Method for extracting conversion biodiesel from oil pressing cake

Abstract

The invention relates to a method for extracting transformation biodiesel from oil-bearing press cake and solves the problems of complex pretreatment and high energy consumption, etc. of the prior art which mainly adopts animal and vegetable oil as raw materials. The invention realizes direct pressing of shelled oilseeds or unshelled oilseeds through a low-temperature screw oil press or a common oil press to obtain press cake and expressed oil; the press cake is leached out through adopting organic solvent with the leaching out solvent ratio ranging between 0.8:1 and 2.0:1 and the leaching out time ranging from 60 min to 200 min; the leached out oil mixtures is converted into 60 percent to 90 percent concentrated oil mixtures after evaporation or cooling and separation, while the leached out wet meal containing solvent is converted into degreased meal with the residual oil rate being less than or equal to 1 percent after exsolution; catalyst which accounts 1 percent to 10 percent of the weight of the concentrated oil mixtures is added in the concentrated oil mixtures for biodiesel transformation with the products separated to obtain biodiesel crude product and glycerol; finally, the biodiesel crude product is made into biodiesel product after distillation. The invention which omits steps such as steam stripping and refining has the characteristics of simple process and low energy consumption, etc.

Description

technical field [0001] The invention relates to a processing method of an oil press cake, in particular to a method for preparing biodiesel and defatted meal by using the oil press cake as a raw material in one step, and belongs to the field of agricultural product processing. Background technique [0002] The seeds of oil crops are pressed to obtain pressed cake and pressed oil. In the current oil processing industry, the pressed cake is usually extracted with No. 6 solvent oil, and the extracted crude oil is refined to obtain different grades of extracted oil to enter the market. my country is a big oil producing and consuming country, and leaching oil occupies a considerable proportion in the consumption of edible oil in my country. Since solvent extraction is used in the leaching process, on the one hand, it is inevitable that there will be residual solvent in the oil. Even the refined first-grade oil usually contains about 3mg / kg of solvent residue (the national standar...

AI Technical Summary

Problems solved by technology

Since solvent extraction is used in the leaching process, on the one hand, it is inevitable that there will be residual solvent in the oil. Even the refined first-grade oil usually contains about 3mg / kg of solvent residue (the national standard is regarded as undetected). The latest research by the US FDA shows that No. 6 solvent residue Eating will cause adverse effects on human health; on the other hand, the mixed oil obtained by leaching needs to go through steps such as steam stripping and refining to obtain edible oil, which will bring a certain amount of energy loss

[0003] At present, the technology of preparing biodiesel with oil as raw material has matured, and it is gradually moving toward large-scale production. Although waste oil, fatty acid or animal and vegetable oil can be used as raw material for the preparation of biodiesel, the amount of waste oil and fatty acid is limited, and animal and vegetable oil needs to be produced. Refining and other steps increase consumption

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