14 results about "Tetraacetylethylenediamine" patented technology

The invention provides a synthesis method for preparing high-yield tetraacetylethylenediamine at one time, which comprises the following steps: S1) taking ethylenediamine and toluene as a base, dropwise adding acetic acid, heating and refluxing at the same time, and dehydrating in a water segregator until no water is generated; s2) adding acetic anhydride and methylbenzene, carrying out low-temperature azeotropy to take out acetic acid, extracting and separating acetic acid from azeotropic liquid through ice water, drying a raffinate phase, then recycling the raffinate phase, carrying out high-temperature reflux reaction for 1 hour, and repeating low-temperature acid extraction and high-temperature reaction for three times respectively; the method has the advantages that the heat supply process and the methylbenzene low-temperature acid extraction process are repeatedly and sectionally implemented, so that the production efficiency is improved, the single yield is improved, the color of the product is better, and the method is suitable for large-scale industrial production.

The invention relates to the technical field of daily chemical industry, in particular to a washing machine tank cleaning effervescent tablet and a preparation method thereof. The washing machine tank cleaning effervescent tablet is prepared from the following raw materials in parts by weight: 40 to 60 parts of sodium percarbonate, 4 to 6 parts of tetraacetylethylenediamine, 1 to 3 parts of tetraacetyl glycoluril, 3 to 5 parts of microencapsulated sodium silicate, 12 to 18 parts of microencapsulated citric acid, 0.5 to 1.5 parts of benzotriazole, 0.5 to 1.5 parts of hydroxybenzotriazole, 1 to 2 parts of composite antibacterial agent, 3 to 5 parts of polyvinylpolypyrrolidone and 1 to 2 parts of magnesium stearate. And 0.3 to 0.7 part of essence. The washing machine tank cleaning effervescent tablet is prepared through gradient temperature control mixing and layered tabletting technologies, and has the effects of efficient cleaning, rapid disintegration, efficient antibiosis, small dosage and effective prevention of corrosion of metal parts in a low-temperature environment.

The invention belongs to the field of contact lens care, and particularly relates to a sandwich effervescent tablet for cleaning contact lenses and a preparation method of the sandwich effervescent tablet. The outer layer is prepared from the following raw materials: citric acid, sodium bicarbonate, disodium ethylene diamine tetraacetate, a surfactant, polyvinylpyrrolidone, microcrystalline cellulose and colloidal silicon dioxide; the middle layer is prepared from the following raw materials in parts by weight: sodium percarbonate, tetraacetylethylenediamine, phosphate buffer salt, a surfactant, anhydrous sodium carbonate, microcrystalline cellulose and colloidal silicon dioxide; the inner core is prepared from the following raw materials in parts by weight: catalase, a stabilizer, hydroxy propyl cellulose K4M, ethyl cellulose, microcrystalline cellulose and sodium bicarbonate. According to the invention, citric acid / bicarbonate is matched with an active agent to weaken a biological membrane in the outer layer, and a permeation channel is opened preferentially; the H2O2 platform is formed by matching middle-layer sodium percarbonate; and the inner core adopts HPMC / EC controlled-release catalase to realize hysteresis-burst release neutralization.

This invention relates to the field of comprehensive utilization of biomass resources, and discloses a pretreatment process for the efficient resource utilization of crop straw, comprising: mixing and impregnating crushed straw particles with a high-concentration solubility buffer; adding solid tetraacetylethylenediamine and flowing hydrogen peroxide solution for oxidation reaction; performing hot solid-liquid separation under no-cooling conditions, washing the filter cake to obtain cellulose enrichment, and combining the washing liquid with primary hot black liquor to obtain mixed black liquor; cooling the mixed black liquor to induce a phase change, separating lignin and cold mother liquor, discharging part of the cold mother liquor, and recycling the remaining mother liquor. This invention improves the separation efficiency of straw components by constructing a stable pretreatment reaction microenvironment through composition; prevents secondary lignin adhesion and achieves lignin precipitation by controlling the hot separation and cold phase change operations; and reduces the overall water and reagent consumption of the process by combining the mother liquor circulation design.

The invention provides a reactive dye salt-free dyeing method for a cotton fabric by means of oxygen bleaching, aims to integrate a desizing-scouring-bleaching process and a cationization modification process, and comprises the steps of desizing-scouring-bleaching, low-temperature activation oxygen bleaching, cationic solution dipping, dyeing and the like. A traditional oxygen bleaching process and a hydrogen peroxide-tetraacetylethylenediamine low-temperature oxidation process are combined, firstly, the raw cotton fabric is selectively oxidized, selective conversion from hydroxyl to carbonyl on the surface of cotton fiber is achieved, and meanwhile desizing, boiling-off and bleaching are conducted on the raw cotton fabric; subsequently, the oxidized carbonyl-containing cotton fabric and a polyhexamethylene guanidine hydrochloride aqueous solution are subjected to a Schiff base reaction, and cationic groups are successfully introduced to the surface of the cotton fiber, so that the dye-uptake rate and fixation rate of salt-free dyeing of the reactive dye are improved, and the modified cotton fabric is endowed with excellent mechanical strength and whiteness on the basis of the dye-uptake rate and fixation rate.

Described herein are cleaning compositions comprising an alkali metal bicarbonate, an alkali metal carbonate, an acid source, an antibacterial composition comprising sodium percarbonate and tetraacetylethylenediamine, and wherein the sodium percarbonate is present in an amount ranging from about 2 wt% to about 15 wt% based on the total weight of the cleaning composition, and the amount of tetraacetylethylenediamine is in the range of about 1 wt% to about 7 wt% based on the total weight of the cleaning composition.

Solid composition, comprising 40 to 60 % by weight of a peroxygen donor, 20 to 35 weight per cent of an acetyl donor, 10 to 35 wt.% of a coated organic acid and, preferably, 0.1 to 1.5% by weight of (

Disclosed is a chemical composition for electronically activated chemical rock breaking system, and it includes potassium chlorate with ratio of 20-55% by weight of the chemical composition, sodium perborate and / or Tetra acetyl ethylene diamine (TAED) or any combination of them with ratio of 10-24% by weight of the chemical composition, at least one fruit and / or vegetable powder selected from the group consisting of carob powder, dried grape powder, dried currant powder, dried date powder, dried coconut fruit powder, dried pumpkin powder, dried sugarcane, sugar beet powder, dried tamarind powder and dried fig powder with ratio of 9-28% by weight of the chemical composition, at least one powder selected from the group consisting of olive pulp powder, nut shell powder, coconut shell powder, pumpkin seed shell powder, sunflower seed shell powder with ratio of 5-20% by weight of the chemical composition.

This application relates to the field of sludge treatment technology, and discloses a sludge dewatering agent and a sludge dewatering method. The dewatering agent consists of reagent A (sodium percarbonate and tetraacetylethylenediamine powder), reagent B (magnesium sulfate solution), reagent C (polyferric sulfate solution), and reagent D (cationic polyacrylamide solution), which are packaged independently. The dewatering method involves adding the above reagents in sequence: first, reagent A is used to oxidize and break down the extracellular polymers of the sludge, releasing endogenous phosphorus and nitrogen and providing a slightly alkaline environment; then, reagent B is added, causing it to crystallize in situ with phosphorus and nitrogen in the liquid phase to form a rigid magnesium ammonium phosphate framework, improving the sludge permeability; next, reagent C is added to neutralize the alkalinity of the system and trap residual microcrystals and free phosphorus; finally, reagent D promotes floc formation, followed by filter press dewatering. This invention reduces the amount of external dewatering additives and the moisture content of the sludge cake, realizes the conversion and utilization of endogenous phosphorus and nitrogen in the sludge, and avoids secondary pollution caused by phosphorus enrichment in the effluent.

The present invention relates to complex forms of tetraacetylethylenediamine (TAED) and methods of making the same. The complex form may include a novel crystalline form. The invention also relates to the crystalline forms themselves. The invention also relates to compositions comprising tetraacetylethylenediamine in these forms.

The application discloses a method for degrading naproxen in water by using a divalent manganese / percarbonate / tetraacetylethylenediamine system and relates to a method for degrading naproxen in water by using a high-level oxidation technology. The method comprises the following steps: adding percarbonate and tetraacetylethylenediamine into water to be treated containing naproxen, adjusting the pH value of the water to be treated to 5-10, adding divalent manganese for treatment, and stirring and reacting for 10-60 minutes at a water temperature of 5-35 DEG C. The method has the advantages of fast generation speed of active species, high removal efficiency of organic pollutants, high utilization rate of oxidants, no need to increase other treatment equipment, low one-time investment cost, low operation cost, simple operation, wide application range, green environmental protection and the like, and has a wide application prospect in the treatment of organic wastewater, such as medical wastewater and aquaculture wastewater, containing naproxen.

The invention discloses a green synthesis method of tetraacetylethylenediamine and a used catalyst, and belongs to the technical field of organic synthesis. According to the synthesis method, a microwave-assisted technology and a recyclable acidic ionic liquid catalyst are creatively combined, ethylenediamine and acetic anhydride are adopted as raw materials, and tetraacetylethylenediamine (TAED) is efficiently synthesized through a two-step continuous acetylation process without intermediate separation. The reaction efficiency is enhanced through the microwave-ionic liquid synergistic effect, and the problems of long reaction time, high energy consumption, catalyst pollution and low product purity in the traditional synthesis process are solved. The product yield can reach 85% or above, the purity can reach 98.0% or above, the activity retention rate is still larger than or equal to 90% after the acidic ionic liquid catalyst is recycled 15 times, no acidic wastewater is discharged, and the method has remarkable economic and environmental benefits and is suitable for industrial large-scale production.

The invention discloses an acylation reaction system for synthesizing tetraacetylethylenediamine. The acylation reaction system comprises a primary acylation reaction system and a secondary acylation reaction system, the first-stage acylation reaction system comprises a first-stage feeding mechanism, a first-stage acylation reaction kettle, a first condensation mechanism, a second-stage acylation reaction kettle, a second condensation mechanism and a water separation tank; a catalyst bed layer of the first-stage acylation reaction kettle I is arranged in the first-stage acylation reaction kettle I, and the catalyst bed layer of the first-stage acylation reaction kettle I is cylindrical; a first-stage acylation reaction kettle II catalyst bed layer is arranged in the first-stage acylation reaction kettle II, and the first-stage acylation reaction kettle II catalyst bed layer is cylindrical; the second-stage acylation reaction system comprises a second-stage feeding mechanism, a first second-stage acylation reaction kettle, a second condensation mechanism, a second second-stage acylation reaction kettle, a second condensation mechanism and an acid-containing agent receiving tank. The reaction system disclosed by the invention can overcome the defects of a traditional kettle type reactor, and realizes efficient recycling of the water-carrying agent and the acid-carrying agent.

A water-soluble automatic dishwashing detergent pouch includes an automatic dishwashing detergent composition that is enclosed by a water-soluble film. The automatic dishwashing detergent composition includes dipicolinic acid and / or salt thereof; transition metal bleach catalyst that is a dinuclear manganese-complex, greater than about 0.2 wt. % bleach activator that is tetraacetylethylenediamine (TAED); and a source of peroxygen that is sodium percarbonate.