Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/46—Removing components of defined structure
  • B01D53/48—Sulfur compounds
  • B01D53/52—Hydrogen sulfide
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/02—Treatment of water, waste water, or sewage by heating
  • C02F1/025—Thermal hydrolysis

Definitions

• the invention relates to a method for the decomposition of waste eyes from absorption processes, such as z. B. in the absorption of H 2 S in the presence of HCN and oxidizers, such as. B. O 2 with alkali solutions.
• oxidative wet cleaning processes which enable desulfurization down to the quality of long-distance gas, are characterized by absorption in alkaline solution and oxidation of the hydrogen sulfide with atmospheric oxygen to elemental sulfur in the same solution (cf.Ullmanns Encyklopadie der Technische Chemie, 4th edition, 1977, volume 14, page 553/554).
• Stretford process z. B. sodium carbonate dissolved in the detergent for absorption of the H 2 S (cf. reference above, page 439/440).
• the pollutant content of the absorption solution in the circuit is controlled by the amount discharged from the circuit. This amount is strongly dependent on process parameters such. B. the HCN and O 2 content of the gas, the alkalinity and the pH of the solution, so that, under unfavorable conditions, up to 40% of the absorbed sulfur (H 2 S) to pollutants such as thiocyanate, thiosulfate and sulfate -Ions are converted.
• H 2 S absorbed sulfur
• the pollutant ions are an alkali, such as. B. Na or K + bound, which is released during the cleavage and can react as alkali melt in the cleavage reactor with the refractory masonry before it is quenched in a subsequent water bath and recovered as alkali carbonate.
• the object underlying the invention is to propose a method of the type defined in the introduction, in which the waste eyes from absorption processes, such as, for. B. the Stretford Process, regenerated in a simple manner and the toxic pollutants are eliminated or converted.
• This conversion is a function of the temperature and the proportion of activator.
• This activator is e.g. B. NH 3 , which at higher temperatures and pressures and energy supply in an aqueous solution in accordance with active atoms
• the TDH can additionally be activated by adding NH 3 or compounds containing NH 2. It is also possible to process the waste eye of the HCN absorber, which essentially contains SCN and the waste eye of the HS absorber, which additionally contains S 2 O 3 2- and SO 4 2- , in separate TDII stages. However, only the waste eye of the HCN absorber in the TDH stage and the waste eye of the H 2 S absorber, which is smaller by comparison, can be split by gas phase hydrolysis in a reducing atmosphere at temperatures of more than 800 ° C.
• the hydrolyzate obtained at the TDH is expediently degassed in a so-called relaxation stripper with the addition of energy, the sour gas obtained being returned to the raw gas with H 2 S, CO 2 and NH 3 to the precooler and the regenerated alkali solution to the H 2 S absorption system.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Water Supply & Treatment (AREA)
• Hydrology & Water Resources (AREA)
• Analytical Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• General Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Biomedical Technology (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Treating Waste Gases (AREA)
• Industrial Gases (AREA)
• Treatment Of Water By Oxidation Or Reduction (AREA)
• Carbon And Carbon Compounds (AREA)
• Processing Of Solid Wastes (AREA)

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Applications Claiming Priority (2)

Publications (1)

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ID=6376749

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Cited By (2)

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Citations (3)

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• 1989
  • 1989-03-20 DE DE3909062A patent/DE3909062A1/de active Granted
• 1990
  • 1990-03-16 EP EP90904796A patent/EP0464066B1/de not_active Expired - Lifetime
  • 1990-03-16 ES ES90904796T patent/ES2058899T3/es not_active Expired - Lifetime
  • 1990-03-16 DE DE9090904796T patent/DE59001893D1/de not_active Expired - Lifetime
  • 1990-03-16 WO PCT/EP1990/000441 patent/WO1990011252A1/de not_active Ceased

Patent Citations (3)

Non-Patent Citations (1)

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