59 results about "Formaldehyde product" patented technology

The invention discloses a chromogenic formaldehyde adsorbing material and a preparation method thereof. The adsorbing material consists of a carrier, a high molecular organic amine polymer, a polylol polymer and a formaldehyde reaction indicator, wherein the high molecular organic amine polymer and the polylol polymer account for 1 to 50 percent of formaldehyde adsorbent, the formaldehyde reaction indicator is little, and the balance being the carrier. The preparation method thereof comprises the following steps: mixing the high molecular organic amine polymer and the polylol polymer according to mass, adding deionized water to dilute the mixture so as to prepare formaldehyde reagent; mixing the formaldehyde reagent and the formaldehyde reaction indicator; and spraying or dipping the mixed solution onto the surface of the carrier, and drying the carrier and so on. The adsorbing material and the preparation method can quickly, thoroughly and continuously remove formaldehyde pollution in indoor air until the content of the formaldehyde is reduced to safe concentration, are nontoxic, pollution-free, safe and environment-friendly to use, and can intuitively show the reaction degree of the formaldehyde.

The present invention relates to one improved silver process of producing formaldehyde. Produced gas with relatively high temperature and with heat from waste heat boiler is used as heat source for eliminating alcohol and water from formaldehyde mixture in the first absorption tower, and partial alcohol containing dilute formaldehyde solution is returned from some place in the second absorption tower in the absorption system with gradually lowered temperature to realize the dealcoholization-reutilization circulation. The process is simple, low in methanol consumption, low in investment and reasonable energy utilization, and the produced formaldehyde product has low alcohol content and high concentration.

The invention relates to a preparation method of pyridine-2-formaldehyde. The preparation method comprises the following two steps: preparing an acidity-regulator-containing supported catalyst with titanium dioxide used as a carrier, molybdenum bismuth oxide used as a main body and transition metal oxide used as an auxiliary, carrying out gas-phase oxidation reaction on 2-methyl pyridine, oxygen and water used as raw materials in a fixed bed catalytic reactor at 250-350 DEG C to obtain a crude pyridine-2-formaldehyde product, extracting the crude product with dichloromethane, carrying out pressure-reduced distillation on the extract to remove dichloromethane, and then rectifying to obtain a pure product with a pyridine-2-formaldehyde content more than 98%. The preparation method provided by the invention has the advantages of simple preparation process, high efficiency, low cost, high catalytic reaction activity and selectivity, easy separation of main products and by-products and high purity.

The invention discloses a natural benzaldehyde preparation method. According to the invention, one oxide or two or three composite oxides from V, Ti, Ag, Ba, and Mg can be taken as a catalyst, O2 or air is introduced as an oxygen source, cinnamaldehyde is atomized through compressed air or oxidation, and then is introduced into a fixed bed reactor, a gas-solid phase catalysis continuous reaction is carried out under normal pressure at the temperature of 120-200 DEG C, a product continuously passes through a molecular distillation apparatus, molecular distillation is carried out at the temperature of 60 DEG C under 100 Pa, and the natural benzaldehyde product is obtained. The natural benzaldehyde preparation method has the advantages of simple and novel process, simple operation, no requirement of solvent, simple separation, and fast reaction rate, excessive oxidation of cinnamaldehyde is prevented, a reaction process is environmentally friendly, the natural degree of benzaldehyde is good, and the product purity is high.

The invention discloses a method for preparing natural benzaldehyde. The method comprises the steps of gasifying cinnamyl aldehyde at the temperature of 260 DEG C in a manner of taking a composite oxide of two or three of Fe, Mo, W, Mn, Ca, Al, Cu and Zn as a catalyst and introducing O2 or air as an oxygen supply, then, enabling cinnamyl aldehyde gas to enter a fixed-bed reactor, carrying out a gas-solid catalytic continuous reaction, and subjecting a product to molecular distillation continuously through a molecular distillation device at the temperature of 60 DEG C under the pressure of 100Pa, thereby obtaining the natural benzaldehyde product. The method has the advantages that the process is simple and novel, the operation is simple, a solvent is not required to be used, the separation is simple and convenient, the reaction rate is high, the reaction process is environmentally friendly, the natural degree of the benzaldehyde is good, and the obtained product is high in purity.

The invention relates to a new process for producing glyoxal by using a complex silver catalyst to oxidize glycol. The process comprises the following steps: adopting a high-pressure steam-spraying and far-infrared combining heating mode to gasify glycol; uniformly mixing the gasified glycol, steam, preheated filtrated air and circulating air in a tertiary mixer before entering a grid-type oxidation furnace integrated with a feed gas-purifying and refining device and filled with an Ag-P-Se/ceramic catalyst; carrying out a catalytic oxidation reaction; rapidly quenching the reacted gas; sendingthe gas to an absorption tower for repeated absorption; and decoloring the gas to obtain a glyoxal product. The process uses the Ag-P-Se/ceramic catalyst with strong activity and has high glyoxal yield up to 85 percent and small impurity formaldehyde product; a grid-type supporting plate overcomes the defects of easily deformed and crack catalyst bed and decreases the resistance of the bed; and the process integrates the purifying and refining device and the oxidation furnace and adopts the high-pressure steam-spraying and far-infrared combining heating mode to gasify the glycol to save energy and shorten the process flows.

The invention discloses a device for continuous production of melamine-formaldehyde resin, and belongs to the technical field of chemical equipments. The device comprises a mixture bin, a material pump, a first screw machine, a static mixer and a second screw machine which are connected in sequence, wherein the mixture bin is connected with a melamine high-order bin and a paraformaldehyde high-order bin respectively, an alkali liquor feed inlet is formed in the feed end of the first screw machine, and auxiliary material feed inlets are formed in the feed end, the middle end or the tail end of the first screw rod. The production device disclosed by the invention is high in utilization rate of raw materials, low in energy consumption, high in yield, free of three wastes (waste gases, waste water and waste residues) in the production process of the melamine-formaldehyde resin, and can continuously produce the melamine-formaldehyde resin with stable quality, and furthermore, melamine-formaldehyde resin products are good in quality.

The present invention discloses a novel method by concentrating the diluted formaldehyde solution containing alcohol and eliminating the alcohol, belonging to the technological field of the concentration and elimination of the alcohol of the diluted formaldehyde solution containing alcohol; the diluted formaldehyde solution containing alcohol with the alcohol of 0.5 to 15 percent and the aldehyde of 1 to 30 percent is sent into the pressurization and rectification tower for rectification; the product with the formaldehyde concentration of 1.5 to 65 percent can be got on the top of the pressurization and rectification tower; the product on the bottom of the tower is the organic wastewater; the products on the top of the pressurization and rectification tower are sent to the heat exchanger and are cooled to be at the temperature between 80 and 120 DEG C; then the products are sent to the alcohol-doffing tower for the continuous rectification; the methanol solution with the concentration of 40 to 80 percent can be got on the top of the alcohol-doffing tower; the formaldehyde solution with the concentration of 2 to 67 percent can be got on the bottom. The present invention is of the large output and the high rectification efficiency; the formaldehyde can be diluted to have the concentration of the conventional formaldehyde product; at the same time, the separated methanol can be recycled used for the formaldehyde production and so on.

The invention relates to a preparation method of environment-friendly textiles capable of reducing formaldehyde. The method comprises the following aspects: 1 blocking hydroxymethyl, which is an effective method for reducing formaldehyde emission, and can be divided into the following steps according to different blocking time: (1) blocking in a product production process, and (2) blocking when crosslinking in use; 2 producing a low-formaldehyde product, when hydroxymethyl is etherified with low-level alcohols, the stability of a C-N bond can be improved; and (3) adding polyhydric alcohols to a finishing liquid, so as to reduce the formaldehyde emission to not higher than 400ppm. According to the preparation method, formaldehyde can be effectively reduced, and the environment-friendly textiles are produced.

The invention relates to a method for producing ultralow-acid formaldehyde. The method comprises the following steps: a, pumping 37% formaldehyde obtained by a catalytic oxidation reaction into a first anion exchange resin adsorption tower, adsorbing formic acid in the 37% formaldehyde by using weakly basic anion exchange resin in the first anion exchange resin adsorption tower, and conveying thefinished formaldehyde product obtained after the adsorption into a formaldehyde storage tank; b, timely switching a transfer pump to a second anion exchange resin adsorption tower (2) when the detected acid content of formaldehyde is equal to or more than 0.005%, continuously adsorbing the formic acid in the 37% formaldehyde by the weakly basic anion exchange resin, and conveying the finished formaldehyde product obtained after the adsorption into the formaldehyde storage tank; and c, regenerating the first anion exchange resin adsorption tower by a 3-5% NaOH solution in a forward flow manner,washing the first anion exchange resin adsorption tower with desalinated water, and continuously putting the regenerated first anion exchange resin adsorption tower into production and use. The method has the advantages of continuousness in production of the ultralow-acid formaldehyde, and meeting the needs of the market.

The invention discloses a flame-retardant textile and a flame-retardant adhesive for the flame-retardant textile and a preparation method of the flame-retardant adhesive. The flame-retardant adhesive is prepared from a waterborne white modified emulsion, a water-soluble polymer thickener, a foaming agent, a foam stabilizer, zinc borate, a halogen-free phosphorous nitrogen ammonia-based flame-retardant powder and softened water; the method comprises the steps of weighing a certain amount of softened water and waterborne white modified emulsion in a stirring tank; fully stirring, sequentially adding the foaming agent and the foam stabilizer; weighing the zinc borate, slowly and uniformly adding the halogen-free phosphorous nitrogen ammonia-based flame-retardant powder to a mixture, and stirring while adding; and adding the water-soluble polymer thickener, fully stirring, filtering and discharging to obtain the flame-retardant adhesive. By adopting the halogen-free phosphorous nitrogen ammonia-based flame-retardant powder, the flame-retardant adhesive does not contain halogen and does not cause secondary pollution to the air environment during combustion; since no formaldehyde is added, a product is more environment-friendly; the zinc borate plays a flame-retardant synergistic role as an auxiliary flame retardant; and the flame-retardant adhesive has the advantages of being simple in preparation technology, good in use effect and low in cost.

The invention relates to a method for producing a formaldehyde and urea formaldehyde pre-concentrated liquid. The method comprises steps as follows: S101: methanol is gasified and mixed raw gas is obtained; the mixed raw gas contains methanol with the concentration being 6%-11%, oxygen with the concentration being 9%-13% and the balance of inert gas; S102: the raw gas is sent into a reactor and subjected to a reaction at the temperature of 200-400 DEG C under the action of an iron-molybdenum catalyst; S103: a reaction product is sent into an absorption system to be absorbed by a preset solution, and the formaldehyde or urea formaldehyde pre-concentrated liquid is obtained finally. The provided process for producing oxidation-method (namely, an iron-molybdenum method) formaldehyde on a super-large scale has the outstanding advantages of being high in conversion rate, yield, product concentration and energy recovery degree, excellent in product quality, free of liquid wastes and solid wastes during normal production and the like and is particularly suitable for demands of the large modern chemical industry, the dilemma of extended monopoly of abroad iron-molybdenum method formaldehyde processes is thoroughly broken through, and the blank of the independent intelligent property right of the process in China is filled up.

The invention relates to the field of formaldehyde production technology, in particular to a low-conversion-rate high-yield formaldehyde production technology and device thereof. Reaction of ternary mixture with excessive methanol under action of catalyst is completed by controlling proportion of methanol in the ternary mixture, generated formaldehyde gas and other gases are cooled suddenly and fed into a primary absorption tower to be absorbed through process water, methanol-contained formaldehyde solution acquired from the primary absorption tower enters a first methanol removing device to be heated, methanol is removed in a gaseous state, the formaldehyde solution with methanol removed is used as finished formaldehyde products to be stored, the gaseous methanol removed by the first methanol removing device still contains formaldehyde in a small quantity so as to be fed into a secondary absorption tower to be absorbed and enter a second methanol removing device for removing methanol again, and the removed gaseous methanol enters a flame-retardant filter to enter a formaldehyde production system again for recycling reaction. The low-conversion-rate high-yield formaldehyde production technology has the advantages of low conversion rate, fewer negative reactions, low oxygen temperature control, long lifetime of catalyst, high yield and low material consumption.

The invention relates to an energy-saving formaldehyde production system which comprises an evaporator, a gas mixer, an oxidizing reaction tower, a steam separation tower, an adsorption tower and a tail gas recycling device. The evaporator is connected with the gas mixer, the gas mixer is connected with a steam source, an outlet of the gas mixer is connected with a steam inlet of the oxidizing reaction tower, and a steam outlet of the oxidizing reaction tower is connected with a steam inlet of the steam separation tower. A steam exhaust port of the steam separation tower is connected with an inlet of the adsorption tower, a tail exhaust port of the adsorption tower is connected with a tail gas recycling device, and the steam separation tower comprises a tower body. The upper portion in the tower body is provided with at least one piece of metal regular filler through a frame, a liquid suction disc is arranged on the lower portion of the metal regular filler, and a water circulating cooling pond is arranged on the lower portion of the liquid suction disc. A large amount of steam in a formaldehyde gas mixture can be effectively removed through the steam separation tower, and therefore the mass concentration of produced formaldehyde products can be effectively improved.

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 relates to a method for preparing concentrated formaldehyde from low-formaldehyde-content materials. The method includes steps: (1) adding methyl alcohol into the low-formaldehyde-content materials, and performing reaction under the catalysis action of a heteropolyacid catalyst to obtain dimethoxymethane; (2) subjecting dimethoxymethane obtained at the step (1) to catalytic oxidation to obtain products including concentrated formaldehyde, wherein a concentrated formaldehyde product being 65-66wt% in concentration is obtained finally, and the formaldehyde recovery rate in the whole process is 97% or above. The method has advantages that special equipment for concentrating of dilute formaldehyde into concentrated formaldehyde is not needed, so that cost saving and energy consumption reduction are realized; circulation of dilute formaldehyde in a device is realized, independence from production by-products such as dimethoxymethane, urotropin or the like is realized, and COD level of wastewater and wastewater treatment cost are reduced.

The present invention relates to a manufacturing method of a controlled natural biological odor-removal formaldehyde-removal product, a plant is put in ice, added with a solvent, put in a mortar for grinding with liquid nitrogen, and after grinding, the plant is put into an extracting liquid for standing in the ice for 3 ~ 4h, and centrifuged at a low temperature of 4 DEG C with a centrifuge in the rate of 11100rpm / 20min to extract a supernatant to obtain plant protein enzyme. The protein enzyme and water are mixed for preparation, and added into a plastic bottle, by use of a cylinder7mm *70mm porous enamel rod for suction floating and use of a top heater for continuous controlled evaporation at a certain temperature, the purpose of removal of indoor formaldehyde and odor can be achieved, and 95% of carbon monoxide, 99 % of formaldehyde, 95% of nitrogen peroxide, 90% of benzene and 92% of trichloro ethylene can be removed.

The invention discloses a UV-curing coating with formaldehyde-removing function. The UV-curable coating with formaldehyde-removing function is prepared from the following raw materials in parts by mass: the total mass is 100 parts, 15-35 parts of light-sensitive polymer; 10-25 parts of thermoplastic resin; 35-65 parts of photoactive monomer; 1-5 parts of photosensitizer; 1-8 parts of catalytic catalyst; 5-10 parts of filler; 0.1-5 parts of dispersing agent; 0-1 part of defoaming agent. The invention also discloses a method for producing formaldehyde-removing product by using the UV-curing coating, which comprises the following steps of: (1) coating a UV-curing coating on a substrate, and preheating the coating by using infrared light, wherein the preheating temperature is 50-130 DEG C, andthe preheating time is 5 seconds-5 minutes; (2) after the preheating, curing with the ultraviolet light. The invention also discloses a formaldehyde removal product produced by above-mentioned method. The UV-curing coating has the advantages of low viscosity, high light-curing speed and no volatile organic solvent.

The invention relates to the technical field of plywood, in particular to a zero-aldehyde adhesive for plywood and a preparation method of the zero-aldehyde adhesive. The zero-aldehyde adhesive for plywood comprises the following components in parts by weight: 10-20 parts of water glass, 5-15 parts of a promoter, 20-30 parts of sodium alginate, 10-20 parts of gelatin, 3-5 parts of sodium fluosilicate, 5-10 parts of a halogen-free flame retardant and 20-30 parts of cationic water. The adhesive is good in viscosity, does not contain formaldehydes products, does not release formaldehyde, methylbenzene, xylene or the like, and can reach fireproof A2 level; and poisonous gas or smoke is not discharged.

The invention discloses a preparation method of furan resin. The preparation method comprises the following steps: (1) preparing raw materials; (2) preparing modified lignin; (3) preparing a graphene dispersant; (4) putting solid formaldehyde and urea into a reaction kettle, and adding boric acid; (5) adding a graphene dispersing agent and furfuryl ketone, and carrying out a catalytic reaction; (6) adding a sodium hydroxide solution to adjust the pH value to 7-9, adding modified lignin, and reacting for 1 hour; (7) adding a coupling agent, and stirring; and (8) adding metal salt, and stirring to finally obtain a finished product. The solid formaldehyde and furfuryl ketone are adopted for reaction, formaldehyde generated in the generation process can be consumed, the free formaldehyde content of the product can be reduced to 0.09%, boric acid is added, the graphitization degree of furan resin is improved, the wear resistance and thermal shock resistance of the furan resin are improved, the brittleness of the furan resin is reduced, and the furan resin has good toughness and bonding strength.

The invention discloses modified nanosilica, a preparation method and an application in preparation of a formaldehyde-free product. The preparation method of the modified nanosilica comprises the following steps: adding 5-15 g of nanosilica to 90-120 ml of ethanol for ultrasonic dispersion for 1-3 h, adding 0.5-1.2 g of [3-(2-aminoethyl)aminopropyl]trimethoxysilane, 0.2-0.6 g of artemisinin and/orliquiritigenin, performing stirring for a reaction for 4-6 h, and performing drying. The modified nanosilica can realize effects of long-term sterilization, antibacterial performance and decomposition of harmful formaldehyde gas. The modified nanosilica has huge market space in preparation of the formaldehyde-free product.

The invention discloses a colorful urea-formaldehyde material. The colorful urea-formaldehyde material comprises urea-formaldehyde powder and also comprises pearl powder or glitter powder; and the urea-formaldehyde powder consists of urea-formaldehyde resin, filler, a lubricating agent, a stabilizer and a plasticizer. The invention also relates to a manufacturing method of a urea-formaldehyde product. The pearl powder or the glitter powder and an antibacterial material are added into the urea-formaldehyde powder, or the pearl powder or the glitter powder is added in the synthesis process of the urea-formaldehyde powder, so that the outer surface of the urea-formaldehyde product manufactured by the material has colorful effect, and the beautiful degree and the identification degree of the product are increased.

The invention discloses a 3,4-dihydroxybenzaldehyde purification and decolorization method, comprising the steps of: taking industrial 3,4-dihydroxybenzaldehyde as a raw material; taking a combined reducing agent as a decolorant, wherein the combined reducing agent is formed by proportionately combining solid chemicals such as magnesium powder, iodine-potassium iodide, polyacrylamide and disodium edetate; performing stirring and filtering to obtain filtrate; and cooling and crystallizing the filtrate, so that purified and decolorized 3,4-dihydroxybenzaldehyde is obtained. According to tests, a measured value of product purity of the 3,4-dihydroxybenzaldehyde obtained by using the method of the invention is greater than 99.5 wt%, and chromaticity of an aqueous solution with 20 wt% of 3,4-dihydroxybenzaldehyde is less than 100 (the platinum-cobalt method). The method of the invention has characteristics of having a good effect of purification and decolorization, being simple in post-processing, being stable and non-toxic and causing no secondary pollution. The method is low in decolorant consumption, low in cost, stable in product quality, environmentally friendly and suitable for industrial production.

Binder compositions are described that include at least one formaldehyde-containing compound, a cyclic urea-dialdehyde compound, and a polyamine compound. The polyamine compound may be selected from melamine and dicyandiamide. The weight ratio of the at least one formaldehyde-containing compound to the combined weight of the cyclic urea-dialdehyde compound and the polyamine compound may be greater than or about 1:1. As described are binder-containing fiberglass products that include glass fibers and a binder. The binder may include a formaldehyde polymer characterized by crosslinking with a cyclic urea-dialdehyde and a polyamine. The binder-containing fiberglass products have reduced formaldehyde emissions.