37 results about "Caesium hydroxide" patented technology

The object of the present invention is to provide a catalyst for producing methacrylic acid in high yield and highly selectively by subjecting methacrolein, isobutylaldehyde or isobutyric acid to gas phase catalytic oxidation, and the preparation method thereof. The catalyst contains Mo, V, P, Cu, Cs and NH4 as the essential, active components, and the feature is to use for preparing the catalyst a cesium weak acid salt or cesium hydroxide as the Cs raw material and ammonium acetate as the NH4 raw material. A coated catalyst of the present invention is obtainable by supporting the active component on an inert carrier of alumina or the like.

The invention provides preparation methods for a cesium tungsten bronze modified powder and slurry thereof, wherein the preparation methods of the cesium tungsten bronze modified powder include the steps that a cesium hydroxide and nano tungsten oxide solid solution is subjected to decomposition reduction by ammonia water under catalytic action of nano nickel oxide, and a cesium tungsten bronze powder is obtained; and in addition, the obtained cesium tungsten bronze powder has the powder surface modified by a coupling agent and infrared and ultraviolet absorbers to obtain a cesium tungsten bronze modified powder, the modified powder is dispersed in a PVB special-effect plasticizer 3G8 dispersant by a sand mill, and furthermore, the cesium tungsten bronze modified powder slurry is obtained.

The invention relates to a method for preparing N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide (C.I. pigment red 179). A reaction is conducted on N-methyl-1,8-naphthalimide in a system composed of a mixed base composed of caesium hydroxide or hydrate thereof and DBU and polar aryl halide at 140 DEG C-190 DEG C, and N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide can be obtained. After pigment-based processing is conducted on N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide, the crystal form of N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide is the same as that of a C.I. pigment red 179 product.

Methods to recover or separate cesium formate or rubidium formate or both from a mixed alkali metal formate blend are described. One method involves adding cesium sulfate or rubidium sulfate to the mixed alkali metal formate blend in order to preferentially precipitate potassium sulfate from the mixed alkali metal formate blend. Another method involves adding cesium carbonate or cesium bicarbonate or both to preferentially precipitate potassium carbonate / bicarbonate and / or other non-cesium or non-rubidium metals from the mixed alkali metal blend. Further optional steps are also described. Still one other method involves converting cesium sulfate to cesium hydroxide.

The invention relates to the technical field of a preparation method of cesium carbonate and in particular relates to a method for preparing cesium carbonate by an ion exchange method. The method is applicable to preparation of high-purity pollution-free cesium carbonate. The method comprises the following steps of: performing acid leaching, jarosite precipitation, recrystallization and conversion on pollucite to obtain a conversion solution of cesium sulfate; exchanging by using 201*7 strongly alkaline styrene anion exchange resin to obtain a cesium hydroxide solution; and introducing carbon dioxide into the cesium hydroxide solution and neutralizing to prepare a caesium bicarbonate solution; and concentrating, crystallizing, separating and drying to obtain the cesium carbonate finished product. The obtained product is high in purity, simple in process flow, economic and environment-friendly, and suitable for industrialized production; and the process adopting the anion exchange resin is simpler than the process adopting cation exchange resin and elution is avoided, so cesium loss in an eluting process is avoided, the system yield is increased, and the system yield after a mother liquid participates in circulation can reach 92 to 95 percent.

The invention discloses a method for preparing cesium garnet glass-ceramics by low-temperature liquid-phase sintering. Activated kaolin, boric acid, cesium hydroxide monohydrate and sodium hydroxide are used as raw materials. The powder is made by ball milling process, and then it is shaped and sintered under normal pressure. The invention adopts a low-temperature liquid-phase sintering method, can prepare cesium garnet glass ceramics at a relatively low sintering temperature, and can effectively solidify cesium.