5results about "Ammonium salt preparation" patented technology

The invention discloses a cobalt carbonate wastewater recycling application method, belongs to the field of industrial wastewater treatment, and solves the problems of low ammonium chloride yield and high reagent consumption in the existing method. The method comprises the following steps: carrying out decarburization treatment, wherein the decarburization pH value is 6.01-6.05; carrying out two-stage de-weighting; the water subjected to weight removal enters an MVR evaporation system to be evaporated, and the water enters a falling film evaporator after being heated by a plate heat exchanger; the slurry enters a forced evaporator to be further evaporated and concentrated; the slurry enters a thickener and is circularly separated in the thickener, concentrated liquid enters a centrifugal separation procedure, hot steam is conveyed into a discharging conveying belt and a discharging pipeline in the salt discharging process of a centrifugal machine, drying is carried out while salt discharging is carried out, and ammonium chloride is obtained. According to the invention, the working procedures are improved, so that the operation process is greatly shortened, the energy-saving effect is obvious, the yield of ammonium chloride is increased by 15-20%, the consumption of hydrochloric acid is reduced by 30%, and the consumption of ammonia water is reduced by 10-15%.

This invention provides an integrated process for processing ammonium fluorosulfate, a by-product generated in the production of bis(fluorosulfonyl)imides. [Solution] A process for processing ammonium fluorosulfate byproducts includes providing an ammonium fluorosulfate byproduct mainly comprising ammonium fluorosulfate and smaller amounts of fluorosulfonic acid and bis(fluorosulfonyl)imide; mixing the ammonium fluorosulfate byproduct with water; reacting the mixture of ammonium fluorosulfate byproducts and water at a hydrolysis reaction temperature to hydrolyze ammonium fluorosulfate, fluorosulfonic acid and bis(fluorosulfonyl)imide to form ammonium bicarbonate and an aqueous hydrogen fluoride solution; and separating ammonium bicarbonate from the aqueous hydrogen fluoride solution.

The invention provides an ammonia chemical species desorption process capable of desorbing ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with the use of an aqueous solution of a salt or strong acid, and more efficiently as compared with the use of only water. This ammonia chemical species desorption process comprises an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species.         AxM[M' (CN) 6]y·zH2O ···     (1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M' are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.

The invention discloses a photoelectrocatalysis membrane electrode for nitrate nitrogen wastewater treatment, a preparation method of the photoelectrocatalysis membrane electrode and an ammonia recovery coupling integrated device, and belongs to the technical field of photoelectrocatalysis. The photoelectrocatalysis membrane electrode disclosed by the invention has a photoelectrocatalysis synergistic effect. The high dispersity of metal single atoms on carbon nitride enhances the adsorption and activation capability of the membrane electrode to nitrate, and meanwhile, improves the carrier separation efficiency and the photo-induced electron utilization rate, and can realize efficient and stable reduction of nitrate into ammonia with low energy consumption. The continuous flow type photoelectrocatalysis membrane reactor and the ammonia recovery device are integrated, nitrate wastewater is reduced into ammonia at a cathode after entering the photoelectrocatalysis membrane reactor, the ammonia flows out of the ammonia recovery device through a water outlet hole, the ammonia in the wastewater overflows from a hollow fiber membrane and is collected by acid, and the remaining wastewater is recycled to a wastewater pool again. The processes of nitrate photoelectric catalytic reduction and ammonia separation and recovery are realized.

This invention discloses iron-doped barium titanate nanoparticles and their application in piezoelectric catalytic nitrogen reduction. Iron, titanium, and barium sources are reacted in solution to obtain iron-doped barium titanate nanoparticles. These iron-doped barium titanate nanoparticles are then used to catalyze the reduction of nitrogen to produce ammonium ions (NH4). + This invention utilizes iron-doped barium titanate nanoparticles for piezoelectric catalysis of nitrogen reduction, exhibiting enhanced piezoelectric response and stable catalytic performance. Experiments demonstrate that barium titanate with a 3% iron doping ratio (Fe-BTO-3) achieves a nitrogen fixation and ammonia conversion efficiency of 66.72 μmol·g⁻¹. ‑1 ·h ‑1 (830 μmol·L) ‑1 ·g ‑1 ·h ‑1 This is far higher than the nitrogen fixation capability of currently reported piezoelectric materials.