Method for extracting 3-nitryl-4--hydroxyphenylarsonic acid from waste water

A technology for hydroxyphenylarsine acid and waste water, applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems such as excessive solid precipitation and cost increase, and achieve low energy consumption , low raw material input, low equipment investment effect

Active Publication Date: 2012-04-11
ZHEJIANG RONGYAO CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing treatment method of wastewater containing 3-nitro-4-hydroxyphenylarsine is: adding FeCl to wastewater 2 , hydrogen peroxide, CaO, etc., so that the 3-nitro-4-hydroxyphenylarsinic acid in the wastewater becomes solid precipitation and separated from the water phase. The disadvantage is that too much solid precipitation occurs, and the solid precipitation needs to be stacked separately and further subsequent treatment. increase the cost

Method used

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  • Method for extracting 3-nitryl-4--hydroxyphenylarsonic acid from waste water
  • Method for extracting 3-nitryl-4--hydroxyphenylarsonic acid from waste water
  • Method for extracting 3-nitryl-4--hydroxyphenylarsonic acid from waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Add 100mL of waste water containing roxarsone (ROX%=1.18%, pH=2.5), 50mL of butyl acetate, and 100mL of tert-butylamine into a 250mL Erlenmeyer flask in sequence, stir for 5min, and transfer to 250mL liquid separation at a temperature of 25°C Let stand in the funnel for 15min to obtain a water layer (lower layer), an organic solvent layer (butyl acetate layer, upper layer) and an extractant layer (tert-butylamine layer, middle layer), and analyze the water layer by HPLC, and the result ROX%=0.20 %, the removal rate is 83.0%; the primary water layer discharges up to the standard.

Embodiment 2

[0045] (1) Add 100mL of waste water containing roxarsone (ROX%=1.18%, pH=2.5), n-octanol 10mL, and trioctylamine 2.5mL into a 250mL Erlenmeyer flask successively, stir for 5min, and turn the temperature to 30°C. Put into a 250mL separatory funnel and let stand for 15min to obtain a water layer (lower layer), an organic solvent layer (n-octanol layer, upper layer) and an extractant layer (trioctylamine layer, middle layer), and analyze the water layer by HPLC , result: ROX%=0.072%, removal rate 93.9%.

[0046] (2) Add 4mL industrial saturated concentrated hydrochloric acid to 97mL primary water layer to adjust pH=0.5, the total volume is 101mL, pour it into a 250mL Erlenmeyer flask, add 50.5mL n-octanol, add 101mL trioctylamine, stir for 5min, temperature 30 ℃, transfer to a 250mL separatory funnel and let stand for 15min to obtain a secondary water layer (lower layer), a secondary organic solvent layer (n-octanol layer, upper layer) and a secondary extractant layer (trioctylam...

Embodiment 3

[0048] (1) Add 400mL of waste water containing roxarsone (ROX%=0.6%, pH=2.5), 40mL of n-hexane, and 20mL of cyclohexylamine into a 500mL Erlenmeyer flask in turn, stir for 5min, and transfer to a 500mL portion at a temperature of 25°C. Let stand in the liquid funnel for 15min to obtain a water layer (lower layer), an organic solvent layer (n-hexane layer, upper layer) and an extractant layer (cyclohexylamine layer, middle layer), and analyze the water layer by HPLC, the result: ROX %=0.055%, removal rate 90.8%.

[0049] (2) Add 4 mL of industrial saturated concentrated hydrochloric acid to the 390 mL primary water layer to adjust the pH to 0.5. The total volume is 394 mL, pour it into a 500 mL conical flask, add 40 mL of n-hexane, add 20 mL of cyclohexylamine, stir for 5 min, and the temperature is 25 ° C. Transfer to a 500mL separatory funnel and let stand for 15min to obtain a secondary water layer (lower layer), a secondary organic solvent layer (n-hexane layer, upper layer...

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Abstract

The invention discloses a method for extracting 3-nitryl-4--hydroxyphenylarsonic acid from waste water comprising Roxarsone: the waste water comprising Roxarsone is mixed with an organic solvent A for extracting under 25-75 DEG C under the effect of an extracting agent A to obtain a primary water course, a primary organic solvent course and a primary extracting agent course. The primary extracting agent course is added into aqueous alkali A and water A and stirred to adjust a pH value to 8-14 and then stewed for delamination to obtain a final water course and a final extracting agent course; the pH value of the final water course is adjusted to 0.5-2 and then the final water course is crystallized under 30-75 DEG C, and filtered after the final water course is completely crystallized to obtain filter liquor and filter cake; and the filter cake is dried to obtain the 3-nitryl-4--hydroxyphenylarsonic acid. The method is simple to operate and has less equipment investment and low energy consumption. The solvent and extracting agent used can be recycled and reused and have less loss; therefore, the material input is low. Moreover, not wastes are generated; therefore, the method is clean and environmental friendly.

Description

(1) Technical field [0001] The invention relates to a method for extracting 3-nitro-4-hydroxyphenylarsine from waste water. (2) Background technology [0002] 3-nitro-4-hydroxyphenylarsine (roxarsine) is the most economical organic arsine preparation and a multifunctional preparation. It can be used in conjunction with a variety of antibiotics and growth-promoting agents. It can not only improve the feed conversion rate, promote the growth of livestock and poultry, and promote the pigmentation of livestock, but also improve the curative effect of other anticoccidial drugs on poultry. It is also the best choice for treating swine dysentery and enteritis. The most important thing is that it can improve the laying rate of laying hens. [0003] Roxarsone is poisonous and harmful to humans. The roxarsone contained in the wastewater will pollute the drinking water source of people or animals, and cause serious harm to the surrounding environment. The state strictly prohibits its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/76
Inventor 杨座国陈建华蔺黎陈仁尔
Owner ZHEJIANG RONGYAO CHEM
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