Method for extracting polynitrotoluene from nitrotoluene acid wastewater

A technology of nitrotoluene and acidic wastewater, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as manual cleaning and danger

Active Publication Date: 2019-04-16
HUBEI DONGFANG CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the solid form of dinitrotoluene and its derivatives in the sedimentation tank, manual cleaning is required, and the cleaning operation has certain dangers

Method used

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with specific examples, and the implementation scope of the present invention is not limited thereto.

[0022] The method for extracting polynitrotoluene from nitrotoluene acidic wastewater in this embodiment uses a delivery pump to mix and transport mononitrotoluene, acidic wastewater, mixed nitrates in the collection tank, and refluxed emulsified acidic water to the cooler. Lower the temperature twice to lower the liquid temperature to below 20°C. Acidic wastewater includes high-temperature acidic wastewater and low-temperature acidic wastewater produced by vacuum concentration. Then the liquid is separated once to obtain mixed nitrates and acidic water. The acidic water is obtained through secondary separation. Mix nitrates, clarified acidic water, emulsified acidic water, clarified acidic water flows into the wastewater treatment system for treatment, emulsified acidic water is sent back t...

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Abstract

The invention relates to the technical field of nitrotoluene preparation, in particular to a method for extracting polynitrotoluene from nitrotoluene acid wastewater, mononitrotoluene, acid wastewater, a mixed nitrification in a collection tank and refluent emulsified acidic water are mixed and conveyed to a cooler for two-time cooling by a delivery pump, then the liquid is subjected to primary separation to obtain a mixed nitrification and acidic water, the acidic water is subjected to secondary separation to obtain a mixed nitrification, clear acidic water and emulsified acidic water, the clear acidic water flows to a wastewater treatment system for treatment, the emulsified acidic water flows back to the delivery pump, the primary separation is gravity settling separation, the secondaryseparation is gravity settling separation after filtration, the mixed nitrifications obtained through primary separation and secondary separation are placed into the collection tank, partial nitrification is delivered to the delivery pump, and the other mixed nitrifications are extracted polynitrotoluene products. According to the method for extracting the polynitrotoluene from the nitrotoluene acid wastewater, the content of the nitro-compound in wastewater is reduced, and the method is economic, environment-friendly, safe and convenient.

Description

technical field [0001] The invention relates to the technical field of nitrotoluene preparation, in particular to a method for extracting polynitrotoluene from nitrotoluene acidic wastewater. Background technique [0002] Nitrotoluene is one of the ingredients of commonly used explosives. Explosive companies produce a large amount of acidic wastewater containing nitrotoluene and sulfuric acid in the daily nitration production. The nitrotoluene compounds include mononitrotoluene, dinitrotoluene, and trinitrotoluene. , dinitrotoluene and trinitrotoluene are high in content, and all three are toxic and difficult to biodegrade, so they have certain difficulties in wastewater treatment. [0003] At present, the main domestic nitrotoluene wastewater treatment methods include chlorine dioxide oxidation and catalytic oxidation, micro-electrolysis, oxidation, anaerobic, aerobic biochemical treatment, incineration treatment, and vacuum concentration treatment. Among them, QVF vacuum c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/16C07C205/06
CPCC07C201/16C07C205/06
Inventor 朱学明胡伟梅新成朱习强段川
Owner HUBEI DONGFANG CHEM IND
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