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Method for processing sulphur-containing exhaust air with fetor escaped from storage tank

A treatment method and technology for waste gas, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of large adsorbent amount, increased equipment investment, low adsorption efficiency, etc.

Active Publication Date: 2009-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this patent is aimed at the purification of hydrocarbon waste gas with high concentration, there are also the above-mentioned dangerous safety problems caused by excessive heat of adsorption
[0011] Although other non-flammable adsorbents can also be used in the adsorption process of VOCs, generally speaking, the adsorption efficiency is low, the amount of adsorbent required is large, the investment in equipment is increased, the adsorption amount of VOCs is low when it penetrates, and frequent regeneration is required processing, causing inconvenience to the operation

Method used

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  • Method for processing sulphur-containing exhaust air with fetor escaped from storage tank

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Embodiment 1

[0035] In this embodiment, the absorption-two-stage adsorption method is used to treat the breathing gas of sulfur-containing sewage tanks, wherein the sulfide concentration is 300 mg / m 3 , the total hydrocarbon concentration is 15% (volume ratio), adopts the vacuum desorption condensation method to reclaim hydrocarbons, the absorption liquid adopts sodium carbonate (adjusting the pH value to use) and iron trichloride mixed solution, organic auxiliary agent ethylenediaminetetraacetic acid, wherein Fe 3+ Concentration is 2.8g / L, EDTA and Fe 3+ The molar ratio is 1:1, the pH value of the solution is 9, and the absorption liquid-gas ratio is 2.0L / m 3 . The nonflammable adsorbent in the lower layer of the adsorption tower is commercially available silica gel with a specific surface area of ​​713m 2 / g, pore volume 0.39ml / g, average pore diameter 2.2nm. The upper layer is commercially available activated carbon with a specific surface area of ​​1013m 2 / g, pore volume 0.49ml / g...

Embodiment 2

[0039] Escaping exhaust gas from an oil tank, in which sulfides are 100mg / m 3 , the total hydrocarbon concentration is 30% (volume ratio), and the hydrocarbons are recovered by steam desorption and condensation. The absorption solution is a mixed solution of sodium carbonate, iron salt, triethanolamine and tartaric acid, wherein sodium carbonate is 16g / L, ferric chloride is 1g / L, triethanolamine is 2g / L, tartaric acid is 2.5g / L, and the pH value of the solution is 10 . The absorption liquid-gas ratio is 4.5L / m 3 . The lower layer is commercially available zeolite with a specific surface area of ​​750m 2 / g, pore volume 0.4ml / g, the upper layer is commercially available activated carbon, specific surface area 884m 2 / g, pore volume 0.4ml / g, average pore diameter 1.5nm, steam desorption, condensation temperature 25°C, volume ratio of zeolite to activated carbon 30:70, total volume space velocity 800h -1 . After being treated by the process, the total hydrocarbon concentrat...

Embodiment 3

[0041] By the process of embodiment 1, the volume ratio of silica gel adsorbent and active carbon adsorbent is 80: 20, and total volume space velocity is 1000h -1 , Adsorption needs to be regenerated after 4 hours. After the process is processed, the total hydrocarbon concentration of the outlet gas is less than 20ppm, and the recovery rate is 100% (by mass). The adsorption ambient temperature is 22°C, the maximum temperature of the silica gel adsorption bed is 40°C, and the temperature of the activated carbon bed is 50°C.

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Abstract

The invention discloses a method for treating sulfur-bearing niffy waste gas emitted from a storage tank, which includes the following process: the waste gas is firstly decarbolized and then sequentially passes through a noncombustible adsorbent bed layer and a flammable adsorbent bed layer; the noncombustible adsorbent includes silica gel, molecular sieve or alumina, the flammable adsorbent includes activated carbon or activated carbon fibers, the volume ratio of noncombustible adsorbent to flammable adsorbent is 20:80 to 80:20. By adopting the method of the invention, the concentration of the niffy gas emitted from the storage tank can meet the relevant national standards, and the hydrocarbon concentration of waste gas also can meet the relevant national standards; furthermore, the treatment process is simple and has no potential safety hazard. The method of the invention is mainly applied to the places where sulphid and hydrocarbon waste gas can be generated, for instance, an oil tank, an oily sewage tank, a device which can generate sulfur-bearing hydrocarbon waste gas in hydrocarbon processing course, etc.

Description

technical field [0001] The invention relates to a method for treating malodorous waste gas of a storage tank. This process adopts the absorption-two-stage adsorption process to purify the sulfur-containing and odorous waste gas escaped from the storage tank and recover the hydrocarbons in the waste gas. After being purified by the process of the present invention, the exhausted sulfur-containing and odorous waste gas from the storage tank can reach relevant national standards. It is especially suitable for the field of purification and recovery of sulfur-containing and odorous waste gas produced by oil storage tanks, oily sewage tanks and hydrocarbon processing equipment. Background technique [0002] Refinery contains various storage tanks, such as sulfur-containing sewage tanks, oil intermediate tanks, etc., which are important sources of odor gas emission. The odor gas emitted contains high concentrations of volatile hydrocarbons, hydrogen sulfide, organic sulfide, ammon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/04
Inventor 郭兵兵刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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