51 results about "Formaldehyde synthesis" patented technology

The invention relates to a method for modifying melamine foam, which comprises the following steps of: adding an emulsifier, a foaming agent, a curing agent and other aids into a base material, namely melamine formaldehyde resin synthesized by melamine and formaldehyde in a low molar ratio, adding melamine and one or more hydramine compounds, and uniformly emulsifying; heating and foaming at certain temperature for a certain period of time through microwaves in a microwave oven; and curing at high temperature, and processing and forming. In the process of foaming through the microwaves, the melamine or the melamine formaldehyde resin and the hydramine compounds can generate a compound capable of improving the performance of foam at high temperature under the action of the microwaves, and the foam is modified at the same time, so that the aim of improving the performance of the melamine foam is fulfilled.

The invention discloses an iron-molybdenum catalyst for formaldehyde synthesis through methanol oxidation. The iron-molybdenum catalyst consists of an active metal oxide, an assistant metal oxide and a binder metal oxide, wherein the molar ratio of Mo to Fe to V to assistant metal to binder metal is 1:(0.33-0.67):(0.001-0.1):(0.001-0.1):(0.01-0.5). The iron-molybdenum catalyst has the advantages of low cost, long service life and low calcination temperature and reaction temperature.

The invention relates to a method for synthesizing and preparing 2-vinyl pyridine by synthesizing 2-methyl pyridine and formaldehyde, which comprises the following steps of: adding the raw materials 2-methyl pyridine and formaldehyde (36%) into a high pressure reactor according to the weight ratio of 1: 0.03, stirring and heating for reaction to obtain 2-hydroxyethyl pyridine solution; slowly adding the obtained 2-hydroxyethyl pyridine solution into a dehydration kettle filled with sodium hydroxide (50%) solution through a measuring tank (1 ton) to obtain the crude product 2-vinyl pyridine; and sending the obtained crude product 2-vinyl pyridine into a washing kettle through a pipeline, adding sodium hydroxide (95%) solution into the washing kettle, and carrying out cut fraction on the crude product 2-vinyl pyridine which is separated by washing to obtain the 2-vinyl pyridine with the gas phase chromatography test content of more than 98.5%. The method adopts novel catalyst, so that the unit comprehensive energy consumption is reduced by 20%; the production process is automatically controlled, the product purity is greatly improved, and the product content reaches up to more than 98.5%; and the whole process route is clean and environment-friendly.

The invention relates to a process for the synthesis of polyoxymethylene dimethyl ether from methyl, solves the problems of low cost and high yield in the synthesis of polyoxymethylene dimethyl ether. The process for the synthesis of polyoxymethylene dimethyl ether from methyl is divided into a reaction zone and a separation zone; the reaction zones includes a methanol storage tank, a preheater, a fixed bed reactor and a bubbling reactor; the process is the reaction zone is as below: methanol by is preheated, vaporized, mixed with air and sent into the fixed bed reactor, the methanol is subjected to catalytic oxidation under the action of a formaldehyde synthesis catalyst to generate formaldehyde; the formaldehyde enters into the bubbling reactor and reacts with methanol and a recycled mixture under the catalysis of a solid acid catalyst to form polyoxymethylene dimethyl ether. The separation zone includes an anion exchange resin bed, a rectification module and a product storage tank; and the process steps in separation zone are as below: the material discharged from the bubbling reactor passes through the anion exchange resin to remove acid and enters into the distillation separation module, trimer and tetramer of polyoxymethylene dimethyl ether enter into the product storage tank, and other components are recycled to the reactor. The technical scheme can be used in polyoxymethylene dimethyl ether production.

The invention relates to an iron-molybdenum method formaldehyde synthesis catalyst, and a preparation method thereof. According to the invention, an auxiliary agent which is a nickel oxide is added into an iron-molybdenum two-component catalyst system; a co-precipitation reaction speed is controlled, such that the obtained catalyst has a wide pore size distribution, while the proportion of mesopores is relatively large; and macropores are artificially produced, such that the catalyst is prepared. During a catalytic reaction process, the prepared catalyst is beneficial for heat and mass transfer, and assists in improving formaldehyde and methanol conversion rate. The catalyst has good thermal stability and a long service life.

The invention discloses a preparation method of a super heavy oil refined oil-soluble efficient electro-desalting demulsifying agent, which comprises the steps of synthesizing phenol amine resin; performing condensation reaction of the phenol amine resin with epoxy propane and ethylene oxide sequentially to obtain block polyether; synthesizing thermoplastic phenolic resin by use of phenol, hydrochloric acid and formaldehyde; finally, performing a phenolic resin graft modification reaction between the obtained thermoplastic phenolic resin and the block polyether to obtain a product of super heavy oil refined oil-soluble efficient electro-desalting demulsifying agent. By adopting the preparation method disclosed by the invention, the oil-soluble efficient electro-desalting demulsifying agent can be efficiently prepared, the production cost is reduced, and the utilization rate of raw materials is improved; the demulsifying agent produced by the method can remarkably increase the desalting and dehydration speed of super heavy oil, saves the limited time and can effectively compensate for the shortcomings of a super heavy oil treatment process of a processing device.

The invention relates to a method which uses non-toxic, tasteless and non-volatile glyoxylate to replace formaldehyde for composing polyvinyl acetal acid safe adhesive. The acetalation degree can be controlled in 20 to 40 percent by adjusting the usage mol ratio of polyvinyl alcohol to glyoxylate is 1 to 0.1-0.2. The polyvinyl acetal acid adhesive can self dry and film under normal temperature, the adhesive film does not dissolve in water after drying, and the adhesive is applicable for conglutinating paper products, building materials and fibers.

The invention provides sustained and controlled release fertilizers which are urea formaldehyde (UF) sustained-release fertilizers. The fertilizers are chemical type sustained-release fertilizers synthesized from urea and formaldehyde. According to a production process of the fertilizers, through the control over the reaction conditions such as raw material ratio, pH value, temperature and reaction time, sustained-release fertilizers with different effect periods can be produced. That is to say, fast-acting, medium-acting and long-acting sustained-release fertilizers can be produced. Therefore, fertilizer deficiency during a seedling stage is prevented, plant growth is vigorous, fertilizer shortage in a late stage is prevented, and yield improvement can be realized. Through the regulation upon the production process, various products with fertilizer effects of 50-60 days, 90-120 days and more than one year can be produced; and fertilizer utilization rate can be improved by more than 1 time. The fertilizers can be widely applied in agriculture, forestry, urban greening, and engineering greening. The fertilizers can be used independently, can be used with other fertilizers, and can be prepared into various compound fertilizers. The production process is simple and feasible, and has the advantages of low investment, fast effect, sufficient raw materials, and vast market.

The invention discloses a sulfation binary metallic oxide solid acid catalyst. The composition components are iron oxide, zinc oxide and sulfation oxide; the sulfation oxide comprises sulfation iron oxide or sulfation zinc oxide. The raw materials used for the sulfation binary metallic oxide solid acid catalyst are simple and easy to obtain, the production cost is low, the preparation process is simple, and the corrosivity to equipment is low; under the condition of high water content, the catalytic activity for polyoxymethylene dimethyl ether synthesis through methyl alcohol and formaldehydeis high, the conversion rate of the reactant methyl alcohol is high, the selectivity for the product PODE 3-5 is high, and the stability of the catalyst is high; under the optimal reaction condition,the conversion rate of methyl alcohol in a reaction raw material is 54.96%, and the selectivity for the PODE 3-5 is 28.18%.

The invention discloses a preparation method of a nanometer solid super base catalyst applied to the synthesis of acrylic acid by utilizing acetic acid and formaldehyde. The preparation method comprises the following steps of preparing monodisperse spherical nanometer silicon oxide grains by taking silylating reagent as a raw material and ammonia water as a catalyst and reasonably controlling reaction conditions; preparing impregnation liquid by utilizing a certain of CsOH, adding a carrier to impregnate for a while, drying the impregnation liquid by distillation in a water bath manner, drying in a drying oven at a certain temperature, putting a dried mixture in a muffle furnace to roast for a while at the controlled temperature, and obtaining the fresh load-type nanometer solid super base catalyst. The nanometer solid super base catalyst prepared by the method disclosed by the invention contains nanometer SiO2, so that the poison tolerance of the solid super base catalyst is improved and the stability is better; and the preparation method disclosed by the invention has the advantages of simple experimental devices, simple catalyst preparation process, low requirements on preparation devices, high catalyst activity and the like during preparation.

The invention discloses a catalyst for synthesizing methyl acrylate from methyl acetate and formaldehyde and a preparation method of the catalyst. The preparation method mainly comprises the following steps: (1) washing a carrier with water, putting into a drying oven for drying at 120 DEG C, and then roasting in a muffle furnace at 300-500 DEG C for 2-8 hours; and (2) respectively weighing compounds containing active components Al and Cs, preparing into a solution with a certain concentration, fully impregnating the active components for 2-24 hours according to an equivalent-volume impregnation mode, drying at 60-150 DEG C for 4-15 hours, and finally, roasting the components in a muffle furnace at 400-650 DEG C for 2-8 hours to obtain the catalyst. The catalyst provided by the invention is an acid-base bifunctional catalyst, can effectively improve the selectivity and conversion rate of the product, and has high carbon deposition resistance; and the preparation method of the catalyst is simple and easy to implement, and is suitable for large-scale industrial application.

A process is disclosed for the synthesis of formaldehyde from methane starting with the oxychlorination of methane to produce methylene chloride. Hydrolysis of methylene chloride yields the product formaldehyde. Byproduct chloroform and carbon tetrachloride are recovered and hydrogenated to provide additional methylene chloride.

The invention relates to a preparation method of cyclic trimethylolpropane formaldehyde (CTF or MCF), mainly aiming at solving the problems in the prior art that synthetic conditions of trimethylolpropane formal are harsh, a process route is complicated, the purity of a product is low and the APHA color number is high. The preparation method comprises the following steps: taking trimethylolpropane(TMP) as a raw material, and mixing TMP, aldehyde, a solvent, a catalyst and an auxiliary agent according to a certain ratio; reacting at 60 to 120 DEG C for 0.1 to 6h; evaporating under low pressure, filtering and rectifying to obtain a cyclic trimethylolpropane formaldehyde product with the quality purity being greater than or equal to 98 percent and the color number APHA being less than or equal to 20. By adopting the preparation method provided by the invention, the problems are solved relatively well; a synthesis technology is simple and conditions are moderate, so that the preparation method can be widely applied to large-scale industrial production.

The invention provides a corrosion-resistant phenolic resin coating and a preparation method thereof, and the preparation method comprises the following steps: adding corrosion-resistant phenolic resin and epoxy acrylate into xylene, and carrying out high-speed shearing dispersion to prepare a dispersion liquid B; adding pentaerythritol, polyvinyl butyral, talcum powder, glass powder, turpentine and hexamethylenetetramine into the dispersion liquid B, heating, stirring and dispersing, cooling to room temperature, and grinding to obtain the corrosion-resistant phenolic resin coating. Wherein the corrosion-resistant phenolic resin is synthesized from polyacrylic acid, 4-hydroxybenzylamine and formaldehyde. The corrosion-resistant phenolic resin has good thermal stability, and the prepared corrosion-resistant phenolic resin coating has good corrosion resistance, flexibility and impact resistance.

The invention relates to a synthesis method of methylal, and belongs to the technical field of chemical product preparation. The synthesis method comprises the specific steps: pumping formaldehyde into a formaldehyde synthesis tower by a formaldehyde feeding pump, mixing with methanol coming from a methanol measuring tank and pumped by a methanol feeding pump, and carrying out a reaction to generate methylal under the action of a catalyst in a reactive rectifying tower; adjusting the feeding ratio and the feeding amount to control the purity and the yield of the product, adjusting the reaction temperature to control the reaction speed and the content of effective substances in waste water, and ensuring to reach waste water discharge requirements; and taking out the product gas from the top of the reactive rectifying tower, and cooling the product by utilizing two condensers connected with each other in series. The method is simple in operation, low in consumption of the raw materials, and high in conversion rate; and the product is qualified and discharged at a time, and has stable quality.

The invention relates to an environment-friendly synthesis method of p-methoxybenzaldehyde, which uses p-hydroxybenzaldehyde as a raw material, uses polar solvent water as a solvent in the temperature range of 130-180°C, and uses Y-type zeolite, an alkaline substance, as a solvent. Catalyst, and add appropriate surfactant Turkish red oil to make emulsifier etc. under specific conditions, prepare p-methoxybenzaldehyde with environment-friendly dimethyl carbonate (DMC) as methylation raw material, and its yield reaches more than 96% , The purity of the final product reaches more than 99%.

The present invention relates to a process for producing coated silver catalysts. The invention further addresses the silver catalysts themselves and the advantageous use thereof in formaldehyde synthesis.

The invention discloses a method for accurately installing formaldehyde synthesis tower internals. The method comprises the following steps: 1, pre-installing the internals: arranging auxiliary mounting devices between tower trays, wherein the auxiliary mounting devices comprise an upper fixing and adjusting device, a connecting supporting leg adjusting device, a longitudinal sliding adjusting device and a radial sliding adjusting device which are connected in sequence, the internals are clamped and fixed on the radial sliding adjusting device through fastening pieces of the radial sliding adjusting device, the radial sliding adjusting device adjusts the radial sizes of the synthesis tower internals according to the internal size of the formaldehyde synthesis tower, the connecting supporting leg adjusting device adjusts the distance between the internals and the coaxiality of the internals through an adjusting rod, and the internals are fixed through fastening bolts after the auxiliarydevices position the positions of the internals; welding pipelines in the tower; filling with a catalyst; and integrally closing the tower, and performing pressure test. The method for accurately installing formaldehyde synthesis tower internals is simple and low in cost.

The invention discloses a preparation method of a medical intermediate 8-chloro-1, 7-naphthyridin-3-formaldehyde and belongs to the field of synthesis and preparation of medical intermediates. The preparation method comprises the following steps: step 1) dissolving a compound I 8-chloro-1, 7-naphthyridin-3-formate as an initial raw material in a solvent, and under the catalysis of Lewis acid, performing reduction to obtain 2-chloro-1, 7-naphthyridin-3-methanol, namely a compound III, and 2) carrying out TEMPO oxidation on the compound III 2-chloro-1, 7-naphthyridin-3-methanol to obtain 8-chloro-1, 7-naphthyridin-3-formaldehyde, namely a compound II. The preparation method disclosed by the invention is suitable for industrial production, relatively low in cost and simple to operate, and canbe used for producing active compounds of various novel immunomodulators.