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Microporous carbon adsorbent for separating c6 alkane isomer and c8 xylene isomer and its preparation method and application

A technology of adsorbent and microporous carbon, which is applied in the field of microporous carbon adsorbent and its preparation, can solve the problems that the purity of gas products cannot meet the requirements of industrial targets, poor specific recognition ability, low separation selectivity, etc., and achieve good Industrial application prospect, good stability and regeneration performance

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of molecular sieves still has certain limitations, such as low adsorption capacity and high energy consumption for desorption.
[0006] As a class of low-cost, stable structure, and large-scale production and use of adsorbents, carbon adsorbents have been widely recognized by people. However, the carbon adsorbents currently researched and produced are still unable to be used in C6 alkane isomers and C8 distillates. In the separation system of toluene isomers, because of its wide pore size distribution, the specific recognition ability of each isomer is poor, resulting in very low separation selectivity, so that the purity of the final gas product cannot reach to industry target requirements

Method used

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  • Microporous carbon adsorbent for separating c6 alkane isomer and c8 xylene isomer and its preparation method and application
  • Microporous carbon adsorbent for separating c6 alkane isomer and c8 xylene isomer and its preparation method and application
  • Microporous carbon adsorbent for separating c6 alkane isomer and c8 xylene isomer and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Add 10 g of glucose to 100 ml of neutral deionized water and mix well. Then, the reaction solution was transferred to the closed environment of the reactor, and the hydrothermal reaction was carried out at 190 °C for 14 h, and the obtained solid hydrated coke was fully washed with deionized water.

[0032] (2) After drying the hydrated coke, put it in a porcelain boat, and then put it in a high-temperature furnace for N 2 Atmosphere protection, the heating rate of 5 ℃ / min was raised to 800 ℃, followed by reduction pyrolysis reaction for 2 h, and then the temperature was cooled to room temperature with a cooling rate of 5 ℃ / min, and the micropore size distribution of the present invention was 5.8 Å - 6.8Å (over 70%) carbon sorbent, denoted as sample 1#, and finally subjected to the vapor adsorption test of C8 aromatic isomers.

Embodiment 2

[0034] (1) Add 8.33 μL of concentrated hydrochloric acid to 100 ml of deionized water to prepare an aqueous solution with a pH value of 3, and then add 10 g of glucose and mix well. Then, the reaction solution was transferred to the closed environment of the reactor, and the hydrothermal reaction was carried out at 190 °C for 14 h, and the obtained solid hydrated coke was fully washed with deionized water.

[0035] (2) After drying the hydrated coke, put it in a porcelain boat, and then put it in a high-temperature furnace for N 2 Atmosphere protection, the heating rate of 5 ℃ / min was raised to 800 ℃, followed by reduction pyrolysis reaction for 2 h, and then the temperature was cooled to room temperature with a cooling rate of 5 ℃ / min, to obtain the mesoporous pore size of the invention with a pore size of 5.0 Å -5.5 Å (over 75%) carbon adsorbent, denoted as sample 2#, and finally the vapor adsorption test of C6 alkane isomers.

[0036] The invention adopts the American ASAP...

Embodiment 3

[0042] (1) Add 0.054 μL of concentrated sulfuric acid to 100 ml of deionized water to prepare an aqueous solution with a pH value of 5, and then add 10 g of glucose and mix well. Then, the reaction solution was transferred to the closed environment of the reactor, and the hydrothermal reaction was carried out at 200 °C for 12 h, and the obtained solid hydrated coke was fully washed with deionized water.

[0043] (2) After drying the hydrated coke, put it in a porcelain boat, and then put it in a high-temperature furnace for N 2 Atmosphere protection, the heating rate of 5 °C / min was raised to 900 °C, followed by reduction pyrolysis reaction for 2 h, and then the temperature was lowered to room temperature at a cooling rate of 5 °C / min to obtain the mesoporous pores of the present invention with a pore size of 5.0 Å -5.5 Å (more than 60%) carbon adsorbent, denoted as sample 3#, and finally the vapor adsorption test of C6 alkane isomers, which can be used for linear molecules (n...

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Abstract

The invention discloses a microporous carbon adsorbent for separating C6 alkane isomers and C8 xylene isomers, and a preparation method and application thereof. The steps are: adding the catalyst into deionized water to prepare an aqueous solution with a pH value of 2.5-7, then adding a six-membered ring monosaccharide, stirring and mixing to obtain a reaction solution, wherein the mass ratio of the six-membered ring sugar to the aqueous solution is 5- 15:100; hydrothermally react the obtained reaction solution at 180-210 ° C, naturally cool after the reaction, suction filtration to retain the solid product, then wash and dry to obtain sugar-based hydrated coke; inert the obtained hydrated coke in a high-temperature furnace Under the protection of gas, the temperature is programmed to 800-1000° C. to carry out the pyrolysis carbonization reaction, and after the temperature is programmed to cool to room temperature, a narrow microporous carbon adsorbent is obtained, and the pore diameter of the narrow microporous carbon adsorbent is 4.8 Å-6.8 Å. The carbon adsorbent prepared by the present invention can separate C6 alkane isomers and C8 xylene isomers.

Description

technical field [0001] The invention relates to the technical field of angstrom carbon molecular sieve chemistry, in particular to a microporous carbon adsorbent for separating C6 alkane isomers and C8 xylene isomers, and a preparation method and application thereof. Background technique [0002] The separation of alkane isomers based on varying degrees of branching represents a critical but challenging process in the petrochemical industry. During the refining process, light naphtha fractions (mainly including linear C6 alkanes) undergo catalytic isomerization to generate linear (n-HeX), single-branched (3-MP) and double-branched (2,2- isomer of DMB). Isomers with higher degrees of branching generally have higher octane numbers (RON). For example, the RONs of 3-MP (75) and 2,2-DMB (94) are much higher than those of their linear isomer n-hexane (25). Therefore, in order to produce gasoline with high RON, alkane isomers with low RON need to be removed from the mixture and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C10G25/00B01J20/30
CPCB01J20/20C10G25/003
Inventor 肖静杜胜君黄佳武廖能黄保林
Owner SOUTH CHINA UNIV OF TECH