SU1675322A1 - Method of producing solid hydrocarbons - Google Patents

Abstract

The invention relates to petrochemistry, in particular to the production of solid hydrocarbons. The goal is to increase the separation rate and improve the quality of the hydrocarbons produced. The preparation is carried out by blending gacha or petrolatum with an organic solvent, heat treating the mixture with the addition of ceresin (0.0005-0.01% by mass), cooling the mixture and separating to give solid hydrocarbons. The method allows increasing the filtration rate by 29.2%, lowering the oil content by 2-3 times and increasing the melting point of the solid hydrocarbon by 0.5-2 ° C. 2 tab.

Description

The invention relates to the field of oil refining, in particular to a method for separating solid petroleum hydrocarbons.

The purpose of the invention is to increase the speed of separation of a suspension of solid hydrocarbons while simultaneously improving the quality of solid hydrocarbons (ceresin and paraffin): by increasing their melting point and reducing their oil content.

The method includes the following steps: treating petrolatum or gacha with an organic solvent, heat treating the mixture obtained, adding ceresin in the amount of 0.0005-0.01 wt.%, Cooling the mixture and separating it with the release of solid hydrocarbons.

The method is carried out as follows.

Raw materials - gach or petrolatum, diluted with a solvent, which can be used as a mixture of methyl ethyl ketone (MEK) and toluene in the ratio gach: solvent 1 6 or petrolatum: solvent 1 8, and heat-treated the mixture at 55-65 ° C until complete dissolution solid hydrocarbons. After heat treatment, the required amount of ceresin, previously dissolved in the mixture of solvents IEC – toluene, is introduced into the solution. The resulting solution is cooled with constant stirring at a rate of 120 ° C / h. At the final temperature of cooling to 0-9 ° C for suspension of cacao and 20-25 ° C for suspension of petrolatum after 5-10 min of thermostating, the suspension is separated by filtration under vacuum at a residual pressure on the filter of 0.4 MPa.

The raw material used is petrolatum and gach. Petrolatum is characterized by the following parameters: density 847 kg / m, kinematic viscosity at 100 ° С 14.8 mm2 / s, melting point 67 ° С, refractive index ПД70 1.4605 and contains according to the structural group analysis, wt.% Pclfino naphthenic USPP

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levodoroda 91.2; aromatic substances 8.1; resinous substances 0.7.

Gach is characterized by the following indicators: density 831.5 kg / m, Ps 1.4590, melting point 52.4 ° C, contains wt.%: Paraffin-naphthenic hydrocarbons 71.2; light aromatic hydrocarbons 16.3; average aromatic substances 11.1; heavy aromatic substances 0.3; resinous substances 1.1.

Ceresin is a cristaplastic product with a dropping temperature of 57-85 ° C and a molecular weight above 500, which includes naphthenic, aromatic hydrocarbons with long alkyl chains, as well as high molecular weight paraffinic hydrocarbons. or isostructures.

Example 1.50 g of petrolatum is diluted with 483 ml of solvent — an MEK – toluene mixture, taken in a ratio of 60:40 vol.%, Heated to 65 ° C and ceresin with a molecular weight of G86 is added in a small amount of MEK – toluene (5 ml) in the amount of 0.0005 g. The solution is cooled to 25 ° C at a rate of 120 ° C / h with stirring and then the resulting suspension is separated by filtration; the filtration rate is 144 kg / h under vacuum at a residual pressure of 0.4 MPa. The yield of ceresin is 12 g (24 mab.%), The melting point of ceresin is 78 ° C, and the oil content is at CeresicO.86%.

EXAMPLE 2 50 g of hacha is diluted with 363 ml of MEK – toluene solvent, taken in a ratio of 60:40 vol.% And heated to 50 ° C. After heat treatment, ceresin 80 was added to the mixture, dissolved in a small amount of MEK – toluene solvent (3 ml) in an amount of 0.01 wt.%. The solution is cooled to 0 ° C with constant stirring at a rate of 120 ° C / h. Suspension of solid hydrocarbons in a solvent filtered

under vacuum at a residual pressure of 0.4 MPa. The output of paraffin 14.8 g (29.7 wt.%). filtration rate 127 kg / mh, melting point 60.8 ° C, oil content

0.32 wt.%.

Example 3. 50 g of petrolatum are diluted with 480 ml of solvent — an MEK-toluene mixture, taken in a ratio of 60:40 vol.%, Heated to 60 ° C and ceresin is introduced into 8 ml

solvent (MEK - toluene 60:40 vol.%) in an amount of 0.01 wt.% - 0.005 g. The solution is cooled to 25 ° C at a rate of 200 ° C / h with stirring and then the mixture is separated under vacuum at residual pressure 0.35 MPa. The filtration rate is 68 kg / m2 h, the melting point of ceresin is 77 ° C, and the oil content is 1.8% by weight.

The results of de-oiling petrolatum of a mixture of West Siberian oils, carried out under conditions analogous to example 1, and dehydration of the gach fraction of 420-500 ° C of a mixture of West Siberian and Ukrainian oils, carried out under conditions analogous to example 2, are given in Table. 1 and 2.

According to the table. 1 and 2, the use of ceresin additive allows to increase the filtration rate by 29.2%, lower the oil content by 2-3 times and increase

melting point of solid hydrocarbon at 0.5-2 ° C.

Claims (1)

The invention of the method for producing solid hydrocarbons by blending gacha or petrolatum with organic solvent, heat treatment of the mixture with the addition of a modifying additive, cooling the mixture and separation with the release of solid hydrocarbons, characterized in that In order to increase the speed of separation and improve the quality of the hydrocarbons produced, ceresin is used as an additive in an amount of 0.0005-0.01 wt.%. table 2 Indicator Cresores obtained from this petrolatun Concentration is 1 ml. 0.001 0.01 kopcci b jit. 1 G1 .1ap: 1, kg / m h 98.5 L, P Ceresin yield (paraffin), we are 24.9  pp. Tyleng nfriosi iia (pagRfmchp), g /, /, //, 8 Splgr, anise 1, gpa n gerseg.n j (drug), hour,% (1.01.8 The original Gach I Gach with the addition of ceresin 80 O0,00050,0010,01 108,0116,0124,0127.0 29,530,530,229,7 60,260,360,660,8 0,600,490,300,32