30 results about "Diphenic acid" patented technology

The invention provides a method for synthesizing 4,4'-diphenic acid. In the method, high-boiling-point polyethylene glycol 400 is used as a solvent, cuprous iodide (CuI) is used as a catalyst, and 4,4'-diphenic acid is obtained in the condition of presence of diethylenediamine and potassium hydroxide (KOH) by a reduction coupling new method. The synthesis method has the advantages that the method for synthesizing 4,4'-diphenic acid is simple, the synthesizing condition requirements are not high, the operation is easy, the production cost is low, the yield is very high, the purity is also very high and the repeatability is good, so that the method is suitable for the requirements of large-scale industrialized production; the solvent polyethylene glycol 400 used by the reaction system has high steam pressure, does not pollute the environment and is environment-friendly; and the purification method is simple, column separation purification is not needed, and purification can be carried out just by a common recrystallization method.

The invention relates to the field of chemical synthesis, and in particular to a synthesis method for 4,4'-biphenyldicarboxylic acid. The synthesis method for 4,4'-biphenyldicarboxylic acid is characterized by comprising the following reaction steps of: step 1, reacting 4-diphenic acid, oxalyl chloride and aluminium trichloride in a molar ratio of 1: (1.1-1.8): (1.2-2.0) to obtain 4,4'-dicarboxylbibenzil, wherein the weight ratio of 4-diphenic acid to a solvent is 1: (3 to 10); and step 2, reacting 4,4'-dicarboxylbibenzil, an oxidant and potassium hydroxide in a molar ratio of 1: (1.2-2.0):(1.4-2.2), and then carrying out recrystallization by absolute methanol to obtain 4,4'-biphenyldicarboxylic acid, wherein the weight ratio of 4,4'-dicarboxylbibenzil to an organic solvent is 1: (3-10). Compared with the prior, the synthesis method for 4,4'-biphenyldicarboxylic acid disclosed by the invention has the beneficial effects of being reasonable and practicable in process flow, high in yield which is up to move than 93%, moderate in process reaction conditions, low in requirements on equipment, and suitable for industrialized production.

The present invention provides a process for the preparation of diphenic acid from phenanthrene which comprises heating phenanthrene and glacial acetic acid, adding dropwise a pre-determined amount of 30 % hydrogen peroxide, heating the resulting mixture after completion of drop wise addition of hydrogen peroxide, distilling the resulting mixture under reduced pressure to make the volume half, cooling the mixture till diphenic acid crystalises out, filtering the cooled mixture and boiling the residue after adding 10 % solution of sodium carbonate and activated charcoal, filtering and discarding the residue; acidifying the filtrate with hydrogen chloride; cooling the resultant mixture till more diphenic acid crystallises out; repeating filtration till pure diphenic acid is obtained.

The invention provides 4-diphenyl formate / LEuH nanometer complex and a synthetic method thereof. The synthetic method comprises the following steps of: a) dissolving EuCl3.6H2O, NaCl and hexamethylenetetramine (HMT) in water, and introducing N2 to perform a hydro-thermal reaction, filtering, washing, and drying to synthesize Eu(OH)2.5Cl0.5.nH2O; and b) adding NaOH into 4-diphenic acid to obtain sodium salt solution of the 4-diphenic acid, dispersing the Eu(OH)2.5Cl0.5.nH2O prepared in the step a) in the sodium salt solution of the 4-diphenic acid to perform the hydro-thermal reaction, and washing and drying, wherein the molar number of the 4-diphenic acid is 3 times that of the Eu(OH)2.5Cl0.5.nH2O. In the synthetic method, 4-diphenyl formate is inserted among LEuH layers to improve the efficiency of energy transfer, the stability of the synthesized 4-diphenyl formate / LEuH nanometer complex is high, and the luminous performance of Eu<3+> is enhanced, so the complex is a lamellate composite material with excellent performance.

The invention discloses an Europium fluorescent probe and test paper based on diphenic acid and application thereof in the detection of p-phenylenediamine, the structural unit of the fluorescent probe is [PMI]2[Eu2(BPDC)3C12], wherein the PMI represents 1-propyl-3-methylimidazole monovalent cation, BPDC represents diphenic acid radical that loses protons on two carboxyl groups; the fluorescent probe belongs to a monoclinic crystal system and the space group is P21 / c. the crystal cell parameters are as follows: alpha is equal to gamma, which is equal to 90 degree, belta is equal to 96.6830(10) degree; and the crystal cell volume of z is equal to 4. The fluorescent probe of the invention has excellent red fluorescence properties and shows bright red under the irradiation of an ultraviolet lamp, the p-phenylenediamine in the aqueous phase has a significant quenching effect on the red fluorescence of the fluorescent probe and test paper, so the fluorescent probe and test paper can be used for detecting p-phenylenediamine with high sensitivity, high selectivity and anti-interference, the fluorescent probe and test paper are disposable (similar to normal pH test paper).

The invention belongs to the technical field of resin production, and particularly relates to a polyester resin for an anti-yellowing HAA (N,N,N',N'-tetra(Beta-hydroxyethyl)adipamide) system and further relates to a preparation method and application of the polyester resin. The anti-yellowing HAA system provided by the invention is polymerized by using pyromellitic dianhydride, 1,6-hexanediamine,isophthalic acid, phloroglucinol formic acid, ethanetricarboxylic acid monoester, 2,5-dihydroxy hexane, neopentyl glycol and 2,2'-diphenic acid. Because a polyimide chain is carried in the molecular chain of the polyester resin obtained by the materials and a specific process, the high temperature-resistant and anti-yellowing properties are excellent; moreover, because the materials containing phenolic hydroxyl groups, such as phloroglucinol formic acid and ethanetricarboxylic acid monoester, are used for participating in reaction and the phenolic functional group with high anti-yellowing capability is contained in the polyester chain, the polyester product has excellent high temperature-resistant and anti-yellowing properties, and is ultimately used in the powder paint of the HAA system,so that a coated panel with excellent anti-yellowing property can be obtained.

The invention discloses a double-layer coextrusion casting film which comprises a PET layer and a PP layer. PP plastic particles comprise PP, trihydroxy polyoxypropylene ether, N,N'-(4,4'-methylene diphenyl)bismaleimide, trimethylolpropane trimethacrylate, 4,4'-dyhydroxyl diphenyl sulfide, montmorillonite, paraffin, antioxidant 1010, nano TiO2, polyether siloxane copolymer, methyl hydroxyethyl cellulose and VTPS silane coupling agent. PET plastic particles comprise terephthalic acid, ethylene glycol, maleic anhydride, 2-nitroterephthalic acid-4-methyl ester, 2,2-dimethyl-1,3-propylene glycol, 2,3-dibromo-2-butene-1,4-glycol, 1,4-benzene dimethanol, 2-aminoterephthalic acid, tetrabromo terephthalic acid, bis(2-ethyl hexyl)terephthalic acid, 4-bromo phthalic anhydride, 2,2-difluoro-1,3-benzodioxole, magnesium fluosilicate and antibacterial agent. By the combining of the PP layer and the PET layer, the whole composite film is high in barrier property, antibacterial and flame-retardant.

The invention provides a method for separating diphenic acid from tower bottom waste for preparing benzoic acid, and in particular relates to a method for extracting mixed diphenic acid from tower bottom waste for preparing benzoic acid by direct liquid phase oxidation of toluene and separating and purifying 3-phenyl benzoic acid and 4-phenyl benzoic acid. Any high-toxicity organic solvent and any catalyst are not used in the reaction process; the purification process is simple in operation; and the toluene serving as an organic solvent in the reaction process and the purification process can be recycled in a rectifying mode, and ethanol serving as an organic solvent can be recycled by rectification after simple treatment. The method further expands the utilization range of the tower bottom waste for preparing the benzoic acid by direct liquid phase oxidation of the toluene, and has the advantages of simplicity and convenience in operation, easiness in separation and purification of the product, low environmental pollution, low cost, high economic value and the like.

This invention relates to a method for producing 4-amyl-biphenylcarboxylic acid-3-fluoro-4-cyanophenol ester, comprising: amyl-biphenylcarboxylic acid, thionyl chloride, 3-fluoro-4-cyanophenol, toluene, sodium-hydroxide, and anhydrous ethyl alcohol as raw material, with mole ration as: amyl-biphenylcarboxylic acid 1.05, thionyl chloride 2.65, 3-fluoro-4-cyanophenol 1, toluene 3, sodium-hydroxide 0.1, and anhydrous ethyl alcohol 4.0. The process comprises two steps: (1) use amyl-biphenylcarboxylic acid and thionyl chloride as raw material for acylation reaction and synthesize amyl-bibenzoyl chloride by normal pressure and decreasing pressure distillation; (2) dropwise add amyl-bibenzoyl chloride and 3-fluoro-4-cyanophenol with toluene as solvent for esterification, and produce the target product 4-amyl-biphenylcarboxylic acid-3-fluoro-4-cyanophenol ester by water washing, alkaline washing, crystallization and recrystallization, wherein the conditions: acylation reaction temperature 160Deg C, reflux time 6h, normal distillation temperature 172-176Deg C, pressure decreasing temperature 118-121Deg C, vacuum 50mmHg, the discharging condition is to collect the 3Deg C range product after temperature and pressure stabilized, the temperature of adding 3-fluoro-4-cyanophenol with agitation for acylation reaction is 100Deg C, keep the temperature between 90 and 100Deg C when dropwise adding amyl-bibenzoyl chloride for 3h, reflux with agitation for 6h, heating steam pressure no more than 0.2MPa, autoclave inside temperature kept at 120+2Deg C, crystallization temperature -15Deg C and kept at -15+-2Deg C for 1h for agitation, recrystallization temperature -15Deg Cand kept at -15+-2Deg C for 1h for agitation.

The invention relates to a biphenyl bisamide compound as well as a preparation method and application thereof. The biphenyl bisamide compound is prepared by reacting 2,2'-diphenic acid anhydride or a derivative thereof with corresponding amines (H2NR1 and H2NR2) respectively. The biphenyl bisamide compound provided by the invention has remarkable insecticidal activity and a selective insecticidal spectrum, is simple in preparation process, and is expected to be developed into a novel pesticide which is low in toxicity, efficient and environment-friendly.