24 results about "Trioxane" patented technology

The invention discloses an application of an ionic liquid in extraction of trioxymethylene, in the process of generating trioxymethylene by acid-catalyzed condensation of a formaldehyde aqueous solution, the ionic liquid is added as an extraction agent to extract and separate the trioxymethylene generated by reaction, and the ionic liquid is methyl tributyl phosphonium bis (trifluoromethanesulfonyl) imide salt; when the ionic liquid is used for extracting trioxymethylene, a ternary azeotropic system of trioxymethylene, water and methylene glycol can be broken, the ionic liquid and trioxymethylene are subjected to nonpolar Van der Waals' force interaction so as to realize extraction, and methylene glycol and water are left in a water phase through hydrogen-bond interaction, so that high-purity trioxymethylene with the purity of more than or equal to 99.5 wt.% is obtained.

The utility model relates to the technical field of trioxymethylene reactor pressure detection, and discloses a trioxymethylene reactor pressure detection device, which comprises a reactor main body, a pressure detector and a display panel, a pressure controller is arranged on the reactor main body, and a reactor gas phase pipeline is arranged on the reactor main body. According to the trioxymethylene reactor pressure detection device, the pressure detector is arranged on the reactor gas phase pipeline of the reactor main body, the pressure controller is installed on the reactor main body, the pressure detector is arranged on the reactor gas phase pipeline, and the pressure controller is arranged on the reactor gas phase pipeline of the reactor main body. The internal pressure of the reactor gas phase pipeline can be detected through the pressure detector, the internal pressure of the reactor main body can be detected through the pressure controller, and the pressure difference between the two sides of the reactor silk screen layer can be obtained through the pressure controller and displayed on the display panel, so that the working condition of the reactor main body can be conveniently and quickly checked; and the blockage problem can be timely found and processed.

The application relates to the field of CO2 utilization and storage technology, and discloses a double Mannich base corrosion inhibitor as well as a preparation method and application thereof. The method is carried out under the condition that the pH is 3-4; the method comprises the following steps: (1) in the presence of ethanol, a compound shown in formula (A) is subjected to a first reaction with 1,3,5-trioxane to obtain an intermediate product; in formula (A), R is -(CH2)7CH=CH(CH2)7CH3; (2) in the presence of ethanol, the acetophenone is added dropwise into the intermediate product to carry out a second reaction, so that the double Mannich base corrosion inhibitor is obtained; the dropwise speed of the acetophenone is 0.0125-0.05 mL / s relative to 1 mol of the compound shown in formula (A); wherein the molar ratio of the compound shown in formula (A), the acetophenone and the 1,3,5-trioxane is 1:2.0-2.3:2.0-2.3. Formula (A).

This disclosure relates to the field of chemical production technology, and in particular to a production apparatus and method for trioxymethylene. The trioxymethylene production apparatus includes: a reaction unit, a separation unit, a first formic acid absorption unit, and a product distillation unit. The outlet of the reaction unit is connected to the inlet of the separation unit; the gas phase outlet of the separation unit is connected to the inlet of the first formic acid absorption unit; the outlet of the first formic acid absorption unit is connected to the inlet of the product distillation unit; and the liquid phase outlet of the separation unit is connected to the inlet of the reaction unit. The reaction unit is used to convert formaldehyde into trioxymethylene under the action of a catalyst. The separation unit is used to separate the gas phase product from the reaction unit into a liquid stream containing recycled formaldehyde and a gas phase stream containing trioxymethylene. The trioxymethylene production apparatus and method provided by this disclosure are used to remove formic acid, a byproduct in the trioxymethylene production process, and reduce equipment corrosion.

The invention relates to the technical field of CO2 utilization and storage, and discloses a bis-Mannich base corrosion inhibitor as well as a preparation method and application thereof. The method is carried out under the condition that the pH is 3-4. The method comprises the following steps: (1) in the presence of ethanol, carrying out first reaction on a compound as shown in a formula (A) and 1, 3, 5-trioxane to obtain an intermediate product; in formula (A), R is-(CH2) 7CH = CH (CH2) 7CH3; and (2) in the presence of ethanol, dropwise adding acetophenone into the intermediate product for a second reaction to obtain the bis-Mannich base corrosion inhibitor, the dropping rate of acetophenone is 0.0125-0.05 mL / s relative to 1 mol of the compound as shown in the formula (A); wherein the molar ratio of the compound shown in the formula (A) to the acetophenone to the 1, 3, 5-trioxane is 1: (2.0-2.3): (2.0-2.3). Formula (A).

This invention relates to a process for preparing compounds having formula (I): R 1 ‑C(=O)‑O‑CH2‑O‑C(=O)‑R 2 (I), where R 1 and R 2 Each of the terms represents an alkyl, cycloalkyl, or aryl group independently, wherein the alkyl, cycloalkyl, or aryl group is optionally substituted; the process includes step i) reacting the following substances: compound A selected from: trioxane, polyoxymethylene without a hydroxyl terminal group; compound (II): R 1 -C(=O)-O-C(=O)-R 2 (II); and perfluorosulfonic acid; wherein step i) is carried out at a temperature T1 of at least 50°C, wherein the molar ratio of compound (II) to compound A is 1:1 to 1.2:1.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

A process for preparing trioxane from methanol includes: step 1: subjecting a mixture of methanol and methylal to a reaction to obtain formaldehyde, and absorbing the formaldehyde with water to obtain a concentrated formaldehyde aqueous solution; step 2: subjecting the concentrated formaldehyde aqueous solution to cyclization to obtain a mixture containing trioxane, and passing the mixture through a trioxane concentration tower to obtain a crude trioxane product; step 3: converting a by-product and unreacted formaldehyde in the crude trioxane product into methanol, conducting dehydration through a membrane dehydration process, and subjecting a retentate to dealcoholization to obtain purified trioxane; and step 4: subjecting the remaining streams to reactive distillation to obtain a mixture of methanol and methylal at a top- and water at a bottom of the reactive distillation tower; returning the mixture of methanol and methylal to step 1; and returning or discharging the water.

The present disclosure relates to anti-cancer agents comprising 1,2,4-trioxane compounds and anti-cancer agents comprising combinations comprising 1,2,4-trioxane compounds and chlorogenic acids. The disclosure further provides pharmaceutical compositions comprising such anti-cancer agents, kits comprising the same as well as methods and treatment regimens of using the aforementioned anti-cancer agents, pharmaceutical compositions and kits in the treatment and prevention of cancer and for prolonging survival of subjects having cancer, in particular ovarian cancer or lung cancer

The invention relates to the technical field of trioxymethylene production, and discloses a composition for trioxymethylene and a method for synthesizing trioxymethylene. The composition contains a formaldehyde aqueous solution, an acid catalyst and a catalytic promoter, in the formaldehyde aqueous solution, the content of formaldehyde is 28-75wt%, the content of methanol is 0.5-3wt%, and the content of formic acid is 0.02-0.5 wt%; the acid catalyst is sulfuric acid of which the concentration is not lower than 90wt%; relative to 1kg of the formaldehyde aqueous solution, the content of the acid catalyst is 0.3 to 1.0 mol, and the content of the catalytic promoter is 0.3 to 2.0 mol. According to the scheme, the activity of water in the formaldehyde aqueous solution can be reduced, and the relative volatility of the product trioxymethylene and water can be improved, so that the generation of a byproduct formic acid is reduced, and the conversion rate of formaldehyde and the yield of trioxymethylene are improved.

The disclosure provides for mass spectrometry (MS)-cleavable trioxane-based cross-linkers, and uses thereof, including for protein-protein interaction studies using cross-linking mass spectrometry.

The present disclosure relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery comprising the same, and the electrolyte for the lithium-sulfur battery includes a nonaqueous solvent, a lithium salt, nitrate and trioxane, wherein the nonaqueous solvent includes an ether-based solvent, and the ether-based solvent includes a cyclic ether and an acyclic ether.

The present invention relates to a process of preparation of a compound having formula (I):wherein R1 and R2 represent, independently of each other, an alkyl, a cycloalkyl or an aryl group, said alkyl, cycloalkyl or aryl group being optionally substituted;said process comprising a step i) of reacting:a compound A selected from the group consisting of: trioxane, polyoxymethylene deprived of hydroxyl end groups;a compound of formula (II):anda perfluorosulfonic acid;wherein step i) is carried out at a temperature T1 of at least 50° C., wherein the molar ratio of compound of formula (II): compound A ranges from 1:1 to 1.2:1.

The invention relates to a polymer electrolyte for a low-temperature lithium metal battery and a preparation method of the polymer electrolyte. The polymer electrolyte is used for low-temperature circulation of a solid-state lithium metal battery, and can solve the problems of low ionic conductivity, poor electrode / electrolyte interface contact and the like of a polymer electrolyte at a low temperature. The polymer electrolyte is prepared by heating and compounding acrylate, methyl methacrylate, ethylene carbonate, vinyl ethylene carbonate, propylene oxide, tetrahydrofuran, 1, 3-dioxolane, 1, 4-dioxane or 1, 3, 5-trioxane, a lithium salt, a plasticizer, an additive and a supporting film. The solid-state lithium metal battery adopting the polymer electrolyte disclosed by the invention can stably circulate for 100 circles at the low temperature of-15 DEG C, so that the cycle performance of the solid-state lithium metal battery at the low temperature is greatly improved, and the polymer electrolyte has a wide application prospect.

The invention discloses a trioxymethylene synthesis and concentration method, which comprises the following steps: feeding a concentrated formaldehyde solution into a trioxymethylene reactor, and enabling a sulfuric acid catalyst to automatically flow into the trioxymethylene reactor in a head tank through a mass flowmeter and a regulating valve; the concentrated formaldehyde solution is subjected to an exothermic reaction under the action of a sulfuric acid catalyst, a trioxymethylene gas-phase crude product is obtained at the top of the trioxymethylene reactor, the trioxymethylene gas-phase crude product is sent to a trioxymethylene concentration tower to be continuously concentrated, and concentrated trioxymethylene is obtained at the top of the trioxymethylene concentration tower; the mass concentration of the concentrated formaldehyde solution is 55-75%, and the mass concentration of the sulfuric acid catalyst in the trioxymethylene reactor is 0.4-2%. According to the invention, the corrosion of the reaction system is reduced, the coking blockage of the reboiler is reduced, the energy consumption is reduced, and the reaction conversion rate is improved.

A method for producing a polyacetal copolymer, which includes a step of copolymerizing 100 parts by mass of trioxane (A), 0.05 to 5 parts by mass of a cyclic acetal compound having an oxoalkylene group having 2 or more carbon numbers in a ring (B), and 0.001 to 0.5 parts by mass of a prescribed fatty glycidyl ether compound (C) having a sodium content of 0.1 to 100 parts by mass ppm in the presence of a linear acetal compound (D) as a molecular weight regulator, wherein in the step, the total mass (g) of (A) to (C) is defined as a, the number of moles of (D) is defined as b, and the total number of moles of moisture and methanol contained in (A) to (C) is defined as c and d, respectively, and is set to satisfy (b + c + d) / a = 4.5 to 9 μmol / g.

The invention relates to the technical field of lithium metal battery electrolytes, in particular to an electrolyte, application thereof and a cathode-free lithium metal battery. The invention provides an electrolyte. The electrolyte comprises a lithium salt, a solvent, a diluent and an additive, the diluent comprises a 1, 3-dioxane derivative, acetal carbon located at the position 2 in the 1, 3-dioxane of the 1, 3-dioxane derivative is substituted by Rf1 and Rf2, and the Rf1 and the Rf2 are the same or different; the Rf1 and the Rf2 are independently fluorine substituted alkyl groups; the additive is prepared from one or more of 1, 3, 5-trioxane, a derivative of the 1, 3, 5-trioxane and paraldehyde, and the additive is prepared from one or more of 1, 3, 5-trioxane, a derivative of the 1, 3, 5-trioxane and paraldehyde. The electrolyte can give consideration to both excellent ion transmission and lithium deposition dynamic performance under a low-temperature condition.

This invention discloses a zinc-based polyoxymethylene gel electrolyte based on weak interactions and its preparation method. Using bis(trifluoromethanesulfonyl)imide zinc (Zn(TFSI)2), dimethyl carbonate (DMC), and 1,3,5-trioxane monomer (TXE) as raw materials, DMC-POM-Zn(TFSI)2 is prepared via ring-opening polymerization. Zn(TFSI)2 acts as the zinc salt and initiator, while DMC acts as the solvent and plasticizer. A weak interaction is formed between DMC and the polyoxymethylene matrix (POM). The resulting DMC-POM-Zn(TFSI)2 exhibits an electrochemical impedance of 7.0–8.0 Ω and an ionic conductivity of 0.55–0.70 mS·cm. ‑1 It can cycle stably for more than 3000 hours, and the polarization voltage remains at 80-90 mV during the cycle.

The invention discloses a full-temperature-range gas phase pressure swing adsorption process crossing trioxymethylene-formaldehyde-water ternary azeotropic composition, which mainly comprises the steps of raw material flow, pressure swing adsorption concentration, pressure swing adsorption desorption and dilute aldehyde recovery side flow circulation, and utilizes cyclic operation of pressure swing adsorption and desorption. According to the method, the existing technology, including extractive distillation, which is adopted in the production process of trioxymethylene and is composed of trioxymethylene-formaldehyde-water ternary azeotrope is effectively matched and replaced, other processes do not need to be changed, and the energy consumption and the production cost are greatly reduced.

The present application relates to the technical field of preparing formic acid gas standard substance, and more particularly to a system and method for preparing formic acid gas standard substance in air. The system comprises a nitrogen source, an oxygen source, a vacuum pump, a raw material container, an intermediate container, a finished product container, a first three-way valve, a second three-way valve, a catalytic cracking pipe and a catalytic oxidation pipe; the nitrogen source, the oxygen source and the vacuum pump are communicated with the first three-way valve; the raw material container is communicated with the intermediate container through the second three-way valve and the catalytic cracking pipe in sequence; the intermediate container is communicated with the finished product container through the catalytic oxidation pipe; and the first three-way valve is communicated with the second three-way valve. The present application prepares formic acid standard gas through a two-step reaction with trioxane as a raw material, avoids the quality loss in the process of preparing formic acid standard gas with fuming formic acid, and can accurately obtain the amount of formic acid standard gas.

The application is suitable for the technical field of gas preparation, and provides a preparation method and system of formaldehyde bottled standard gas, the preparation method of formaldehyde bottled standard gas comprises the following steps: placing solid trioxane and a catalyst in a reactor; performing vacuumizing treatment on the reactor and a transfer pipeline in steps; heating the reactor in a predetermined temperature range to make the trioxane catalytically cracked into formaldehyde gas; blowing the formaldehyde gas to a pre-saturation gas cylinder through the passivated transfer pipeline; and supplementing inert gas into the gas cylinder to obtain formaldehyde standard gas, the preparation method of formaldehyde bottled standard gas provided by the application realizes cracking conversion rate ≥ 95%, transfer efficiency ≥ 95%, and standard gas concentration stability reaches 1.6 ppb / day by optimizing the structure of the cracking reactor, i.e. three-way ball valve multi-state control, precise temperature control, segmented pressure blowing transfer and gas cylinder pre-saturation treatment, and solves the technical bottlenecks of formaldehyde adsorption loss and fast value decay in the traditional method.

The invention belongs to the technical field of fine chemical synthesis, and particularly relates to a continuous production process of 1, 3, 5-triacryloyl hexahydro-1, 3, 5-triazine and a device thereof. The process comprises the following steps: (1) mixing trioxymethylene or paraformaldehyde, acrylonitrile, a polymerization inhibitor and a solvent to obtain a reaction raw material solution; mixing an acid with a solvent to obtain a catalyst acid solution; (2) continuously pumping the reaction raw material solution and a catalyst acid solution into a dynamic tubular reactor respectively for condensation reaction to generate a reaction solution; (3) continuously discharging the reaction liquid from an outlet of the dynamic tubular reactor into a receiving tank, and cooling to obtain a solid-liquid mixture; and (4) carrying out centrifugal separation on the solid-liquid mixture, so as to obtain the 1, 3, 5-triacryloyl hexahydro-1, 3, 5-triazine. The reaction efficiency, the production safety and the product yield are remarkably improved by accurately controlling the reaction temperature, shortening the material retention time and adding the polymerization inhibitor.

The invention discloses a 1, 3, 5-trioxane production system capable of recovering auxiliaries, which comprises a synthesis reaction rectifying tower, a light component removal tower kettle, a product concentration tower, an extraction tower, an extraction agent recovery dividing wall tower, membrane separation equipment and auxiliary extraction equipment, formaldehyde reacts in the synthesis reaction rectifying tower to obtain a 1, 3, 5-trioxane crude product, and the auxiliary extraction equipment is used for extracting the auxiliaries. The 1, 3, 5-trioxane is separated through the light component removal tower and the product concentration tower, and is purified through the extraction tower and the extraction agent recovery dividing wall tower, so that the 1, 3, 5-trioxane with the purity being greater than or equal to 99.99% is obtained; the membrane separation equipment and the assistant extraction equipment can be used for recovering an assistant and sending the recovered assistant to the synthesis reaction rectifying tower. The invention also discloses a 1, 3, 5-trioxane production process capable of recovering the auxiliary agent. According to the 1, 3, 5-trioxane process production system and process, the product yield can be effectively increased, the yield of formic acid in side reaction is reduced so as to reduce corrosion to equipment, and compared with a traditional sulfuric acid method process, the production cost and energy consumption are lower, and more economical efficiency is achieved.

The present invention relates to a reactor for efficiently reacting formalin to produce 1, 3, 5-trioxane in a process for producing polyoxymethylene, and a trioxane production apparatus comprising the same. The trioxane reactor according to the present invention maintains high pressure and high temperature, improves the mixing efficiency of formalin and a catalyst to produce trioxane at a high yield in space and time, reduces side reactions to increase the production amount of trioxane, prevents local overheating in a reboiler, and prevents pipe clogging to enable continuous operation for a long period of time. In addition, the trioxane production equipment prevents the catalyst in the trioxane reactor from leaking to the next step, so that the corrosion of the equipment is reduced; and low-temperature high-concentration formalin supplied from the formalin supply source and high-temperature low-concentration formalin recovered from the trioxane distillation column are combined with the reaction mixture circulating through the main body and the reboiler of the trioxane reactor and supplied to the trioxane reactor, therefore, trioxane can be produced at the optimal reaction concentration and temperature.