DE1667436A1 - Process for the production of fused silica with embedded activated carbon - Google Patents

Description

\ 0e. (Z-beeltfiiaL / Ctdi

Patent attorney application file: 75/66

January 23, 1968

PATEITAIM ELD UIG

Applicant: Ceskoslovenska akademie ved, Praha 1

Process for the production of silica gel with embedded

Activated carbon

The invention relates to a method for producing Silica gel with embedded active carbon.

It is well known that silica gel and active charcoal or their mechanical mixture is used as an adsorbent in various branches of chemistry. A particularly high adsorption capacity was found with silica gel, which contains built-in active charcoal. See, for example, HA Fells and J. B »Hrt, J. Soc. Chem. Ind. 46, T39 (1927), I. SMIoν, M. Dubinin, S. Toropov, Kolloid, Z. 49, 120 (1929), ZZ Vyaockij and IE lejmark, Ukrain. Khim, Shur. 22, 485 (1956), BR Puri, S. Parkash and D, % Singh, J, -. BgU Has, (India); 21B, 158 (1962),

However, such a substance has heretofore been known in practice as Adsorbent not yet used in various branches of chromatography, probably because it did not succeed is to produce a silica gel with embedded active carbon, which has the required homogeneity and is also completely free of inorganic salts.

φ The previously known processes for the production of silica gel with embedded activated charcoal consist in the action of the acids on the mixture of the water glass and the active charcoal or in the effect of zinc chloride on those with water glass soaked birch sawdust. However, these processes do not guarantee that the interfering salts will not be present in the end product.

The object of the invention is therefore to address those that have occurred so far Eliminate deficiencies in the manufacture and in the end product of silica gel with embedded, diffused activated carbon, . ■ ■.

The invention in the method of making silica gel with embedded active charcoal consists in the hydrosol the silica, which was produced in an ion-exchanging manner,

"■■ '" "-" ■■■■ -'. - "- - 3 -

101825 / tSS4

³ 1067436

diffusing the active charcoal and after self-converting the hydrosol into hydrogel to dry this, and in the heat of 105 - 150 ⁰ C to activate.

The conversion of the hydrosol into hydrogel can according to the invention by the addition of known reagents, ζ. B. the ammonium salts, get supported. The silica gel produced by the process according to the invention with the incorporated active Coal is very pure, homogeneous, free of inorganic salts, It is therefore particularly useful in various branches of chemistry, especially in chromatography.

The following example illustrates the manufacturing process according to the invention:

The suspension of activated carbon (100 g) in water (T liter) is added to 60 liters of the silicic acid hydrosol (the silicic acid content of which corresponds to 5 kg of the final product) while stirring intensively at 15-25 ° C, and stirring is continued for another hour continued. The mixture obtained is then converted into hydrogel in a known manner, ie spontaneously or by adding inorganic salts. The hydrogel is then dried at a temperature of 120 ° C. to constant weight. The result: '5 kg silica gel with 2 # activated carbon therein _diffuses: dierter form.

109825 / ISS4 -I-

ORIGINAL INSPECTlD

Claims (2)

Patent attorney application file: 75/66 • January 23, 1968 -I-PATEIT A ISP RÜCHE: 1. A process for the production of silica gel with embedded diffused activated carbon, characterized in that active carbon is suspended in the silica hydrosol, which was obtained in an ion-exchanging manner and, after the hydrosol has itself converted into hydrogel, it is dried and at a heat of 105 - 13O ⁰ C is activated. ^ 2. The method according to claim 1, characterized in that ge: net that the conversion of the hydrosol into hydrogel through the addition of known inorganic salts, e.g. the ammonium salts. PATEITAIWALTY tO 982 5 / 1.5-5