118-96-7

Basic information

• Product Name: 2,4,6-Trinitrotoluene
• Synonyms: Toluene,2,4,6-trinitro- (7CI,8CI);1-Methyl-2,4,6-trinitrobenzene;2-Methyl-1,3,5-trinitrobenzene;4-Methyl-1,3,5-trinitrobenzene;Gradetol;NSC 36949;TNT;Trinitrotoluene;Tritol(explosive);Trotyl;Trotyl oil;sym-Trinitrotoluene;sym-Trinitrotoluol;a-TNT
• CAS NO: 118-96-7
• Molecular Formula: C₇H₅N₃O₆
• Molecular Weight: 227.15
• EINECS: 204-289-6
• Mol File: 118-96-7.mol
• Article Data: 20

Chemical Properties

• Boiling Point: 339.227 °C at 760 mmHg
• Flash Point: 167.109 °C
• Appearance: yellow crystals
• Density: 1.608 g/cm³
• Vapor Pressure: 1.49E-06mmHg at 25°C
• Refractive Index: 1.655
• CAS DataBase Reference: 2,4,6-Trinitrotoluene(CAS DataBase Reference)
• NIST Chemistry Reference: 2,4,6-Trinitrotoluene(118-96-7)
• EPA Substance Registry System: 2,4,6-Trinitrotoluene(118-96-7)

Safety Data

• Hazardous Substances Data: 118-96-7(Hazardous Substances Data)

Usage

InChI:InChI=1/C6H3N3O6/c10-7(11)4-2-1-3-5(8(12)13)6(4)9(14)15/h1-3H

Synthetic route

1-methyl-4-nitrobenzene (99-99-0) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid at 110℃; for 4h; Temperature;	92.2%
With sulfuric acid; nitric acid at 20 - 100℃; Nitration;	89%
With sulfuric acid; nitric acid 1.) 0 deg C, 10 min, 2.) 95 deg C, 6 h, then room temp., 12 h;	69%

1-methyl-2-nitrobenzene (88-72-2) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid at 110℃; for 4h;	92.2%
With sulfuric acid; nitric acid
durch Nitrierung;

toluene (108-88-3) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid at 20 - 90℃; Nitration;	84%
With nitric acid; Petroleum ether azeotropes Abdestillieren des gebildeten Wassers;
With sulfuric acid; nitric acid

2,4-dinitrotoluene (121-14-2) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid 1.) 90-100 deg C, 2 h, 2.) 25 deg C, overnight;	62%
Nitrierung;
durch Nitrierung;

1,3,5-trinitrobenzene (99-35-4) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With lead(IV) acetate; acetic acid

4-methylisopropylbenzene (99-87-6) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid at 60 - 70℃;

2,6-dinitrotoluene (606-20-2) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sulfuric acid; nitric acid at 93 - 103℃;
With ammonium nitrate In sulfuric acid at 0 - 25℃;

2,4,6-trinitrophenylacetic acid (77601-83-3) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With water
With ethanol

meta-dinitrobenzene (99-65-0) + lead(IV) tetraacetate (546-67-8) + acetic acid (64-19-7) → 2,4,6-Trinitrotoluene (118-96-7) + 2,4-dimethyl-1,3,5-trinitrobenzene (632-92-8)

Conditions	Yield
Erwaermen des Reaktionsprodukts mit rauchender Salpetersaeure und konz. H2SO4 auf 75-120grad;

1,3,5-trinitrobenzene (99-35-4) + lead(IV) tetraacetate (546-67-8) + acetic acid (64-19-7) → 2,4,6-Trinitrotoluene (118-96-7) + 2,4-dimethyl-1,3,5-trinitrobenzene (632-92-8)

2,4-dinitrotoluene (121-14-2) → 2,4,6-Trinitrotoluene (118-96-7) + carbon monoxide (201230-82-2)

Conditions	Yield
With sulfuric acid; nitric acid Thermodynamic data; ΔH, E(a);

2,4-dinitrotoluene (121-14-2) → 2,4,6-Trinitrotoluene (118-96-7) + 1-bromo-2-methyl-3,5-dinitrobenzene (18242-38-1)

Conditions	Yield
With sulfuric acid; bromine; nitric acid at 90℃; for 0.166667h; Title compound not separated from byproducts;	A 0.4 % Chromat. B 94.7 % Chromat.

2,4-dinitrotoluene (121-14-2) → 2,4,6-Trinitrotoluene (118-96-7) + 1-bromo-2-methyl-3,5-dinitrobenzene (18242-38-1) + 1-chloro-2-methyl-3,5-dinitrobenzene (96-90-2)

Conditions	Yield
With sulfuric acid; nitric acid; chlorine at 90℃; for 0.8h; Rate constant; Mechanism; Product distribution; further reaction times; oleum instead of sulphuric acid;	A 19.1 % Chromat. B 8.8 % Chromat. C 52.3 % Chromat.

C12H11N4O8(1-) → 2,4,6-Trinitrotoluene (118-96-7) + ethyl cyanoacetate anion (31124-95-5)

Conditions	Yield
With sodium methylate In methanol at 25℃; Equilibrium constant; Rate constant;

C12H12N3O10(1-) → bis-methoxycarbonyl-methanide (33673-07-3) + 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sodium methylate In methanol at 25℃; Equilibrium constant; Rate constant;

C16H10N5O6(1-) → 2,4,6-Trinitrotoluene (118-96-7) + p-cyano-phenyl-acetonitrile anion (64764-41-6)

Conditions	Yield
With sodium methylate In methanol at 25℃; Equilibrium constant; Rate constant;

C16H10N5O6(1-) → 2,4,6-Trinitrotoluene (118-96-7) + 2-cyanobenzyl cyanide anion (163977-20-6)

Conditions	Yield
With sodium methylate In methanol at 25℃; Equilibrium constant; Rate constant;

C15H10N5O8(1-) → 2,4,6-Trinitrotoluene (118-96-7) + 4-nitrobenzyl cyanide anion (48129-94-8)

Conditions	Yield
With sodium methylate In methanol at 25℃; Equilibrium constant; Rate constant;

C10H13N4O6(1-) → 2,4,6-Trinitrotoluene (118-96-7) + isopropylamine (75-31-0)

Conditions	Yield
With Isopropylamine hydroperchlorate In dimethyl sulfoxide at 25℃; Equilibrium constant;

C11H15N4O6(1-) → 2,4,6-Trinitrotoluene (118-96-7) + N-butylamine (109-73-9)

Conditions	Yield
With n-butylammonium perchlorate In dimethyl sulfoxide at 25℃; Equilibrium constant;

C7H5N3O9S(2-) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With sodium sulfite In water at 25℃; Equilibrium constant; variation with solvent composition;

C12H15N4O6(1-) → piperidine (110-89-4) + 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
With piperidine hydrochloride In dimethyl sulfoxide at 25℃; Equilibrium constant;

C14H13N4O6(1-) → 2,4,6-Trinitrotoluene (118-96-7) + benzylamine (100-46-9)

Conditions	Yield
With benzylamine hydrogenperchlorate In dimethyl sulfoxide at 25℃; Equilibrium constant;

C9H16N2*C7H4N3O6(1-)*H(1+) → 2,4,6-Trinitrotoluene (118-96-7) + 1,8-diazabicyclo[5.4.0]undec-7-ene (6674-22-2)

Conditions	Yield
In acetonitrile at 25℃; Rate constant; different solvents;

C8H8N3O7(1-)*Na(1+) → 2,4,6-Trinitrotoluene (118-96-7) + sodium methylate (124-41-4)

Conditions	Yield
In methanol; dimethyl sulfoxide at 25℃; Rate constant; Equilibrium constant;

6-methyl-5-(2,4,6-trinitro-benzyl)-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline + acetic acid (64-19-7) → 2,4,6-Trinitrotoluene (118-96-7) + hydrastinine acetate

nitric acid (7697-37-2) + toluene (108-88-3) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
unter azeotropem Abdestillieren des entstehenden Wassers;
in der Waerme bei groesserer Konzentration der Salpetersaeure;
unter azeotropem Abdestillieren des entstehenden Wassers;

sulfuric acid (7664-93-9) + nitric acid (7697-37-2) + toluene (108-88-3) → 2,4,6-Trinitrotoluene (118-96-7)

Conditions	Yield
in der Waerme;

4-methylisopropylbenzene (99-87-6) + sulfuric acid (7664-93-9) + nitric acid (7697-37-2) → 2,4,6-Trinitrotoluene (118-96-7) + 3,5-dinitro-p-toluic acid (16533-71-4)

Conditions	Yield
at 60 - 70℃;

2,4,6-Trinitrotoluene (118-96-7) + terephthalaldehyde, (623-27-8) → 1,4-bis(2,4,6-trinitrostyryl)benzene

Conditions	Yield
With piperidine In benzene for 12h; Knoevenagel Condensation; Dean-Stark; Reflux;	95.1%

2,4,6-Trinitrotoluene (118-96-7) → 1-nitromethyl-2,4,6-trinitrobenzene (35113-75-8)

Conditions	Yield
With potassium hydroxide; fluorotrinitromethane In tetrahydrofuran; methanol; water for 0.0333333h; Nitration;	95%

2,4,6-Trinitrotoluene (118-96-7) → C7H17N3*3ClH

Conditions	Yield
Stage #1: 2,4,6-Trinitrotoluene With hydrogen; pyrographite In methanol at 120℃; under 45004.5 Torr; for 5h; Large scale; Stage #2: With hydrogenchloride In water for 1h; Reagent/catalyst; Solvent; Pressure; Large scale;	95%

2,4,6-Trinitrotoluene (118-96-7) + 2,4,6-trinitrobenzaldehyde (606-34-8) → 2,2’,4,4’,6,6’-hexanitrostilbene (20062-22-0)

Conditions	Yield
With piperidine In toluene Reflux;	94.2%

2,4,6-Trinitrotoluene (118-96-7) → 2,4,6-triaminotoluene hydrochloride

Conditions	Yield
Stage #1: 2,4,6-Trinitrotoluene With hydrogen In toluene at 120℃; under 30003 Torr; for 10h; Autoclave; Stage #2: With hydrogenchloride In water for 0.5h; Solvent; Pressure; Temperature;	93.1%

2,4,6-Trinitrotoluene (118-96-7) + benzene-1,3,5-trialdehyde (3163-76-6) → 1,3,5-tris(2,4,6-trinitrostyryl)benzene

Conditions	Yield
With piperidine In benzene for 14h; Knoevenagel Condensation; Dean-Stark; Reflux;	90.3%

2,4,6-Trinitrotoluene (118-96-7) + 4-methyl-benzaldehyde (104-87-0) → 1,3,5-trinitro-2-[2-(4-methylphenyl)ethenyl]benzene

Conditions	Yield
With piperidine In benzene for 6h; Knoevenagel Condensation; Dean-Stark; Reflux;	90.2%

3-methylisoquinoline (1125-80-0) + 2,4,6-Trinitrotoluene (118-96-7) + benzoyl chloride (98-88-4) → [3-Methyl-1-(2,4,6-trinitro-benzyl)-1H-isoquinolin-2-yl]-phenyl-methanone (94170-03-3)

Conditions	Yield
In chloroform at 60 - 70℃; for 1h;	90%

2,4,6-Trinitrotoluene (118-96-7) → 2,4,6-triaminotoluene trihydrochloride (634-87-7)

Conditions	Yield
With hydrogenchloride; palladium on activated charcoal; hydrogen In methanol at 20℃; under 18751.9 Torr; for 2h; Solvent; Pressure; Time;	90%
With iron(III) chloride; pyrographite; hydrazine hydrate In methanol for 7h; Heating;	67.8%

2,4,6-Trinitrotoluene (118-96-7) + 3-formyl-4,6-dinitro-1-phenyl-1H-indazole (544676-41-7) → 1-(4,6-dinitro-1-phenyl-1H-indazol-3-yl)-2-(2,4,6-trinitrophenyl)ethanol

Conditions	Yield
With potassium carbonate In ethanol at 20℃; for 24h;	90%

2,4,6-Trinitrotoluene (118-96-7) + N,N-dimethyl-formamide dimethyl acetal (4637-24-5) → β-N,N-dimethylamino-2,4,6-trinitrostyrene

Conditions	Yield
	90%
In toluene at 20℃; for 24h;	70%

Isophthalaldehyde (626-19-7) + 2,4,6-Trinitrotoluene (118-96-7) → 1,3-bis(2,4,6-trinitrostyryl)benzene

Conditions	Yield
With piperidine In benzene for 11h; Knoevenagel Condensation; Dean-Stark; Reflux;	89.5%

2,4,6-Trinitrotoluene (118-96-7) → 2,4,6-trinitrobenzoic acid (129-66-8)

Conditions	Yield
With sodium chlorate; nitric acid	88%
With sodium dichromate; sulfuric acid at 45 - 55℃; for 2h; Oxidation;	14%
With sodium chlorate; nitric acid Reinigung ueber das Natrium-Salz;

2,4,6-Trinitrotoluene (118-96-7) + benzaldehyde (100-52-7) → 1,3,5-trinitro-2-[(E)-2-phenylvinyl]benzene (61599-68-6)

Conditions	Yield
With piperidine; silica gel In neat (no solvent) at 120℃; for 0.333333h; Microwave irradiation;	88%
With piperidine In benzene for 6h; Condensation; Heating;	81%
With HTc-4-Cal In toluene for 15h; Reagent/catalyst; Time; Reflux; Dean-Stark;	70%
With piperidine
With piperidine; ethanol at 40℃;

2,4,6-Trinitrotoluene (118-96-7) + Methyl thioglycolate (2365-48-2) → 2,4-dinitro-6-[(methoxycarbonyl)methylthio]toluene (321596-17-2) + (4-methyl-3,5-dinitro-phenylsulfanyl)-acetic acid methyl ester

Conditions	Yield
With potassium carbonate In 1-methyl-pyrrolidin-2-one at 20℃; for 24h;	A 88% B n/a

2,4,6-Trinitrotoluene (118-96-7) + 4-chlorobenzaldehyde (104-88-1) → 2-[(E)-2-(4-Chloro-phenyl)-vinyl]-1,3,5-trinitro-benzene (65200-05-7)

Conditions	Yield
With piperidine In benzene for 5.5h; Knoevenagel Condensation; Dean-Stark; Reflux;	87.6%

2,4,6-Trinitrotoluene (118-96-7) + 2-chloro-benzaldehyde (89-98-5) → C14H8ClN3O6

Conditions	Yield
With piperidine In benzene for 6h; Knoevenagel Condensation; Dean-Stark; Reflux;	87%

Ethyl 2-mercaptopropionate (19788-49-9) + 2,4,6-Trinitrotoluene (118-96-7) → 2-(2-methyl-3,5-dinitro-phenylsulfanyl)-propionic acid ethyl ester + 2-(4-methyl-3,5-dinitro-phenylsulfanyl)-propionic acid ethyl ester

Conditions	Yield
With potassium carbonate In 1-methyl-pyrrolidin-2-one at 20℃; for 24h;	A 86% B n/a

2,4,6-Trinitrotoluene (118-96-7) → 2,4,6-trinitro(α,αα-D3)toluene (52886-05-2)

Conditions	Yield
With tributyl-amine; water-d2 In N,N-dimethyl-formamide for 5h;	85%
With [(2)H6]acetone; deuteromethanol; water-d2; triethylamine for 1.5h; Ambient temperature;	63%

2,4,6-Trinitrotoluene (118-96-7) + ethane-1,2-dithiol (540-63-6) → 1,2-bis((2-methyl-3,5-dinitrophenyl)thio)ethane (1608182-18-8)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 20℃; for 2h;	85%

2,4,6-Trinitrotoluene (118-96-7) + ethyl 2-sulfanylacetate (623-51-8) → (2-methyl-3,5-dinitro-phenylsulfanyl)-acetic acid ethyl ester (367925-03-9)

Conditions	Yield
With alkaline resin In acetone at 50℃; for 20h; Large scale;	85%

2,4,6-Trinitrotoluene (118-96-7) + 4-methoxy-benzaldehyde (123-11-5) → 2-[(E)-2-(4-methoxyphenyl)vinyl]-1,3,5-trinitrobenzene (61599-69-7)

Conditions	Yield
With HTc-4-Cal In toluene for 24h; Knoevenagel Condensation; Reflux; Dean-Stark;	83%
With piperidine In benzene for 6h; Condensation; Heating;	60%
With piperidine

2,4,6-Trinitrotoluene (118-96-7) + 3-Chlorobenzaldehyde (587-04-2) → trans-3′-chloro-2,4,6-trinitrostilbene

Conditions	Yield
With piperidine; silica gel In neat (no solvent) at 120℃; for 0.333333h; Microwave irradiation;	83%
With HTc-4-Cal In toluene for 24h; Knoevenagel Condensation; Reflux; Dean-Stark;	71%

1-thiopropane (107-03-9) + 2,4,6-Trinitrotoluene (118-96-7) → (2-methyl-3,5-dinitrophenyl)(propyl)sulfane (1608182-14-4)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 20℃; for 2h;	83%

2,4,6-Trinitrotoluene (118-96-7) + phenylmethanethiol (100-53-8) → (2-methyl-5-nitro-1,3-phenylene)bis(benzylsulfane)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 20℃;	83%

2,4,6-Trinitrotoluene (118-96-7) + 4-methyl-benzaldehyde (104-87-0) → trans-4′-methyl-2,4,6-trinitrostilbene

Conditions	Yield
With piperidine; silica gel In neat (no solvent) at 120℃; for 0.333333h; Microwave irradiation;	82%
With piperazine at 80 - 90℃;

2,4,6-Trinitrotoluene (118-96-7) + 4-chlorobenzaldehyde (104-88-1) → trans-4′-chloro-2,4,6-trinitrostilbene (61599-70-0)

Conditions	Yield
With piperidine; silica gel In neat (no solvent) at 120℃; for 0.333333h; Microwave irradiation;	82%
With HTc-4-Cal In toluene for 24h; Knoevenagel Condensation; Reflux; Dean-Stark;	70%
With piperidine at 120℃;

Upstream product

• 99-35-4 1,3,5-trinitrobenzene 
• 88-72-2 1-methyl-2-nitrobenzene 
• 99-65-0 meta-dinitrobenzene 
• 546-67-8 lead(IV) tetraacetate 
• 64-19-7 acetic acid 
• 108-88-3 toluene 
• 121-14-2 2,4-dinitrotoluene 
• 7697-37-2 nitric acid 
• 7664-93-9 sulfuric acid 
• 99-87-6 4-methylisopropylbenzene 
• 7732-18-5 water 
• 64-17-5 ethanol 
• 77601-83-3 2,4,6-trinitrophenylacetic acid 
• 212267-63-5 3-methyl-2,4,6-trinitro-benzoic acid 

Downstream Products

• 6307-92-2 2,4,6-trinitro-stilbene 
• 61599-69-7 2-[(E)-2-(4-methoxyphenyl)vinyl]-1,3,5-trinitrobenzene 
• 632-92-8 2,4-dimethyl-1,3,5-trinitrobenzene 
• 92378-81-9 2-(1-nitromethyl-2-picryl-ethyl)-furan 
• 108-73-6 3,5-dihydroxyphenol 
• 58293-58-6 9-ethyl-3-(2,4,6-trinitro-trans-styryl)-carbazole 
• 61599-68-6 1,3,5-trinitro-2-[(E)-2-phenylvinyl]benzene 
• 92160-87-7 2'.4'.6'-trinitro-3-oxy-stilbene 
• 97062-87-8 1-nitro-2-phenyl-3-(2,4,6-trinitro-phenyl)-propane 

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Relevant articles and documents

Synthesis of 2,4,6-trinitrotoluene (TNT) using flow chemistry

This paper describes the nitration of 2,4-dinitrotoluene (DNT) and its conversion to 2,4,6-trinitrotoluene (TNT) at a gram scale with the use of a fully automated flow chemistry system. The conversion of DNT to TNT traditionally requires the use of highly hazardous reagents like fuming sulfuric acid (oleum), fuming nitric acid (90-100%), and elevated temperatures. Flow chemistry offers advantages compared to conventional syntheses including a high degree of safety and simpler multistep automation. The configuration and development of this automated process based on a commercially available flow chemistry system is described. A high conversion rate (>99%) was achieved. Unlike established synthetic methods, ordinary nitrating mixture (65% HNO3/98% H2SO4) and shorter reaction times (10-30 min) were applied. The viability of flow nitration as a means of safe and continuous synthesis of TNT was investigated. The method was optimized using an experimental design approach, and the resulting process is safer, faster, and more efficient than previously reported TNT synthesis procedures. We compared the flow chemistry and batch approaches, including a provisional cost calculation for laboratory-scale production (a thorough economic analysis is, however, beyond the scope of this article). The method is considered fit for purpose for the safe production of high-purity explosives standards at a gram scale, which are used to verify that the performance of explosive trace detection equipment complies with EU regulatory requirements.

Photocatalytic degradation of trinitrotoluene and other nitroaromatic compounds

The photocatalytic degradation of 2,4,6-trinitrotoluene and ten other nitroaromatic compounds in aerated TiO2 suspensions has been studied. The following order of reactivity was observed: nitrotoluenes > nitrobenzene > dinitrotoluenes > dinitrobenzenes > 2,4,6-trinitrotoluene > 1,3,5-trinitrobenzene, which reflects the known influence of nitro groups towards the attack of electrophilic reagents on the aromatic molecule.

The Stabilities of Meisenheimer Complexes. Part 21. Sulphite Additions to 2,4,6-Trinitrotoluene and 2,4,6-Trinitrobenzyl Chloride

In aqueous sodium sulphite solutions, 2,4,6-trinitrotoluene and 2,4,6-trinitrobenzyl chloride give 1:1 and 1:2 adducts by addition at unsubstituted ring positions.Rate and equilibrium data for these reactions have been obtained by the stopped-flow method and are compared with similar data for other nitro-compounds.

Application of [PVI-SO3H]NO3as a novel polymeric nitrating agent with ionic tags in preparation of high-energetic materials

In this paper, poly(vinyl imidazole) sulfonic acid nitrate [PVI-SO3H]NO3was synthesized and fully characterized. Then, [PVI-SO3H]NO3was applied for the preparation of energetic materials such as 1,1-diamino-2,2-dinitroethene (FOX-7), pentaerythritol tetranitrate (PETN), 1,3,5-trinitro-1,3,5-triazinane (RDX) and trinitrotoluene (TNT). The major advantages of the presented methodology are mild, facile workup, high yields and short reaction times. [PVI-SO3H]NO3is a suitable nitrating agent forin situgeneration of NO2and without using any co-catalysts of the described nitrating reagent.

Method for preparing TNT (Trinitrotoluene) by taking nitrotoluene as raw material through one-step method

The invention discloses a method for preparing TNT (Trinitrotoluene) by taking nitrotoluene as a raw material through a one-step method. According to the method disclosed by the invention, p-nitrotoluene or o-nitrotoluene is used as the raw material and a mixed system of fuming HNO3/concentrated H2SO4 is used as a nitrating agent, and 2,4,6-trinitrotoluene TNT is prepared through one-step nitrification reaction; the 2,4,6-trinitrotoluene TNT is subjected to structure characterization by adopting a melting point, thin-layer chromatography, mass spectrometry and liquid chromatography. Influences, caused by a ratio, a feeding manner and a dosage of the mixed system of the fuming HNO3/concentrated H2SO4, to the yield of a product are explored and reaction conditions are optimized. The TNT is synthesized by taking the nitrotoluene as the raw material through one-step nitrification, so that environment pollution caused by the fact that a lot of waste acid and red water are generated is avoided, and energy source and power consumption caused by reaction steps and nitrification equipment are reduced.