How to recover n-hexane extracted from oil and fat? Luoyang Wohong condensation membrane separation has mature solutions

How to recover n-hexane extracted from oil and fat? Luoyang Wohong condensation membrane separation has mature solutions

In the oil extraction industry, n-hexane is the core solvent. After extracting oil from oilseeds in the leaching workshop, a large amount of n-hexane evaporates and is lost with the exhaust gas. This solvent is not cheap, and direct discharge is not only a waste of resources, but also faces environmental pressure.

The traditional recycling method mainly relies on two-stage condensation, and the condensed exhaust still contains a certain amount of n-hexane, which has an impact on the environment when directly discharged. The condensation membrane separation combination process of Luoyang Wohong is to add a membrane separation unit on the basis of the original condensation system to further treat the exhaust gas.

The process flow is as follows: the waste gas containing n-hexane in the leaching workshop is first cooled by a condensing unit, and most of the n-hexane is liquefied and recovered. The uncondensed exhaust gas enters the membrane module and utilizes the difference in permeation rate between n-hexane molecules and air molecules in the membrane material - n-hexane preferentially penetrates to form concentrated gas, which is sent back to the front end of the system for circulation and treatment, and the air is discharged in compliance with standards. This design utilizes the original condensation system as a pre-treatment unit for the membrane system, without affecting the normal production of the workshop.

From the actual effect, the n-hexane recovery device using this combination process can significantly reduce solvent loss in the exhaust gas. The membrane module adopts a modular design and can be installed at the back end of existing condensing systems, which is fast to install and does not occupy additional space. The recovered n-hexane is directly reused in the extraction process, reducing raw material procurement. Luoyang Wohong can provide targeted renovation plans based on the membrane component specifications matched with the exhaust concentration and air volume of the oil factory.