SU818647A1 - Method of producing catalyst for polymerisation of olefines - Google Patents

Description

A distinctive feature of the invention is to conduct the interaction of components and drying by dispersing the mixture into a heat carrier stream.

The method according to the invention is significantly technologically simpler in comparison with the known, and the process of obtaining a catalyst according to the method according to the invention is much more intensive. Thus, the proposed method provides for the creation of a process continuity, the reduction of catalyst preparation stages, such as mass gouging, aging, mass drying, grinding, sieving, aging, moistening.

According to the proposed method, pyrophosphoric acid is mixed with a carrier and the resulting mixture is well mixed in a heated mixer at 50-160 ° C for 10-12 minutes. Then, a catalyst powder is obtained from this mass by spraying. Immediately after mixing, the catalyst powder is obtained by spraying the liquid catalyst mass and carrying out a chemical reaction between the components to form a solid powdered material in the reaction chamber by feeding countercurrently to the sprayed mass of hot coolant.

Example 1. Phosphoric acid with a concentration of 80% (P205) with a temperature of 50 ° C with constant stirring is mixed with a powdered carrier, which is used as kieselgur or a synthetic adsorbent: microspheric aluminosilicate catalyst (MACK) or silica gel (white carbon), heated mixer. The weight ratio of acid and carrier is 2.4: 1. The mixture of components is stirred for 12 minutes until homogenization.

The mixture is then sprayed on a spray-drying unit, and a chemical reaction is carried out by supplying hot air with a temperature of 280 ° C to the reaction chamber with a countercurrent. The resulting catalyst mass with a moisture content of 16%

extruded. The granular catalyst is dried to a moisture content of 6.3%.

Example 2. Phosphoric acid with a concentration of 80% (by PsOs) and with a temperature of 100 ° C with constant mixing. The s. Is mixed with a powdered carrier (diatomaceous earth, or MACK, or silica gel) in a heated mixer. The weight ratio of acid and carrier is taken 2.4: 1. The mixture of components is mixed in

within 12 minutes before gonogennzatsii. The mixture is then sprayed on a spray-drying unit, and a chemical reaction is carried out by supplying hot air with a temperature of 280 ° C to the reaction chamber with a countercurrent. The resulting catalyst mass with a moisture content of 16% is extruded. The granular catalyst is dried to a moisture content of 6.3%. Example 3. Phosphoric acid with a concentration of 80% (P2O5) and with a temperature of 160 ° C is mixed with a powdery component (kieselguhr, MASK or silica gel) in a heated mixer with constant mixing. The weight ratio of acid and carrier is 2.4: 1. C. The mixture of components is stirred for 12 minutes until homogenized. The mixture is then sprayed on a spray-drying unit, and a chemical reaction is carried out by supplying hot air with a temperature of 280 ° C to the reaction chamber with a countercurrent. The resulting catalyst mass with a power of 16% is extruded. The granular catalyst is dried to

humidity of 6.3%.

The quality indicators of the obtained catalyst samples are presented in table. 1. In addition to air as coolants, the same conditions were used in Table 1

tans are two more agents; flue gas composition, 06.%: COA 10-11; SOa 0.15-0.20; HgO 11 - 12; N2 67-69; Og 11-12 and nitrogen 99.2% purity.

In tab. 2 shows the quality indicators of the obtained samples of the catalyst with preliminary mixing at 100 ° C.

table 2

Claims (2)

1. Scientific basis for the selection and production of catalysts. Ed. SB RAS, 1964, p. 295-299. 2. USSR author's certificate No. 580677, cl. At 01J 37/00, 1976 (prototype).