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Precipitated Silica: Hot Water Glass Carbonated, Then Acidified to pH 6.75 (Allen 1957)
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27. Ukwakira 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.
Hagati
2 days

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)12850 g
AmaziAmazi1 as required

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
Igikoresho cyo kuvangaIgikoresho cyo kuvanga
Igipima UbushyuheIgipima Ubushyuhe
Umunzani w'ibiroUmunzani w'ibiro
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.

Ibikoresho bikenewe:

Gaze ya dioxyde de carboneGaze ya dioxyde de carbone
Reyakitori y'igitutuReyakitori y'igitutu
Igikoresho cyo kuvangaIgikoresho cyo kuvanga
Igipima UbushyuheIgipima Ubushyuhe
Urupapuro rwerekana pHUrupapuro rwerekana pH
3

Filter and wash

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

Ibikoresho by'iyi ntambwe:

AmaziAmazi1 as required

Ibikoresho bikenewe:

Ifonelo ya Büchner (ya porcelaine)Ifonelo ya Büchner (ya porcelaine)
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
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.

Ibikoresho by'iyi ntambwe:

AmaziAmazi1 as required

Ibikoresho bikenewe:

Asidi ya kloridiriAsidi ya kloridiri
Ikibindi cy'ikirahureIkibindi cy'ikirahure
Igikoresho cyo kuvangaIgikoresho cyo kuvanga
Urupapuro rwerekana pHUrupapuro rwerekana pH
5

Wash out the chloride

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

Ibikoresho by'iyi ntambwe:

AmaziAmazi1 as required

Ibikoresho bikenewe:

Ifonelo ya Büchner (ya porcelaine)Ifonelo ya Büchner (ya porcelaine)
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
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.

Ibikoresho bikenewe:

Ifuru yo kumishahoIfuru yo kumishaho
Isekuru n'UmuhiniIsekuru n'Umuhini
Icupa ry'Ikirahure Rifite UmufunikoIcupa ry'Ikirahure Rifite Umufuniko

Ibikoresho

2

Ibikoresho bikenewe

13

Iki gishushanyo gikora

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