摘要:
Alkaline earth metal basic silicate particles having a silicate of an alkaline earth metal on the surfaces of the alkaline earth metal hydroxide particles, and having an SiO2/MO (M is an alkaline earth metal) molar ratio as a whole in a range of from 0.01 to 0.90. The particles are useful as a stabilizer for the chlorine-containing polymers.
摘要:
According to this invention, an amorphous or pseudo-boehmite-type hydrated alumina gel and an alkali metal carbonate or bicarbonate as starting materials are reacted in an aqueous medium to give a method of producing a process for producing an alkali aluminum complex hydroxide carbonate salt which is industrially low-cost and has high productivity. Furthermore, by using a gibbsite-type hydrated alumina, a lithium aluminum complex hydroxide carbonate salt can be synthesized by a migration method.The lithium aluminum complex hydroxide carbonate salt and the sodium aluminum complex hydroxide carbonate salt obtained by the processes of the present invention have excellent compoundability in pigments and resins.In addition, these complex salts have no foaming hazards at the time of processing the resins and are useful as resin fillers for halogen capturing property, infrared ray absorbing property and excellent transparency. They are especially useful as a stabilizer (halogen capturing agent) for resin films, a warmth-keeping agent (infrared absorbing agent) and an anti-blocking agent.
摘要:
Catalysts for producing methylamines are provided, which comprise mordenite, as the essential component, of spherical fine particles having a crystal diameter of not more than 0.5 &mgr;m. When the catalysts are used for the production of dimethylamine from methanol and ammonia or through a disproportionation of methylamines, they exhibit a high dimethylamine productivity with the formation of few amount of trimethylamine whose demand is very small. The process can be operated for a long period of time without decrease in the catalyst activity.
摘要:
Methylamines are prepared from methanol and ammonia in the presence of modified molecular sieve catalysts obtained by mixing crystalline molecular sieves such as SAPO with modifiers such as titanium oxide. The catalysts are also suitably used for a disproportionation reaction of monomethylamine.
摘要:
Catalysts useful for producing methylamines and having practical catalyst life and large selectivity for dimethylamine comprise crystalline silicoaluminophosphate molecular sieves which have a molar ratio of silicon atom to aluminum atom in the range of 0.01-0.30.
摘要:
Disclosed is a propylene production catalyst for producing propylene from one or more selected from a group consisting of methanol, dimethyl ether and olefins having from 4 to 8 carbon atoms. The catalyst comprises a binderless crystalline aluminosilicate shaped body having a silicon/aluminum atomic ratio of from 500 to 10000, in which the crystalline aluminosilicate contains an MFI-type crystal structure and/or an MEL-type crystal structure. The catalyst reduces the production amount of ethylene, paraffin components such as propane, and aromatic components, and increases the propylene yield and the propylene/propane ratio, and the catalyst life is long.
摘要:
Problems on catalyst production and catalyst performance with respect to conventional 8-oxygen-membered ring micropore-containing crystalline silicoaluminophosphate molecular sieves as non-equilibrium methylamine synthesis catalysts, are resolved. A chabazite type crystalline silicoaluminophosphate molecular sieve having high purity and high crystallinity and having, on a crystal grain surface, an amorphous oxide layer whose Si/Al atomic ratio is greater than that of the whole crystal grain can be stably produced with high yield with the use of a small amount of structure directing agents by the present method characterized in that hydrothermal treatment conducted in the production of 8-oxygen-membered ring micropore-containing crystalline silicoaluminophosphate sieves is controlled under specified treating conditions. The thickness and composition of the amorphous oxide layer, which exert marked influence on the yield of dimethylamine synthesis, can be easily controlled and reproduced under the conditions of catalyst synthesis according to the invention. Thus, the catalyst of high performance can be stably supplied by the present invention at a low cost with reduced output of waste.
摘要:
Catalysts useful for producing methylamines and having practical catalyst life and large selectivity for dimethylamine comprise crystalline silicoaluminophosphate molecular sieves which have a molar ratio of silicon atom to aluminum atom in the range of 0.01-0.30.
摘要:
Catalysts useful for producing methylamines and having practical catalyst life and large selectivity for dimethylamine comprise crystalline silicoaluminophosphate molecular sieves which have a molar ratio of silicon atom to aluminum atom in the range of 0.01-0.30.
摘要:
Disclosed is a propylene production catalyst for producing propylene from one or more selected from a group consisting of methanol, dimethyl ether and olefins having from 4 to 8 carbon atoms. The catalyst comprises a binderless crystalline aluminosilicate shaped body having a silicon/aluminium atomic ratio of from 500 to 10000, in which the crystalline aluminosilicate contains an MFI-type crystal structure and/or an MEL-type crystal structure. The catalyst reduces the production amount of ethylene, paraffin components such as propane, and aromatic components, and increases the propylene yield and the propylene/propane ratio, and the catalyst life is long.