15 results about "Diaminotoluene" patented technology

The invention discloses a preparation method of dimethyl thio toluenediamine, which comprises the following steps: continuously introducing dimethyl disulfide into a reaction system containing diaminotoluene and a catalyst for reaction, and evaporating and condensing the dimethyl disulfide in the reaction process so as to bring out a byproduct methyl mercaptan, after the reaction is finished, purifying and decoloring by adopting a neutralization distillation method to obtain dimethyl thio toluenediamine; the neutralization distillation method comprises the following steps: adding dimethyl disulfide into a reaction solution after the reaction is finished for dilution, then filtering the reaction solution to obtain a filtrate, adding an alkali solution into the filtrate for neutralization, heating and stirring, and finally carrying out reduced pressure distillation. The preparation method disclosed by the invention has the advantages of small catalyst dosage, short reaction time, high product yield and economic and environment-friendly purification and decoloration modes.

The invention relates to a method for reducing the content of 2, 6-diaminotoluene and / or 2, 4-diaminotoluene in a polyol, in particular in a recovered polyol, in which a polyol containing 2, 6-diaminotoluene and / or 2, 4-diaminotoluene is reacted with at least one compound selected from the group consisting of a), b) and c), in which the polyol containing 2, 6-diaminotoluene and / or 2, 4-diaminotoluene is reacted with at least one compound selected from the group consisting of a), b) and c), wherein: a) one or more epoxy-functional compounds, preferably dodecyl / tetradecyl glycidyl ethers, b) one or more anhydrides, in particular phthalic anhydrides, and c) one or more aldehydes, preferably benzaldehyde.

The invention provides a method for realizing zero sewage discharge of a 2, 5-diaminotoluene sulfate product, and belongs to the technical field of chemical engineering. Compared with the current method for applying part of wastewater (about 20 tons of wastewater is produced per ton of product) in a factory, the method for realizing zero sewage discharge of the 2, 5-diaminotoluene sulfate product comprises the following steps: extracting and recovering part of o-toluidine by using an extracting agent; the residual wastewater is subjected to Fenton oxidation and triple-effect evaporation to obtain wastewater meeting the discharge standard, and the wastewater is discharged to a sewage treatment plant, so that zero discharge of sewage can be realized.

The invention provides a green synthesis method of 2, 6-dihydroxytoluene. According to the synthesis method, 2, 6-diaminotoluene is taken as a raw material, 2, 6-dihydroxytoluene can be directly obtained through one-step hydrolysis reaction, a sulfuric acid aqueous solution is matched with copper sulfate in the reaction process, and the problems that coking is serious and the yield is low when sulfuric acid is independently used are solved. Sodium sulfate, especially solid waste sodium sulfate, is utilized to saturate a solution in the post-treatment process, so that the extraction rate is improved, and the unit consumption of ethyl acetate is reduced. The synthesis method disclosed by the invention is high in efficiency, low in cost, less in three wastes, green and environment-friendly, and suitable for industrially producing the 2, 6-dihydroxytoluene.

The present invention relates to a process for treating a substance mixture comprising an aromatic amine, in particular a crude aniline substance mixture. In particular, the present invention relates to a process for treating a substance mixture comprising an aromatic amine, wherein the aromatic amine is aniline or 2,4-diaminotoluene, preferably aniline, wherein the substance mixture is a first substance mixture and comprises the aromatic amine and a compound having a higher boiling point than the aromatic amine, the process comprising the steps: I) distillative separation of the first substance mixture in a first distillation unit (110, 1130) to separate at least partially the aromatic amine, thereby additionally obtaining a first bottoms product, and discharging the first bottoms product from the first distillation unit (110, 1130). The bottoms product from the first distillation unit (110, 1130) is diluted after discharge with condensed overhead product from a distillation unit different from the first distillation unit and / or with a composition comprising methanol.

The invention discloses a method for inhibiting a deamination side reaction in a hydrogenation process of 2, 4-diaminotoluene, and relates to the technical field of chemical production. The method comprises the following steps: adding a supported single-metal ruthenium-based heterogeneous catalyst, 2, 4-diaminotoluene, a deamination inhibitor and a reaction solvent into a reaction kettle, sealing the reaction kettle, replacing air in the kettle for three times with N2 at room temperature, starting low-speed stirring at 10-100 rpm, simultaneously introducing H2 to replace the atmosphere in the reaction kettle, dissolving a part of hydrogen, finally introducing H2 to the pressure of 2-5 MPa, controlling the temperature to be 150-200 DEG C, and reacting for 1-2 hours to obtain the 2, 4-diaminotoluene. And increasing the stirring speed to 700-1000rpm, and carrying out hydrogenation reaction for 8-15h to obtain a corresponding product. According to the method, the deamination inhibitor is adopted to inhibit the deamination side reaction in the process of preparing the HTDA by catalyzing TDA hydrogenation through the loaded single-metal ruthenium-based heterogeneous catalyst, efficient and green preparation of the target product HTDA is achieved, the selectivity of the HTDA is improved by 20%-30%, the deamination side reaction is basically avoided, the atom utilization rate of the reaction is improved, and the requirement for equipment is low.

The invention discloses a preparation method of a high-strength antifouling porcelain insulator. The preparation method comprises the following steps: (1) preparing doped powder; (2) preparing modified powder; (3) heating toluene diisocynate in a water bath to 82 + / -2 DEG C, preserving heat, then adding dehydrated polyether polyol, stirring for 3 hours, then naturally cooling to normal temperature, adding the modified powder, gamma-glycidyl ether oxypropyl trimethoxy silane, polymethylene polyphenyl polyisocyanate, acetone, 2, 4-diaminotoluene and deionized water, adding materials, stirring and mixing to obtain a coating; and (4) spraying the coating on the surface of a porcelain insulator substrate, drying, and placing at room temperature to obtain the high-strength antifouling porcelain insulator. The porcelain insulator coating prepared by the method has good hydrophobicity and scratch resistance, the water contact angle is larger, sewage is not easy to adhere, the anti-pollution capability is strong, the coating strength is higher, the adhesive force is strong, the coating is not easy to fall off, and the durability of the porcelain insulator is improved.

The invention discloses a catalyst applicable to continuous production of methyl cyclohexanediamine by a fixed bed. The catalyst comprises the following components in percentage by mass: 0.5-5.0% of platinum group metal and 95.0-99.5% of modified carrier. The preparation method comprises the following steps: carrying out modification such as additive addition, balling, sieving and vacuum calcination on a carrier, dipping the carrier in a platinum group metal solution, carrying out ultrasonic treatment, drying, reducing, filtering and drying, so that platinum group metal is uniformly and firmly dispersed on the carrier, and the defects of low utilization rate, non-uniform distribution and the like of active components of an existing catalyst are overcome. The catalyst has the advantages of high activity, strong stability and the like. The catalyst is used for synthesizing methyl cyclohexanediamine through diaminotoluene hydrogenation, deamination in the reaction process is inhibited under the action of the catalyst and under the condition of appropriate technological parameters, the conversion rate of diaminotoluene (TDA), the selectivity of methyl cyclohexanediamine (HTDA) and the yield of HTDA are improved, and HTDA is easy to separate and purify and suitable for large-scale continuous production.

This invention provides an enhanced chlorine-resistant reverse osmosis membrane, comprising a base layer, a polyamide layer, and a polymeric protective layer. The polyamide layer is disposed on the base layer, and the polymeric protective layer is disposed on the polyamide layer. The polyamide layer is formed by interfacial polymerization of a diamine aqueous phase and a polyacrylamide oil phase. The solute in the diamine aqueous phase includes common amines and specific diamines, and the specific diamine includes at least one selected from 2-methyl-p-phenylenediamine, 4-methyl-1,3-phenylenediamine, 2,6-diaminotoluene, and 2,4,6-trimethyl-1,3-phenylenediamine. The polymeric protective layer is connected to the surface of the polyamide layer through polyaldehyde molecules. This invention, through the combination of the base layer, the polyamide layer, and the polymeric protective layer, enables the enhanced chlorine-resistant reverse osmosis membrane to achieve both a high desalination rate and excellent chlorine resistance.

The invention discloses a bifunctional monomer synergistic molecularly imprinted electrochemical sensor and a preparation method and application thereof, the preparation method comprises the following steps: polishing a glassy carbon electrode, and cleaning for later use after polishing; the method comprises the following steps: preparing an electrochemical polymerization solution of o-phenylenediamine (o-PD), 3, 4-diaminotoluene (3, 4-DAT) and perfluorooctane sulfonate, and taking a mixed solvent of a 0.1 M acetate buffer solution and methanol as a solvent; taking the pretreated glassy carbon electrode as a working electrode, putting a three-electrode system into an electrochemical polymerization solution, and performing electrochemical polymerization on molecularly imprinted poly-o-phenylenediamine and 3, 4-diaminotoluene by using a cyclic voltammetry to obtain a modified electrode; and cleaning the modified electrode to obtain the electrode. The electrochemical sensor has high sensitivity, excellent reproducibility, good stability and good recovery rate, and can rapidly detect perfluorooctane sulfonate in the environment with high sensitivity.

This invention discloses an anti-yellowing LC-grade dimethylthiotoluene diamine, its preparation method, and its applications, relating to the field of dimethylthiotoluene diamine chemical raw material technology. The method includes dimethylthiolation of diaminotoluene to obtain a crude product; partial acylation with trimesoyl chloride to introduce a steric barrier; and compounding with TEMPOL, antioxidants 1010 and 168 to construct a three-level synergistic antioxidant network, yielding an anti-yellowing intermediate; then introducing nano-boron nitride and octaphenyl cage-type silsesquioxane to construct an organic-inorganic hybrid heat-resistant network, obtaining an anti-yellowing and heat-resistant product; finally, using γ-cyclodextrin to encapsulate TEMPOL and phytic acid to chelate metal ions, achieving long-term antioxidant stability. The resulting product exhibits excellent anti-yellowing properties, heat resistance, and long-term stability during high-temperature service.

The invention discloses a compound applied to a temperature controller and a synthesis method of the compound, the compound is N-(2-methyl-3-phthalimide) phenyl hexahydrophthalimide, and the compound can replace triptycene to be applied to the temperature controller needing a 252-255 DEG C disconnection scene. The synthesis method of the N-(2-methyl-3-phthalimide) phenyl hexahydrophthalimide comprises the following steps: (1) generating high-purity N-(2-methyl-3-amino) phenyl phthalic acid from excessive 2, 6-diaminotoluene and phthalic anhydride in acetone; and (2) carrying out reflux dehydration on the N-(2-methyl-3-amino) phenyl phthalic acid and hexahydrophthalic anhydride in methylbenzene, so as to obtain the high-purity N-(2-methyl-3-phthalimide) phenyl hexahydrophthalimide. The synthesis method is simple and efficient, the molar yield can reach 83% or above, and the melting range of the product is stabilized between 252 DEG C and 255 DEG C.

The present application belongs to the field of fine chemical wastewater treatment technology, and is specifically related to a kind of recycling treatment method of 2,5-diaminotoluene sulfate production wastewater.The recycling treatment method of the present application includes the pH adjustment of 2,5-diaminotoluene sulfate production wastewater to neutrality, adds separating agent, and stratification after reaction obtains the lower layer as the first aqueous phase, and the upper layer is separated phase;The first aqueous phase goes to evaporate and desalinate, and acidic solution is added to separated phase, and stratification after reaction obtains the lower layer as recovery phase, and the upper layer is separating agent regeneration phase, and separating agent regeneration phase is used for circulating 2,5-diaminotoluene sulfate production wastewater, and alkaline solution or sulfate solution are added in recovery phase to recover o-toluidine or 2,5-diaminotoluene sulfate.The processing method of the present application is simple to operate, and has certain economic benefits.

The application discloses a dinitrotoluene hydrogenation catalyst and a preparation method and application thereof. The preparation method of the hydrogenation catalyst comprises the following steps: placing a MAX material in a mixed acid solution for etching treatment, washing, intercalation treatment, centrifugation and freeze-drying of the product after etching to obtain a precursor MXene powder; dispersing the precursor MXene powder in water, adding a tetravalent platinum salt, stirring, and then freeze-drying to obtain a platinum catalyst with MXene as a carrier, namely a dinitrotoluene hydrogenation catalyst. The platinum catalyst with MXene as a carrier prepared by the application has excellent catalytic performance, can quickly and highly selectively catalyze dinitrotoluene hydrogenation reduction into diaminotoluene under relatively mild conditions, and the selectivity and conversion rate are close to 100%. Meanwhile, the preparation process of the catalyst is simple, the loading amount of the noble metal platinum is low, the preparation cost is low, the catalyst can be recycled, and the catalyst has a good industrial application prospect.

The invention discloses a preparation method of 2, 5-diaminotoluene and sulfate thereof, and relates to the technical field of chemical synthesis. According to the invention, 2-methyl-4-nitro-5-chloroaniline is adopted as a raw material, 2, 5-diaminotoluene is synthesized with high selectivity through a two-step process of nitro catalytic hydrogenation reduction and catalytic hydrogenation dechlorination, and the prepared 2, 5-diaminotoluene is adopted as a raw material and is mixed with sulfuric acid for salt forming reaction, so that sulfate can be obtained. Through the two-step hydrogenation process, the yield of the 2, 5-diaminotoluene can be improved, and the reaction conditions can be optimized, so that the 2, 5-diaminotoluene is suitable for industrial production. In addition, the preparation method conforms to the green chemistry principle, and the environmental protection pressure and the wastewater treatment cost are greatly reduced. Specifically, the yield of the prepared 2, 5-diaminotoluene sulfate can reach 85% or above, and the purity of the prepared 2, 5-diaminotoluene sulfate is larger than 99.5%.