2results about How to "Solve complex process" patented technology

The utility model discloses a kind of air pipe flanges with sealing gasket, including heat insulation section bar and sealing gasket, sealing gasket and heat insulation section bar are soft and hard coextrusion integrated structure;When two flanges butt joint are fixed, relative two flanges on sealing gasket are extruded up and down relatively.The utility model provides a kind of air pipe flanges with sealing gasket, in production stage, sealing gasket and insulation section bar are integrally formed, make it "pre-install" on flange, solve the complex process problem of artificial gasket in later construction, and standard part production can be formed, improve product quality.Under the premise of following installation method, optimization is carried out to order and production process.

The present application belongs to the technical field of wastewater treatment, and particularly relates to a method for recovering ammonium sulfate from aldehyde pyridine intermediate aldehyde pyridine wastewater. Dichloromethane is added to the aldehyde pyridine liquid, and the obtained ammonium acetate wastewater is extracted again with dichloromethane. The extracted ammonium acetate wastewater is subjected to light component removal under reduced pressure, and the water phase after light component removal is added with activated carbon. After stirring, the activated carbon is filtered out. Concentrated sulfuric acid is added dropwise to the water phase, and then the temperature is increased and the water phase is distilled under reduced pressure. Then the temperature is decreased, and the filter cake is washed with saturated ammonium sulfate aqueous solution. After drying, ammonium sulfate salt is obtained. The intermediate aldehyde pyridine is separated out, the intermediate wastewater is treated separately to recover ammonium sulfate, and the treatment process is avoided to be complicated due to impurities in the pymetrozine technical material wastewater. Meanwhile, economic benefits are generated by recovering ammonium sulfate. The ammonium sulfate recovered from the wastewater meets the national standard GB / T535-2020 for fertilizer-grade ammonium sulfate.