins have good reactivity, and can undergo addition reactions such as hydrogenation, halogenation, hydration, halogenation, hypohalogenation, sulfation, epoxidation, polymerization, etc., and can also be oxidized to cause double bond breaks , generating aldehydes, carboxylic acids, etc. [0003] Olefins are also the main chemical raw materials in industrial production. At present, the widely used bulk olefin chemical raw materials include ethylene, propylene, 1-butene, 2-butene, isobutene, etc. Due to the difference in production process, most olefin products contain Some oxygen-containing compounds, oxygen-containing compounds are mainly some water, ether, alcohol, ketone, aldehyde and other compounds. Although the p...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/34C07C7/13C07C11/09
CPCB01J20/186B01J20/223B01J20/28066B01J20/3408B01J20/3425B01J20/3483C07C7/13C07C11/09
Inventor 王中华袁帅董龙跃黄少峰刘振峰吕艳红黎源张本才
Owner WANHUA CHEM GRP CO LTD
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