Method for extracting oil in spent bleaching clay by ultrasonic assisted isohexane

Abstract

The invention provides a method for extracting oil in spent bleaching clay by ultrasonic assisted isohexane. Under the oscillation and cavitation action of ultrasonic waves, oil adsorbed in the spent bleaching clay is fully extracted in the isohexane, thus fulfilling the aim of increasing the oil extraction rate. The method comprises the following steps: dispersing the spent bleaching clay into the isohexane, uniformly mixing, extracting the oil adsorbed in the spent bleaching clay into the isohexane under the synergistic action of ultrasonic treatment, heating and stirring, performing washing and centrifugal solid-liquid separation on an oil-removed bleaching clay system obtained by filtration, and drying and grinding obtained solid products, thus obtaining regenerated bleaching clay. According to the method, the oil in the oil spent bleaching clay can be extracted to the maximum extent, so that the extraction time is shortened, and the maximum oil extraction rate is 97 percent; meanwhile, after being regenerated, the spent bleaching clay can be used for brickmaking by filling and repeatedly used, so that the aim of recycling economy is fulfilled. The method has an important significance for oil and fat refining.

Description

Technical field: [0001] The invention relates to the field of oil processing technology, in particular to the recovery of oil from oil-containing waste clay produced after oil refining and the reuse of waste clay, which improves the economic benefits of enterprises and reduces environmental pollution caused by the discharge of waste clay. Background technique: [0002] After industrially using activated clay to adsorb and decolorize oil, due to the physical properties of activated clay, limitations of equipment and technology, there are about 20% to 48% of oil in the decolorized waste clay. The treatment method of most oil factories is to mix it with coal to make fuel or to bury it and discard it. This kind of treatment is not only a waste of resources, but also causes environmental problems. Spontaneous combustion will often occur, which brings huge safety hazards to production and life. [0003] At present, there are two common ways to regenerate waste clay. One is to use...

AI Technical Summary

Problems solved by technology

The treatment method of most oil factories is to mix it with coal to make fuel or to bury it and discard it. This kind of treatment is not only a waste of resources, but also causes environmental problems. Spontaneous combustion often occurs, which brings huge safety hazards to production and life

[0003] At present, there are two common ways to regenerate waste clay. One is to use high-pressure pressing to squeeze out the oil and then package it for landfill. This method does not recycle waste clay, and the pressing method can only extract About half of the oil is squeezed out, and most of the oil is still in the clay, and the mechanical equipment used is expensive and easily damaged; another method is the boiling method, that is, adding the waste clay to hot water, adding sodium carbonate, sodium hydroxide, etc. Alkaline substances can boil the oil in the waste clay. This method produces a large amount of waste water, and the oil yield is not high. Generally, only two-thirds of the oil in the waste clay can be extracted. The waste clay cannot be regenerated, and the structure is damaged. destruction, so the law has been eliminated