Method for extracting o-phenylendiamine from waste water of o-phenylendiamine production

A technology for o-phenylenediamine and production wastewater, which is applied in the purification/separation of amino compounds, organic chemistry and other directions, can solve the problems of large o-phenylenediamine content, poor adsorption performance and high production cost, and achieves high removal rate and good Economic efficiency and good purity
CN1865223AInactive Publication Date: 2006-11-22陈义龙
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
陈义龙
Publication Date
2006-11-22
Estimated Expiration
Not applicable · inactive patent
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Abstract

This invention relates to a method for extracting o-phenylenediamine from waste water of o-phenylenediamine production. Wherein: filtrate the waste water containing o-phenylenediamine, and load it on the absorption column filled with macroreticular resin which absorbs o-phenylenediamine and other organic compounds in the waste water, and then elute with ethanol solution to desorb the o-phenylenediamine and form the desorption solution, distill the desorption solution to remove the ethanol, cool the residual liquid after distillation at controlled temperature to precipitate the o-phenylenediamine crystals, and then obtain the o-phenylenediamine by filtration. This invention is characterized of high clearance of o-phenylenediamine in the waste water, high-purity of recovered o-phenylenediamine, simple and rational process. It accomplishes the object of turning waste to be useful, solves the waste discharging problem, and has a good economical benefit.
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Description

technical field

[0001] The invention relates to wastewater treatment and utilization technology, in particular to a method for extracting o-phenylenediamine from wastewater extracted from o-phenylenediamine production. Background technique

[0002] O-phenylenediamine is an important intermediate of pesticides and dyes. It is mainly prepared from o-nitrochlorobenzene through amination under high temperature and high pressure and reduction with alkali sulfide. Using the above method, 8 to 10 tons of waste water (CODcr is about 100,000 to 120,000 mg / l) will be discharged for every ton of o-phenylenediamine produced, the main components of which are: 0.5 to 1% o-phenylenediamine, 16 ~18%, alkali sulfide 1~2%, etc. O-phenylenediamine production wastewater has a high value of extraction and utilization. At present, the treatment and utilization of this type of wastewater is mainly used as a raw material for the production of soda. However, in the process of using it to produce s...

Claims

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