The method of extracting aromatic hydrocarbons from their mixtures with normal hydrocarbons

 

(57) Abstract:

The inventive method of extracting aromatic hydrocarbons from their mixtures with normal hydrocarbons are dimethylaluminum methyl ethyl ketone mixture of formaldehyde and sodium sulfide when their molar ratio, respectively, equal to(1,5 2,5) (1,5 2,5) 1, temperature 15 to 25C for 1 7 h 3 PL.

The invention relates to the refining and petrochemical industry, in particular to a technology for obtaining new petrochemical products, and can be used in oil refining, petrochemical and gas industry.

The proposed reagent (extractant) declassified are of practical value and can be effectively used as a solvent of aromatic hydrocarbons. Now for the extraction of aromatic hydrocarbons using sulfolan, triethylene glycol, diethylene glycol. The most effective extractant sulfolan. However, in industry it is not possible, and purchased abroad.

Known methods for producing derivatives diketones, for example, 3-tialsin-1,4-dicarbonyl compounds [1] methylenedianiline cyclohexanone derivatives [2] izvestnyh methods of obtaining lies in the interaction of the source of the diketone with thiols (C3or4). Also known is a method of obtaining 3-mercapto-2,5-hexandione [6] where serosoderjaschei reagent used toluxury acid in ether. A common disadvantage of known methods is the difficulty of obtaining the original diketones and toxic mercaptans. Getting declassified, for example 2,21-dicyclohexylurea, probably by the reaction of 2-chlorocyclohexanone with an excess of sodium sulfide in water-methanol medium at 15about[7] the Disadvantage of this method is the use of hard-to-reach 2-chlorocyclohexanone, low yield of the target product.

Closest to the proposed method to the technical essence and the achieved result is a method of obtaining 4-mercapto-2-butanone based on methyl vinyl ketone are and sodium sulfide in an aqueous environment [7] the Process proceeds according to the scheme

CH3--CH CH2CH3--CH2-CH2SH+ (CH CH2CH2)2S

The result is 4-mercapto-2-butanone is the main reaction product. Declassified is formed as impurities. The disadvantage of this method is the low output declassified. The use of declassifed synthesized by known methods, is connected to osnovnoe aromatic hydrocarbons is unknown.

The aim of the invention is to increase the output of declassified, using available ketones, expanding the range of substances that selectively dissolving aromatic hydrocarbons.

This objective is achieved in that the methyl ethyl ketone is subjected to condensation with a mixture of formaldehyde and sodium sulfide in an aqueous-alkaline medium within 1-7 hours at 205aboutWith a molar ratio of methyl ethyl ketone formaldehyde: sulphur(1,5-2,5):(1,5:2,5):1.

The invention consists in that timelineview subjected to methyl ethyl ketone mixture of formaldehyde and an aqueous-alkaline solution of sodium sulfide.

The process of timestribune is at 205aboutC for 1-7 h at a molar ratio of components equal to(1,5-2,5):(1,5-2,5):1. When the reduction ratio of the reactants and the reaction time decreases the output declassifed to 50.9% increase reagents more than 2.5 moles is impractical because it does not increase the yield of the target product and the degree of conversion.

A distinctive feature of the proposed method is to obtain declassified through the implementation of the reaction of methyl ethyl ketone with sodium sulfide in the presence of formaldehyde.

The advantage of predlagaemogo as serosoderjaschei reagent along with reactive sodium sulfide can be used exhaust alkaline solution after the absorption of hydrogen sulfide. In the reaction of the spent alkaline solution is regenerated and can be returned into the process of gas purification from hydrogen sulfide, which is also a significant advantage of this method. The use of the proposed method will allow the complex to solve the issue for cleaning gases from hydrogen sulfide, the regeneration of the alkaline solution with obtaining useful substances extractant aromatic hydrocarbons.

P R I m m e R. In a round bottom flask, equipped with a mechanical stirrer, make 50 g of sodium sulfide dissolved in 100 ml of distilled water. The content of sulfide ions is 2.93 wt. The sulfur content in the solution is 4,395 g or 0,137 of moles. Into the flask under stirring serving 5 grams of caustic soda, a 27.4 g of 30% formalin solution containing by 8.22 g (0,274 moles) of pure formaldehyde and 19.7 g (0,274 mole) of methyl ethyl ketone. The mixture is stirred for 7 hours Control on the completeness of the reactions carried out by potentiometric titration with ammirata of silver nitrate. The results of the analysis show that after 7 h of stirring, the conversion of sulfur is 58.8 Rel. The residual sulfur content is 1,207 wt. After mixing, the mixture is transferred into a separating funnel. After settling (1 h) separate the body and combined with the organic layer. After removal of the solvent gain of 13.0 g of the target product. Product feature below.

Content wt. WITH 55,71; N 7,24; S 13,95; 21,81;Sself12,5; SMerck0,055; Mol.weight 261; density, g/cm31,279; the refractive Index 1,5132.

Dissolving and extracting the ability to concentrate declassifed in relation to aromatic hydrocarbons is illustrated by the following examples.

P R I m m e R 2. In a separating funnel download (0.15 g) artificial mixture consisting of n-decane (20%) and benzene (20%), and as the extractant declassified in a volume ratio of the raw material and the extractant is 1:1. Temperature 20 5aboutWith the atmospheric pressure, the number of stages of contact is equal to 1, the mixing time of 15 minutes After intensive mixing, the mixture defend Divided 1 tsp extract and rafinate phase is weighed and analyzed by gas chromatography. The material balance and the results of the analysis are given in table. 3.

P R I m e R 3. Conducting experience in the conditions of example 2, as an artificial mixture charge mixture consisting of 75% of the Dean and 25% toluene. Data of the experiment are given in table. 3.

P R I m e R 4. Conducting experience in the conditions of example 2 to claim the respect of aromatic hydrocarbons in the extract phase and in raw materials. So for benzene, toluene and o-xylene extraction at a single extraction is 56,0; 86,0 and 53.2 Rel. respectively (table.3).

The METHOD of extracting AROMATIC HYDROCARBONS FROM THEIR MIXTURES WITH NORMAL HYDROCARBONS on the basis of the ketone and sodium sulfide with water, characterized in that the methyl ethyl ketone is subjected to timelineview mixture of formaldehyde and sodium sulfide in a molar ratio of initial reagents, respectively 1,5 2,5 1,5 2,5 1 15 25oC for 1 to 7 hours in an aqueous-alkaline medium.

 

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