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Phenylhydrazine hydrochloride production waste liquid treatment method and application thereof

A technology for phenylhydrazine hydrochloride and waste liquid treatment, applied in multi-stage water treatment, water/sewage treatment, natural water treatment and other directions, can solve problems such as environmental pollution and resource waste, improve economic benefits, avoid emissions, and save production The effect of raw materials

Inactive Publication Date: 2018-05-29
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing phenylhydrazine waste liquid is discharged after simple alkali neutralization, causing serious environmental pollution and waste of resources.

Method used

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  • Phenylhydrazine hydrochloride production waste liquid treatment method and application thereof

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Embodiment

[0040] A kind of phenylhydrazine hydrochloride production waste liquid processing method, process step comprises:

[0041] 1) Transfer the waste liquid from the production of phenylhydrazine hydrochloride to the reaction kettle, add liquid ammonia while stirring at room temperature for neutralization reaction, until the pH value of the waste liquid reaches 9.5, stop adding liquid ammonia, and continue stirring for 20 minutes.

[0042] The neutralization reaction equation is:

[0043] Ar-NH-NH 2 ·HCl+NH 3 →Ar-NH-NH 2 +NH 4 Cl

[0044] HCl+NH 3 →NH 4 Cl

[0045] NH 4 HSO 4 +NH 3 →(NH 4 ) 2 SO 4

[0046] NH 4 HSO 3 +NH 3 →(NH 4 )2 SO 3 .

[0047] 2) The neutralized solution is transported to the extraction tower for extraction treatment, the flow rate of the solution and ethylbenzene extractant entering the extraction tower is controlled, and the extraction temperature is controlled within the range of 20°C to 25°C, so that the extraction operation can be carr...

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Abstract

The invention discloses a phenylhydrazine hydrochloride waste liquid treatment method and an application thereof, and relates to the field of sewage treatment. The method comprises the process steps:1) mixing a phenylhydrazine hydrochloride production waste liquid with an alkaline agent, neutralizing phenylhydrazine hydrochloride in the waste liquid under an alkaline condition to produce phenyl hydrazine; 2) with an organic solvent as an extractant, carrying out extraction separation of the waste liquid after neutralization, to obtain an extraction phase and an extraction residual phase; 3) mixing the extraction phase with concentrated hydrochloric acid, carrying out reverse extraction, and separating to obtain phenylhydrazine hydrochloride and a liquid extractant, making the extractant return to the step 2, and circulating; and 4) heating and concentrating the extraction residual phase, then carrying out cooling crystallization, and separating to obtain a salt and condensate water. The method has the advantages of high treatment rate, effective recycling of resources, waste utilization, good circulation of materials, and 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 white or pink and flaky crystal, sensitive to light and humidity, and capable of sublimation. It is easily soluble in water, and its water solubility is 50g / L at 20°C. It is soluble in ethanol, but almost insoluble in ether. It will precipitate out of the solution when concentrated hydrochloric acid is added. Phenylhydrazine hydrochloride has a melting point of about 250°C and is widely used in the production of organic intermediates in the dye, pharmaceutical and pesticide industries. [0003] The used raw materials of existing phenylhydrazine hydrochloride production are aniline, hydrochloric acid, sodium nitrite, ammonium bisulfite and ammoniacal liquor. Phenylhydrazine hydrochloride is prepared from aniline through diazot...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/34
CPCC02F1/04C02F1/043C02F1/26C02F9/00C02F2103/34C02F2301/08
Inventor 刘西德李萌周迪
Owner QUFU NORMAL UNIV
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