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

 

(57) Abstract:

The inventive receiving extractant aromatic hydrocarbons from their mixtures with normal hydrocarbon timestribune acetone mixture of formaldehyde and alkaline sulfide effluent containing 0.2 to 3 wt. sulfide and 0.2 to 5 wt. mercaptan sulfur in the mass ratio of acetone: formaldehyde: sulphur (total) equal(1,875 2,375) (0,975 1,1) 1, and a temperature of 55 to 65C. table 3.

The invention relates to the refining and petrochemical industry, in particular to a technology for new petrochemical products based on waste production, and can be used in the refining and petrochemical industries. The resulting mixture metasulfite is of practical value and can be effectively used as a solvent of aromatic hydrocarbons.

The known method [1] obtain metasulfite by condensation of acetone with a mixture of formaldehyde and concentrate diallyldisulfide with tKip.110-160aboutWith a product of oxidative sweetening of hydrocarbons in aqueous-alkaline medium and at a molar ratio of the components of the concentrate (Stotal) formaldehyde:acetone equally the

Also known method [2] production of concentrates of ketosulfone by condensation of acetone with a mixture of formaldehyde and gas condensate or oil containing mercaptan sulfur (0.2 to 0.6), in aqueous-alcoholic medium at room temperature (205) in the presence of caustic soda and triethylmethylammonium chloride (TEBAH) sulfuric acid with subsequent selection of the target product. Condensation occurs within 5-15 min at a mass ratio of the condensate (oil):TEBAH 100:(0,02-0,1).

The concentrates obtained by known methods, are used as extractants of platinum and palladium from hydrochloric acid solutions.

The use of concentrates metasulfite in the extraction processes is unknown. Often for the extraction of aromatic hydrocarbons using sulfolane, diethylene glycol and other solvents [4,5]

Known methods for producing metasulfite not can be widely used in industry due to their complex technological design, which is to use spiritualresearch solutions necessary extractive extraction from the reaction mixture and the catalyst.

In addition, research conducted by the authors, PI, mutually dissolved and may not be used as extractants.

The purpose of the invention to provide a simple way concentrate metasulfite, expanding the range of substances extractants aromatic hydrocarbons, regeneration sulfide-alkali wastewater.

Getting concentrate metasulfite is achieved by timestribune ketone, acetone with a mixture of formaldehyde and sulphide alkaline waste water (BOILING) containing mercaptan (0.2 to 5 wt.) and sulfide (0.2 to 3 wt.) ions at 605aboutC for 5 h and the mass ratio of acetone: formaldehyde: sulphur, equal(1,875-2,375):(1,1-0,975):1. Used in the reaction of sulfide-alkali wastewater Orenburg gas processing plant are pale yellow liquid with a pungent characteristic odor, a density of 1.1 g/cm3. The component composition of the wastewater are shown in table.1.

BOILING represent an environmental hazard. Currently BOILING pumped into underground aquifers or burned, polluting while ground water and air.

A distinctive feature of the proposed method is to obtain a concentrate of ketosulfone on the basis of sulphide alkaline waste water, which are mixed with formald the proposed method is manufacturability and ease the exception spiritualresearch reagents catalysts and extractants, availability BOILING, the possibility of carrying out the process on an industrial scale. It should be noted that at the same time obtaining valuable product to the question of the regeneration of the sulphide alkaline waste water, which leads to improvement of ecological situation and allows you to return to the alkaline solution in the process.

The target product is a mixture of ketosulfone is a liquid light brown characteristic of which is shown in table.2. The output of ketosulfone sulphur is 91,25-97,5 on BOILING 14,5-of 18.4 wt. The content of total sulphur 31,1, sulfide 27,3 wt.

Tests showed that metasulfite obtained on the basis of BOILING, effectively extracted aromatic hydrocarbons. So, removing ketosulfone benzene and o-xylene from a mixture with the Dean (composition of mixtures: 20-25% aromatic hydrocarbon 80-75 Dean) is 85,4 and 52.5 per cent respectively (see example 2 and 3).

Thus, the proposed method timestribune acetone mixture of formaldehyde and BOILING formed when cleaning a wide fractions of hydrocarbons from mercaptans and hydrogen sulfide, allows to obtain an effective extractant aromatic hydrocarbons and simultaneously regenerate alkaline, the alkaline waste water, containing 0.7 wt. sulfide. ions and 3.9 wt. mercaptide ions. The total sulfur content of 4.6 wt.

Into the flask under stirring served 17.0 g of 30% formalin solution containing 5.1 g of pure formaldehyde and 9.8 g of acetone.

The mixture was stirred at 605aboutC for 5 h Control on the completeness of the reactions carried out by potentiometric titration sulfur mercaptan and hydrogen sulfide ammirata of silver nitrate. The results of the analysis indicate that after 1 h of stirring, the conversion of sulfur is 95.6 wt.

Residual total contents mercaptan and sulfide ions does not exceed 0,35 wt. (PL.3). After mixing, the mixture is transferred into a separating funnel. After stratification (2-3 h) separate the lower aqueous alkaline layer. Target product remaining in the funnel, use as directed. The alkaline solution after parki is returned to the process. The output of concentrate metasulfite is 18.4 g, which is in the calculation of the sulfur is 95.6 wt.

The results of the experiment are given in table.3.

The effectiveness of the proposed solvent (extractant) concentrate ketosulfone (PL.2) with respect to aromatic hydrocarbons is illustrated by the following is reaped of 4.57 g of a mixture of 20 wt. benzene (0,914 g) + 80 wt. dodecane) and of 5.83 g metasulfite. The volumetric ratio of solvent:the raw material is 1:1. This mixture of raw material and solvent was stirred at room temperature 20-25aboutWith and advocated for 1 h to transparency of both the raffinate and extract phases. The obtained phase weighed; the composition of the phases was determined by the method of IR-spectroscopy and gas-liquid chromatography. The results of the experiment only once in the funnel extraction: extract weight phase 4,3428, raffinates 5,33334. Benzene content is in phase extract 18,0% (0,781 g), raffinates 2,49% (of 0.133 g).

The selectivity of the extractant (ketolides) is estimated by the ratio of the number of benzene in extract phase (0,781 g) the number of benzene in the initial mixture (0,914 g) and is 85,4%

P R I m e R 3. In the conditions of example 2 artificial mixture containing 25% of o-xylene and 75% of the Dean, took the number was 7.45 g (UAH 1,862 g o-xylene) and metasulfite 11,85 was Obtained extract phase 9,2105 g, raffinates 9,7609, the Analysis showed that the content of o-xylene in the extract phase is 10.5% (0,967 g), rafinate phase 9,16 wt. (0,895 g). Checkout depth of o-xylene represents 52.5%

The METHOD of extracting AROMATIC HYDROCARBONS FROM THEIR MIXTURES WITH NORMAL is result mixture of formaldehyde and sulfide-alkali wastewater, containing 0.2 to 3 wt. sulfide and 0.2 to 5 wt. mercaptanes sulfur, and the process is carried out at a mass ratio of acetone formaldehyde sulfur (total) equal 1,875 2,375 0,975 1,1 1, and a temperature of 55 to 65oC.

 

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