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REAGENT PREPARATION FOR OIL TREATMENT AND ITS USE IN THE PROCESS OF DEHYDRATION

Abstract

Due to high stability of water-oil emulsions stabilized by natural surfactants and resins, their destruction can only be achieved with the help of demulsifiers. The consumption of the demulsifier is determined by the need to obtain commercial oil with a water content of less than 0.2%, at a higher water content, the cost of oil on the market is reduced, and at 1% oil is considered substandard. Since the cost of demulsifiers is quite high (1.5-2.8 thousand dollars per ton), the problem of reducing their consumption due to the increase in the efficiency of reagents and reducing the cost is very relevant. The aim of the work is to obtain a reagent-demulsifier based on fatty acids of cottonseed oil and to study the possibility of its use for dehydration of crude oil. It was determined the most favorable regimen of neutralization and separation of fatty acids of gossypol resin which subsequently provides the greatest yield of demulsifier. Oxyethylated derivatives of fatty acids and gossypol contained in the product isolated from the saponified gossypol resin were obtained by the action of ethylene oxide on it. To obtain reagent-surfactant on the basis of isolated fatty acids with high demulsibility, it is required to obtain an optimal ratio of the number of hydrophilic and hydrophobic groups (hydrophilic-lipophilic balance). Surfaceactive properties of reagents prepared by hydroxyethylation of AF and containing a different number of ethylene oxide groups were investigated. Analysis of the values of surface activity showed that the investigated demulsifier variants have similar surface activity values, but the maximum value was obtained with 70% ethylene oxide content. It has been established that the purity of the initial AFs also affects the demulsifying activity of oxyethylated derivatives, a pronounced deviation in the properties of the product obtained on the basis of purified AFs with an impurity content of about 1.2-1.3% is observed. The maximum value of the amount of water released from water-oil emulsions under these conditions is 94% with a content of 60% ethylene oxide in the reagent. The remaining versions of the raw material provide a water separation of 91% with an ethylene oxide content of 70%. The possibility of using a new raw material – purified fatty acids of gossypol resin – for the synthesis of nonionic demulsifiers of the "Gossilvan" series by the method of oxyethylation is shown. When the reagent "Gossilvan" is used in the amount of 30-60 g/m3 the residual water content in oil is reduced to 0.08-0.5%, salts – to 60-210 mg/l, oil in water – to 50-170 mg/l, that is, the obtained "Gossilvan" reagent is a demulsifier which provides a good degree of desalting and dehydration at a flow rate of 30-60 g/m3 of crude oil.

KAZIM S. NADIROV, GULNAZ ZH. MOLDABAYEVA, SALTANAT E. BAIBOTAYEVA, YURY V. ZEYGMAN AND AYNUR S. SADYRBAYEVA

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