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Treatment method of fluoride-containing wastewater

A treatment method and wastewater treatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of incomplete precipitation of fluoride ions, inability to meet industrial needs, and inability to recover hydrogen fluoride and other problems, to achieve the effect of high recovery rate, simple operation and high product purity

Inactive Publication Date: 2014-07-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If silicon oxide or aluminum oxide is used, sodium hexafluorosilicate or sodium fluoroaluminate (CN101948378A; CN202107647U) is produced. Due to the large solubility product of sodium hexafluorosilicate and sodium fluoroaluminate (10 -4 ), the fluoride ion precipitation is not complete, resulting in a high fluorine content in the final product, and hydrogen fluoride cannot be recovered, which cannot meet the industrial needs

Method used

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  • Treatment method of fluoride-containing wastewater

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Effect test

Embodiment 1

[0018] refer to figure 1 , the present invention utilizes the wastewater treatment rectification system to treat fluorine-containing wastewater by means of batch rectification; the wastewater treatment rectification system includes a rectification kettle 1, a packed rectification tower 3, a condenser 4 and a liquid reservoir 5. The rectification kettle 1 is provided with a waste liquid inlet 2, a solvent inlet 7 and a waste liquid outlet 8, and the top of the packed rectification tower 3 is provided with a gas outlet 9 and a reflux liquid inlet 10, and the inside of the packed rectification tower is Φ3×3mm Graphite Raschig rings are used as fillers, and the condenser 4 is provided with an air inlet 11 and a condensate outlet 12, and the liquid reservoir 4 is provided with a liquid inlet 13, a liquid outlet 6 and a reflux outlet 14; The top of the still still communicates with the bottom of the packed rectifying tower, the gas outlet 9 of the packed rectifying tower communicate...

Embodiment 2

[0021] 50g containing 30wt% trifluoroacetic acid, industrial waste water of 10wt% hydrogen fluoride is added in the rectification still from the waste liquid inlet of rectification still, add the water-absorbing solvent 200g that reuses is collected at the waste liquid outlet in embodiment 1 again from solvent inlet and SO 3 140g (recycled water-absorbing solvent and SO 3 , mixed well before adding to the tower kettle), stirred at 25°C and 0.110MPa for 30min until the water was completely absorbed, opened the condenser and heated the rectification kettle to 70°C and pressure of 0.110MPa under the condition of total reflux , continuously adjust the reflux ratio to control the top temperature of the packed rectification tower at 19-23°C and the pressure at 0.100MPa, and collect hydrogen fluoride from the gas outlet, and stop collecting when the top temperature of the packed rectification tower is higher than 23°C. Then gradually increase the heat load of the rectification kettl...

Embodiment 3

[0023]Equipment and operation are the same as embodiment 1. 50g of industrial wastewater containing 32wt% trifluoroacetic acid and 12wt% hydrogen fluoride was added to the rectifying still. Add 460g containing 30wt%SO 3 oleum, stirred and reacted at 20°C and 0.110MPa for 50min until the water was completely absorbed. Open the condenser and heat the rectification tank under the condition of total reflux. The temperature of the rectification tank is 75°C and the pressure of the tank is 0.110MPa. Stop collecting when the temperature at the top of the distillation tower is higher than 23°C. Gradually increase the heat load of the rectification column to 115°C and 0.115MPa, adjust the reflux ratio to control the top temperature of the packed rectification tower at 72-73°C, and the pressure to 0.100MPa, collect trifluoroacetic acid from the gas outlet, and use it as the packing rectification Stop collecting when the temperature at the top of the tower is higher than 73°C. Finall...

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Abstract

The invention discloses a treatment method of fluoride-containing wastewater, the fluoride-containing wastewater is treated by a wastewater treatment distillation system, the wastewater treatment distillation system includes a distillation kettle, a filling rectifying tower, a condenser and a liquid reservoir, and the method is as follows: the fluoride-containing wastewater is led in from a wastewater inlet of the distillation kettle, at the same time a water absorption solvent is led in from a solvent inlet, hydrogen fluoride is collected from a gas outlet, and when the tower top temperature of the filling rectifying tower is higher than the hydrogen fluoride collecting temperature, the collecting is stopped; the distillation kettle temperature is gradually increased to 80-150 DEG C, under the pressure of 0.110-0.120MPa, trifluoroacetic acid is collected from the gas outlet, and when the tower top temperature of the filling rectifying tower is higher than the trifluoroacetic acid collecting temperature, the collecting is stopped; the treatment method is good in separation effect, the product purity is high, the hydrogen fluoride recovery rate is up to 98.6%, the product purity can reach 99.9%, the trifluoroacetic acid recovery rate can reach 99.0%, the product purity is up to 99.8%, no three wastes is produced, and concentrated acids produced in the treatment process are reusable.

Description

(1) Technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method containing hydrogen fluoride and trifluoroacetic acid. (2) Background technology [0002] Trifluoroacetic acid is widely used in industry. Trifluoroacetic acid (TFA) and its derivatives, including anhydrides, esters, peracids, etc., are very useful reagents in organic chemistry and biochemistry. 3 In addition to the basic raw material of the structure, it is also used as a catalyst and a solvent. Due to its lower nucleophilicity and -CF 3 Due to the chemical inertness of the base, trifluoroacetic acid is an excellent solvent for fluorination, nitration and halogenation reactions. The use of trifluoroacetic acid as a catalyst is beneficial to many reactions, such as the alkylation and acylation of aromatic compounds, the polymerization and telomerization of olefins, and the Beckmann rearrangement from oxime to amide. Dilute solutions of hydroge...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C53/18C07C51/44C01B7/19C02F1/58C02F101/14
Inventor 魏作君
Owner ZHEJIANG UNIV
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