摘要:
Templating compounds of the formula:(HO--C.sub.2 H.sub.4).sub.3 N.sup..sym. --(CH.sub.2).sub.n -N.sup..sym. (C.sub.2 H.sub.4 --OH).sub.3 2 Br.sup..crclbar.wherein n equals 3, 4 or 5 are produced by reacting triethanolamine with .alpha., .omega.dibromoalkanes, for example in the presence of a solvent. One can also react dibromoalkane with the triethanolamine in dropwise manner at reaction temperature. The product is subsequently recovered by known methods. The templating compositions can be used for the preparation of the zeolites of the pentasil types. These zeolites have the composition represented by the summary formula:(0.4-0.7)Na.sub.2 O/(0.3-0.6)Q.sub.2 O/Al.sub.2 O.sub.3 /(30-80)SiO.sub.2 /(4-10)H.sub.2 Oand have the following X-ray diffraction pattern:______________________________________ d .ANG. I/Io ______________________________________ 11.0 .+-. 0.2 30-70 10.0 .+-. 0.2 30-80 4.4 .+-. 0.1 10-20 4.3 .+-. 0.1 10-20 3.85 .+-. 0.05 100 3.74 .+-. 0.05 40-65 3.66 .+-. 0.05 20-40 3.43 .+-. 0.03 15-25 2.01 .+-. 0.02 5-15 1.99 .+-. 0.02 5-15 ______________________________________ They are prepared by utilizing an aqueous suspension of precipitated silica and mixing with an aqueous sodium aluminate composition and an aqueous solution of the template compound. This mixture is then converted under autogeneous pressure, the product is dried and then calcined. The pentasil type zeolites can be used in the conversion of methanol into hydrocarbons.
摘要:
The method for the preparation of hydrogen sulfide from its respective elements wherein sulfur and hydrogen are reacted in a diffusion flame in a temperature range of 650.degree. to 1300.degree. C.
摘要:
According to the invention there are produced sodium Zeolite A granulates having the following parameters:______________________________________ Adsorption Data: (p/po = 0.8, 20.degree. C.) ______________________________________ H.sub.2 O > 22.0% NH.sub.3 > 11.0% CO.sub.2 .ltoreq. 0.1% O.sub.2 .ltoreq. 0.1% N.sub.2 .ltoreq. 0.1% Ar .ltoreq. 0.1% CH.sub.3 OH .ltoreq. 0.2% CH.sub.3 --CH.sub.2 --OH .ltoreq. 0.2% ______________________________________ The zeolite granulate is produced by having zeolite A powder present in a mixer, adding alkali silicate solution, mixing until there are obtained zeolite granulates having a particle size of at least 0.1 mm, in a given case post-rolling the granulates, first drying the moist zeolite granulates with air in a fluidized bed drier at a temperature of 20.degree. to 39.degree. C., during which the carbon dioxide content of the drying air is adjusted to less than 200 ppm, subsequently drying in a second drying step at a temperature of 40.degree.-120.degree. C. and in a given case drying in a third drying step at 121.degree.-200.degree. C. under otherwise the same conditions and subsequently activating the thus obtained granulates at a temperature of at most 600.degree. C. in a rotary tube. The zeolite granulate is used in the production of insulating glass windows.
摘要:
The previously carried out internal coating of contact tubes not only required very much manual labor and was very time consuming, but it was also unsatisfactory in regard to adhesion of the contact liquid to the surface and homogenity of the catalyst. By the simultaneous action of heat on the liquid interface in the tubes during the lowering of the liquid level as well as by a specially suited apparatus for this purpose which operates according to the principle of communicating tubes there is provided the possibility of a good adhesion to the surface as well as the formation of a homogeneous layer at very little operating expense.
摘要:
The subject of the invention is a process for the manufacture of (iodoorganyl)alkoxysilanes of the general formula: ##STR1## in which R.sup.1 is an alkylene group, R.sup.2 is an alkoxy group and R.sup.3 and R.sup.4 an alkoxy group and/or an alkyl or aryl group, whereby the chlorine or bromine compound corresponding to that of formula (1) is caused to react with stoichiometric to double molar quantities of an inorganic iodine donor in the presence of 0.01-5 mol % of an organic substituted onium salt of nitrogen, phosphorus, arsenic or antimony or an organic substituted sulfonium salt or a crown ether as catalyst, in certain solubilizing agents.
摘要:
By introducing the reaction gas mixture of hydrocarbons and ammonia at increased velocity through an inlet tube with one or more openings in a customary reaction tube in the hydrocyanic acid-methane-ammonia (BMA) process the yield of HCN is increased considerably.
摘要:
For the reduction of the ammonia content in the product gas of the hydrocyanic acid-methane-ammonia (BMA) process and accordingly to increase the yield the reaction gas mixture of this process is brought into contact with zeolite and the ammonia thereafter desorbed from the zeolite preferably again employed in the reaction step. If the desorption is carried out with a flushing gas such as the hydrocarbon used in the reaction then this mixture can be directly supplied again to the BMA reactor. Through this procedure the amount of ammonia previously lost to the process can again be made useful in the process itself.
摘要:
There is provided temperature stabilized pyrogenically produced aluminum oxide-mixed oxide having a BET surface area of 50 to 200 m.sup.2 /g which contains 0.5 to 20 weight % silicon dioxide as a constituent thereof. Because of the silicon dioxide constituent the aluminum oxide does not change into the .alpha.-Al.sub.2 O.sub.3 phase until 1350.degree. C. The temperature stabilized aluminum oxide-mixed oxide is suitable for the production of thermal insulation compositions.
摘要:
Thermally split zirconium silicate is produced such that the crystalline zirconium dioxide embedded in an amorphous silica phase exhibits an average grain or particle size (d.sub.50 value) in a range of 0.5 .mu.m to 3.0 .mu.m and a specific surface (BET) in a range of 3 to 15 m.sup.2 /g. The zirconium dioxide produced by this method is particularly suited for the production of zirconium silicate pigments with improved color characteristics. The thermally split zirconium silicate is also particularly well suited for processes used in the obtention of zirconium dioxide. The method of producing the thermally split zirconium silicate includes melting zirconium silicate in an induction melting furnace and cooling off a free falling stream of melt by blowing on it with a gas and/or spraying it with water.
摘要:
Molecular sieves are modified by an ion exchange process where metal cations are introduced into the molecular sieves by means of solid state ion exchange. The solid state ion exchange can be carried out as follows: a weighed amount of calcined and activated zeolite is intimately mixed with a precalculated amount of PtCl.sub.2, PdCl.sub.2, RhCl.sub.3, CuCl.sub.2, V.sub.2 O.sub.5 or another compound of the noble metals (e.g., corresponding halides or oxides), the solids mixture is then heated in a current of inert gas (e.g., a current of helium gas or of nitrogen) to temperatures of 400.degree. to 600.degree. C., then cooled down to room temperature and subsequently reduced in a current of hydrogen for 10 to 14 hours at 280.degree. to 350.degree. C. in order to produce small metal clusters from the cationically introduced metal.