SU1213019A1 - Method of separating aliphatic c8-c18 alcohols and c8-c20 hydrocarbons - Google Patents

Description

The invention relates to chemistry and chemical technology and can be used for the separation of mixtures of Cg-C g-Alcohols - hydrocarbons, for the purification of hydrocarbons from the mixtures of alcohols.

The aim of the invention is to increase the degree of purification and reduce the processing time.

Example I, Separation of a mixture of octanol C1) and undecane (I).

10 g of a mixture containing 50 ppm each.% I and P is dissolved in 50 ml of petroleum ether. To the resulting solution, add 25 ml of a 0.3-molar solution of aluminum bromide in Nitrile acetate (phase ratio 2: 1) and shake the mixture obtained 1 shn at a temperature of 20 ° C. Then the phases are separated, and the phase of ether is washed with 50 ml of water to remove possible acetonitrile impurities, followed by petroleum ether

distilled off at a pressure of 200 mm Hg. The residue from distillation contains - with 4.99 g of product containing 99.9% by weight of undecane. The acetonitrile phase — raffinate — is diluted three times with water. Adetonitrile is then distilled off at 200 mm Hg. Extraction of alcohol is extracted twice with half the volume of petroleum ether with respect to the raffinate volume. The petroleum ether phase containing the alcohol is separated, then the petroleum ether is distilled off. 4.9 j8 g of product are obtained, containing 99.8% by weight of octanol.

I

The degree of separation of octanol is 99.4%, uncane is 99.7%.

PRI mme R 2. Separation of a mixture of octadeconol {Pi eicosane (P).

In 50 ml of petroleum ether are dissolved with slight heating (up to 40 ° C. 4 g of a mixture containing 50 wt.% I and P. 50 ml of a 0.5-molar solution of aluminum bromide in acetonitrile are added to the resulting solution ( phase ratio 1: U heated to 40 ° C and shake the resulting mixture for 1 minute. The petroleum ether phase is separated, washed with 50 ml of water, after which petroleum ether is distilled off. The residue from the distillation has a weight of 1.99 g and contains 99 wt .% eicosane. Product extracted from the acetonitrile phase 13019

thief, has a weight of 1.98 g and contains 99.9% wt.% octadecanol.

The degree of octadecanol separation was 98.9%, eicosane 99.2%. 5 Example 3. Purification of octane from alcohol impurities.

Reactive octane grade h contains about 0.5% of impurities of C-j-Cg-alcohols. Bromide treatment solution

Aluminum 10 in acetonitrile makes it possible to completely purify octane from these impurities.

100 MP of contaminated octane are washed with 10 ml of a 0.5 molar solution.

15 aluminum bromide in acetonitrile (10: 1 phase ratio). The phases are separated, and the octane phase is washed with 100 mi of water to remove acetonitrile impurities. The octane purified in this way does not contain any alcohol impurities.

Note 4. Separation of a mixture of tetradecanol and .hekoadekan.

B 50 ml of petroleum ether was diluted with a slight heating (up to) 6 g of a mixture containing 4 g of tetradecanol and 2 g of hexadecane. To the resulting solution is added 100 ml of a 0.3 molar solution.

30 aluminum bromide in adetonitrile (phase ratio 1: 2) and shake the resulting mixture for 1 minute. The phases are then separated and the phase of petroleum ether is washed with 50 mp of water for

35 remove possible impurities of acetonitrile, after which petroleum ether is distilled off at a pressure of 200 mm Hg. The distillation residue contains 1.99 g of a product containing

40 99.8 wt.% Hexadecane. -Product,. isolated from the acetonitrile solution phase, weighs 4 g and contains 99.8% by weight of tetradecanol.

The degree of separation of tetradecanol

45 99.8%, Hexadecane 99.3%.

PRI me R 5. 100 ml of hexadecane containing I wt.% C-Cg-alcohol -. washed with 50 ml of a 0.5 molar solution of aluminum bromide in acetone.

50 nitrile, and the hydrocarbon phase is washed with 100 ml of water to remove acetonitrile impurities. A hexa decane is obtained containing less than 0.03% by weight of alcohol impurities.

55 The use of solutions, the concentration of which is .0.3 mol / l, does not give an effective purification by a single extraction, and the concentration

3.1213019

About 5 mol / l does not cause a noticeable release of the desired product until the degree of purification increases. 99.6-99.9% and СK. To reduce the time spent on the use of the proposed method of the extraction process for 3 min.

Claims (1)

METHOD FOR SEPARATING ALIPHATIC Сg-Сig-alcohols AND Cj-C jo “—HYDROCARBONS by processing their extra-. gate - a solution of a metal salt in an organic solvent at 2040 ° C with subsequent separation of the resulting hydrocarbon and alcohol layers, characterized in that, in order to increase the degree of purification and reduce processing time, 0.3-0.5 I are used as an extractant a solution of aluminum bromide in acetonitrile or its mixture with petroleum ether at a volume ratio of a solution of aluminum bromide in acetonitrile and; petroleum ether equal to> (1-2).: (1-10). SU - 1213019 Ί 12