EVALUATION OF PETROLEUM AS EXTRACTOR FLUID IN LIQUID-LIQUID EXTRACTION TO REDUCE THE OIL AND GREASE CONTENT OF OILFIELD PRODUCED WATER

EVALUATION OF PETROLEUM AS EXTRACTOR FLUID IN LIQUID-LIQUID EXTRACTION TO REDUCE THE OIL AND GREASE CONTENT OF OILFIELD PRODUCED WATER

Oil and grease

Petroleum industry

Gasoline

Efficiency

Naphthenic acids

pH

Oil fields

Liquids

Solvent extraction

Water treatment

Produced Water

Organic acids

Effluents

Produced water treatment

Real effluent

Synthetic effluent

This work aims to evaluate the use of petroleum as a solvent in the liquid-liquid extraction of oil and grease content from oilfied produced water. Initially, tests were performed with synthetic effluent, using cyclohexanecarboxylic acid as model compound through the study of physical-chemical parameters: pH, temperature, stirring speed and time, petroleum type and concentration, and initial concentration of naphthenic acids. Afterwards, the process was evaluated for the removal of oil and grease content from a real oilfield produced water sample. The pH and petroleum concentration proved to be significantly influential in removing cyclohexanecarboxylic acid from the synthetic produced water (ANOVA). The greater the amount of petroleum present, the greater the efficiency. By acidifying the synthetic effluent, the efficiency of removing these naphthenic acids from the synthetic produced water was increased. Response surface methodology (RSM) evaluated these two factors. On the other hand, the initial concentration of cyclohexanecarboxylic acid and petroleum type did not presented great influence on the obtained results, indicating robustness of the process. The methodology carried out with synthetic effluent proved to be efficient in removing the oil and grease content from real effluent (≈ 60% of removal at pH range 2-5).

Process Safety and Environmental Protection

2022

2022-03-17

de Carvalho Neto, Sálvio Lima

Toledo Viviani, Juliano Cesar

Weschenfelder, Silvio Edegar

da Cunha, Maria de Fatima Rodrigues

Orlando Junior, Aloisio Euclides

dos Santos Costa, Byron Rosemberg

Mazur, Luciana Prazeres

Marinho, Belisa Alcantara

da Silv, Adriano

de Souz, Antônio Augusto Ulson

de Souz, Selene Maria de Arruda Guelli Ulson

journalArticle

0957-5820

10.1016/j.psep.2022.03.041

https://www.sciencedirect.com/science/article/pii/S0957582022002543