CN-121975584-A - Light-colored rice bran wax acid wax and preparation method thereof

CN121975584ACN 121975584 ACN121975584 ACN 121975584ACN-121975584-A

Abstract

The application provides a preparation method of light-colored rice bran wax acid wax, which comprises the following steps of deoiling, soaking deoiled and uncoloured rice bran wax in ethyl acetate, heating, melting, cooling and slicing for standby, oxidizing, heating sliced rice bran wax and dilute sulfuric acid to melt the rice bran wax, adding sodium bichromate solution, continuously stirring, naturally cooling and standing to separate the wax and chromium slurry solution, washing with acid, heating oxidized rice bran wax into liquid, adding dilute sulfuric acid, stirring, standing to separate the wax and the dilute sulfuric acid solution, adding water, heating while stirring until the wax is completely melted, continuing stirring, standing to separate the wax and the water washing solution, cooling the upper oxidized rice bran wax, slicing and packaging. The application also provides a light-colored rice bran wax acid wax. The rice bran wax acid wax is oxidized by sodium bichromate to generate light-colored, odorless and hard rice bran wax acid wax, so that micromolecular substances are effectively removed, the emulsifying property and glossiness are obviously improved, and deep processing is facilitated.

Inventors

QIU SANMING
QIU TINGYUAN

Assignees

重庆合才化工科技有限公司

Dates

Publication Date: 20260505
Application Date: 20180102

Claims (3)

1. The preparation method of the light-colored rice bran wax acid wax is characterized by comprising the following steps of: Deoiling, namely firstly placing the deoiled and undeloured rice bran wax into a stainless steel reaction kettle, soaking the rice bran wax for 4 hours through ethyl acetate with the concentration of 99.7%, then opening a valve below the stainless steel reaction kettle, pumping the ethyl acetate into a storage tank, distilling and recovering the ethyl acetate, heating the deoiled rice bran wax to 90-100 ℃, melting the rice bran wax, and cooling and slicing the rice bran wax for later use; Oxidizing, namely putting sliced rice bran wax and dilute sulfuric acid into an enamel reaction kettle together, heating to 90-100 ℃ to melt the rice bran wax, then adding sodium bichromate solution with the concentration of 50% for oxidation, keeping the temperature at 90-100 ℃ and continuously stirring, changing the color of the rice bran wax from brown to light color, naturally cooling, standing for 1-2 hours to enable the wax and the chromium slurry solution to be layered, enabling chromium slurry at the lower layer of the reaction kettle to enter a residual liquid kettle, and pumping oxidized rice bran wax at the upper layer into another enamel reaction kettle; Washing with acid, namely putting oxidized rice bran wax into another enamel reaction kettle, heating to 90-100 ℃ to liquefy the oxidized rice bran wax, putting dilute sulfuric acid into the kettle, stirring for 0.5-1 hour, standing for 1-2 hours to separate the wax from the dilute sulfuric acid solution, returning the pickling solution at the lower layer of the reaction kettle to an oxidation process, adding water, heating to 90-100 ℃ while stirring until the wax is completely melted, continuing stirring for 0.5 hour, standing for 1-2 hours to separate the wax from the washing solution, preparing dilute sulfuric acid by using the washing solution at the lower layer of the reaction kettle together with concentrated sulfuric acid, and cooling the oxidized rice bran wax at the upper layer to obtain the light-colored rice bran wax.
2. The method for producing light-colored rice bran wax acid wax according to claim 1, wherein the concentration of dilute sulfuric acid in the oxidation step and the acid washing step is 50%.
3. A light-colored rice bran acid wax, characterized in that the light-colored rice bran acid wax is produced according to the light-colored rice bran acid wax production method of claim 1 or 2.

Description

Light-colored rice bran wax acid wax and preparation method thereof Technical Field The invention relates to the technical field of new materials, in particular to light-colored rice bran wax acid wax and a preparation method thereof. Background The rice bran wax is crystalline wax in rice bran oil, is a byproduct wax paste obtained by dewaxing the rice bran oil, contains 30-50% of the rice bran oil, and is deoiled by a solvent method to obtain crude rice bran wax with the oil content of less than 5%. The main component of the crude rice bran wax is long-chain fatty acid ester composed of higher fatty acid alcohol and higher fatty acid, and also contains other various pigments, gums and other small molecular components. The refined rice bran wax is generally prepared by deoiling first by a solvent method and then bleaching with hydrogen peroxide to obtain pale yellow refined rice bran wax. However, the inventors of the present invention have found that the light-colored rice bran wax obtained by this method is hardly removed due to small molecular substances such as resins, and thus the product is tacky, and has an influence on hardness and gloss, and has a strong taste, thereby limiting the range of use. Disclosure of Invention Aiming at the technical problems that the existing refined rice bran wax has the problems of stickiness, influence on hardness and glossiness and strong taste due to the existence of small molecular substances such as resin and the like, and the application range is limited, the invention provides a preparation method of light-colored rice bran wax acid wax. In order to solve the technical problems, the invention adopts the following technical scheme: The preparation method of the light-colored rice bran wax acid wax comprises the following steps: Deoiling, namely firstly placing the deoiled and undeloured rice bran wax into a stainless steel reaction kettle, soaking the rice bran wax for 4 hours through ethyl acetate with the concentration of 99.7%, then opening a valve below the stainless steel reaction kettle, pumping the ethyl acetate into a storage tank, distilling and recovering the ethyl acetate, heating the deoiled rice bran wax to 90-100 ℃, melting the rice bran wax, and cooling and slicing the rice bran wax for later use; Oxidizing, namely putting sliced rice bran wax and dilute sulfuric acid into an enamel reaction kettle together, heating to 90-100 ℃ to melt the rice bran wax, then adding sodium bichromate solution with the concentration of 50% for oxidation, keeping the temperature at 90-100 ℃ and continuously stirring, changing the color of the rice bran wax from brown to light color, naturally cooling, standing for 1-2 hours to laminate the wax and the chromium slurry solution, enabling chromium slurry at the lower layer of the reaction kettle to enter a residual liquid kettle, pumping oxidized rice bran wax at the upper layer into another enamel reaction kettle, and completing the oxidation step in two steps, wherein the hydrolysis reaction is carried out in the first step, the hydrolysis reaction is carried out in the formula of R 1-COOC-R2⇌R1-COOH + R2-CH2 OH, and the oxidation reaction is carried out in the second step, and the oxidation reaction is carried out in the formula of ：R2-CH2OH+Na2Cr2O7 +3H2SO4→R2-COOH+H2O+2Cr(OH)SO4+Na2SO4; Washing with acid, namely putting oxidized rice bran wax into another enamel reaction kettle, heating to 90-100 ℃ to enable the oxidized rice bran wax to become liquid, putting dilute sulfuric acid into the kettle, stirring for 0.5-1 hour, standing for 1-2 hours to enable the wax and the dilute sulfuric acid solution to be layered, returning the pickling solution at the lower layer of the reaction kettle to an oxidation process, adding water, heating to 90-100 ℃ while stirring until the wax is completely melted, continuing stirring for 0.5 hour, standing for 1-2 hours to enable the wax and the washing solution to be layered (the wax and the water are insoluble, the specific gravity of the wax is light on the upper layer, the specific gravity of the water is heavy on the lower layer), preparing dilute sulfuric acid by using the washing solution at the lower layer of the reaction kettle together with concentrated sulfuric acid, and cooling the oxidized rice bran wax at the upper layer to obtain the light-colored rice bran wax acid wax. The purpose of the water washing in this step is to wash off sulfuric acid and obtain oxidized rice bran wax. Further, the dilute sulfuric acid concentration in the oxidation and acid wash steps was 50%. The invention also provides a light-colored rice bran acid wax, which is prepared according to the preparation method of the light-colored rice bran acid wax. Compared with the prior art, in the preparation method of the light-colored rice bran wax acid wax, after the rice bran wax is subjected to oxidation reaction by the strong oxidant sodium bichromate, the main component of the rice bran wax is chan