31results about How to "Avoid problems such as corrosion" patented technology

The invention discloses a preparation method of anisaldehyde. The method comprises the following steps: by using anethole as a raw material, nano ferric oxide as a catalyst, hydrogen peroxide or sodium hypochlorite as an oxidant, and acetonitrile as a solvent, carrying out reaction at 30-90 DEG C; and after the reaction is finished, sucking out the catalyst (nano ferric oxide) by using a magneton, and drying the nano ferric oxide for repeated use. The method disclosed by the invention has the advantages of simple technique, mild reaction conditions, low cost, environmental friendliness and the like, and the catalyst can be easily separated and recycled.

The invention discloses a nitrogen purging-assisted organic exhaust gas recycling method through the pressure swing adsorption of adsorbent resin. The organic exhaust gas recycling method comprises the following steps: (1) adsorption, namely performing adsorption when exhaust gas including volatile organic compounds (VOCs) enters an adsorber filled with the macroporous adsorption resin by a gas collection system; (2) desorption, namely vacuumizing the adsorbent resin in the adsorber and purging the adsorbent resin by using nitrogen in an auxiliary manner to desorb the adsorbed VOCs from the adsorbent resin to obtain the desorbed gas; and (3) recycling, namely condensing or absorbing the desorbed gas to recycle the VOCs. The adsorbent adopted by the method disclosed by the invention is the macroporous adsorption resin, the surface of the macroporous adsorption resin has no catalytic performance and has the characteristics of being easy to regenerate, high in mechanical strength, great in volumetric adsorption capacity and the like. A adsorption technique assisted by nitrogen purging in vacuum at normal temperature is high in adsorption efficiency and has the very excellent recycling effect on VOCs gas which can be easily oxidized and hydrolyzed or is high in solubility.

The invention discloses a biomass particle combustion apparatus and a combustion method for the same. The apparatus comprises a vertical type hearth, a feeding pipe is arranged above the hearth, the feeding pipe is connected with an external charging device, and the hearth is internally provided with an ignition device. The apparatus is characterized in that the hearth is internally provided with an ash damper; a rotary ash fork is arranged at the center of a flat furnace bottom plate at the bottom of the hearth; an ash falling port communicated with an ash box is arranged at the bottom side face of the hearth right below the ash damper; one side of the hearth is provided with a fire tube communication port connected with an internally communicated fire tube so as to form a combustion area, the bottom and both sides of the ash damper are all connected with the internal wall of the hearth, the bottom of the ash damper extends upwards from the lower end of the fire tube communication port and the top of the ash damper is higher than the upper end of the fire tube communication port, and a secondary air spray pipe communicated with a secondary air channel is arranged in the fire tube.

The invention discloses sewage treatment sludge active carbon having continuous pore size distribution, and a preparation method thereof. According to the preparation method, ZnCl2, phosphoric acid, K2S and NaCl form a compound activator in anoxic atmosphere to activate sludge, wherein the mesoporous structure is developed mainly by using the phosphoric acid, and the K<+> content and the Na<+> content of the sludge active carbon are increased so as to easily enhance the replacement with heavy metal ions in sewage; and activation is performed with water vapor to generate rich micro-pores in the mesoporous surface, such that the BET specific surface area of the finally obtained sludge active carbon is not less than 400 m<2> / g, and the pore size is continuously distributed within 0.5-50 nm. According to the present invention, the prepared sludge active carbon adopted as the sewage treatment adsorbent adsorbs heavy metal ions using Pb<2+> as the representative and macromolecular pollutants in the sewage, and has good effects.

A surface-active method of metal material for medical use. It adopts three poles system. Negative pole is metal material. Positive pole is inert material. Fit them and reference electrode to electrolyte solution containing supported electrolyte solution. Soluble calcium salt and phosphate at pH2.5-6.5.Hold negative potential to be at -1 to -4V by way of constant potential or apply to electronic current 1-5Ma at constant value for 2 to 20min. Get sample of negative pole, wash and dry it.