Linseed oil bleaching. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Linseed oil bleaching. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Here are the recipes linseed oil bleaching.

Bleaching with sulfuric acid

A certain amount of linseed oil is loaded into a vat lined with lead and equipped with a stirrer. 3-5% concentrated sulfuric acid (sp. w. 1,84) is added and stirred for 8-10 hours. After this time, the oil is poured into glass vessels and exposed to light for a period of 3 to 6 weeks.

Sulfuric acid has a destructive effect on colored organic impurities, which are deposited in the form of a dark precipitate on the bottom. Next, the oil is drained from the sediment and washed with warm water. The water-free oil is slightly heated to remove traces of water and then filtered.

Bleaching with potassium permanganate salt

For every 10 kg of oil, 1 liter of a 3% potassium permanganate salt solution is added to a lead-lined stirrer, then the oil is stirred for 1 hour and allowed to stand for another 2 days, stirring occasionally. After this period, 6 percent hydrochloric acid (sp. w. 1,16) is added to the oil with constant stirring, the stirrer is rotated for 1 hour and the oil is allowed to settle for 24 hours. Next, the oil is drained, thoroughly washed with warm water and filtered (you can use a press filter). This method gives a completely colorless oil.

Bleaching according to the method of Metna and Clarkozone

To 200 kg of raw linseed oil, add a solution of 20 kg of sodium sulfide salt in 400 liters of water, mixing thoroughly, after which the oil is allowed to stand for 32 hours, stirring from time to time. After settling, a colorless oil is obtained, and it does not change its properties. After bleaching, the oil is separated from the aqueous liquid, which contains some oil, usually recovered by naphtha.

Bleaching with two-chromium potassium salt

Bleaching is carried out, as in the first two cases, in a mixer. To 100 kg of raw linseed oil, add a solution of 3 kg of dichromate potassium salt in 10 liters of hot water with stirring. Stirring continues for 1,2 to 1 hour, then the solution is left alone for 48 hours. Next, add 4 kg of hydrochloric acid (20 °Be; specific gravity 1,16), mix well and leave for 24 hours. Then the oil is washed, allowed to settle and filtered through bone charcoal (on filter presses).

Author: Korolev V.A.

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