Treatment process for treating phenylhydrazine hydrochloride wastewater by using macroporous resin

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a treatment process for treating phenylhydrazine hydrochloride wastewater by using macroporous resin. The method comprises the following steps: S1, pretreating: pumping low-temperature raw wastewater sent by a phenylhydrazine hydrochloride workshop raw wastewater pool into a neutralization pool, starting a circulating submerged pump, slowly introducing ammonia gas to neutralize the raw wastewater, opening a valve of an upper column liquid mixing tank when the pH value is 2.0-3.0, injecting the wastewater into the upper column liquid mixing tank, carrying out fine adjustment, sampling from a sampling port of the mixing tank by using a sampler, detecting the pH value of the wastewater by using an acidimeter,slowly injecting ammonia water according to the pH value in order to adjust the pH value to 6.0-6.2, and detecting the COD of the wastewater to 20000mg / L; and S2, adsorbing: adopting a continuous operation process of series adsorption and single-tower desorption, wherein each tower is filled with 12 m<3> NDA-99 macroporous adsorption resin. The treatment process for treating phenylhydrazine hydrochloride wastewater by utilizing the macroporous resin can solve the problems that the existing resin is long in service life, large in total wastewater amount and unfavorable for quality control of phenylhydrazine hydrochloride products.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment process for treating phenylhydrazine hydrochloride wastewater by using a macroporous resin. Background technique [0002] Phenylhydrazine is an intermediate of dyestuffs, medicines, and pesticides. It is used in the production of naphthol AS-G, antipyrine, etc., and is also a commonly used carbonylation reagent. Phenylhydrazine sulfate (or phenylhydrazine hydrochloride) is an intermediate product in the production of phenylhydrazine, and can also be used as a pharmaceutical and pesticide intermediate, such as for the production of benzoconazole. The traditional process of phenylhydrazine production is: using aniline as raw material, diazotization, sodium sulfite addition reduction, acid precipitation to obtain phenylhydrazine sulfate (or hydrochloride), and then alkali hydrolysis to obtain phenylhydrazine. [0003] The production of phenylhydrazine produ...

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Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention provides a treatment process for treating phenylhydrazine hydrochloride wastewater by using macroporous resin, which has the advantages of long service life of the resin, small amount of wastewater, and convenience for quality control of phenylhydrazine hydrochloride products, and solves the current problems. The resin has a long service life and the total amount of waste water is large, which is not conducive to the quality control of phenylhydrazine hydrochloride products

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