SU958474A1 - Process for deparaffinating oil fractions - Google Patents

Description

IoOrs-enns relates to transport and, in particular, to paraffin extraction of oil fractions. There is a known method for dewaxing oil fractions of various solvents, including dismounting of fr.1CCH1II with a solvent, heating to complete dissolution, and cooling it with an eatom, until it crystallizes a cable-like amount of paraffin and separates it from the suspension using filter l. In spite of the prevalence of sparaffinum, which is soluble, this method is characterized by limited process productivity. The filtration rate of the suspension depends primarily on the size and shape of the solid paraffin crystals. Very small bistro crystals clog up the filters, which often requires stopping and washing the filters, and large crystals tend to form a gelatinous mass, which can be washed with great difficulty and speed of filtration and increases the oil yield, it results in sizes, it) and page ptbJ crystal paraffins. Various depressant compounds can be used as deparphinurers of dsb-shock: product J condensation of chloroparaffin with naphthalene, copolymers of:) tylene, N-olefikop, poly tacrylates t2. The known method of “paraffinization of oil fraccides with the use of an additive, after the step-up, is a synergistic mixture of oxidized, and then reduced, ethylene copolymer with ci-oleFII with x-pp parzpholine condensation with aromatic hydrocarbon (paraflou), and the components of param- wide limits: from 1 to 99% by weight of one komlontom Z .; The use of a single sulphate ionizing agent of ethanol with s-lofin does not bark; living rosul-tlto11. Oxidation and restoration of polymorphism is very inefficiently reducing the number of L1T-v process activity d: parfin1 zlc (P1. I L1gi copolymer mixture can allow h (, 1.t;

1.15 times, and out:) D oil on 1-2 mas.1 with the introduction of 0.04% additive.

 The closest to the proposed technical result and the achieved result is a method of dewaxing oil fractions with a solvent in the presence of a dewaxing additive and - a product of thermal degradation of ethylene-propylene copolymer with a molecular weight of 2000-7000, (SKEP-R) with thermal after-treatment. , cooling and filtering it 4.

However, the filtration rate and yield are not high enough.

 The invention is the creation of an effective method for dewaxing oil fractions, which provides a high filtration rate and oil yield.

This goal is achieved by the fact that according to the method of dewaxing oil fractions by mixing them with a solvent in the presence of a dewaxing additive, followed by heat treatment of the mixture, cooling and filtering it, the ethylene copolymer with propylene is used as a dewaxing additive with molecular weight 5600070000 in the amount of 0.04-0.5 wt.%.

The additive is obtained as follows.

Ethylene is copolymerised with propylene in the medium of propylene on the catalyst — vanadium triacetone acetonate in combination with diisobugyl aluminum aluminum chloride (DIELH) or diethyl aluminum chloride (DELH) at 0O – C – lOl C, the content of ethylene in 4–6%; from 8: 1 to 10: 1, The process is carried out in the presence of a volorod-regulor molecular weight copolymer. The partial daplcio of his is changed in the reactor from 0.5 to 1.5 atm. After the copolymorizacin regime has matured, 10 g / h of DELH is continuously fed to the reactor: 3.6 g / h of vanadium acetonate tris-tetra. You get a copolymer with MM from 56000 to 70,000 of the following composition by mole.%.: Propylene 45-48, ztilenia 55-52. Copolymers were obtained on an experimental continuous installation with a capacity of 15–20 kg / h for the copolymer.

Leppraffinization is subjected to distillate and residual raffinate refined paraffinic oils, whose properties are listed in Table. one.

Doparaffinization of oil raffinates is carried out in -1 way.

vacuum, obtaining solutions of paraffin and dewaxing oil, which are then separated from the solvent.

The distillation raffinate dewaxing is carried out in a mixture of selective solvents: acetone: toluene (40:60), taken in an amount of 35 P. mas.% Relative to the raffinate at minus 25 ° C; and the residual raffinate is in a mixture of acetone: toluene (30:70), taken in an amount of 400 wt.%. These modes provide for the production of oils with a freezing point of minus 15 s.

The invention is illustrated by examples. In all examples, copolymers (EPDM) are introduced in a quantity of 0.04; 0.1; 0.15; 0.3; 0.5 wt.% From raw materials.

Example 1. The required amount of ethylene-propylene copolymer containing 45 mole.%

0 propylene and 55 mole% ethylene, with MM 56000 added at 60 ° C to the residual raffinate, then, after dissolving the solvent, heat treating and cooling to - filter 5 under vacuum.

Example 2. The dewaxing process is carried out similarly to pgimera 1, but as an additive prt, the ethylene-propylene copolymer with MM 56000 is changed,

0 containing 46 mole.% Propylene and 52% mole. ethylene.

Example 3. Dewaxing is carried out in the same way as npso-iepy 1. As an additive, ethylene 5 propylene copolymer is used with MM 7OOOOO, containing 15 mol. % propylene and

55 wt.% Ethylene. "

Example 4. Diffraction

O was taken up from analogue of Example J. As the most advanced ethylene-propylene copolymer with W 700G, salt 48 mol.% Propylene, i and 52 mol. I ethylene.

The results of graduation from the 5 hj in table 2.

EXAMPLE 5 Ethnlen-propyloxy copolymer with a molecular mass of 56000, containing 45 mol.% Of propylene and 55 mol.% Of ethylene, is added.

0 d styllitol endfinate at 50-60 ° C and diluted with a solvent, consisting of 140% by weight and 60% by weight of toluene, taken to a volume of 350 mol.%. Then, the resulting rlst5 aor is subjected to heat treatment at 60 ° C for 60 minutes and cooled to a temperature of filter. Ee.

Example 6, p 6. The dewaxing is carried out analogously to Example 5, but also

An ethylene-propylene copolymer with MM 56000 containing 48 mol.% Of propylene and 52 mol.% Is used as an additive. ethylene.

As an additive, these are used; A flax-propylene copolymer with a molecular weight of 70,000, containing 45% by weight of propylene and 55 mole% ethylene.

Example 8. The dewaxing was carried out analogously to example 5, but an ethylene-propylene copolymer with a molecular weight of 70,000 containing 48 mol.% Of propylene and 52 mol.% Of ethylene was used as the additive.

The results of distillation raffinate dewaxing are summarized in Table. 3

Comparative Dannis with the method of the prototype are given in table. four.

The advantages of the proposed method as compared with that of the invention are that the used deparaffinizing additive is obtained on the basis of cheap and readily available meters, using a simple technology that makes it possible to easily adjust the process parameters, allows

0 to improve the performance of the dewaxing process of the residual and distillate components in terms of filtration rate and oil yield.

Table 1

Continuation of taOl 2

T a o l and c a

Duration of the table. 3

Table