SU683634A3 - Method of dehydrating petroleum - Google Patents

Description

(54) METHOD FOR OIL DECOMPOSITION

The invention relates to the oil producing and refining industries and can be used to dehydrate crude freshly produced oil by introducing a demulsifier.

There is a known method of oil dehydration, where block copolymers of ethylene oxide and / or 1,2-propylene are used as a demulsifier.

The disadvantage of this method is the low degree of oil dehydration and the impossibility of using a demulsifier to destroy water-in-oil emulsions.

The closest to the technical essence is the method of dehydrating crude oil by introducing polyalkylene polyamine as a demulsifier, completely in each case 30-300 times oxyalkylated at nitrogen atoms and containing at least two repeating alkylaminophenes in a molecule.

However, in this method, the dehydrated oil contains residual water (in a measurable amount).

The aim of the invention is to increase the degree of oil dehydration.

An objective goal is achieved by the described method of oil dehydration by introducing a demulsifier of a compound of the general formula

(SPNgPO); (H iCnHinQ) xH 1СпН7.пО), chI (-CHjCH - N - CKHCH-T -CHNCHN-) gt1- (CfbRO) m CHjCHjCHj

where X is 10-300;

„9g.

m 10-3000.

The invention is illustrated by examples

the results of which are tabulated, and the procedure for the complete conversion of polyalkylenepolyamines to the quaternary state is also introduced.

Well known compounds are recommended as transfer agents to the quaternary compound: alkyl halides - methyl chloride, methyl bromide and iodide

ethyl, primarily benzyl chloride or dimethyl sulfate, of which the most important is dimethyl sulfate. In the case of methyl halides or dimethyl sulfate, compounds are converted.

methyl to quaternary products, technologically especially valuable.

The demulsifier is used to achieve more convenient dosing in the form of solutions. The solvents used are mainly water or organic solvents in which quaternary salts are still soluble. Such solvents include, for example, tetrahydrofuran, d.ioxane, lower alcohols - methanol, ethanol, isopropanol, or n- or isobutanol.

Method of converting polyalkylene polyamines to the quaternary state.

To a mixture consisting of 294.55 g (0.05 mol) of polyalkoxylated polyethylene, 38 mol of ethylene oxide and 72 mol of propylene oxide (cf. Example 1, Table 1) per unit of ethyleneimine under an atmosphere of NS at 60 ° C, added 6.3 g (0.05 mol) of dimethyl sulfate at 60 ° C. Then additionally stirred for 3 hours at 60-65 ° C.

The demulsifier is added in the emulsion of crude oil for 1-200 hours, preferably 10-100 hours, based on the weight of the splittable emulsion at 10-80 ° C.

The demulsifiers used according to the present invention can be used for water-in-oil emulsions containing about 0.1-90% by weight of saline water.

USSR crude oil 42% HjO. Test with stirring at 80 ° C Crude oil from North-West Germany 42% HjO.

PEI 500 20, OE 80, OPR

PEI 500 20, OE 80, Opr is converted to the quaternary compound dimethyl sulfate.

Crude oil from Nigeria 30% HjO. Tested at 30 ° C

15 2 7 25 30

Note. The total ethyleneimine has an average molecular weight of 1000, which has reacted 38 moles of ethylene oxide (OE) and 72 moles of propylene oxide (OPr).

It is preferable to use for dewatering the oil of the northern and north-western regions of the Federal Republic of Germany and the USSR.

The splitting of water-in-oil emulsions is carried out without supplying additional heat within the temperature range very quickly with almost full output. If, in the event of difficulties, it is necessary to use

electrochemical or chemical installations, splitting is carried out in a few minutes, at worst in 1-2 hours.

In all cases, splitting produces separated water, which can be sent to waste water outlets, since it does not contain oil.

As a control, simple block copolymers of ethylene oxide and propylene, as well as oxyalkylated polyalkylenepolyamines not converted to quaternary compounds, according to HGF distribution N ° 2227546, are used. In the examples, it is shown that the same, but split water using the old splitters still contains oil. Varieties from northern and northwestern regions are used as oil.

Germany and from the USSR of various origins and different water contents.

Table I

50 18 Tests on prn stirring at 60 ° С

56

USSR crude oil 42 HgO. Reverse experiment at 80 ° C Syrau oil from the north-eastern part of Germany 42% Noo.

PEI 500, 5 OE, 6 OP PEI 500, 100 OE, 150 OP

 In the form of a quaternary salt. For samples not converted to the quaternary compound, the content of the residual oil rose to 200 liters. per million. Cheese oil USSR 38%. Mixing test at

683634

table 2

Table 3 Reverse experiment at 60 ° C

Example. Oil of different origin is treated with oxyalkyl polyethylene amines, converted to the quaternary state and not translated into this state. At the same time, a certain amount of the product (in ppm) is added to the samples while stirring, after which the mixing is continued. Then, after uniform intervals, otsh, enlenny water are determined, after otsh, the amount of residual water is deposited, and the residual oil in water is also determined. The results are given in table. 1, 2 and 3.

Claims (2)

1. US patent number 3964478, CL. 128.203, publ. 1977. 2. The patent of Germany No. 2227546, cl. 23 B105, published. 1976.