2results about How to "Realize closed loop" patented technology

The invention relates to an integrated recovery process of aromatic hydrocarbons in hydrogen peroxide oxidation tail gas, which specifically comprises the following steps: preheating the oxidation tail gas to 95-115 DEG C, introducing the oxidation tail gas into an adiabatic expansion machine for adiabatic expansion, reducing the pressure to 0.1-0.15 MPa, suddenly reducing the temperature to 3-7 DEG C, realizing energy recovery and power generation by using the Joule-Thomson effect, and condensing and separating out most aromatic hydrocarbons; and the condensed tail gas enters the activated carbon adsorption tower for deep adsorption, so that the aromatic hydrocarbon content in the finally discharged tail gas is less than or equal to 70mg / m. Through cooperation of process units, efficient recovery of aromatic hydrocarbons (the total recovery rate is greater than or equal to 95%), self-sufficiency of energy and even negative energy consumption operation (the unit tail gas treatment energy consumption is-5-0 kW.h / 1000 m) are realized, the stability and economical efficiency of an adsorption system are remarkably improved, and the technical problems of high energy consumption, low recovery rate and poor adsorption stability of a traditional cooling and adsorption process are solved.

The present application relates to a kind of resourceful treatment method of ammonium chloride crystallization mother liquor dry salt, belong to the waste residue processing technical field of ion type rare earth hydrometallurgy field.The present application uses adsorption technology and chemical precipitation method, step by step separates pollutants from waste residue, produces calcium sulfate, calcium carbonate, the crystalline precipitate of ammonium magnesium phosphate, carries out solid-liquid separation, and then converts evaporation salt into high-purity ammonium chloride solution.The present application is suitable for the treatment of ammonium chloride crystallization mother liquor dry salt with different proportions of various components, according to the solubility product constant of sulfide precipitation, calcium sulfate, calcium carbonate, ammonium magnesium phosphate is very small, step-by-step precipitation method is used to separate impurity elements in salt, strictly control process parameters, realize the transformation of ammonium chloride crystallization mother liquor dry salt to high-purity ammonium chloride solution, the existing precipitation and adsorption material in step is easy to solid-liquid separation, process technology is simple, easy to operate control, chemical reagent consumption is less, and salt treatment cost is low.