Raw wool treating supercritical CO2 process

Abstract

The raw wool treating supercritical CO2 process includes the following steps: 1. depurating raw wool; 2. extracting depurated raw wool with supercritical CO2 to obtain lanolin and degreased wool. The supercritical CO2 process has the conditions, including extraction pressure 30-40 MPa, extraction temperature 60-75 deg.c, the first stage separation pressure 9-10 MPa, the first stage separation temperature 45-50 deg.c, the second stage separation pressure 5-6MPa, and the second stage separation temperature 36-42 deg.c. The present invention has simple technological process, high product yield, environment friendship, low cost and high product quality.

Description

technical field [0001] The invention relates to a method for directly processing raw wool to extract refined lanolin and degreased wool, in particular to a method using supercritical CO 2 Process for processing raw wool to extract refined lanolin and skimmed wool. Background technique [0002] Wool is a high-grade textile material. The raw wool cut from sheep contains 9% to 12% lanolin. The wool used as raw material for wool spinning should be degreased wool with a fat content equal to or lower than 1% after the lanolin is removed from the raw wool. The raw wool should be processed. The first purpose of the processing is to obtain degreased wool with a fat content equal to or lower than 1%, and then to obtain lanolin. Lanolin is a natural substance with relatively complex components. The refined lanolin has good water absorption, wettability, film-forming property, lipophilicity, emulsification and dispersibility. It does not crystallize at low temperature and has bacteric...

AI Technical Summary

Problems solved by technology

[0003] 1. There are many steps to process raw wool and the process is complicated;

[0004] 2. Washing the raw wool with a detergent solution to make the fat content of the degreased wool after washing equal to or lower than 1% requires a lot of water and detergent, otherwise the degreasing of the raw wool will not be clean. The quality of degreased wool is not high, the waste of fresh water resources and the consumption of a large amount of detergent;

[0005] 3. A large amount of wool washing wastewater is high-concentration organic wastewater, which mainly contains lanolin and detergent, and also contains impurities such as sheep sweat, sheep manure, grass clippings and sediment. Lanolin is in an emulsified suspension state due to emulsification and saponification Mixed with impurities, it is highly turbid and difficult to separate. The method for extracting crude lanolin from wool washing wastewater with the above separation method has a low yield, and the yield is only 10% to 45%. Some methods have complicated processes and high costs. The efficiency is low, and a large amount of waste water that is difficult to reuse is produced after extracting crude lanolin. The BOD and COD values ​​in the waste water are high, the treatment is difficult, and the environment is greatly polluted after discharge;

[0006] 4. The method for refining crude lanolin is complicated in process, high in cost and low in yield, and the refined lanolin obtained contains a solvent of a balanced amount, and the product quality is poor