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PX adsorbent and preparation method thereof

An adsorbent and X-ray technology, applied in the field of paraxylene removal, can solve the problem of poor PX adsorption effect, and achieve the effect of high porosity, large specific surface area and uniform porosity

Active Publication Date: 2020-04-07
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing adsorbents have poor adsorption effect on PX, so PX adsorbents with high adsorption capacity, high removal rate, reusability and stable structure have always been a research hotspot.

Method used

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  • PX adsorbent and preparation method thereof
  • PX adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation of embodiment 1 PX adsorbent

[0055] 1) Crab shell pretreatment

[0056] Soak 40g of Portunus crab shells in 80mL of hydrochloric acid solution with a concentration of 2mg / L for 12 hours, remove calcium carbonate, rinse with distilled water to remove residual hydrochloric acid and salts on the surface, and then dry in an oven at 70°C for 24 hours;

[0057] 2) Carbonization of crab shells

[0058] The portunus crab shells after pretreatment in step 1) are pulverized, placed in a tube furnace, under N 2 High temperature carbonization under atmosphere protection, N 2 The flow rate is 200mL / min, the temperature of the tube furnace is raised to 700°C at a rate of 10°C / min, and then maintained at this temperature for 2h;

[0059] 3) Crab Shell Activation

[0060] Grind the crab shells carbonized in step 2) into powder with a particle size of 200 mesh for subsequent activation experiments; mix the carbonized crab shell powder with KOH solid at a weight rat...

Embodiment 2

[0063] The preparation of embodiment 2 PX adsorbent

[0064] 1) Crab shell pretreatment

[0065] Soak 30 grams of hairy crab shells in 60 mL of hydrochloric acid solution with a concentration of 2 mg / L for 12 hours, remove calcium carbonate, rinse with distilled water to remove residual hydrochloric acid and salts on the surface, and then dry in an oven at 60 °C for 24 hours;

[0066] 2) Carbonization of crab shells

[0067] In step 1), the pretreated hairy crab shells are pulverized, placed in a tube furnace, under N 2 High temperature carbonization under atmosphere protection, N 2 The flow rate is 200mL / min, the temperature of the tube furnace is raised to 600°C at a rate of 10°C / min, and then maintained at this temperature for 2h;

[0068] 3) Crab Shell Activation

[0069] Grind the hairy crab shells carbonized in step 2) into powder, with a particle size of 100 mesh, for subsequent activation experiments; mix the carbonized crab shell powder with KOH solid at a weight ...

Embodiment 3

[0071] The preparation of embodiment 3 PX adsorbent

[0072] 1) Crab shell pretreatment

[0073] Soak 50g of mud crab shells in 100mL of 2mg / L hydrochloric acid solution for 12 hours to remove calcium carbonate, rinse with distilled water to remove residual hydrochloric acid and salts on the surface, and then dry in an oven at 80°C for 24 hours.

[0074] 2) Carbonization of crab shells

[0075] The mud crab shells after pretreatment in step 1) are pulverized, placed in a tube furnace, under N 2 High temperature carbonization under atmosphere protection, N 2 The flow rate of the tube furnace was 200mL / min, the temperature of the tube furnace was raised to 800°C at a rate of 10°C / min, and then maintained at this temperature for 2h.

[0076] 3) Crab Shell Activation

[0077] The mud crab shell after carbonization in step 2) is ground into powder, and particle size is 200 orders, is used for follow-up activation experiment. Carbonized crab shell powder and KOH solid are mixed...

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Abstract

The invention relates to the field of removal of p-xylene, and concretely relates to a PX adsorbent, a preparation method thereof and a method for adsorbing p-xylene by using the PX adsorbent. The PXadsorbent is prepared from crab shells by adopting a high-temperature oxygen-free hybridization technology, has a carbon black appearance, has a pore size of 1-5 nm, a pore volume of 1.023-1.149 cm<3>and a specific surface area of 1650.22-2045.68 m<2> / g, has two diffraction peaks of 20.3 DEG and 43.1 DEG through an X-ray diffraction spectrometer, and has absorption peaks at 3472 cm<-1>, 2351 cm<-1>, 1531 cm<-1>, 1439 cm<-1>, 1068 cm<-1> and 862 cm<-1> in the infrared spectrum. The PX adsorbent can be used for efficiently removing residual PX in water, the removal rate of the PX reaches up to87.5% within 5 min, and the highest adsorption capacity is 393.10 mg / g; and the PX adsorbent provides a new thought for high-valued utilization of crab shell waste resources, develops a new adsorbingmaterial for removal of PX, and is of great significance to solving the increasingly serious PX pollution problem in China.

Description

technical field [0001] The present invention relates to the removal field of p-xylene, be specifically related to a kind of PX adsorbent and preparation method thereof, and its method for adsorbing p-xylene. [0002] technical background [0003] PX (paraxylene), that is, p-xylene, a common chemical product of aromatic hydrocarbon series, is mainly used to prepare terephthalic acid or polyester, and is a raw material for the production of various industrial plastics. According to incomplete statistics, the total output of PX in my country in 2017 was as high as 13.8 million tons, and the production capacity showed a trend of increasing year by year. In addition, the first phase of Zhejiang Petrochemical's 40 million tons / year refining and chemical integration project has been put into operation in Zhoushan Green Petrochemical Base in May 2019, of which the annual output of PX is as high as 4 million tons. However, with the increase of PX production, the ensuing environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/30B01J20/20
CPCB01J20/28011B01J20/2808B01J20/28083B01J20/28066B01J20/28076B01J20/20B01J2220/4881
Inventor 纪丽丽陈瑛娜郭健宋文东王亚宁蔡璐
Owner ZHEJIANG OCEAN UNIV