Method and apparatus for directly preparing K2SO4 after low concentration SO2 smoke gas absorbing oxidation

A K2SO4, SO2 technology, applied in the direction of sulfate/bisulfate preparation, etc., can solve the problems of high material consumption and high price, and achieve the effects of low production cost, low raw material consumption and energy consumption, and environmental protection

Inactive Publication Date: 2005-02-23
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing production technology, packed towers and sieve plate foam towers are generally used as absorption devices, which consume a lot of materials and are expensive

Method used

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  • Method and apparatus for directly preparing K2SO4 after low concentration SO2 smoke gas absorbing oxidation

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Effect test

Embodiment 1

[0014] Embodiment 1: (the process operating condition of the present embodiment is the same as the prior art, and the device is described in claim 2)

[0015] Dust below 100°C ≤ 200mg / Nm 3 , SO 2 4 ) 2 SO 3 , NH 4 HSO 3 , (NH 4 ) 2 SO 4 solution, the density of mother liquor is 1.2~1.24g / cm 3 , the alkalinity is 1.5~2.0tt°. SO 2 The flue gas collides with the reverse jet rotating liquid in a section of turbulent reverse spray swirling liquid absorption oxidation tower (4), forming a turbulent foam zone, and the gas-liquid film mass transfer surface is renewed quickly, SO 2 It is chemically absorbed as a sub-salt and due to the presence of oxygen in the gas stream, the catalytic effect of the catalyst is converted into (NH 4 ) 2 SO 4 , SO 2 After passing through a section of turbulent reverse spray liquid absorption oxidation tower (4), the absorption rate>80%, the absorbed SO 2 The produced nitrite is oxidized to (NH 4 ) 2 SO 4 , accounting for 98% of the tot...

Embodiment 2

[0017] Basically with embodiment 1. The difference is: a section of Fe +3 The amount of catalyst added is 0.1% of the solid content; the second stage S 2 o 3 -2 Catalyst addition is 0.2% of solid content; The 500g / L (NH 4 ) 2 SO 4 The aqueous solution is transported to the metathesis reactor (7) through the pump (15), and the saturated KCl solution is stirred and reacted at a temperature of 75°C to form K 2 SO 4 crystallization.

Embodiment 3

[0019] Basically with embodiment 1. The difference is: a section of Fe +3 The amount of catalyst added is 0.15% of the solid content; the second stage S 2 o 3 -2 Catalyst addition is 0.3% of solid content; The 550g / L (NH 4 ) 2 SO 4 The aqueous solution is transported to the metathesis reactor (7) through the pump (15) and reacts with the powdery solid at 90° C. to form K 2 SO 4 crystallization.

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Abstract

A process for directly preparing k2SO4 from low-concentration SO2 fume after absorbed and oxidized features that the (NH4) 2 SO4 solution generated after ammonia absorption and salt oxidization directly reacts on the KCL solution, and the reaction resultant is crystallized to obtain K2SO4. Its apparatus is composed of two absorbing-oxidizing towers, settling bath, mother liquid tank, reactor, dissolving bath, centrifugal filter, evaporator, crystallized, and liquid delivering pump.

Description

Technical field: [0001] The present invention relates to low concentration SO 2 Direct preparation of K after flue gas absorption and oxidation 2 SO 4 The method and the device thereof belong to the technical field of chemical engineering and environmental protection. Background technique: [0002] Ammonia absorption of SO 2 It is a mature technology (applied in domestic Dalian Chemical Plant, Nanjing Chemical Plant and other plants to absorb sulfuric acid tail gas), using ammonia method to recover sulfuric acid to produce low concentration SO in the tail gas 2 , so that the flue gas can be discharged up to the standard, and the nitrite product can be obtained at the same time, which can be produced by controlling different process conditions according to the needs (NH 4 ) 2 SO 3 or NH 4 HSO 3 . [0003] Many sulfuric acid factories further use the acid method to decompose the nitrite with excess sulfuric acid on the basis of ammonia absorption, and convert the nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/04
Inventor 曾子平刘应隆
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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