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Precipitated Silica: Hot Water Glass Carbonated, Then Acidified to pH 6.75 (Allen 1957)
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27. Oktoba 2026DE
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Precipitated Silica: Hot Water Glass Carbonated, Then Acidified to pH 6.75 (Allen 1957)

Bubble carbon dioxide through hot dilute water glass and the silica comes down as an extremely fine white powder rather than a gel. Edward Allen of Columbia-Southern made it this way as a white reinforcing filler for rubber; this follows his Example XI, which gave a powder of 148 m² per gram. Source: E. M. Allen (Columbia-Southern), US 2,805,955 (1957), Example XI. The percentages are our arithmetic; the filter, mill and indicator are ours. Picture drawn by Youblob.
Kati
2 days

Maagizo

1

Dilute the water glass

Take 12,850 g of sodium silicate solution holding 976 g Na2O and 3115 g SiO2 (7.6 % and 24.2 %, a silica to soda ratio of 3.19 by weight; our arithmetic). Dilute it with water to 48 litres in a stirred kettle with a heating coil and thermometer, and heat to 95 °C.

Vifaa kwa hatua hii:

Glasi ya maji (myeyusho wa silikati ya sodiamu)Glasi ya maji (myeyusho wa silikati ya sodiamu)12850 g
MajiMaji1 as required

Zana zinazohitajika:

Riakta ya shinikizoRiakta ya shinikizo
KikorogoKikorogo
KipimajotoKipimajoto
Mizani ya mizani-mbiliMizani ya mizani-mbili
2

Carbonate for an hour

Bubble in pure carbon dioxide fast enough to add the theoretical amount in about 30 minutes, and keep going at that rate for about 1 hour. The slurry ends at pH 9.85.

Zana zinazohitajika:

Gesi ya kaboni dioksidiGesi ya kaboni dioksidi
Riakta ya shinikizoRiakta ya shinikizo
KikorogoKikorogo
KipimajotoKipimajoto
Karatasi ya kuonyesha pHKaratasi ya kuonyesha pH
3

Filter and wash

Filter the slurry and wash the cake twice with hot water.

Vifaa kwa hatua hii:

MajiMaji1 as required

Zana zinazohitajika:

Kifaneli cha Büchner (kauri)Kifaneli cha Büchner (kauri)
Karatasi ya KuchujaKaratasi ya Kuchuja
4

Acidify to pH 6.75

Stir the cake back into water and bring it to pH 6.75 with 400 ml of 3.5 N hydrochloric acid.

Vifaa kwa hatua hii:

MajiMaji1 as required

Zana zinazohitajika:

Asidi hidroklorikiAsidi hidrokloriki
Chombo cha kiooChombo cha kioo
KikorogoKikorogo
Karatasi ya kuonyesha pHKaratasi ya kuonyesha pH
5

Wash out the chloride

Filter again and wash the cake with hot water until it is nearly free of chloride.

Vifaa kwa hatua hii:

MajiMaji1 as required

Zana zinazohitajika:

Kifaneli cha Büchner (kauri)Kifaneli cha Büchner (kauri)
Karatasi ya KuchujaKaratasi ya Kuchuja
6

Dry at 105 °C and grind

Dry it at 105 °C in a fan oven and grind it to a fine powder. Allen's had a pH of 8.2, 0.61 % sodium and a surface area of 148 m² per gram.

Zana zinazohitajika:

Tanuri la kukaushiaTanuri la kukaushia
Kinu na mchiKinu na mchi
Mitungi ya kioo yenye vifunikoMitungi ya kioo yenye vifuniko

Vifaa

2

Zana Zinazohitajika

13

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Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839

Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839

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