SU406868A1 - METHOD OF DESTRUCTION OF OIL EMULSIONS .- ^, p'fii? ^ H ^ ''? P5 :: dtP! 1 vUi -.> &. /; ^ • ..iJ-iriUU - Google Patents

Description

The invention relates to the field of destruction of oil emulsions and can be used in the processes of dehydration and desalting of oils. A known method for the destruction of petroleum emulsions is by introducing into the emulsion a demulsifier based on an alkyl aryl sulfonate obtained from a pyrolysis resin. However, the use of this demulsifier leads to contamination of wastewater, since they have a low biological oxidability, moreover, this demulsifier is not sufficiently effective in breaking down resistant oil emulsions. In order to eliminate these drawbacks, according to the invention, a mixture containing (wt.%) 75--80 MONO-, 15-18 di- and 5-10 trialkylaryl sulphonates with a molecular weight of 400-750 is used as a diamulsifier, preferably the demulsifier is introduced as an emulsion its aqueous solution in the oil product, for example, naphtha, catalytic cracking reflux, gasoline, tegroine. The monoalkylaryl sulfonate included in this mixture has alkyl substituents Cb – Cgt, the dialkyl arylsulfonate contains alkyl substituents in the sum of Ci – C28, and the trialkylaryl sulfonate contains alkyl substituents in the amount of Ci5 – Cso. Alkylaryl sulfonate is synthesized by alkylation of benzene or toluene with α-olefins of the normal structure of the fraction 30-250 ° C with molar ratios of the components, sulfonation of the products obtained by oleum and neutralization of alkylbeacon sulfonic acids with NaOH or Ca (OH) 2. Unlike LCCs and sulfonols having a molecular weight of 300-350, the molecular weight of the proposed sodium salt is 400-450, the calcium salt 700-750. Alkylaryl sulfoate is highly soluble in water, as it is a mixture of mono-, di-, and trialkylaryl sulphonates. A study of the biodegradability of the drug in wastewater showed that the degree of biodegradation of alkylaryl sulfonate at its initial concentration of 10-20 mg / l is 95-85%. The ratio of components (alkylaryl sulfonate and oil products) in the demulsifier is determined by the nature of the emulsion oil. The consumption of petroleum product reaches 5%, the consumption of water-soluble alkyl aryl sulfonate is 0.01-0.03% for oil. The presence in the composition of a water-soluble alkylaryl sulfonate and petroleum products gives the demulsifier versatility with respect to all petroleum emulsions.

When an emulsion is destroyed with the molecular adsorption character of the protective film, an alkyl aryl sulfonate plays a major role.

In the case of high tar oils with a protective film character, the oil product is essential. Depending on the nature of the emulsion in the composition, the ratio of alkylaryl sulfonate and oil product varies from 1: 300 to 1: 500.

The method of demulsification using the proposed demulsifier is as follows.

In the original emulsion oil, the demulsifier in the form of an aqueous solution of an alkyl aryl sulfonate in an oil product is fed, with stirring, uniformly with stirring; the contact time is 10 minutes, the contact temperature is 65-70 ° C, then the oil is allowed to settle for 4-5 hours, the separated water is drained, and the oil is analyzed.

The studies were carried out on the most resistant oil emulsions of Azerbaijan: NPU “Buzovneft” fields, NPU “Artemneft”, NPU “Shirvaniaft”.

The results of demulsification are given in table. 1 and 2.

Oil NPU "Artemneft"

NCHK Sa

Alkylaryl Sulfonate (Calcium Salt)

The proposed composition alkylarylsulfonate (calcium salt) + naphtha

Oil NPU Shirvanneft

NaCs Na

Alkylaryl sulphonate (sodium salt) Proposed composition of alkyl aryl sulphonates (sodium salt) + naphtha

Oil NPU “Buzovneft”

NaCs Na

Alkylaryl sulfonate (sodium salt)

The proposed composition alkylarylsulfonate (sodium salt) - | -naft

Table 1

table 2

1.5-2.0

1.0-1.2 0.4-0.8

0.8-1.2

1.4-1.52

0.2-0.6 5 Subject of the invention 1. Method of destroying oil emulsions by applying an alkyl aryl sulfonate based emulsion to the emulsion, 5 characterized in that, in order to prevent contamination of wastewater, a mixture containing (weight .%) 75-80 MOIA-, 15-18 di- and 5-10 trialkylaryl sulfonates with a molecular weight of 400-750. 2. A method according to claim 1, characterized in that the demulsifier is introduced in the form of an emulsion of its aqueous solution in the oil product.