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Refinery VOCs absorption and adsorption coupling treatment device and method

A treatment method and technology of treatment device, which are applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of shortened operation period of adsorbent, poor absorption performance, and low limit of emission requirements, and achieve improved absorption treatment. effect, absorption efficiency improvement, selectivity improvement effect

Active Publication Date: 2021-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the existing refinery VOCs absorption-adsorption coupling process cannot effectively remove benzene series in VOCs, and benzene series account for a relatively high proportion of VOCs, and the emission limit is getting lower and lower
Due to the poor absorption performance of existing absorbents such as diesel oil, naphtha and kerosene on benzene series in VOCs, the load of the rear adsorption process is significantly increased, and the operating cycle of the adsorbent is significantly shortened

Method used

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  • Refinery VOCs absorption and adsorption coupling treatment device and method
  • Refinery VOCs absorption and adsorption coupling treatment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] An adsorbent used in the adsorption tank of the present invention was prepared.

[0052] Take 100g of petroleum coke, dry it at -300kPa, 100°C for 5h, mix it with 300g of potassium hydroxide and 10g of copper hydroxide, and activate it at 900°C for 0.4h in a nitrogen atmosphere.

[0053] The sample was cooled, ground into powder, added to a 10wt% hydrochloric acid solution for washing until the pH of the filtrate was neutral, and then dried at 150°C for 6 hours to obtain an intermediate product of activated carbon.

[0054] Take 40 g of activated carbon intermediate product, use 100 g of nitric acid solution with a concentration of 4 mol / L to carry out surface oxidation modification, use supersaturated impregnation for 24 h, filter out the solid, and dry at 120 °C for 4 h. The dried activated carbon was treated for 12 hours at a temperature of 400°C under a nitrogen atmosphere, and it was recorded as Adsorbent A. The specific surface area of ​​adsorbent A is 2716 m 2 ...

Embodiment 2

[0056] Take 100g of petroleum coke, dry it at -300kPa, 100°C for 5h, mix it with 200g of potassium hydroxide and 4g of copper hydroxide, and activate it at 700°C for 0.3h under a nitrogen atmosphere.

[0057] The sample was cooled, ground into powder, added to a 10wt% hydrochloric acid solution for washing until the pH of the filtrate was neutral, and then dried at 150°C for 6 hours to obtain an intermediate product of activated carbon.

[0058] Take 40g of activated carbon intermediate product, use 100g of nitric acid solution with a concentration of 8 mol / L to carry out surface oxidation modification, use supersaturated impregnation for 24 h, filter out the solid, and dry at 120 °C for 4 h. The dried activated carbon was treated for 12 hours at a temperature of 400°C under a nitrogen atmosphere, and it was designated as adsorbent B. The specific surface area of ​​adsorbent B is 1716 m 2 / g, the pore volume is 0.85cm 3 / g; the iodine adsorption value is 1597 mg / g, and the C...

Embodiment 3

[0060] Gasoline oxidative sweetening tail gas and liquid hydrocarbon oxidative sweetening tail gas of a refining and chemical enterprise, the total hydrocarbon concentration is 2.6×10 5 mg / m 3 , the organic sulfide concentration is 5380 mg / m 3 , the concentration of benzene series is 1.31×10 4 mg / m 3 .

[0061] The exhaust gas first enters the first absorption tower I for countercurrent contact absorption, the absorbent is catalytic cracked gasoline for absorption, and then enters the second absorption tower II for countercurrent contact absorption, the absorbent is diesel distillate, and the absorbed liquid-gas ratio is 100L / m 3 , the absorption temperature is 30°C, the absorption pressure is 100kPa, and then it enters the adsorption tank for normal temperature and pressure adsorption. Two adsorption tanks are set up for adsorption regeneration alternately. The adsorption tank is filled with adsorbent A. Attached treatment, the heat medium is introduced into the collecti...

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Abstract

The invention provides a refinery VOCs absorption and adsorption coupling treatment device and method, wherein double absorption towers and an adsorption tank are adopted for absorption and adsorption respectively. The double absorption towers are packed with different absorbents, wherein an adsorption tank is filled with a copper-containing activated carbon adsorbent, the specific surface area of the adsorbent is 1700-3600 m2 / g, and the pore volume of the adsorbent is 0.85-1.35 cm 3 / g; the iodine adsorption value is 1500-3300 mg / g, and the loading capacity of Cu is 0.5 wt.%-8.0 wt.%. According to the method, a two-stage absorption method is selected, and different absorbents are selected to improve the selectivity of benzene series in VOCs according to the principle of similar intermiscibility. Besides, based on the copper-containing activated carbon adsorben, the selectivity of the copper-containing activated carbon adsorbent to benzene series in VOCs is improved.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and in particular relates to a treatment method and device for VOCs waste gas in a refinery. Background technique [0002] With the development of economy and progress of society, people pay more and more attention to environmental problems. Among various factors that lead to environmental pollution, volatile organic compounds (Volatile Organic Compounds) have become an important source of air pollution, and the control and treatment of VOCs has become one of the focuses of environmental protection. [0003] In organic solvents such as crude oil, light distillate oil, some chemical solvents (benzene, toluene, xylene), coatings, etc., contain or have highly volatile light hydrocarbon components, crude oil is used in mining, transportation, storage, transfer, During the processing, transportation, transfer, and sales of refined oil products (gasoline, diesel, etc.), a large amount of oil and gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14B01D53/04B01J20/20B01J20/30
CPCB01D53/18B01D53/1406B01D53/1487B01D53/1493B01D53/0407B01D53/0446B01J20/20B01J20/3078B01J20/3085B01D2252/20B01D2252/504B01D2253/102B01D2257/708B01D2259/4009B01D2259/40086Y02A50/20
Inventor 刘洋王新赵磊刘忠生李宝忠张明美郭兵兵
Owner CHINA PETROLEUM & CHEM CORP
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