3 results about "Diammonium carbonate" patented technology

This invention relates to a method for recovering ammonium components during the production of sodium bicarbonate from sodium sulfate, belonging to the field of chemical production technology. The recovery method includes: pretreating a crystallization mother liquor containing sodium sulfate, ammonium sulfate, ammonium bicarbonate, and diammonium carbonate, then mixing it with sodium sulfate and crystallizing to obtain a liquid-solid mixture; separating fine particles from coarse crystals in the liquid-solid mixture to obtain a coarse crystal slurry and a slurry containing fine particles, respectively; performing solid-liquid separation on the obtained coarse crystal slurry to obtain a double salt and a filtrate; and mixing the obtained double salt with a solution for washing to obtain solid sodium sulfate and a solution of ammonium sulfate. The recovery method provided by this invention has advantages such as a short process flow, simple operation, and no environmental pollution risk. This method not only avoids high-temperature ammonia stripping and low-temperature freezing processes, reducing investment and operating costs and energy consumption, but also improves the ammonia recovery rate and enhances raw material utilization efficiency.

The present application relates to a positive electrode material, a method for preparing same, and use thereof. The method of the present application comprises the following steps: providing a metal salt solution comprising Ni2+, Co2+, Mn2+, and Al3+; dropwise adding a precipitant solution to the metal salt solution, so as to give a lactate precursor, the precipitant solution comprising lactic acid and ammonium carbonate; and co-sintering the lactate precursor and a lithium source. The method of the present application can achieve precise control of the molar proportions of nickel, cobalt, manganese, and aluminum to prepare a positive electrode material having a qualified chemical composition.

The present invention provides a hair treatment agent that can suppress the decrease in hair strength (firmness, resilience, resistance to breakage, and combability) caused by dyeing and bleaching treatments, while simultaneously suppressing the generation of unpleasant odors in the hair caused by these treatments. [Solution] A hair treatment agent used in mixture with a second agent containing hydrogen peroxide, comprising a carboxylic acid or a salt thereof and an alkaline agent, wherein the carboxylic acid is tartaric acid, the content of the carboxylic acid or salt thereof is 0.001 to 5% by mass, the alkaline agent is at least one selected from the group consisting of ammonia, diethanolamine, and aminomethylpropanol, and further contains a pH buffer, the pH buffer is a carbonate selected from the group consisting of ammonium bicarbonate, ammonium carbonate, sodium bicarbonate, sodium carbonate, potassium bicarbonate, and potassium carbonate, and the pH is 8.5 to 11.5.