47 results about "N-Methylformamide" patented technology

The invention discloses a method for directly recovering and producing electro deposited cobalt from waste lithium ion cells. The method is mainly characterized in that: firstly, the waste lithium ion cells are disassembled and separated to obtain positive plates; secondly, the positive plates are immersed by an organic solvent N-methylformamide (NMP), and aluminum foils and anode materials of a current collector are separated; thirdly, the anode materials which contain lithium cobaltate are leached out by a hydrochloric acid and hydrogen peroxide system, and undissolved substances are filtered and separated; and fourthly, the electro deposited cobalt is obtained after electrodeposition of filtrate. By adoption of the method, the recovery rate of the cobalt in the waste lithium ion cells can be about 97.0 percent, and the purity of the electro deposited cobalt can be more than 99.8 percent.

The charge generating layer includes a gallium phthalocyanine crystal in which an organic compound (P) is contained, the organic compound (P) is at least one compound selected from the group consisting of dimethylsulfoxide, N,N-dimethylformamide, N-methylformamide, N-propylformamide, N-vinylformamide and N-methylpyrrolidone, the content of the organic compound (P) is 0.1% by mass or more and 1.5% by mass or less based on a gallium phthalocyanine in the gallium phthalocyanine crystal, and the charge transporting layer includes a resin having a siloxane structure, and a compound (Q) having a boiling point of 150° C. or more at 1 atm.

Disclosed is a polyfluoroalkyl alcohol represented by the following general formula: CnF2n+1(CH2CF2)a(CF2CF2)b(CH2CH2)cOR (R: H, a (meth)acrylic acid group; n:1-6; a:1-4; b:1-3; c:1-3), or a (meth)acrylic acid derivative thereof. A polyfluoroalkyl alcohol (R: a hydrogen atom) can be produced by reacting a fluoroalkyl iodide represented by the following general formula: CnF2n+1(CH2CF2)a(CF2CF2)b(CH2CH2)cI with N-methylformamide, and then hydrolyzing the resulting in the presence of an acid catalyst. A (meth)acrylic acid derivative of such a polyfluoroalkyl alcohol (R: a (meth)acrylic acid group) can be produced by reacting a (meth)acrylic acid with the polyfluoroalkyl alcohol.

To provide an electrophotographic photosensitive member that can allow a high-quality image, in which photomemory after repeated use in a high-speed process is suppressed, to be output, as well as a process cartridge and an electrophotographic apparatus including the electrophotographic photosensitive member. An electrophotographic photosensitive member wherein a charge generating layer includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the organic compound is at least one compound selected from the group consisting of dimethylsulfoxide, N,N-dimethylformamide, N-methylformamide, N-propylformamide, N-vinylformamide and N-methylpyrrolidone, the content of the organic compound is 0.1% by mass or more and 2.0% by mass or less based on a gallium phthalocyanine in the gallium phthalocyanine crystal, and a charge transporting layer includes a polycarbonate resin having structural units represented by the following formula (1).

The invention relates to the technical field of waste stripping solution recovery, and provides a process for recovering high-purity N-methyl formamide from a waste stripping solution. The process includes rectifying the waste stripping solution containing N-methyl formamide and diethylene glycol methyl ether to obtain a NMF crude product having a mass concentration of 80-90%; repeating 1-3 timesof melting and crystallization; performing partial melting, melting, melt liquid collection and cooling for crystallization to obtain high-purity NMF. A technique combining melting and crystallizationwith rectification is adopted so that a problem that high-purity NMF cannot be obtained through recovery is solved, and the process has advantages of simple procedures, low investment, short period,a high yield and a low cost. The obtained high-purity NMF is high in purity which can be electronic chemical purity that is 99.99%, thus overcoming a problem that purity of a product of rectificationonly can reach 90%.

Disclosed is a mixture of fluoroalkyl alcohols represented by the general formulae: CF₃(CF₂)_n(CH═CF)_a(CF₂CF₂)_b(CH₂CH₂)_cOH [Ia] and CF₃(CF₂)_n-1(CF═CH)_aCF₂(CF₂CF₂)_b(CH₂CH₂)_cOH [Ib], wherein n is an integer of 1 to 5, a is an integer of 1 to 4, b is an integer of 0 to 3, and c is an integer of 1 to 3. This fluoroalkyl alcohol mixture is produced by the reaction of a fluoroalkyl iodide represented by the general formula: CF₃(CF₂)_n(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cI [II], with N-methylformamide, followed by hydrolysis in the presence of a basic compound.

The invention discloses a composite solvent for recovering CS2 from viscose fiber waste gas by an absorption process. The composite solvent comprises polyethylene glycol dimethyl ether (NHD), N-methylpyrrolidone (NMP) or N,N-methylformamide or ethylene glycol butyl ether or 1,2,4-trimethylbenzene. CS2 in the viscose fiber waste gas is absorbed by the composite solvent to obtain a purified gas andan absorption rich solution, and the rich solution can be recycled after undergoing reduced pressure distillation regeneration. The composite solvent can effectively improve the CS2 dissolving ability, and has a higher solubility and a higher purification rate than the pure NHD solvent when applied to CS2 waste gas recovery; and compared with activated carbon for adsorption treatment of CS2 wastegas, the composite solvent has the advantages of wide application range, low process cost, high operational stability, economical property, environmental protection and long service life.

The invention relates to an industrial separation method of main components N-methylformamide (NMF) and diethylene glycol monomethyl ether (MDG) in an electronic chemical stripper. A low-pressure molecular distillation method is adopted to efficiently recover the NMF and the MDG in the waste electronic chemical stripper, and has the advantages of energy saving and safety and environmental protection. A high-purity NMF and MDG separation refining process mainly comprises the following steps of 1) depressurization and degassing: decompressing and degassing the mixture of the NMF and the MDG to prevent entrainment splashing caused by sudden pressure drop after materials enter a molecular rectification tower; 2) molecular rectification of enabling the degassed materials to enter the molecularrectification tower achieve separation by utilizing the feature that molecular mean free paths of the two components are different. Compared with the conventional process, the method achieves the effect that the the purity of the finished NMF and the finished MDG is over 99%, and the rectified NMF and the rectified MDG reach the purity requirement of the electronic chemical stripper and achieve the separation and the purification of the NMF and the MDG.

An electrophotographic photosensitive member includes a support member, a charge generating layer, and a charge transport layer in that order. The charge generating layer contains a gallium phthalocyanine crystal containing therein at least one amide compound selected from the group consisting of N-methylformamide, N-propylformamide, and N-vinylformamide. The charge transport layer contains fluorine-containing resin particles and a fluorine-containing copolymer.

The invention discloses a reagent for a Karl Fischer volumetric method, a preparation method of the reagent and an application of the reagent. The reagent for the Karl Fischer volumetric method comprises a titrant and a solvent, wherein the titrant comprises iodine, sulfur dioxide, N-methylformamide and imidazole, and the solvent comprises ethylene glycol monomethyl ether, ethyl alcohol and imidazole. The titrant and the solvent in the reagent for the Karl Fischer volumetric method is free from methyl alcohol, the ethyl alcohol and the imidazole are added into a reactive solvent, hydroxy needed by Karl Fischer reaction can be ensured, reaction can be normal, reaction of ethylene sulfate and alcohol can be slowed down, even if slight reactant acid is generated, the reactant acid can be neutralized by a large amount of imidazole in the solvent, the PH (potential of hydrogen) value of volumetric solution is buffered, and side reaction is avoided, so that water titration of the ethylene sulfate is realized.

The invention discloses a preparation method of 2,3,5,6-tetra-substituted symmetric pyridine. Specifically, the symmetric 2,3,5,6-tetra-substituted pyridine is prepared by taking beta-ketonic ester as a reaction substrate, a metal copper compound as a catalyst, a peroxide reagent as an oxidizing agent, inorganic ammonium salt as a nitrogen source and N-methylformamides as an organic solvent (also as a carbon source) and through carbon-hydrogen and carbon-nitrogen removal, dehydration condensation and an oxidation aromatization reaction. The preparation method disclosed by the invention has the characteristics of easily available raw materials, cheap and low-toxic catalyst, high catalytic efficiency, wide substrate range, simple and convenient operation, greenness and environmental friendliness and the like.

The invention discloses a preparation method of an ultraviolet light absorber UV-1. The ultraviolet light absorber UV-1 is prepared by condensation of ethyl p-aminobenzoate and N-methylformanilide inthe presence of thionyl chloride or trifluoromethanesulfonic anhydride. The condensation reaction comprises the following steps: performing a reaction at room temperature for 12-24 hours, heating thereactants to 45-60 DEG C, and performing a reaction for 5-10 hours. The molar ratio of the ethyl p-aminobenzoate to the N-methylformanilide is (1:0.5)-(1:1.5). The molar ratio of thionyl chloride or trifluoromethanesulfonic anhydride to N-methylformamide is 1:1-10:1. According to the method, trimethyl orthoformate/triethyl orthoformate can be prevented from being used as a main raw material, so that the cost for preparing the UV-1 is greatly reduced; thionyl chloride/trifluoromethanesulfonic anhydride is used as a reaction reagent of ethyl p-aminobenzoate and N-methylformyl aniline, so that the method is not only environment-friendly, but also can obtain higher reaction yield and product purity.

The invention relates to a stripping agent containing an alkylamide mixture. The stripping agent containing an alkylamide mixture comprises 50-70wt% of N-methylformamide, 30-50wt% of N,N-dimethylacetamide, and the balance water. The stripping agent containing an alkylamide mixture has water intersolubility, no corrosivity to copper or a copper alloy, and no toxicity to human and the environment. Because the stripping agent containing an alkylamide mixture only comprises the two main ingredients, the used stripping agent can be easily recovered by fractionation and is restructured into an original formula for recycle in the manufacturing process, thus the effects of reducing a cost and protecting the environment are achieved. The invention further provides a method for removing light resistance by the stripping agent containing an alkylamide mixture.

The invention discloses dimethrin microcapsules, a preparation method therefor and an insectproof preparation prepared from the dimethrin microcapsules. The microcapsules comprise capsule shells and capsule cores, wherein the capsule shells are prepared from polydopamine, the capsule cores are prepared from dimethrin, the dimethrin comprises one or more of lambda-cyhalothrin, beta-cyfluthrin, biphenthrin and cis-cypermethrin, and the capsule cores are wrapped in the capsule shells. The preparation method disclosed by the invention comprises the steps: (1) providing hollow polydopamine capsuleshells; and (2) providing a dimethrin solution, and enabling the dimethrin solution to enter the capsule shells to form the capsule cores, wherein N,N-dimethylformamide or N-methylformamide serves asa solvent of the solution. According to the dimethrin microcapsules, the preparation method therefor and the insectproof preparation, the chemical stability and released control of dimethrin pesticides are improved, the effect duration is prolonged, toxic or side effects are lowered, and the bioavailability is improved.

The invention relates to the technical field of water purifying agents, in particular to a preparation method of a cyclodextrin/photocatalyst composite modified carbon-based water purifying agent. Thepreparation method of the cyclodextrin/photocatalyst composite modified carbon-based water purifying agent comprises the following steps: annealing orange peel to obtain porous charcoal powder; sequentially performing a reaction on beta-cyclodextrin, chloroacetic acid and N-methylformamide to obtain graft-modified beta-cyclodextrin; performing a reaction on organic titanate, soluble metal salt and the porous charcoal powder in a sealed environment to obtain modified porous charcoal; compounding the modified beta-cyclodextrin, the modified porous charcoal and a silane coupling agent to obtainthe cyclodextrin/photocatalyst composite modified carbon-based water purifying agent. Through compounding of the porous charcoal, grafted amphoteric chitosan and modified titanium dioxide, the water purifying agent integrates the functions of adsorption, flocculation, catalytic degradation and the like, so that the effect of purifying a water body in multiple aspects is achieved.

The invention discloses a preparation method of kaolin nanotubes. The preparation method comprises the following steps: flaky kaolin and an intercalating agent (such as N-methylformamide) are mixed, then are ball-milled in a high-energy ball mill for 1 min to 24 h, and are dried; the obtained mixture and a solvent (such as methanol) are mixed, and then are ball-milled in the high-energy ball millfor 1 min to 24 h to carry out a surface grafting reaction; the obtained reaction product and a structure inducing agent (such as a quaternary ammonium salt surfactant) are mixed, and are ball-milledin the high-energy ball mill for 1 min to 24 h; and finally the obtained mixture is dried and calcined to obtain the kaolin nanotubes. The preparation method converts kaolin with a flaky crystal structure into kaolin with a tubular crystal structure in a short time and a high efficiency, breaks the bottleneck restricting a processing and preparation technology of a kaolin-based catalyst carrier material, and achieves the purposes of high efficiency and low energy consumption.

The invention discloses a method for preparing a Y-type molecular sieve by using kaolin, which comprises the following steps of: (1) introducing an intercalation reagent into the kaolin to prepare kaolin intercalation composite powder; (2) modifying the kaolin intercalation composite powder with silicon or directly roasting the kaolin intercalation composite powder at the temperature of between 450 and 1,030 DEG C; or modifying the kaolin intercalation composite powder with silicon or directly adding the kaolin intercalation composite powder into inorganic binder and water, uniformly mixing the three, spraying the mixture to obtain microspheres and then roasting the microspheres at the temperature of between 450 and 1,030 DEG C; and (3) mixing the roasted powder or microspheres and inorganic silicon source, sodium hydroxide solution, directing agent and water, and crystallizing the mixture to obtain powder or microspheres containing the NaY molecular sieve. The method is characterizedin that: the intercalation modified kaolin is used for synthesizing the NaY molecular sieve; the intercalation reagent is one or more of urea, dimethyl sulfoxide, potassium acetate, potassium propionate, formamide, long-chain amine with carbon atom number of 8 to 12 and N-methylformamide; and the NaY content of the synthesized powder or microspheres of the NaY molecular sieve is 40 to 100 percent.

The invention belongs to the field of preparation of piezoelectric thin film materials and relates to a direct-writing preparation method of a high-flexibility organic electrode. The method comprisesthe specific steps that firstly, a piezoelectric thin film 3D model is established and cut into a slice; then, multi-wall carbon nanotubes are weighed and mixed with an N-methylformamide solution, themixed solution is subjected to ultrasonic dispersion to be uniform, and a precursor solution is obtained; polyaniline, polyvinylidene fluoride and acetone are added, sealing and ultrasonic dissolvingare conducted until complete dissolution is achieved, and writing ink is obtained; finally, a writing process and technology are set, a writing program is started, and the organic electrode is obtained. According to the direct-writing preparation method of the organic electrode, on the basis of guaranteeing smooth printing, the high-conductivity and high-flexibility organic electrode can be obtained; through flexible design for a writing trajectory, shapes and patterns which cannot be obtained by a traditional technology are directly written, the writing trajectory program is controllable, the electrode size is more accurate, and the application prospect is wide.