Process for treating alkaline wastewater generated in production of polynitrotoluene and device thereof

A treatment process, nitrotoluene technology, applied in water/sewage treatment, water treatment parameter control, heating water/sewage treatment, etc., can solve the problems of inability to re-use, inconsistent indicators, high production costs, and reduce production and operation. cost, improve security, and ensure the effect of stability

Pending Publication Date: 2021-09-07
HUBEI DONGFANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the direct incineration method is that after the alkaline wastewater is atomized and burned with natural gas, a large amount of incompletely burned nitrates are entrained in the tail gas, and nitrogen oxides, sulfur dioxide, and dust are seriously exceeding the standard, polluting the environment, failing to meet environmental protection requirements, and have been eliminated.
Direct biochemical treatment does not eliminate most polynitrotoluenes and does not improve the toxicity of wastewater
The actual operation is difficult, and the wastewater discharge is difficult to meet the standard
[0005] 3. Incineration + electrostatic dust removal + desulfurization and denitrification treatment method: troublesome operation, unstable operation, need to adjust desulfurization and denitrification according to the exhaust gas data after dust removal, consume more ammonia water, catalyst, hydrogen peroxide, and high production cost
[0007] Existing problems: polynitrotoluene (mononitrotoluene and trinitrotoluene) alkaline wastewater has different water quality, inconsistent salinity, nitrate content, COD and other indicators, and large changes in incineration tail gas pollutants (nitrogen oxides, sulfur dioxide) , often unqualified; the alkaline wastewater enters the incinerator, the water quality is uncontrollable, and the natural gas consumption is large during the incineration process; the alkaline wastewater water quality is uncontrollable, and the purity of the incineration residue and electrostatic precipitator supplementary dust is inconsistent, so it cannot be reused

Method used

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  • Process for treating alkaline wastewater generated in production of polynitrotoluene and device thereof
  • Process for treating alkaline wastewater generated in production of polynitrotoluene and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The polynitrotoluene wastewater is fed according to the volume ratio of mononitrotoluene and trinitrotoluene at 1:4, the concentration conditions are vacuum degree -65kPa, evaporation at 85°C, and the concentrated wastewater feed rate is 600kg / h. The volume flow rate is 250m 3 / h, control the oxygen flow rate to ensure that the combustion coefficient is 0.78, enter the incinerator 3 and burn at 950-1150°C, and then go through the electrostatic precipitator 7 to remove dust.

Embodiment 2

[0054] The polynitrotoluene wastewater is fed according to the volume ratio of mononitrotoluene and trinitrotoluene at 1:1, the concentration conditions are vacuum degree -73kPa, evaporation at 75°C, and the concentrated wastewater feed rate is 1000kg / h. The volume flow rate is 315m 3 / h, control the oxygen flow rate to ensure that the combustion coefficient is 0.8, enter the incinerator 3 and burn at 950-1150°C, and then go through the electrostatic precipitator 7 to remove dust.

Embodiment 3

[0056] The polynitrotoluene wastewater is fed according to the volume ratio of mononitrotoluene and trinitrotoluene at 4:1, the concentration conditions are vacuum degree -95kPa, evaporation at 40°C, and the concentrated wastewater feed rate is 1500kg / h. The volume flow rate is 350m 3 / h, control the oxygen flow rate to ensure that the combustion coefficient is 0.85, enter the incinerator 3 and burn at 950-1150 ° C, and then go through the electrostatic precipitator 7 to remove dust.

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Abstract

The invention discloses a process for treating alkaline wastewater generated in production of polynitrotoluene and a device thereof, and the production process comprises the following steps: evaporating mononitrotoluene alkaline wastewater and trinitrotoluene alkaline wastewater according to a ratio of (0.25-4): 1 under a reduced pressure heating condition, increasing the COD of the wastewater to 200000-240000 mg/L, mixing the wastewater with natural gas under an oxygen-deficient condition, and carrying out low-nitrogen incineration, wherein the incineration flue gas reaches the emission standard after being dedusted. The process is stable in incineration operation, stable and qualified in emission index, free of SNCR, SCR, dangerous chemicals and catalysts, low in operation cost and high in safety degree.

Description

technical field [0001] The invention relates to the technical field of chemical wastewater treatment, in particular to a polynitrotoluene production alkaline wastewater treatment process and device. Background technique [0002] In the production process of polynitrotoluene, a kind of alkaline wastewater (high concentration alkali metal salt wastewater) commonly known as "red water" is produced. Common treatment methods for polynitrotoluene alkaline wastewater are: [0003] 1. Direct incineration method. The problem with the direct incineration method is that after the alkaline wastewater is atomized and burned with natural gas, a large amount of incompletely burned nitrates are entrained in the tail gas, and nitrogen oxides, sulfur dioxide, and dust are seriously exceeding the standard, polluting the environment, failing to meet environmental protection requirements, and have been eliminated. . [0004] 2. Direct biochemical treatment. Direct biochemical treatment canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04F23G7/04B03C3/00B03C3/34C02F101/34C02F101/38C02F101/30
CPCC02F1/048C02F1/043F23G7/04B03C3/00B03C3/34C02F2101/38C02F2101/34C02F2209/08F23G2201/10F23G2201/70C02F2101/30
Inventor 李敏王景奇汤运祥石国辉严巧容侯云辉高晓东周树亮陈云常福祥
Owner HUBEI DONGFANG CHEM IND
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