Ultrafiltration concentration and centrifugal separation combined process for lanolin extraction

Abstract

The invention relates to an ultrafiltration concentration and centrifugal separation combined process for lanolin extraction. The ultrafiltration concentration and centrifugal separation combined process comprises the following steps: wool is washed in a multi-stage circulating manner: multiple stages of wool washing tanks are arranged to wash the wool, the wool is conveyed from the first-stage wool washing tank to the final-stage wool washing tank, and washing water flows from the final-stage wool washing tank to the second-stage wool washing tank in a countercurrent manner for mechanical application; rotary cross-flow type ultrafiltration membrane rotating discs are arranged in an ultrafiltration concentration tank and used for ultrafiltration concentration, a concentrated solution enters the next step, water after ultrafiltration returns to the third-stage wool washing tank through a reflux pump for reuse; the concentrated solution is precipitated in a grit chamber, and large-particle impurities are removed; the concentrated solution is heated in a heating tank; the heated concentrated solution is subjected to residue-water-oil three-phase separation through a three-phase centrifuge. The ultrafiltration concentration and centrifugal separation combined process for lanolin extraction has the advantages as follows: the recovery rate of the lanolin can be increased obviously, the cyclic utilization rate of the washing water is increased, fresh water and detergent are saved, the emission and pollutant concentration of wool washing wastewater are reduced, and load for follow-up sewage treatment is reduced.

Description

technical field [0001] The invention belongs to the field of textiles, in particular to a wool scouring process in textiles, in particular to a combination process of ultrafiltration concentration and centrifugal separation for lanolin extraction. Background technique [0002] At present, there are many methods for extracting lanolin from wool washing water, including centrifugation, air flotation, coagulation, extraction, ultrafiltration, etc. Among them, centrifugation is the most widely used method in China. The washing water from the wool scouring process is first pretreated by sand settling, then heated to about 85°C, and then enters a three-phase centrifuge for centrifugal oil extraction, in which the slag phase is discharged, the water phase returns to the wool scouring process, and the oil phase is recovered. The recovered oil phase is heated to about 85°C, and the oil and water are separated again to recover the crude lanolin. The technical process of this method i...

AI Technical Summary

Problems solved by technology

However, due to the hollow fiber membrane or frame-type flat membrane equipment currently used, in the case where the wool washing water cannot be aerated, it cannot withstand the harsh environment such as fine mud, grease, and residual wool, and it is very easy to occur in the recycling operation. jam

Frequent clogging, backwashing, chemical cleaning, membrane module replacement, etc., limit its industrial application

[0004] In particular, many of the ultrafiltration concentration experiments that have been carried out are all based on the water phase or slag phase of the centrifuge as the concentration object, trying to concentrate the water and / or slag after centrifugal oil extraction to a certain level by ultrafiltration and then re-concentrate. For centrifuge oil extraction, since a large part of the lanolin after sand settling, heating, centrifugation and other processes has been absorbed by fine sand, it is difficult to achieve the desired effect by ultrafiltration concentration

Therefore, there is no successful industrialization case of traditional ultrafiltration technology applied to lanolin extraction in wool scouring process

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