74 results about "4-Nitroaniline" patented technology

The present invention is directed to a transparent pigmentary composition for use as a colorant in printing inks. The composition is manufactured by coupling a mixture of diazonium salts obtained from about 98 to about 85% in moles of 2-methoxy-4-nitroaniline and about 2 to about 15% in moles of 4-chloro-2-nitroaniline with acetylaceto-2-anisidide.

A disclosed method of preparing p-phenylenediamine includes the steps of: reacting urea and nitrobenzene with a base in the presence of a polar solvent to yield 4-nitrosoaniline and 4-nitroaniline; and subsequently, diluting the resulting mixed solution in an alcohol and performing hydrogenation using a catalyst, thereby providing highly pure p-phenylenediamine destitute of an ortho- or meta-isomer as a byproduct. The method has some advantages in that: the process is simplified in such a manner that the hydrogenation is performed in the presence of the hydrogenation catalyst in a single reactor (i.e., one pot) without a need of isolating 4-nitrosoaniline or purifying the product; inexpensive urea and an alkali base are used to reduce the production cost; and 4-nitrosoaniline is formed as an intermediate to yield p-phenylenediamine with a high selectivity, thereby requiring no purification process after isolation of the product.

The invention relates to a chitin deacetylase, and an expression gene and an application thereof The amino acid sequence of chitin deacetylase BcCDA is represented by SEQ ID NO.2; and the nucleotide sequence of the BcCDA expression gene is represented by SEQ ID NO.1. An engineering strain constructed by using the gene can efficiently secrete and express the chitin deacetylase BcCDA. A recombinant protein with biological activity is obtained after affinity chromatography one-step purification, and the recombinant protein can degrade solid plate generated yellow green 4-nitroaniline with 4-nitroacetanilide as a substrate. Cloning of the chitin deacetylase gene and the successful preparation of the recombinant protein with biological activity are of great theoretic and practical significance to deep development and high value utilization of the chitin resource.

The invention relates to a synthetic method of 2,6-dibromo-4-nitroaniline diazosalt, solving the technical problems of simplified technique and operation, low requirement for production field and equipment, and energy consumption and 'three wastes' reduction. The invention comprises the following steps: using paranitroaniline as a raw material, pulping in sulphuric acid medium at the mass percentof 20% to 98%, adding brominated compound and oxidant for bromination, and directly diazotizing the mixture with the diazotizd agent after bromination to obtain product, wherein the molar ratio of paranitroaniline, sulphuric acid, brominated compound, oxidant and diazotized agent is 1:2.0 to 8.0:1.0 to 2.5:0.4 to 2.5:1.0 to 1.2.

The invention relates to a preparation method of o-chloro-p-nitroaniline, which takes p-nitroaniline as a raw material, and prepares the o-chloro-p-nitroaniline by directly inputting chlorine gas for implementing the chlorination reaction in a diluted hydrochloric acid medium with a temperature of between -20 and 10 DEG C, wherein, the p-nitroaniline and the input chlorine gas are present in a molar ratio of 1:1-1.1. The preparation method can prepare the o-chloro-p-nitroaniline with best quality, and has advantages of simple process, high yield, low production cost and non wastewater discharge.

The invention discloses a preparation method of 2-methyl-4-nitrophenylamine, which sequentially comprises the following steps of: (1) protecting acylation amino group by using ortho-toludiene as a raw material and using acetic acid as an acylation agent; (2) carrying out nitrification reaction on the reaction liquid obtained in the step (1) by using concentrated nitric acid as a nitrifying agent to obtain a nitrified solid; (3) carrying out hydrolysis reaction on the nitrified solid by using concentrated hydrochloric acid as a hydrolysis reagent; and (4) regulating the pH of the reaction liquid obtained in the step (3) to1-2, and filtering and recrystallizing an obtained filter cake to obtain the 2-methyl-4-nitrophenylamine. The 2-methyl-4-nitrophenylamine prepared by using the method has the characteristics of concise process and low cost.

The invention relates to an organic amine desulfurizer for cyclically absorbing and removing SO2 from flue gas. The organic amine desulfurizer comprises an absorbent and a solvent, wherein the absorbent is a water-soluble organic amine compound with the boiling point higher than 120 DEG C; the organic amine compound is selected from one of pyridylamine, N,N-dimethylacetamide, N,N-dimethyl-p-phenylenediamine, butyrolactam, polyacrylamide, hexamethylene tetramine, 2-aminoacetamide, 2-hydroxy-4-nitroaniline, or phenylenediamine, and also comprises an antioxidant, a corrosion inhibitor and an activator. The invention also relates to a regeneration application of the organic amine desulfurizer. The organic amine desulfurizer has a wide material resource; a processing method is simple; the organic amine desulfurizer disclosed by the invention has an efficient and high-specificity absorption capacity on sulfur dioxide when the organic amine desulfurizer is used for desulfurization; the influence of carbon dioxide in late-period sulphur dioxide recycle is eliminated; the recovery purity of the sulfur dioxide is improved. The desulfurizer can be recycled; the recycling and the low-energy-consumption regeneration of the desulfurizer are realized; the desulfurization cost is reduced; the desulfurization efficiency is improved.

The invention relates to a method for preparing 3-chlorine-5-bromophenol. In the method, 2-chlorine-4-nitroaniline is used as the raw material; and the 3-chlorine-5-bromophenol is prepared according to the following process. In the preparation method, the raw material has low price and is easily obtained; the reaction steps are simple; the reaction condition is mild; the reaction yield is high; the post treatment is simple and is easy to operate; and the product has high content.

The invention provides a green synthetic method of 2,5-diaminotoluene shown as the formula (II). The method comprises the following steps: taking 2-methyl-4-nitroaniline as raw material, magnetic Mg/Al-hydrotalcite solid alkali as catalyst and hydrazine hydrate as reducing agent, reacting at the temperature of 0-100 DEG C for 1-20 hours, and separating and purifying the reaction solution to prepare the 2,5-diaminotoluene. Compared with the prior art, the green synthetic method has the beneficial effects that: the magnetic Mg/Al-hydrotalcite solid alkali taken as catalyst and the hydrazine hydrate taken as reducing agent are applied in the synthesis of the 2,5-diaminotoluene, so that compared with the prior art, the preparation of the 2,5-diaminotoluene is simpler in processing, easy in operation, high in reaction yield, and good in product purity, has no pollution to environment, is suitable for industrialized production with a certain scale, is a green and clean synthetic line, and has no application report of industrialized production at present.

The invention belongs to the technical field of functional materials and discloses a soluble graphene nanoribbon as well as a synthetic method and an application thereof. The synthetic method comprises the steps that 2,6-dibromo-4-nitroaniline and alkyl/alkoxy arylboronic acid have a Suzuki coupling reaction, 2,6-bis(4-alkyl/alkoxy benzene)-4-nitroaniline is obtained and reduced, 2,6-bis(4-alkyl/alkoxy benzene)-1,4-phenylenediamine is obtained and has halogenation, 2,6-bis(4-alkyl/alkoxy benzene)-1,4-dibromo/iodobenzene is obtained and has an Miyaura borylation reaction, and 2,6-bis(4-alkyl/alkoxy benzene)-4-boronic acid pinacol ester-1-bromo/iodobenzene is obtained; then a poly-para-phenylene derivative is generated through the Suzuki coupling reaction, and a product is obtained through oxidative dehydrogenation. The soluble graphene nanoribbon can be applied to the fields of field effect transistors, photovoltaic cells, non-linear optics and sensing.

The invention belongs to the technical field of synthesis of 2, 6-dibromo-4-nitroaniline and bromine, and particularly relates to a co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine. The method includes the following steps: (1) reacting paranitroaniline with bromine in a hydrochloric acid medium at 40 DEG C-50 DEG C to generate 2, 6-dibromo-4-nitroaniline and hydrobromic acid, and reacting chlorine gas with hydrobromic acid to generate hydrochloric acid; (2) adding hydrochloric acid generated in the step (1) into brine, subjecting brine to acidification, blowout, absorption, distillation and condensation, and enabling brine to enter a bromine water separator for separation to prepare bromine; and (3) adding bromine obtained in the step (2) dropwise into a reaction kettle in the step (1) to prepare 2, 6-dibromo-4-nitroaniline. The device comprises a bromine producing unit and a 2, 6-dibromo-4-nitroaniline producing unit communicated with the bromine producing unit. The co-production method and device save the raw material cost and simplify the production technology.

The invention relates to a new synthesis method of an important biochemical reagent L-leucine-4-nitroaniline hydrochloride. The method includes: under the action of sodium hydroxide, reacting an L-Leu-OH solution with BOC anhydride to obtain Boc-L-Leu-OH; subjecting the Boc-L-Leu-OH and a pyridine solution of p-nitroaniline to condensation under the action of phosphorus oxychloride so as to generate the key intermediate Boc-L-Leu-pNA, with the condensation method being novel and not reported in the literature; and reacting a glacial acetic acid solution of the Boc-L-Leu-pNA with a hydrogen chloride gas so as to generate Boc-L-leucine-4-nitroaniline hydrochloride. The method has the advantages of easily available starting raw materials, short reaction steps, convenient operation, high yield, and low cost.

The invention provides a detection method for 2-methyl-4-nitroaniline in waste water, belonging to the technical field of analytical chemistry. According to the method, a one-dimensional metal-organic framework coordination polymer {[Pb(asba)(obix)].2H2O}n is synthesized by using a solution method at first; the method is simple; and the prepared coordination polymer has a better crystal structure and high in purity. A crystal material with a periodic network structure is formed through molecule self-assembling of metal salts and organic ligand, inherits the advantages of inorganic and organic matters and can be applied to a detection environment based on a fluorescence quenching mechanism, especially to detection of a toxic pollutant 2-methyl-4-nitroaniline in waste water.

A preparation process of 3-chloro-5-nitrotoluene is provided in mild conditions. It is a process for preparing 3-chloro-5-nitrotoluene, which comprises reacting 2-methyl-4-nitroaniline with a chlorinating agent such as 5-butyl hypochlorite in a neutral condition to obtain 2-chloro-4-nitro-6-methylaniline and deaminating the 2-chloro-4-nitro-6-methylaniline to obtain 3-chloro-5-nitrotoluene.