SU818643A1 - Catalyst for thermocatalytic destruction of phenol resin - Google Patents

Description

le in the ratio of 1: 2. A filled silica-alumina sol with a pH of 8.0 formed in the mixer enters the column with transformer oil, where in 5-6 seconds the droplets of ashes gel into the hydrogel in the form of pellets. Molded balls are subjected to syneresis in a solution of sodium sulfate (30 g / l) at 50 ° C for 8 hours and ion exchanged with a solution of ammonium sulfate (0.25 N) at 50 ° C for 20 hours, washed with distilled H2O at 50 ° C until complete removal of the SOl ion. It is dried at 130–180 ° C for 6–8 h and calcined in a stream of 100% water vapor at 750 ° C for 6 h. A catalyst of composition, wt.%, Is obtained: 18 sillimanite and 82 amorphous aluminosilicate.

Example 2. Similar to example 1, but the amount of sillimanite introduced into the liquid glass solution is 56 g / l. Get the catalyst composition, wt.%: 32 sillimanite, 68 amorphous aluminosilicate (ASC).

Example 3. Analogous to example 1, but the amount of sillimanite injected into the solution of soda glass was 90 g / l. Get the catalyst composition, wt.%: 43 sillimanite and 57 amorphous aluminosilicate.

The catalysts are tested in the process of thermal catalytic decomposition of a phenolic resin. The process is carried out in a flow reactor with a fixed bed of a ball catalyst at atmospheric pressure, a temperature of 300 ° C, a bulk feed rate of 0.7 and a melt recovery period of 5 hours. The catalyst is regenerated by coke from its surface with oxygen at 600 ° C.

The composition of the liquid reaction products is determined by chromatography, the amount of coke is determined by the ascarite method, by absorption of carbon dioxide by the ascarite. The regenerative capacity of the catalyst is estimated from the reduced intensity of coke burning in grams per 1 hour from 1 liter of coked catalyst at a burning temperature of coke of 600 ° C. The selectivity of catalysts is defined as the ratio of the sum of the desired products — phenol, a-methylstyrene and isopropylbenzene — to coke. The comparative results of the thermocatalytic degradation of the phenolic resin into sillimanite and sillimanitseolite-silicate catalysts are given in table. one.

Table 1

The data table. 1 indicate that the catalyst, having in its composition 18 to 43 wt.% Sillimanite, in its selectivity in the process of thermal catalytic decomposition of a phenolic resin, exceeds sillimanitseolite containing 1.5-2.5 times, in regenerative capacity 1.4-1.7 times.

In tab. Figure 2 describes the porosity of sillimanite zeolite and sillimanite catalysts.

In tab. 3 shows examples of repeated use of sillimanite and sillimanite zeolite-containing catalyst, showing the advantages of the proposed catalyst in comparison with the known. The activity of sillimanite zeolite-containing catalyst decreases after repeated regenerations, and sillimanite-containing catalyst remains stable. The destruction was carried out at 400 ° С, the volumetric feed rate of the raw material was 1.0 CMVcM-h, and the test duration was 2 h

table 2

Table 3

Claims (2)

Claim A catalyst for thermocatalytic destruction of a phenolic resin, comprising sillimanite and amorphous aluminosilicate, characterized in that, in order to reduce coke formation of the catalyst and improve its regenerative ability. it contains components in the following ratio, wt.%: sillimanite 18-43, amorphous aluminosilicate - the rest. 15 Sources of information taken into account in the examination 1. The patent of Germany No. 1121621, class. 12g 14/02, published. 1962. 2. USSR copyright certificate 20 No. 583996, cl. C 07/12/02, 1978 (prototype).