A kind of phenylhydrazine hydrochloride production waste liquid treatment and resource recovery method
A technology for treating phenylhydrazine hydrochloride and waste liquid, applied in filtration treatment, natural water treatment, chemical instruments and methods, etc., can solve problems such as production waste liquid pollution, reduce waste water discharge and organic pollution, save production raw materials, eliminate The effect of secondary pollution
Inactive Publication Date: 2021-07-27
QUFU NORMAL UNIV
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Problems solved by technology
[0005] For the problems existing in the above-mentioned prior art, the object of the present invention is to provide a kind of phenylhydrazine hydrochloride production waste liquid treatment method and application, not only solve the pollution problem of phenylhydrazine hydrochloride production waste liquid, but also can make useful resources recycle, have important The economic value and social benefits of
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Embodiment 1
[0037] A kind of phenylhydrazine hydrochloride production waste liquid treatment and resource recovery method, process step comprises:
[0038] 1) Transport the waste liquid from the production of phenylhydrazine hydrochloride to the reactor, heat it to 60-70°C, feed air to oxidize ammonium bisulfite to ammonium bisulfate, and then add 15wt% milk of lime solution for neutralization reaction, so that ammonia can be fixed Transform and decompose until the pH value of the waste liquid reaches 9.0-9.5, stop adding the milk of lime solution, and continue to stir and react for 30 minutes, so that phenylhydrazine hydrochloride is converted into phenylhydrazine, and ammonium sulfate is converted into calcium sulfate dihydrate. Precipitation is complete (at 60-70 ℃ reaction temperature is conducive to the formation of larger particles of calcium sulfate dihydrate).
[0039] The oxidation and neutralization reaction equations are:
[0040]
[0041] 2HCl+Ca(OH) 2 →CaCl 2 +2H 2 o ...
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Abstract
The invention discloses a method for treating waste liquid produced by phenylhydrazine hydrochloride and recycling resources, and relates to the field of sewage treatment. The process steps include: 1) heating the waste liquid produced by phenylhydrazine hydrochloride and feeding it into air; mixing it with milk of lime solution until The pH value of the waste liquid is alkaline, and the reaction is stirred; 2) after the reaction is completed, filter while it is hot, and separate and remove the precipitate calcium sulfate dihydrate; 3) use the organic solvent as the extraction agent, and carry out continuous extraction and separation of the filtrate to obtain the extract phase and The raffinate phase; 4) The extract phase is mixed with excess concentrated hydrochloric acid for back extraction, and the reaction solution is separated to obtain the extractant, phenylhydrazine hydrochloride and excess hydrochloric acid; 5) The raffinate phase is heated to distill ammonia. Not only the treatment rate is high, resources can be recovered effectively, and waste can be utilized; and the material recycling is good, and there is no secondary pollution.
Description
technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment method and application of phenylhydrazine hydrochloride production waste liquid. Background technique [0002] Phenylhydrazine hydrochloride is a white or pink flaky organic compound. Sensitive to light and moisture. can sublimate. Soluble in water, soluble in ethanol, almost insoluble in ether. Adding concentrated hydrochloric acid precipitates out of solution. It is poisonous with a melting point of 250-254°C, and the minimum lethal dose (rabbit, oral) is 25mg / kg. Carcinogenic potential. Mainly used in the production of organic intermediates of dyes, medicines and pesticides. [0003] The raw materials used in the production of existing phenylhydrazine hydrochloride are aniline, hydrochloric acid, sodium nitrite, ammonium bisulfite and ammonia water, etc. Phenylhydrazine hydrochloride is prepared from aniline through diazotization, reduction, acid precipitatio...
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IPC IPC(8): C02F9/10C07C243/22C07C241/02C02F103/36
CPCC02F1/001C02F1/04C02F1/26C02F1/66C02F1/74C02F9/00C02F2103/36C07C241/02C07C243/22
Inventor 刘西德周迪
Owner QUFU NORMAL UNIV