Preparation method of porous nano carbon material and application of porous nano carbon material in separation of propylene/propane

A technology of nano-carbon and propylene, which is applied in the direction of nano-carbon, separation method, dispersed particle separation, etc. It can solve the problems of cumbersome preparation steps, affect separation efficiency, reduce mass transfer rate, etc., and achieve the effect of broad industrial prospects and high-efficiency separation ability

Pending Publication Date: 2022-07-01
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although these porous carbon adsorbents increased the C 3 h 6 / C 3 h 8 However, a two-step carbonization-activation process is used in the preparation of porous carbon materials, the preparation steps are cumbersome, and its microscopic morphology is an irregular block, and the long diffusion path at the nanoscale limits the diffusion of gas molecules. The mass transfer process reduces the mass transfer rate, thereby affecting its separation efficiency
Chinese patent CN 111229164 adopts a one-step carbonization process to prepare a microporous nano-carbon adsorbent with continuous pores. Although the mass transfer rate of the material is improved, the pore volume of the material is small (3 / g), with a wide pore size distribution, resulting in low adsorption capacity
Currently, porous carbon adsorbents are 3 h 6 / C 3 h 8 Separation is faced with the incompatibility of high adsorption capacity, high selectivity and fast diffusion rate

Method used

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  • Preparation method of porous nano carbon material and application of porous nano carbon material in separation of propylene/propane
  • Preparation method of porous nano carbon material and application of porous nano carbon material in separation of propylene/propane
  • Preparation method of porous nano carbon material and application of porous nano carbon material in separation of propylene/propane

Examples

Experimental program
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Effect test

Embodiment 1

[0022] For the synthesis method of the phenalkamine polymer used in Example 1, refer to the preparation method of the document React.Funct.Polym., 2017, 121, 51, and the molecular weight of the phenalkamine polymer is 5900 g / mol. The phenalkamine polymer was placed in a tube furnace, purged for 2 h in a mixed atmosphere with an oxygen / argon volume ratio of 1:500 and a total flow rate of 300 mL / min, and then under an oxygen / argon mixed gas atmosphere from room temperature to 5 °C / min to 900 °C, constant temperature for 2 h, and cooled to room temperature to obtain porous nanocarbon NC-1. The pore size of ultra-micro pores is concentrated in 0.52-0.60nm, and the specific surface area is 560m 2 / g, micropore pore volume 0.28cm 3 / g. At 25°C and 1bar, C 3 H 6 and C 3 H 8 The static adsorption amounts were 2.75 mmol / g and 1.21 mmol / g, respectively, the IAST separation selectivity was 301, and the C 3 H 6 The interdiffusion constant is 8.6 × 10 -4 s -1 .

Embodiment 2

[0024] For the preparation method of the phenolic polymer used in Example 2, refer to the preparation method reported in the document "Chemical New Materials", 2015, 6, 158, and the molecular weight of the phenolic polymer is 26000 g / mol. The phenolic polymer was placed in a tube furnace, purged for 1 h in a mixed atmosphere with a hydrogen / argon volume ratio of 1:100 and a total flow rate of 200 mL / min, followed by a hydrogen / argon mixed gas atmosphere from room temperature to 8 ℃ / min was raised to 1000 ℃, constant temperature was 2 h, and cooled to room temperature to obtain porous nanocarbon NC-2. The pore size of ultra-micro pores is concentrated in 0.48-0.60nm, and the specific surface area is 669m 2 / g, micropore pore volume 0.28cm 3 / g. At 25°C and 1bar, C 3 H 6 and C 3 H 8 The static adsorption amounts were 3.53 mmol / g and 1.02 mmol / g, respectively, the IAST separation selectivity was 525, and the C 3 H 6 The interdiffusion constant is 6.6 × 10 -3 s -1 .

Embodiment 3

[0026]For the preparation method of the aldamine polymer used in Example 3, refer to the preparation method reported in the Journal of Molecular Structure, 2018, 1163, 22, and the molecular weight of the aldamine polymer is 12700 g / mol. The aldamine polymer was placed in a tube furnace, purged for 2 h under a mixed gas atmosphere with an oxygen / nitrogen volume ratio of 1:25 and a total flow rate of 100 mL / min, and then under an oxygen / nitrogen mixed gas atmosphere from room temperature to 2 ℃ / min was raised to 800 ℃, constant temperature was 0.3 h, and cooled to room temperature to obtain porous nanocarbon NC-3. The pore size of ultra-micro pores is concentrated in 0.52-0.60nm, and the specific surface area is 520m 2 / g, micropore pore volume 0.26cm 3 / g. At 25°C and 1bar, C 3 H 6 and C 3 H 8 The static adsorption amounts were 2.58 mmol / g and 1.11 mmol / g, respectively, the IAST separation selectivity was 296, and the C 3 H 6 The interdiffusion constant is 4.8 × 10 -4 ...

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Abstract

The invention provides a preparation method of a porous nano carbon material and an application of the porous nano carbon material in separation of propylene / propane, an oxidizing or reducing gas and an inert gas are selected to be mixed in a carbonization process, the volume ratio of the oxidizing or reducing gas to the inert gas is 1: 500-1: 20, the total flow of the mixed gas is 50-500mL / min, and in a pyrolysis process, the reaction temperature is controlled to be 30-60 DEG C, and the reaction time is controlled to be 30-60 minutes. Oxidizing or reducing gas directly participates in condensation, thermal polycondensation and condensed cyclization reaction of a carbon precursor polymer, generation and accumulation of graphite-like carbon microcrystals are promoted, the surface of a carbon material is eroded during pyrolysis, closed pores are opened, and uniform ultra-micropore and large-micropore-volume structures are formed. According to the method, the porous nano carbon material with concentrated ultra-micropore aperture distribution and large micropore volume can be obtained without adding a metal additive and a secondary activation process, the C3H6 / C3H8 separation process with high adsorption capacity, high selectivity and fast diffusion rate is realized, and the method has a wide industrial prospect.

Description

technical field [0001] The invention belongs to the field of gas separation, and relates to a preparation method of a porous nano-carbon material and its application in separating propylene / propane. Background technique [0002] Propylene (C 3 H 6 ) and propane (C 3 H 8 ) are important high-value chemicals. Among them, C 3 H 6 It is an important raw material for the manufacture of the world's second largest synthetic plastic polypropylene. 3 H 6 Demand increases substantially, while C 3 H 8 It is commonly used as refrigerant and internal combustion engine fuel, and is widely used in daily life. However, C in the petrochemical industry 3 H 6 and C 3 H 8 Often exists in the form of a mixture, which needs to be separated to obtain high-purity C 3 H 6 and C 3 H 8 , in order to meet the needs of the product market. [0003] Currently reported applications for the adsorption separation of C 3 H 6 / C 3 H 8 Porous solid adsorbents for mixed gas mainly include ...

Claims

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Application Information

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IPC IPC(8): C01B32/15B01D53/02
CPCC01B32/15B01D53/02B01D2253/102B01D2253/308B01D2253/311
Inventor 陆安慧徐爽
Owner DALIAN UNIV OF TECH
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