5 results about "Diaminotoluene" patented technology

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.

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.

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 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%.