12 results about "Trimethylamine" patented technology

This invention discloses a cationic etherifying agent and its preparation method, belonging to the field of cationic etherifying agent production technology. The preparation method includes: continuously feeding trimethylamine and hydrochloric acid into a raw material pretreatment unit, pre-cooling to -10~20℃; entering a first tubular reactor, reacting at -10℃~20℃ and 0.15MPa for 10~60 minutes to generate trimethylammonium chloride; trimethylammonium chloride and epichlorohydrin entering a static mixer, simultaneously adding a catalyst and an organic amine; entering a second tubular reactor, reacting at 10~50℃ and 0.2MPa for 1~3 hours; during the reaction, monitoring the chloride ion concentration and epichlorohydrin residue in real time, dynamically adjusting the reaction parameters; filtering the reaction product through a nanofiltration membrane to obtain a high-purity cationic etherifying agent. This invention employs a continuous tubular reaction process combined with automatic control and nanofiltration membrane separation, resulting in a short production cycle, low energy consumption, few by-products, and a high-purity, odorless product, showing good industrial application prospects.

This invention relates to the field of water pollution control and treatment technology, and in particular to an aeration treatment device for wastewater in a trimethylamine purification process. The device includes a gas collection hood, a guide tube, an air distribution plate, and aeration pipes. The lower part of the gas collection hood has a slot connecting to its interior. The guide tube has a vertical axis, is open at both ends, and there are multiple guide tubes spaced apart along the length of the gas collection hood. This invention incorporates an air distribution plate and aeration pipes. By causing the air distribution plate to drive the multiple aeration pipes, which are circumferentially spaced, to reciprocate within a preset angle range, a non-steady, reciprocating sweeping flow field can be generated. This more effectively disrupts the flow pattern, preventing pollutants in the wastewater from accumulating in a specific direction. Furthermore, at the moment of oscillation and reversal, the water flow direction and the bubble ejection direction change abruptly, generating a stronger instantaneous shear force, similar to a "back-and-forth brushing" action, resulting in a more significant removal effect on impurities on the membrane fiber surface.

This invention provides a novel method for producing high-purity trimeciate trichloride, which can be obtained with volumetric efficiency and in good yield. [Solution] A method for producing trimeciate trichloride, comprising the steps of (I) reacting trimesic acid with the following compound (B) in the presence of at least one catalyst, iron(III) chloride, zinc oxide, and zinc chloride, and (II) separating the reaction product obtained in step (I) by distillation. Compound (B): 1,3-bis(trichloromethyl)benzene or 1,4-bis(trichloromethyl)benzene

The application discloses a cationic modified rosin anion rosin size with charge reversal stability and a preparation method and application thereof, and belongs to the technical field of anion rosin size. The rosin size is composed of the following raw materials in parts by mass: rosin 100-200 parts; epichlorohydrin 30-90 parts; trimethylamine 3-7 parts; tetrabutylammonium bromide 0.5-1 part; anion starch emulsifier 5-8 parts, sodium dioctyl sulfosuccinate 5-8 parts; defoaming agent 0.5-2 parts; and water 100-240 parts; wherein the anion starch emulsifier is prepared by reacting cassava starch and sodium chloroacetate under alkaline conditions. The modified rosin liquid and the anion emulsifier are emulsified by using a high-temperature normal-pressure phase inversion method to prepare the cationic modified rosin anion rosin size based on the charge reversal stability, and the cationic modified rosin anion rosin size has the characteristics of no chloropropanol, no organic chlorine and good stability, and can realize acid to neutral sizing.

This invention relates to a bio-induced penetrating crystallizing waterproof coating for marine environments and its preparation method. The waterproof coating is made from the following raw materials in parts by weight: 40-50 parts silane impregnating agent; 10-15 parts glycerol; 2-6 parts artificial inducing agent; 5-8 parts bio-calcium powder inducing agent; 3-5 parts pigment inducing agent; and 2-4 parts crystallizing precipitant. The artificial inducing agent is composed of norepinephrine and trimethylamine in a 1:1 mass ratio. The bio-induced penetrating crystallizing waterproof coating provided by this invention is an environmentally friendly coating with high-efficiency anti-corrosion and self-healing functions. Furthermore, it can utilize the aggregation effect of marine shellfish to further increase the corrosion resistance of the underlying concrete.

This invention relates to the field of organic synthesis technology, and discloses a cationic etherifying agent synthesized based on a composite catalyst and its preparation method. The agent is prepared by reacting epichlorohydrin, trimethylamine, hydrogen chloride, and a composite catalyst, which consists of anhydrous zinc chloride, anhydrous citric acid, and polyethylene glycol 400. The preparation method includes: preparing a trimethylamine hydrochloride base solution containing the composite catalyst under slightly acidic conditions; performing a ring-opening etherification reaction by adding epichlorohydrin dropwise in a controlled temperature stepwise manner; digesting by heating and holding at a constant temperature; continuously blowing in inert gas under a slightly acidic negative pressure environment for microbubble devolatilization; and finally, rapidly cooling through an external heat exchange device to complete the crystallization blocking. This invention improves the low-temperature storage and transportation stability and environmental safety of the cationic etherifying agent by shortening the reaction cycle to less than 12 hours; utilizing steric hindrance coupled with rapid cooling to lower the crystallization point to -9°C to -11°C; and reducing residual trimethylamine to 15 to 30 ppm through a dielectric-controlled gas stripping process.

This invention relates to the field of adsorption and filtration material preparation technology, specifically a multifunctional composite air purification filter material and its preparation method. It includes the following steps: S1, a method for preparing transition metal ion-modified carbon; S2, a filter material composite method. Compared with existing technologies, this invention provides a multifunctional composite air purification filter material and its preparation method. Modified activated carbon can remove sulfur and nitrogen compounds and odorous gases that are difficult to adsorb conventionally through ion network interaction. The use of copper sulfate, zinc sulfate, and 2-aminoimidazole synergistically can effectively complex and adsorb odorous gases with low olfactory thresholds, such as trimethylamine and methanethiol, which are difficult to treat. This modified activated carbon is then embedded between an activated manganese catalytic framework cloth and an electrostatic meltblown cloth, maintaining an extremely low filter material thickness, thus achieving efficient removal of formaldehyde, particulate matter, and odors from a single filter material.

The application discloses a method for preparing a food freshness indicating film by tyrosinase catalyzing covalent cross-linking of myofibrillar protein and anthocyanin, and has the characteristics that the method comprises the following steps: S1, preparing a myofibrillar protein solution; S2, adding tyrosinase and anthocyanin into the myofibrillar protein solution, and performing continuous stirring reaction under the condition of ice water bath and exposure to air, and adjusting the pH of the solution after the reaction is completed, so as to obtain a film-forming solution; and S3, pouring the film-forming solution into a culture dish for drying, so as to obtain the indicating film. The tyrosinase catalyzing method is used to covalently cross-link and combine the anthocyanin and the myofibrillar protein, and bacterial nanocellulose is added as a reinforcing agent, so that the indicating film with low anthocyanin release rate, high inlay stability and safe use can be prepared. In addition, the indicating film has high light stability, and the detection limit of trimethylamine can be as low as 1.5 micromoles, and the indicating film has superior trimethylamine response performance and detection stability.

The application belongs to the technical field of gas sensing material, and relates to a preparation method for alkaline gas sensing material, in particular to a preparation method for alkaline gas semiconductor sensing material. On the basis of the traditional hydrothermal synthesis and impregnation loading method for preparing gas recognition semiconductor material, the application introduces a bromine ion acidification modifier, introduces Br ion Lewis acid sites to the surface of the semiconductor material, introduces Br atoms in the form of compounds and doped ions into the semiconductor gas sensing material, regulates the acidity of the material surface, improves the surface acidity of the gas sensing material, and significantly enhances the specific adsorption and recognition performance of the material on alkaline gases such as trimethylamine and ammonia. The application avoids noble metal doping, has low cost, and strictly controls the amount of bromine-containing reagent, so that the environmental pollution of the additive is small.