SU1669537A1 - Method for preparing adsorbent in the form of microcapsules and blocks - Google Patents

Abstract

The invention relates to chemical technology, in particular to the preparation of composite adsorbents in the form of microcapsules and silica gel blocks on a polymer matrix, which are used in industry for drying gases. The aim of the invention is to increase the sorption capacity for water vapor, the kinetics of the moisture absorption process and the depth of drying. Silica gel saturated with acetone or ethanol, or hexane, or benzene is used as the initial adsorbent, which is treated with an aqueous solution of polyacrylamide with a concentration of 0.5–2.5 wt.%, Which is mixed with silica gel for 1–10 minutes, after which the mixture are separated from the solution and dried at 130-180 ° C. Technical and economic advantages of this method consist in increasing, in comparison with the prototype, water sorption capacity by 30-40%, protective time and drying depth, as well as improving the adsorption kinetics. 2 tab.

Description

The invention relates to chemical technology, in particular to methods for producing adsorbents in the form of microcapsules and blocks, which can be used to remove water vapor from gaseous media.

The purpose of the invention is to increase the adsorption capacity for water vapor.

Example 1. Silica gel granules are saturated with acetone, combined with a 1.5% solution of PAA (to obtain capsules, immersing the granules on the grid in the polymer solution, to obtain blocks, spilling the polymer solution through an adsorber with adsorbent granules with fixing the level of the solution above the charge level ) for 5 min, after which the adsorbent is separated from the solution and dried at 150 ° C according to standard procedures.

Examples 2-7. The process is carried out analogously to example 1, varying the concentration of the PAA solution, the time of mixing the adsorbent with the polymer solution, and the drying temperature.

The process conditions are presented in Table 1.

Example 8. The process is carried out analogously to example 1 except that the silica gel is pre-saturated with ethanol.

Example 9. The process is carried out analogously to example 1 except that the silica gel is pre-saturated with hexane.

ON СЬ О

with

00

four

Example 10 The process is carried out analogously to example 1 except that the silica gel is pre-saturated with benzene.

The resulting sorbent materials were tested for sorption capacity Ws by water vapor (capsules and blocks), by moisture absorption kinetics (capsules), by drying depth (capsules and blocks), and for a time of protective action by water vapor (capsules and blocks). Ws were determined by the exsiccator method at, 13 and 0.85. The kinetics of moisture absorption was judged by the half-production time of Go.5, the equilibrium sorption capacity under dynamic conditions. The process was carried out in the intradiffusion region, air 600TN.%

The depth of drying was determined under dynamic conditions, fixing the air humidity (dew point) behind a layer of capsules or a fixed charge (block), 30 cm high. The initial air humidity was 55 rel.%, Air velocity 0.5 l / min.

The protective time was determined under similar conditions, fixing the breakthrough time at a concentration of 0.1 Co

The data obtained are given in table. 2

Thus, the inventive method makes it possible to obtain a sorbent material with improved sorption characteristics for water vapor. Thus, the sorption capacity is 30–40% higher than that of the prototype, the half-time decreased 1.1–4.8 times, the drying depth at the dew point was 1–9 ° C, and the protective time increased by 11–61%.

Claims (1)

Invention Formula The method of obtaining the adsorbent in the form of microcapsules and blocks, comprising mixing the adsorbent pre-saturated with the solvent with polyacrylamide, and subsequent drying, characterized in that, in order to increase the adsorption capacity of water vapor, silica gel previously pre-saturated with a solvent selected from the group acetone, standard, hexane, benzene, the adsorbent is mixed with an aqueous solution of polyacrylamide with a concentration of 0.5-2.5% for 1-10 minutes, the polymer solution is separated and the drying is carried out at 130-180 ° C Table 1 Spreadsheets