Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method and application of carbon molecular sieve for separating olefin and alkane

A carbon molecular sieve and olefin alkane technology, which is applied in the fields of carbon preparation/purification, adsorption purification/separation, chemical instruments and methods, etc., can solve the problems of wide pore size distribution, high defect content, difficult fine adjustment, etc., and achieves simple process operation. , to avoid the effect of carbon deposition

Active Publication Date: 2021-06-25
SOUTH CHINA UNIV OF TECH
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high defect content, difficult fine adjustment and wide pore size distribution in the current carbon molecular sieve carbon precursor, the present invention innovatively provides a preparation method and application of a carbon molecular sieve material with sieving properties for the separation of alkenes and alkanes. The production process of porous carbon materials is simple and low cost, and the defect content and graphitization degree of carbon precursors can be precisely adjusted. The prepared carbon molecular sieve has uniform and controllable pore size, and has excellent adsorption performance for sieving and separating alkenes and alkanes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of carbon molecular sieve for separating olefin and alkane
  • Preparation method and application of carbon molecular sieve for separating olefin and alkane
  • Preparation method and application of carbon molecular sieve for separating olefin and alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Mix 3g of wheat starch and 30mL of distilled water to form a mixture with a concentration of 0.03g / mL, and stir for 30min to disperse evenly. Then the mixture was transferred to the reactor for hydrothermal polymerization carbonization, the temperature was constant at 200°C, the pressure was 1.55MPa, and the reaction was carried out for 10h to obtain I D / I G Carbon microspheres with a value of 0.94.

[0050] (2) Fully wash the carbon microspheres with deionized water. After the solid is dried, it is placed in a high-temperature tube furnace, heated to 900°C at a rate of 5°C / min under a nitrogen atmosphere, and then carbonized and pyrolyzed for 1 hour. The product obtained after cooling is 1 # No. carbon molecular sieve material.

Embodiment 2

[0052] (1) Mix 6 g of cornstarch and 6 mL of distilled water to prepare a starch aqueous solution with a concentration of 1 g / mL, and stir for 30 min at room temperature to disperse evenly. Then the mixture was transferred to the reactor for hydrothermal polymerization, the temperature was constant at 190°C, the pressure was 1.24MPa, and the reaction was carried out for 14h to obtain I D / I G Carbon microspheres with a value of 0.87.

[0053] (2) Fully wash the carbon microspheres with deionized water. After the solid is dried, put it in a high-temperature tube furnace, heat it to 1000°C at a heating rate of 5°C / min under a nitrogen atmosphere, and then carbonize and pyrolyze it for 2 hours. The product obtained after cooling is 2 # No. carbon molecular sieve material.

Embodiment 3

[0055] (1) Mix 6g of cornstarch and 6mL of distilled water to form a mixture with a concentration of 1g / mL, and stir for 30min at room temperature to disperse evenly. Then the mixture was transferred to the reactor for hydrothermal polymerization, the temperature was constant at 190°C, the pressure was 1.24MPa, and the reaction was carried out for 14h to obtain I D / I G Carbon microspheres with a value of 0.87.

[0056] (2) Fully wash the carbon microspheres with deionized water. After the solid is dried, put it in a high-temperature tube furnace, heat it to 800°C at a rate of 5°C / min under a nitrogen atmosphere, and then carbonize and pyrolyze it for 2 hours. The product obtained after cooling is 3 # No. carbon molecular sieve material.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
adsorption capacityaaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method and application of a carbon molecular sieve for separating olefin and alkane. The method comprises the following steps of: adding a starch carbon precursor into a distilled water solvent to prepare a starch aqueous solution, uniformly stirring and dispersing, and then carrying out medium-pressure medium-temperature hydrothermal controllable polymerization and dehydration carbonization reaction in a reaction kettle to obtain homogeneous carbonaceous microspheres; and washing and drying the obtained carbonaceous microspheres, performing controlled high-temperature defunctionalization treatment at 700-1000 DEG C in an inert atmosphere, and controlling carbon layer rearrangement and heteroatom pyrolytic reaction to obtain the carbon molecular sieve material with uniform and adjustable ultra-microporous channels. Starch biomass which is low in price, non-toxic and harmless serves as a carbon source, carbonaceous microspheres are formed through a direct hydrothermal polymerization carbonization process, the defect content and the graphitization degree of the microspheres can be controlled by adjusting the reactant concentration, the carbon molecular sieve is obtained through pyrolysis at a corresponding calcination temperature, and fine adjustment of the aperture within a sub-angstrom precision range is realized.

Description

technical field [0001] The invention relates to the field of adsorption and separation materials for alkenes and alkanes, in particular to a carbon molecular sieve material with low cost, stable structure, uniform and adjustable pore size distribution, and the best characteristics of sieving and separating alkenes and alkanes. Background technique [0002] Propylene and ethylene are the two organic chemical raw materials and one of the basic petrochemical products with the largest output and consumption in the world. Owing to often containing unreacted alkane in the olefin product, and it and corresponding alkane (C 2 h 4 / C 2 h 6 , C 3 h 6 / C 3 h 8 ) have similar physical and chemical properties, making their separation and purification face great challenges. For more than 70 years, the industry still uses energy-intensive high-pressure cryogenic distillation columns for separation, and its energy consumption accounts for 10-15% of global energy consumption. Adsorp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C01B32/05C07C7/13C07C11/04C07C11/06C07C9/06C07C9/08B01J20/30
CPCB01J20/20C07C7/13C01B32/05B01J20/2808C01P2004/03C01P2002/82C07C11/04C07C11/06C07C9/06C07C9/08
Inventor 李忠杜胜君肖静夏启斌周欣
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products