Technique for distilling oil from waste carclazyte by extraction method and device thereof

Abstract

The invention relates to a technique to extract oils and fats in waste bentonite by solvent extraction directly and devices thereof. Processing steps are to preheat the waste bentonite with oils and the solvent to 50-55DEG C respectively, drop the waste bentonite with oils and the solvent into extracting machine with putting-down trap valve in ration, extract the mixed oils with the oils and fats and the solvent after at least twice immersions, feed the turbid mixed oils with the solvent into the mixed oils tank, and the mixture is dropped into evaporators for evaporating after settling down again, then filterable oils with standard quality can be recycled. After extracting from the net bucket detearing conveyors and exsolution from desolventizer, the purer waste bentonite can be achieved. The solvent air can be reused after condensating water and recycling. The invention is simple in technology, distinct in device, lower in production cost, and high in extraction efficiency, which is safe, reliable energy-conservational and environment-friendly. The invention with highly economic and social value applies to not onlythe petroleum chemical industry, but also the treatment of the waste bentonite in the vegetable oil processing industry.

Description

technical field [0001] The invention relates to a process and a device for directly extracting oil and fat from waste clay by solvent extraction. Background technique [0002] Existing decolorizing waste bleaching clay is the leftovers produced during the decolorization of vegetable oil industry oil refining and petrochemical industry mineral oil (motor oil, other mineral oil) refining decolorization, accounting for about 2.5% of the oil refining output. Its main ingredient is white clay (aluminum silicate) plus the oil, pigment, impurities, etc. it absorbs. The color is white, light gray, light brown, etc. depending on the place of origin. After absorbing oil, it is blue or brown. The amount varies. When the Ama filter is used, it is mostly powdery, and there is a small amount of fast. When using a plate and frame filter, some are fast and some are muddy. Those with high oil content may leak oil from the soil. The oil content in the decolorized waste white clay is generall...

AI Technical Summary

Problems solved by technology

Its resources cannot be effectively recycled

[0006] Current situation of solvent extraction method: using the existing extraction technology and equipment in the oil industry, because the mixed oil of solvent and oil is mixed with waste clay to form a slurry after oil extraction with waste clay, it is difficult to separate, so industrial production is very difficult

There is another method that mixes clay with water and waste clay, extrudes it into flakes with a screw, and then soaks it in a solvent after drying. The disadvantages of this method are: (1) The cost of clay is high; (2) It needs to be dried to remove water; (3) The output is low and the energy consumption is high, so it is difficult to be used in industrialized production

The Chinese invention patent No. 02126737.5 discloses the "waste white clay dry oil extraction process", which uses a ring die to granulate the binder and uses a solvent extraction with a tank-type extractor. Although this process solves the problem of white clay and mixed oil Separation problem, but also there are following deficiencies: (1) binding agent is the clay powder that has extracted oil, raw material and binding agent are by weight 1: 0.1-0.4, that is: the clay powder after having extracted oil has 10%- 40% is used for bonding and granulation, which reduces the production output of oily waste clay by 10%-40%, resulting in low output and high energy consumption; The cost is high, resulting in high cost of oil extraction; (3) Put the oily clay made into granules into the leaching tank, and the material is sent into the solvent for soaking in a static state. Due to the large compression ratio of granulation, the solid granules and the solvent penetrate into the interior The route is long, resulting in low extraction rate and poor effect; (4) Taking advantage of the easy separation of particles and mixed oil, the mixed oil is collected from the bottom. When the compression ratio of the particles is not enough to disperse and form a slurry, the equipment cannot separate the mixed oil. , after the oil extraction, the white clay is discharged from the tank in an open manner, and the dust has a great impact on the production environment, and there will be unsafe hidden dangers in the open discharge

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