摘要:
A method to remove silica from a silica containing material characterized in that it comprises (i) contacting said silica containing material with a first metal ion carbonate, to obtain a first composition, and (ii) heating said first composition in a vessel at a temperature sufficient to increase the pressure above the atmospheric pressure in said vessel or at a pressure of at least 2 bara and at a temperature of at least 80° C., preferably 100° C. wherein said pressure is preferably autogeneously generated, wherein the total amount of water of said first composition originating from (a) the silica containing material and from (b) the first metal ion carbonate is greater or equal to 4 mol of water per mol of metal ion carbonate, and wherein the first composition obtained at step (i) is not a suspension in water and is under solid state at standard temperature and pressure (STP), before the performance of step (ii) and wherein said silica containing material is a zeolite
摘要:
An improved process for producing hydrocarbons which comprises bringing oxygen-containing compounds into contact with a catalyst, said catalyst being a crystalline aluminosilicate, when determined after calcination in the air at 550.degree. C., having a composition represented by the following formula (I):pM.sub.2/n O.Al.sub.2 O.sub.3.qSiO.sub.2 (I)(wherein M represents at least one element selected from hydrogen, alkali metals, and alkaline earth metals, n represents the valence of M, and p and q each represent a molar ratio and are chosen within the ranges of 0.05.ltoreq.p.ltoreq.3.0, 5.ltoreq.q.ltoreq.500) and has a principal X-ray diffraction pattern as set forth in Table 1.
摘要:
Process for the co-production of acetic acid and dimethyl ether by contacting methyl acetate and methanol in the presence of a catalyst containing a crystalline zeolite having a FER framework type. The zeolite has crystallites having a dimension of about 500 nm or less in the c-axis.
摘要:
The present disclosure comprises a new method for hydrothermal synthesis of ferrierite zeolite, using tetramethylammonium and benzylmethylpyrrodlidine as directional structure agents, and does not require a subsequent process in order to obtain the acid form of the material. This aspect is very important as it avoids subject treatments of calcination and successive interchanges which degrade the structure of the zeolite. The synthetic ferrierite obtained by means disclosed processes has uses in catalytic processes of transformation of hydrocarbons, such as cracking, isomerization, alkylation, and polymerization. Specifically, it can be used in the isomerization of butene to isobutene. To be used in catalytic processes, the zeolite ferrierite must be heated in an oxidant atmosphere in conditions such that the organic material occluded in the interior is eliminated.
摘要:
Colloidal crystalline molecular sieve seeds are used in phosphorus-containing crystalline molecular sieve manufacture. Certain of the products have enhanced utility in oxygenate conversions.
摘要:
Crystalline molecular sieve particles of a size suitable for use as seeds in molecular sieve manufacture are obtained by washing larger particle sized product to dislodge smaller particles from the larger.
摘要:
This invention relates to a new and improved form of crystalline silicate identified as zeolite ZSM-35, to a new and useful improvement in synthesizing said crystalline silicate and to use of said crystalline silicate prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
摘要:
An improved process is disclosed for producing alumino-silicates having a porous structure, of the zeolite class, the process essentially comprising the step of preparing a homogeneous aqueous mixture containing a source of alumina, a source of silica and alkali metal bases and/or alkaline earth metal bases, the improvement consisting in adding to said mixture at least one substance which contains at least a hydroxyl group in its molecule. The advantages are that the use of nitrogenous organic substances, universally used heretofore for the preparation of certain zeolites, can be dispensed with inasmuch as the alkali metal ion is capable, alone, of displaying the counter-ion function.
摘要:
Crystalline aluminosilicate molecular sieves are prepared by (1) forming an aqueous mixture of an oxide of aluminum, an oxide of silicon, a metal or ammonium cation and a suitable oxygen-containing monomeric organic template compound, (2) maintaining the pH of such mixture between 9 and 14, and (3) crystallizing the mixture. The organic templates include ethanolamine, diethanolamine, triethanolamine, ethylethanolamine, ethyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, morpholine, and alkali metal complexed tetrahydrofuran, dioxane, dioxolane, and crown ethers. Crystalline aluminosilicates prepared include mordenite, ferrierite, ZSM-4, and ZSM-5.
摘要:
A process is provided for alkylation or transalkylation of aromatic hydrocarbons by contacting same with an alkylating or transalkylating agent in a reaction zone maintained under alkylation/transalkylation effective conditions and in the presence of a catalyst comprising a crystalline aluminosilicate zeolite ZSM-35 and/or ZSM-38, said catalyst under said conditions being capable of affording a high and selective yield of desired alkyl-aromatic product while maintaining excellent aging properties.