SU880978A1 - Method of producing mordenite - Google Patents

Description

one

The invention relates to the production of mordenite and can be used in the manufacture of catalysts and sorpants.

A known method of producing mordenite is by autoclaving for 24 hours peizy with a solution of sodium silicate, followed by filtering the resulting pulp, washing and drying the precipitate l j.

There is also known a method for producing mordenite by autoclaving a mixture of sodium silicate, aluminosilicate gel and cracking the catalyst with a solution of sodium hydroxide in the presence of sodium chloride and mordenite seed. The resulting pulp is filtered, the precipitate is washed and dried for several hours at 50 C. The size of the resulting crushing, tal 20–120 μm .2J.

The disadvantage of this method is its complexity, due to the preparation of the original aluminosilicate gel and the need to use

use of a significant number of reagents.

The purpose of the invention is to simplify the process.

The goal is achieved by the use of perlite as an alumina-desiccated material, and if it is treated with a solution of sodium hydroxide, in the presence of silicon dioxide and phosphoric acid, taken

10 in the amount of 2-16% and O, 2-3; 8%, respectively, based on the weight of perlite.

The sodium hydroxide solution is used at a concentration of 1575 g / l. .

ts

The treatment is carried out at 100-260 ° C for 1.5-48 hours and initial ratios L: T 1.34-3.5 in closed metal reactors with stirring. As silicon dioxide can be

Claims (2)

20 used diatomite, silicic acid, silica gel, sodium silicate. The perlite of the Aragats deposit in the Armenian SSR was used. the following chemical composition,%:, 44; TiOa 0.05; 13.14; R..bZ; CaO 0.78; MgO 0.39; MnO 0.03; 4.21; 3.48; 3.60; with a molar ratio of A1. ,, 5. Example 1 A mixture consisting of 350 g of nepjraTa, ground to a particle size of 0.1 mm or less, and 12 g of seed of mordenite with a part size of 10-15 µm are treated with a 65 g / l aqueous solution of sodium hydroxide, 0.5 l (ratio, 50) in the presence of 36 g of silicon dioxide and 6 ml (10.12 g) of 85% phosphoric acid. The alkaline treatment of perlite is carried out at 175 ° C for 8 hours. Then, the resulting precipitate is separated by filtration , from the solution, washed with 2 liters of distilled water at 40-50 ° C and dried at this temperature, a zeolite is obtained, which corresponds to the oxide formula 0.58 Nd-jO- 0.2K, 0-Ae, Oj 9.76iO, .2-H The obtained mordenite is represented by rounded and elongated particles of size 20-60 IJIKM. When the concentration of the alkaline solution is increased to 75 g / l NaOH with simultaneous increasing the amount of silicon dioxide to 42 g and phosphoric acid to 8 ml (13.52 g) and maintaining the rest of the experiment, the same and a slight increase in the reaction rate, and to complete the conversion of perlite to mordenite, the necessary duration: the process decreases to 8 hours. Further improvement of the concentration of caustic soda in the original solution e, as well as the amounts of bio: silicon silicon and phosphoric acid, it is advisable, since it does not lead to a significant increase in the reaction rate and particle size of the product. Example 2. A mixture consisting of 350 g of perlite, ground to a particle size of 0.1 mm and less, and 12 g of seed of mordenite with a particle size of 10-15 µm are treated with an aqueous solution of sodium hydroxide with a concentration of 20 g / l, 0.5 volume l (ratio, 42) in the presence of 12 g of silica and 2 ml (.3.37 of 85% phosphoric acid). Alkaline treatment of perlite is carried out at 175–12.5 hours. Then, the precipitate is separated by filtration. solution, washing with 1.8 l of distilled water at 40-50 ° C and dried at this temperature. A mordenite is obtained, which corresponds to the oxide formula O, 58 - NoijO 0.34 K 20-A fO, 6SiO2. -6.2 H2O The resulting mordenite is represented by rounded and elongated particles 15–45 µm in size. On the derivatogram of the obtained mordenite, an extended endothermic effect is observed in the range of 25–48 ° C, due to the release zeolitic water without destroying the structure, mordenite. Decreasing the ratio of LC; T in the initial mixture to 1.34 and maintaining the remaining conditions of the experiment constantly increases the size of the particles of the resulting mordenite to 25-70. µm, however, a further reduction of this ratio is impractical because it makes it very difficult to move thick pulp in the reactor. PRI me R 3. A mixture consisting of 190 g of perlite, crushed to a particle size of 0.1 mm or less, and 12 g of seed of mordenite with a particle size of 10-15 µm, are treated with an aqueous solution of sodium hydroxide with a concentration of 40 g 0.5 liter (ratio, 68 v. presence of 27 g of silica and 4 ml (6, 85% phosphoric acid. Alkaline treatment of perlite is carried out at 175 C for 9 h. Then the resulting precipitate is separated by filtration from the solution is washed with 1.6 l of distilled water at 40-50 ° C and dried at this temperature. A mordenite is obtained, which corresponds to oxide pho Mula 0.6, 31 KjO-Al pa 10.5 SiO x X 6.5 N, The resulting mordenite is represented by rounded and elongated particles of 20–40 µm in size. EXAMPLE 4 A mixture consisting of 350 g of perlite crushed to a particle size of 3 mm or less. And 25 g of seed of mordenite with a particle size of 40-80 µm are treated with an aqueous solution of sodium hydroxide with a concentration of 40 g / l NaOH, 0.5 liter (ratio, 39) in the presence of 20 g of silicon dioxide and 4 ml (b, 74 rj of 85% phosphoric acid. Alkaline treatment of perlite is carried out at 220 ° C for 14 hours. Then the resulting precipitate is separated from the solution by filtration, washed with 2 liters of distilled water at. 40–50 ° C and dried at this temperature. A mordenite is obtained, which corresponds to an oxide formula of 0.6 Nagp-0.38 l4.0-Al2.0- “10.8. SlU X 6.8 Ndr The obtained mordenite is represented by round particles of 40130 µm. The proposed method for producing mordenite is simpler, less time consuming than the known ones, and makes it possible to obtain a product with particle sizes from 20 to 130-140 µm from cheap natural raw materials containing all the constituent elements of mordenite. In addition, the resulting mord nit is much cheaper, and its use in the national economy gives a great economic effect. Claim 1. Method for producing mordenite by autoclaving the aluminosilicate material with a sodium hydroxide solution in the presence of a mordenite seed, followed by filtering the resulting slurry, extracting and drying the precipitate of the target product, characterized in that, in order to simplify the process, as a raw material perlite is used, and perlite is treated with sodium hydroxide solution in the presence of silicon dioxide and phosphoric acid, taken in amounts of 2-16% and 0.2-3.8%, respectively, based on the weight of perlite . 2. Sporb pop.1, which also uses sodium hydroxide solution with a concentration of 15-75 g / l. Sources of information taken into account in the examination 1. US patent 3436174, cl. From 01 to 33/26, W69. 2. US patent 4081514, cl. From 01 To 33/26, 1978 (prototype) -.