SU382657A1 - - Google Patents

Claims (2)

one Izabreteiii refers to the separation of valuable chemical products from wood waste, in particular to the method of separation of high molecular weight hydroxyl and carboxylsoder: Resin products: suberin and betulin from the timber of a tree, such as birch. A known method for isolating betulin by prolonged extraction of coarsely ground bark with ethyl alcohol followed by isolation of suberin by boiling the residue with hot alcohol alkali. However, this method is technological, durable and ineffective. Due to the small volume weight of the birch bark, the load factor of the apparatus is low, the extraction and cooking process is long, the recovery of ethyl alcohol is slowing flax: calibrating it causes complications, the products are contaminated. The aim of the invention is to improve the process and improve the quality of the target product. The proposed method consists in the fact that the crust is bleached in the presence of alkali, hot isotropyl alcohol is added with stirring at 60-70 ° C, the solution is separated, from which the solvent is distilled off, and water is added to the resulting extract. At the same time, the betulin precipitated out is separated, and subderms are isolated from the aqueous solution by acidification. In addition, 85-88% isolate alcohol can be used. The proposed method allows to significantly simplify the technology, replace ethyl alcohol with more affordable and acceptable isopropyl alcohol and obtain the target products in a more pure form. The proposed method is as follows. Berezov Kara, exempted from The bast is ground (with an aqueous solution of alkali NaOH) in any known grinding device. Under the stirring, hot (t 60–70 ° C) 85–88% isopropyl op-irt is added to the mass. The solution is separated by filtration or fugovaniem. The residue, which is mainly lignin and other colloidal, is treated with live steam to remove isodropyl alcohol. From filtrate (fugata) isopropyl alcohol is also distilled. Water is added to the extract. After diluting the extract with water, betulin is dispersed in the aqueous solution. In the hot state, it normally cleans from the solution. After drying, betulin is a white or slightly yellowish powder. The aqueous solution is acidified. In this case, a slightly yellow flocculent sediment-suberin with the smell of vanilla falls out. Suberin very easily separated by filtration or by washing and washing with water. Dried suberin is a dark brown brown, viscous mass at room temperature. The filtrate from suberia parti is colorless and contains almost no organic compounds. According to the analysis of the analysis of water, conditionally pure water. Example. To 100 kg of bark (bark) with a moisture content of 1-2%, 62.3 kg (50 l) of 22.5 / o-caustic soda are added. After crushing with alkali to the mass, 450 liters of hot () 88% of new isopropyl alcohol are poured in with stirring. Drug, p is separated, and isoprolyl alcohol is distilled from it. The extract from the distillation of alcohol from the solution is diluted with 200 liters of water. From the aqueous plant, released by the fugging from betul), is isolated suberic acid by acidification with sulfuric acid to pH 4.5-5.0. Out of 100 kg of dry stock, no water products are obtained: 30 kg of suberin, 26 kg of betulin, 44 kg of lignite residue. Comparative data on the yield of target products obtained from birch bark.  Suberin according to the known and proposed methods of light brown Paste 1 and the mass with the smell of vanillin. Betulin by the known and proposed methods; odorless yellowish powder. Acid number (mg KOH / 1 g) of suberin and betulin, respectively, and 18–20 by the known method and, respectively, 136–140 and O / by the bid. The saponification number (mg KOH / 1 g of suberin and betulin, respectively, 180-190 and 30-35, according to a known method, and respectively, 200-2i4 and O, as proposed. The zero acid and ester numbers of betulin, obtained by the proposed method, indicate the absence of acids and esters in it. Consequently, in a new way, the separation of the bark components occurs more clearly, and the target products are obtained cleaner. The proposed method is simple and technologically advanced, and all operations are easy to implement. The materials used in production are non-deficient and inexpensive. The resulting main commercial products, suberin and betulin, are valuable raw materials for industrial organic synthesis. Pre 1M e of the invention A method for isolating betulin and suberin from the bark of wood, such as birch bark, using extraction with alcohol and alkali, characterized in that, in order to improve the quality of the target product and improve the process, the bark is crushed in the presence of alkali and hot isopropyl alcohol is added with stirring at 60-70 ° C, the solution is separated, from which the solvent is distilled off, to the resulting extract is added water that precipitates; betulin, which is precipitated during etodch, is separated out of betulin, and suber is extracted from the aqueous solution by adding | 2. The method according to claim 1, characterized in that 85-88 / o-ny isolropic is used alcohol.