4 results about "Formaldehyde product" patented technology

The application relates to a composite film material, a urea-formaldehyde product and a preparation method thereof, and a toilet bowl. The composite film material comprises a modified film material, the modified film material comprises a reinforcing cloth and a PVB matrix coated on the surface of the reinforcing cloth and filled in the reinforcing cloth, the total thickness of the modified film material is 0.1mm-2mm, the modified film material is provided with a plurality of through holes arranged in the thickness direction, and the diameter of each through hole is 1mm-5mm; the grammage of the reinforcing cloth is 10g / m 2 ~120g / m 2 ; the material for preparing the PVB matrix comprises PVB 85-92 parts and a plasticizer 8-15 parts in mass fraction, the total mass fraction of the PVB and the plasticizer is 100 parts, and the viscosity of a 10% PVB ethanol solution at 20 DEG C is 30s-120s. The composite film material has high hardness and high impact resistance, is applied in the urea-formaldehyde product, and is favorable for improving the impact resistance of the urea-formaldehyde product.

This invention discloses a green and energy-saving formaldehyde production system and method. Methanol is fed into a methanol buffer tank, then sequentially preheated in a dehydrogenation feed preheater, a dehydrogenation evaporator, and a first preheater to 210-260°C. After being heated, it enters the dehydrogenation reactor for a dehydrogenation reaction in the presence of a catalyst. The reaction liquid sequentially enters the first preheater and the dehydrogenation feed preheater to recover heat, and then sequentially enters a condenser and a dehydrogenation separator for gas-liquid separation. The liquid phase sequentially enters a preheater, a dryer, a light tower, and an aldehyde tower for separation to obtain formaldehyde product. The remaining liquid enters an alcohol tower to recover formaldehyde. The gas phase sequentially enters a dehydrogenation condenser, a compressor, and a pressure swing adsorption unit to obtain hydrogen. This invention produces hydrogen as a byproduct, which is used as an energy output, making it a green and energy-saving production process. Furthermore, the addition of water vapor reduces the occurrence of side reactions such as dimethyl ether and carbon buildup.

This invention relates to a method for purifying terephthalaldehyde. More specifically, this invention relates to a method in which crude terephthalaldehyde is subjected to centrifugal chemical extraction to react impurities such as organic carboxylic acids into carboxylate salts, which then enter the aqueous phase. The separated oil phase is then subjected to distillation and melt crystallization to remove trace impurities such as benzaldehyde and p-methylbenzaldehyde, thereby obtaining high-purity terephthalaldehyde. This invention combines centrifugal chemical extraction and vacuum distillation coupled with melt crystallization, which can efficiently obtain high-purity terephthalaldehyde products. Because the purification process does not use organic solvents, it reduces wastewater pollution to the environment and has good prospects for industrial application.

The application provides a methanol oxidizer, which comprises an oxidizer shell, the oxidizer shell comprises a feeding section, a catalytic section, a cooling section and a discharging section connected in sequence from top to bottom; one end of the catalytic section towards the feeding section is provided with an auxiliary heating mechanism, and the other end is provided with a catalytic reaction mechanism; the auxiliary heating mechanism comprises a heat collecting cover arranged in the catalytic section and a breather pipe arranged on the heat collecting cover and towards the catalytic reaction mechanism, one end of the breather pipe extending into the heat collecting cover is in communication with the heat collecting cover, and the other end is in communication with the catalytic section. The methanol oxidizer can realize efficient heating of raw material gas entering the catalytic section by arranging the auxiliary heating mechanism at one end of the catalytic section towards the feeding section, so that the raw material gas and the catalyst can react at high temperature, the reaction effect of the raw material gas and the catalyst is improved, the loss of the raw material is reduced, and the quality of the formaldehyde product is improved.