6379-46-0Relevant academic research and scientific papers
Dicationic benzimidazole corrosion inhibitor and preparation method thereof
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Paragraph 0029-0033, (2021/06/02)
The invention discloses a dicationic benzimidazole corrosion inhibitor and a preparation method thereof. The preparation method comprises the following steps of: (1) carrying out acylation and cyclization reactions on 1, 2, 4, 5-tetraaminobenzene and thiophane-2-carboxylic acid-1, 1-dioxide to obtain a benzimidazole derivative; and (2) reacting the benzimidazole derivative with halogenated alkane to obtain the dicationic benzimidazole corrosion inhibitor. The corrosion inhibitor has a dicationic structure, so that the corrosion inhibitor has good solubility and strong adhesive force on a metal surface. In addition, the corrosion inhibitor has a plurality of alkane straight chains, and the hydrophobic end can directionally enter a corrosive medium, so that a hydrophobic layer is formed to repel the corrosive medium, and the corrosion inhibitor can be used as a corrosion inhibitor for carbon steel and copper and has a good corrosion inhibition effect.
Quinolyl benzimidazole corrosion inhibitor and preparation method thereof
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Paragraph 0032-0034, (2021/05/29)
The invention discloses a quinolyl benzimidazole corrosion inhibitor and a preparation method thereof.The preparation method comprises the steps that 1) carrying out cylation and cyclization reaction on 1,2,4,5-tetraaminobenzene and quinoline-4-carboxylic acid to obtain quinolyl benzimidazole; 2) carrying out chain extension on the quinolyl benzimidazole and tetramethylene diamine, and then carrying out quaternization reaction to obtain the quinolyl benzimidazole corrosion inhibitor. The corrosion inhibitor has high cation density and good solubility, nitrogen atoms and aromatic rings form conjugated pi bonds, and the adhesion force on the metal surface is high. In addition, the corrosion inhibitor has a plurality of alkane straight chains, and the hydrophobic end can directionally enter a corrosive medium, so that a hydrophobic layer is formed to repel the corrosive medium, and the corrosion inhibitor can be used as a corrosion inhibitor for carbon steel and copper and has a good corrosion inhibition effect.
Conjugated benzimidazole corrosion inhibitor and preparation method thereof
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Paragraph 0034-0036, (2021/04/21)
The invention discloses a conjugated benzimidazole corrosion inhibitor and a preparation method thereof, the preparation method is as follows: 1) 1, 2, 4, 5-tetraminobenzene, o-phenylenediamine and 3, 5-pyridine dicarboxylic acid are subjected to acylation and cyclization reactions to obtain pyridine- benzimidazole; 2) reacting pyridine- benzimidazole with methyl iodide under an alkaline condition to replace the 1H position of benzimidazole; and 3) carrying out quaternization reaction to obtain the conjugated benzimidazole corrosion inhibitor. The conjugated benzimidazole corrosion inhibitor provided by the invention is high in conjugation degree of molecules, can form a large pi bond to be adsorbed on a metal surface in a planar configuration, is strong in adhesive force, greatly improves the corrosion inhibition rate, can be used as a copper and iron corrosion inhibitor, and has a good corrosion inhibition effect.
1,2,3-trichloro-4,6-dinitrobenzene preparation method
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Paragraph 0017; 0019; 0021-0025, (2020/03/25)
The invention relates to a 1,2,3-trichloro-4,6-dinitrobenzene preparation method, wherein 1,2,3-trichloro-4,6-dinitrobenzene is prepared by using a two-step process. The method comprises the followingsteps: mixing 1,2,3-trichlorobenzene and 95-98.5% concentrated sulfuric acid, adding nitric acid in a dropwise manner, carrying out a reaction, separating the organic phase generated by the reactionfrom nitrified waste acid, then adding concentrated sulfuric acid into the organic phase, adding nitric acid in a dropwise manner, carrying out a dinitration reaction, and taking the waste acid separated by the dinitration reaction as the acid for next batch of primary nitrification. 1,2,3-trichloro-4,6-dinitrobenzene is prepared by adopting a two-step method, so that the sulfuric acid raw material required in a preparation process can be reduced while the amount of the waste acid generated in the nitrification process can be reduced.
Method for preparing 4,6-diaminoresorcinol hydrochloride
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Paragraph 0015; 0026; 0027; 0029; 0030, (2020/07/03)
The invention discloses a method for preparing 4,6-diaminoresorcinol hydrochloride and belongs to the technical field of preparation of high polymer materials. The method adopts a tubular reactor to carry out continuous reaction, which not only can guaran
Synthesizing method and application of 1,2,4,5-tetraamine benzene
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Paragraph 0030-0031, (2018/07/30)
The invention discloses a synthesizing method and application of 1,2,4,5-tetraamine benzene. The synthesizing method comprises the following steps: preparing a chlorobenzene byproduct which is 1,2,3-trichlorobenzene as a raw material; nitrifying to obtain 4,6-binitro-1,2,3-trichlorobenzene; further performing ammonolysis in an organic solvent A to obtain 4,6-binitro-2-chlorine-1,3-phenylenediamine; dissolving an ammonolysis product into an organic solvent B; performing catalytic hydrogenolysis to obtain 1,2,4,5-tetraamine benzene. Compared with the prior art, the method has the advantages thatthe chlorobenzene byproduct which is 1,2,3-trichlorobenzene is utilized, and moreover, nitroreduction and halogen hydrogenolysis are integrated during the hydrogenolysis process, thereby facilitatingindustrial production, and providing raw material support to development of downstream products. The application is that 1,2,4,5-tetraamine benzene is used as the raw material and polymerized with 2,5-dihydroxy terephthalic acid to obtain PDBI resin which is an engineering fiber material being high in spinnability and high in modulus.
Electrophilic Aromatic Substitution. Part 35. Chlorination of 1,3-Dinitrobenzene, 1-Chloro-2,4-dinitrobenzene, and 2,4-Dinitrotoluene with Nitric Acid and Hydrogen Chloride or Chlorine in Sulphuric Acid or Oleum
Melhuish, Martin W.,Moodie, Roy B.
, p. 667 - 674 (2007/10/02)
Solutions of sulphuric acid or oleum containing HCl or Cl2 and nitric acid have been found both to chlorinate and nitrate deactivated aromatic compounds.The kinetics and products of the chlorination of 1,3-dinitrobenzene and 1-chloro-2,4-dinitrobenzene in sulphuric acid or oleum containing HCl and nitric acid at 130 deg C, and the kinetics and products of the chlorination of 2,4-dinitrotoluene at 90 deg C in sulphuric acid or oleum containing Cl2 and nitric acid, are reported. 1,3-Dinitrobenzene and 1-chloro-2,4-dinitrobenzene were predominantly chlorinated. 2,4-Dinitrotoluene gave approximately equal amounts of 6-chloro-2,4-dinitrotoluene and 2,4,6-trinitrotoluene.The results show that under these conditions, chlorination and nitration are competing electrophilic reactions, and that chlorination is less selective than nitration.Possible mechanisms for chlorination are discussed.
Electrophilic Aromatic Substitution. Part 33. Kinetics and Products of Aromatic Nitrations in Solutions of Dinitrogen Pentaoxide in Nitric Acid
Moodie, Roy B.,Stephens, R. John
, p. 1059 - 1064 (2007/10/02)
The kinetics and/or products of reaction, in nitric acid containing 0-5 mol dm-3 of dinitrogen pentaoxide, of phenyltrimethylammonium perchlorate, 1,2-dichloro-4-nitrobenzene, 2,4-dinitrotoluene, 1,4-dichloro-2-nitrobenzene, 1,2,4-trichloro-5-nitrobenzene, 1,2,4,5-tetrachlorobenzene, pentachlorobenzene, 1,2,3-trichlorobenzene, 1,3,5-trichloro-2-nitrobenzene, 1,2-dichloro-3-nitrobenzene, 1,2,3,4-tetrachlorobenzene, and 1,3-dichloro-2-nitrobenzene, have been studied.For each substrate investigated kinetically, rate coefficients for nitration in solutions containing more than ca. 2 mol dm-3 dinitrogen pentaoxide increase more quickly than the concentration of nitronium ion.In the cases of 1,2,4,5-tetrachlorobenzene, 1,4-dichloro-2-nitrobenzene, and 1,2,4-trichloro-5-nitrobenzene, but not with the other substrates, there was evidence for the formation of, in addition to expected aromatic nitroproducts, unstable cyclohexadiene products.Those from 1,2,4-trichloro-5-nitrobenzene were identified as a diastereomeric pair of 3,5,6-trichloro-2,4-dinitrocyclohexa-2,5-dienyl nitrates.A mechanism for the formation of these products is proposed.
