197 results about "Methyl red" patented technology

A ceramic article is disclosed which contains aluminum, silicon, and titanium in a total amount of at least 99% by weight as reduced to the oxides (Al2O3+SiO2+TiO2) and assumes an acidic color in methyl red, an indicator of at least pKa+4.8. It can be used as a carried for a catalyst. This ceramic article is obtained by mixing an aluminum compound, a silicon compound, and a titanium compound and calcining the resultant mixture at a temperature in the range of 1,000°-2,000° C. A catalyst for preparing ethylene oxide is obtained by depositing silver and a reaction promoter on the ceramic carrier and ethylene oxide is obtained by oxidizing ethylene with a molecular oxygen-containing gas in the presence of the catalyst in vapor phase.

The invention relates to a pH indicating material, prepared pH indicating silica gel cat sand and a production method thereof, wherein the pH indicating material can indicate whether a pH value of peturine is within a normal range. The silica gel cat sand containing the pH indicating material is a mixture of the pH indicating material and basic silica gel, wherein the pH indicating material accounts for 1-15 percent of the gross weight of the mixed silica gel cat sand, the pH indicating material uses silica gel as a carrier and contains a pH mixed indicator accounting for 0.025-2 percent of the gross weight of the pH indicating material and a water soluble polymer accounting for 0.5-20 percent of the gross weight of the pH indicating material, and the proportion by weight of methyl red and bromothymol blue in the pH mixed indicator is 1:12-1:1. Because the consistency of the pH indicating material and the basic silica gel in the materials is ensured, the pH indicating material in catsand products is uniformly distributed and can sensitively and stably indicate the acidity-basicity of the cat urine. The pH indicating material has low production cost, no toxin, no radioactivity, simple and easy preparation process as well as attractive appearance and color.

The invention discloses a method for determining the content of residual lithium carbonate and lithium hydroxide on the surface of a positive electrode material. The method comprises the following steps: accurately weighing a positive electrode material sample in a conical bottle by an electronic scale, and then weighing deionized water to be added, wherein the mass ratio of the positive electrodematerial sample to the deionized water is 3 to 10; adding a magnetic stir bar, introducing nitrogen to discharge the air in the conical bottle, performing low-speed stirring on a magnetic stirrer with the magnetic stir bar, and then performing suction filtration; accurately removing 10ml of the filtrate obtained in the step I by a pipette, placing the filtrate in the conical bottle, adding a dropof 0.1 percent phenolphthalein indicator in order that the color of the solution becomes pink, titrating the solution with a 0.01mol / L hydrochloric acid standard solution until the pink solution is completely turned into a colorless solution, recording the dosage of hydrochloric acid (V<1>), and adding two drops of 0.1 percent methyl red indicator into the colorless solution obtained in the stepII in order that the solution is yellow; continuing to titrate with the standard hydrochloric acid solution until the solution turns red, and recording the dosage of the hydrochloric acid (V<2>); andcalculating the result. The method has the advantages of accurate testing and low cost.

The invention relates to a method of detecting surface lithium of a ternary cathode material. The method includes stirring and mixing a ternary cathode material sample and water, filtering the mixture to obtain filtrate that is a solution to be detected, adding a phenolphthalein indicator into the solution to be detected, titrating the mixture with a standard hydrochloric acid solution until the mixture is colorless, recording the volume V1 of the consumed standard hydrochloric acid solution, then adding a methyl red indicator into the mixture, titrating the system with a standard hydrochloric acid solution until the color is turned from yellow to orange, heating and boiling the system to allow the color to be turned back from the orange to yellow, cooling the system to room temperature, titrating the system with the standard hydrochloric acid solution until the system is reddish that is adopted as a terminal point, recording the volume V2 of the consumed standard hydrochloric acid solution in the whole titrating process, and calculating the surface lithium content of the ternary cathode material according to a formula (1). According to the method, the surface lithium content of the ternary cathode material is detected through selecting the indicators and through an acid-base titration process, influences of an intermediate that is LiHCO3 on titration data are taken into full consideration, the surface lithium content measuring error of the acid-base titration process is reduced and detection accuracy is improved.

The invention relates to a method for preparing resin with high absorptive for soiless culture. Prepare the mixed solution of methacrylic acid and acrylamide, add into calcium hydroxide, potassium hydroxide, sodium hydroxide or ammonium hydroxide to adjust the PH value of 6-8, then add into cross linking reagent which is 0.01%-1% of acrylic acid monomer mass, then add into initiator and additive and colours med, such as carmine, rhodamine, blue,methyl red and grape purple, wait for the synthesizing reaction in 25-55deg.C for 3-5h, generating the colourful resin with high absorptive whose water absorption time is 40-80