Method for preparing diaminodiphenyl ether based on continuous catalytic hydrogenation of trickle bed reactor

The invention relates to a method for preparing diaminodiphenyl ether based on continuous catalytic hydrogenation of a trickle bed reactor, which adopts a supported nickel-based catalyst and adopts a filling mode that an upstream part is filled with a nickel-based catalyst with higher nickel content and a downstream part is filled with a nickel-based catalyst with lower nickel content in a catalyst bed layer. Thermodynamic equilibrium is achieved by utilizing reaction heat generated by catalytic hydrogenation reaction, on one hand, reaction energy consumption is reduced, and on the other hand, reaction risks caused by violent heat release and generation of other by-products can be avoided; besides, by optimizing and controlling the operation conditions of catalytic reaction temperature, reaction pressure and air speed, the generation of byproducts such as nitro incomplete hydrogenation, hydroxylamine condensation and amino azotization is effectively inhibited, and the reaction conversion ...

Method for treating residual liquid after mother liquor distillation methanol recovery during production of sodium sulphoxylate by sodium formate process

The present invention is process of treating mother liquid residue from sodium formate method to produce sodium hyosulfate and after being rectified to recover methanol. The process includes the following steps: 1. concentrating to obtain concentrated residue with or without sodium formate recovery; 2. incinerating the concentrated residue in a converter or one combined furnace to obtain incinerated clinker; 3. discharging high temperature clinker; 4. dissolving the clinker to form water solution; 5. absorbing SO2 from the incinerating fume with the water solution; and 6. adding sulfur to the absorbed solution to prepare sodium thiosulfate. The process can eliminate pollutant while producing sodium thiosulfate as chemical material.

Treatment method of waste potassium carbonate solution during production process of hydrogen peroxide solution by anthraquinones method

Method for treating residual liquid after mother liquor distillation methanol recovery during production of sodium sulphoxylate by sodium formate process

The present invention is process of treating mother liquid residue from sodium formate method to produce sodium hyosulfate and after being rectified to recover methanol. The process includes the following steps: 1. concentrating to obtain concentrated residue with or without sodium formate recovery; 2. incinerating the concentrated residue in a converter or one combined furnace to obtain incinerated clinker; 3. discharging high temperature clinker; 4. dissolving the clinker to form water solution; 5. absorbing SO2 from the incinerating fume with the water solution; and 6. adding sulfur to theabsorbed solution to prepare sodium thiosulfate. The process can eliminate pollutant while producing sodium thiosulfate as chemical material.