436 results about "Nitrobenzoic acid" patented technology

The invention discloses a water-based cleaning agent, which comprises the following components in percentage by mass: 1 to 3 percent of sodium tripolyphosphate, 2 to 4 percent of disodium hydrogen phosphate, 0.5 to 1 percent of borax, 2 to 4 percent of nitrobenzoic acid, 0.5 to 2 percent of sodium hydroxide, 1 to 4 percent of surfactant, 2 to 5 percent of polyethylene glycol, 13 to 15 percent of triethanolamine, 0.01 to 0.1 percent of defoamer and the balance of water. The water-based cleaning agent is high in cleaning capacity of greasy dirt, avoids generating a large amount of foam in the cleaning process, is suitable for full-automatic cleaning and ultrasonic cleaning, has the good protective effect on cleaning machines, does not contain inflammable and explosive ingredients, is used safely, does not have influence on human bodies and does not pollution on environment.

The invention relates to a synthesis method and application of a novel high-selectivity and high-sensitivity near infrared fluorescence probe for visually detecting hydrogen polysulfide. The method comprises the steps of making benzopyran carbonitrile and p-hydroxy benzaldehyde react to obtain a precursor, and then conducting an esterification reaction with 2-fluoro-5-nitrobenzoic acid to obtain the fluorescence probe. The probe reacts with sodium polysulfide to generate a strengthened fluorescence change, which is that the fluorescence at the 682 nm is strengthened remarkably. Besides, a dynamic experiment result shows that the reaction time of the compound and hydrogen polysulfide is shorter than 5 min, and the interference rejection is strong. Thus, the pyran carbonitrile compound can serve as the application of the near infrared fluorescence probe for detecting hydrogen polysulfide.

The method for producing m-dimethylaminobenzoic acid includes the following steps: in the presence of catalyst and methyl alcohol solvent making raw material m-nitrobenzoic acid and hydrogen gas produce reduction reaction to obtain intermediate product, making said intermediate product continuously implement ankylation reaction with formaldehyde to obtain crude product, making said crude product undergo the processes of filtering, washing and purification so as to obtain the invented product m-dimethylaminobenzoic acid. Its catalyst uses active carbon as carrier, and its effective component is selected from palladium, platinum, rhodium or their mixture and selected from iron, cobalt, nickel, copper zinc or their mixture. Said catalyst is long in service life, and the methyl alcohol can berecovered for reuse.

The invention discloses an environment-friendly chemical nickel stripper and a deplating method thereof. Preferably, m-nitrobenzoic acid serves as an oxidizing agent for stripping a nickel-plated layer on an iron substrate; and since nitrate is generally stable in nature and low in toxicity, no waste gas or waste water is generated when the stripper provided by the invention is used, and the stripper does not corrode devices and has high affinity with the environment. Meanwhile, the stripper is further matched with diethyl dithiocarbamate and dodecyl sulfonate and combined with the deplating method thereof, the rate of stripping the nickel-plated layer on the iron substrate can be effectively increased, the nickel-plated layer can be stripped in a short time, and the production period is shortened. Compared with the prior art, the environment-friendly chemical nickel striper and the deplating method thereof have the advantages of being free of corrosion, poison gas and pollution, high in efficiency, environmentally friendly, easy and convenient to maintain and operate and the like.

The invention discloses a method for synthesizing 3-methyl-4-nitrobenzoic acid by using a stepped heating method and an indirect electrosynthesis method. The method is implemented by taking 2,4-dimethylnitrobenzene and chromium sulfate as main raw materials through the following steps of: firstly, carrying out electrolytic oxidation on chromium sulfate by using an electrolytic process so as to obtain chromium trioxide; then, selectively oxidizing 2,4-dimethylnitrobenzene into a 3-methyl-4-nitrobenzoic acid by using chromium trioxide through using the stepped heating method. According to the invention, through adopting the stepped heating method, the oxidation reaction rate of 2,4-dimethylnitrobenzene is controlled, and the selectivity and conversion rate of reaction are remarkably improved. The conversion rate of chromium trioxide obtained by using an electrolytic oxidation method is 85-95%, and the conversion rate of 3-methyl-4-nitrobenzoic acid obtained by using the stepped heating method can reach 65-86%. According to the invention, the problem that in the process of reaction, the reaction rate declines due to the consumption of acids is solved; through carrying out electrolytic oxidation on chromium sulfate produced after reaction, chromium trioxide is circularly produced, thereby not only avoiding the environment pollution, but also greatly saving the cost.

The invention relates to an electroreduction preparation method of a 2-amino-4-methoxybenzoic acid derivative represented by a formula I, wherein the preparation reaction is defined in the specification, n is selected from 1, 2 and 3, X is selected from CO2H, CO2Me, CO2Et, CO2Bn, CONH2 and CN, Bn is benzyl, Y is selected from HO, Cl, Br, MsO, TsO and a group defined in the specification, M is selected from CH and N, and W is selected from CH2, O, S, NH, HOCH, MeN and EtN. The electroreduction preparation method is characterized in that in a diaphragm electrolytic cell, an acidic solution of a4-methoxy-2-nitrobenzoic acid derivative or a mixed solution of an inorganic ammonium salt, an organic solvent and water is used as a cathode electrolytic solution; relative to a reference electrode,the voltage of a cathode working electrode is 1.00-2.50 V; an anode electrolytic solution is an acidic solution, constant-current or constant-voltage electrolysis is carried out, the current density of the constant current is 20.0-250.0 mA / cm<2>, and the electrolysis temperature is 20-80 DEG C.

The invention discloses a Niraparib synthesis method. The method comprises that through esterification, 3-methyl hydroformylation, 3-schiff base reaction, cyclization, amidation, BOC removal and chiral resolution, optically pure Niraparib with purity of 91% or more is prepared from 3-methyl-2-nitrobenzoic acid. The method has the advantages of simple process, high efficiency, easy operation and less equipment requirement, and is a method suitable for industrial production.

Dispersions of graphenic carbon particles are produced using a polymeric dispersant. The polymeric dispersant includes an anchor block comprising glycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl(meth)acrylate, 2-(3,4-epoxycyclohexyl)ethyl(meth)acrylate, allyl glycidyl ether and mixtures thereof, reacted with a carboxylic acid comprising 3-hydroxy-2-naphthoic acid, para-nitrobenzoic acid, hexanoic acid, 2-ethyl hexanoic acid, decanoic acid and / or undecanoic acid. The polymeric dispersant also includes at least one tail block comprising at least one (meth)acrylic acid alkyl ester.

The invention relates to a preparation method of 3, 5-diaminobenzoic acid, which is characterized in that: the 3, 5-dinitrobenzoic acid is taken as raw material, carbinol or ethanol as a solvent, and added with a catalyst; a reduction reaction is carried out between the 3, 5-dinitrobenzoic and hydrogen of theoretical reacting weight for 2-10 hours under the reaction pressure of 0.1 MPa to 5MPa as well as the reaction temperature of 20 DEG C to 150 DEG C, thereby obtaining crude product; the crude product is separated and removed off the solvent to obtain the 3, 5-diaminobenzoic acid product, wherein, the dosage ratio of materials is calculated on the basis of 1mol of 3, 5-dinitrobenzoic acid, the dosage of the carbinol or ethanol is 200ml to 1000ml, and the dosage of the catalyst is 0.5 percent to 10 percent of the weight of the 3, 5-dinitrobenzoic acid; the catalyst is either Raney nickel or an active carbon carrier. The method has short technological line, product purity up to 95 percent and yield rate over 96 percent and causes no 'three wastes' (waste gas, waste water and waste residues) pollution and the catalyst can be recovered for later use.