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Separation method of sulfuric acid and sodium sulfate in organic sulfonate production wastewater

A separation method and technology of sodium sulfate, applied in chemical instruments and methods, alkali metal sulfite/sulfite, sulfur trioxide/sulfuric acid, etc., can solve the problems of adding lime cost, harming soil, and high salinity of wastewater

Inactive Publication Date: 2011-12-28
HUBEI SHENGHUA RENEWABLE ENERGY DEV
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  • Description
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  • Application Information

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Problems solved by technology

Resources are wasted in vain, and the cost of lime has to be added; the waste water has high salinity and harms the soil. At this stage, this has already become a burden for the chemical industry, and environmental protection experts are at a loss for waste water treatment.

Method used

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  • Separation method of sulfuric acid and sodium sulfate in organic sulfonate production wastewater
  • Separation method of sulfuric acid and sodium sulfate in organic sulfonate production wastewater
  • Separation method of sulfuric acid and sodium sulfate in organic sulfonate production wastewater

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Embodiment Construction

[0024] The waste water enters the tower through the pump feeding pipe 3 through the feeding screw nozzle 13, and falls freely in the form of mist. The feeding screw nozzle 13 is made of acid-proof stainless steel material. The high-pressure flue gas enters the Yanlong gas cabinet, enters the tower through the Yanlong air slot 7 and the air inlet 6 of the induced draft fan, and sends the waste heat flue gas of the evaporator to about 170°C-270°C, directly heating the liquid mist to evaporate, and the superheated steam goes upward with the smoke Entering the chimney tower, through the contact of the multi-layer grid and the filler 5 on the grid, multi-layer overlapping countercurrent contact, multiple heat exchanges, cascading contact heat exchange reactions occur, and water vapor continuously evaporates from the chimney mouth. Soot and liquid droplets flow into the bottom of the flue tower along the wall, and flow into the circulation pool 11 through the return pipe 10 at the bo...

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Abstract

The invention relates to a method for separating sulfuric acid and sodium sulfate in organic sulfonate production wastewater, in particular to a method for separating sulfuric acid and sodium sulfate in lignin wastewater. The waste water is heated to evaporate the water; after the evaporated waste liquid enters the circulation pool, it is circulated and evaporated by the circulation pump, and when the concentration of the evaporated waste liquid reaches 24-25 Baume When the temperature is high, it enters the cold circulation pool to separate the thenardite and the black liquor containing sulfuric acid. Heating-evaporation is carried out by using the residual heat of the flue gas, and the temperature of the residual heat of the flue gas is 170°C-270°C. After cooling for many times, Na2SO4·10H2O Na2SO4 · 10H2O mirabilite needle-like white crystals are fully separated. After Glauber's salt is taken out in the circulating pool, the rest is mainly sulfuric acid solution.

Description

technical field [0001] The invention relates to a method for separating sulfuric acid and sodium sulfate in organic sulfonate production wastewater, in particular to a method for separating sulfuric acid and sodium sulfate in lignin wastewater. Background technique [0002] In chemical production, a large amount of sulfuric acid and caustic soda are commonly used, and concentrated acid is used to extract or produce organic chemical products in alkaline solution. A large amount of excess sulfuric acid, accompanied by sodium sulfate, coexists in the tail liquid or the wastewater to be discharged. Example: The waste water from the production of lignin from the concentrated black liquor of papermaking contains a large amount of sulfuric acid and a certain amount of sodium sulfate. From the sulfonation reaction materials, the organic sulfonic acid products are neutralized with alkali and a large amount of waste water with similar components will be discharged. They are both It c...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01B17/90C01D5/00
CPCY02P20/129
Inventor 晏定生张德怀
Owner HUBEI SHENGHUA RENEWABLE ENERGY DEV
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