Technology for preparing walnut oil

Abstract

A disclosed technology for preparing walnut oil specifically comprises the following steps: (1) frying with fire: frying with an electric temperature-control frying pan; (2) rolling by stone, sieving materials at the edge of the mill disc; (3) steaming the material thoroughly with steam in a cage; (4) encircling with eulaliopsisbinata: using eulaliopsisbinata to cover the steamed material and preparing cake blanks; (5) performing physical squeezing to obtain crude oil and cakes; and (6) processing crude oil: performing primary filtering, first-stage precipitation, second-stage precipitation and third-stage precipitation to obtain walnut oil. The characteristics of the technology comprise: one frying one steaming, two-time sterilization, two-time (impure) flavor removing, physical squeezing and the natural method; the steaming processing helps to improve oil extraction rate by about 4%; the technology overcomes the disadvantages of some destroyed nutritive indexes and secondary pollution exhibited by a raw-kernal squeezing method and a solvent extraction method; the technology helps to guarantee natural mature fragrance characteristic and stability of walnut oil, and helps to improve oil extraction rate and production efficiency, wherein the oil extraction rate is 50% or more; and the walnut oil as well as the cakes are obtained, so that the added value is improved.

Description

technical field [0001] The invention relates to a process for preparing walnut oil. Background technique [0002] Walnut, also known as walnut, is listed as the world's four major dry fruits together with almonds, cashews, and hazelnuts. Walnut kernels are extremely nutritious, containing 17%-27% protein, 10% carbohydrates, and 60%-70% fat, ranking first among all woody oils and known as "the oil depot on the tree". [0003] Walnut oil is rich in essential polyunsaturated fatty acids such as linoleic acid and linolenic acid, especially the content of linolenic acid in walnut oil is significantly higher than that of several common vegetable oils. In the past 15 years, American scientists have done a lot of research on the nutritional value of walnuts And clinical research on the multiple functions of edible walnuts. In January 2009 and August 2009, the American California Walnut Committee released two clinical research reports on the efficacy of special ingredients in walnu...

AI Technical Summary

Problems solved by technology

Supercritical CO 2 The optimal process conditions for extracting walnut oil are: extraction pressure 30MPa, temperature 50°C, CO 2 The flow rate is 20 L / h, the time is 2 hours, the suitable pulverization method is hammer pulverization, and the product meets the national edible oil standard; supercritical fluid extraction technology has incomparable advantages such as simple process and convenient operation; it overcomes the solvent extraction method In the separation process, distillation heating is required, oil is easy to oxidize and rancid, and there are solvent residues. It also overcomes the disadvantages of low yield and cumbersome refining process of hydraulic pressing. However, due to the influence of many factors such as expensive equipment and unqualified key parts, etc. , the technology has been limited in its transfer to production