SU44253A1 - The method of obtaining artificial varnish - Google Patents

Description

One of the usual techniques for producing unsaturated hydrocarbons or their esters capable of forming films is to further increase their specificity. An increase in the unsaturation of such compounds is usually achieved by chlorinating them, followed by disengaging hydrogen chloride.

The author of the present invention proposes to produce artificial varnishes from naphthenic esters, hydroxycarboxylic acids or an esterified mixture of acids and alcohols, obtained by extraction of sapropel wax, by chlorinating them with subsequent elimination of hydrogen chloride in vacuum at a temperature of 200-250 °. In the case of the use of naphthenic acid esters, dechlorination is best done in the presence of titanium oxide as a catalyst.

Example 1. Synthetic acids, obtained by oxidation of the salt fraction of oil with acid number WO-105, are esterified with glycerol (or glycol) and chlorinated prior to the addition of 20-OH / o chlorine. Chlorination should be carried out at a temperature not higher than 40-50, using cooling (i.e. after finishing chlorination, the product is loaded into a vessel equipped with a refrigerator and connected

with a vacuum pump and with a vacuum of about 10-25 ML {mercury column, at a temperature of 200-250 hydrogen chloride is removed. Then, the esters are diluted with 1Q% of a solvent (white spirit or solvent naphtha), about 8% of the usual manganese lead desiccant is added and used as an artificial drying oil.

The removal of hydrogen chloride can be carried out in the presence of titanium oxide, an accelerated process. For example, the above-described chlorinated esters of naphthenic acids are heated with 3% TiOj at a temperature of 330 ° without vacuum or at 200 ° under vacuum, and the removal of hydrogen chloride occurs incomparably easier than without a catalyst.

Example 2. An organic extract obtained from sapropel, the so-called sapropel wax, is acidified by acid, the soap is converted into acids, then is esterified by heating the mixture of acids with glycerol at 250-280 for 3 hours. The amount of glycerol required is calculated by the total the amount of hydroxyl alcohol and sapropel wax acids, and varies greatly depending on the origin of the sapropel. The resulting mixture of esters and hydrocarbons is chlorinated in the cold prior to the addition of up to 20% chlorine. After the end of the chlorination process, the resulting mixture is heated to 250, with a vacuum of 15-25 mm Hg. Under laboratory conditions, heating is sufficient to conduct for 1.5 hours. As a result of heating, hydrogen chloride is cleaved, attached as to acids, flowed and, probably, to alcohols and hydrocarbons, and as a result of the removal of hydrogen chloride, the mixture greatly increases its indeterminacy (process control is carried out by iodine number). The mixture, after dechlorination, is dissolved in solvent naphta, or in a mixture of the latter with alcohol (or in other solvents) with the addition of ordinary

sikkativ and serves as artificial drying.

The subject matter of the invention.

1. A method for producing artificial drying oil from naphthenic hydroxycarboxylic acids or a mixture of acids and alcohols obtained by extracting sapropel wax, characterized in that said acids are esterified with polyhydric alcohols, then chlorinated and hydrogen chloride is removed by heating in vacuo at a temperature of 200-250 °.

2. Acceptance of the method according to claim 1, characterized in that the removal of hydrogen chloride from chlorinated naphthenic esters is carried out in the presence of titanium oxide.