Cov cuab yeej ntsuas kev lag luam no yog ntau yam. Nws muaj peev xwm ua tau zoo supercritical multi- kua stepwise extraction, recombination extraction, extraction thiab rov qab los ntawm cov tshuaj lom Cheebtsam, raws li zoo raws li extraction thiab rov qab ntawm ultra- tsis tshua muaj kab. Nws kuj txhawb rectification, extractive distillation, thim rov qab extraction, kua-kua extraction, extraction ua ke nrog freezing crystallization. Tsis tas li ntawd, lub kaw lus tau kaw tag nrho thiab tso cai rau kev ncig ntawm ntau cov kuab tshuaj. Hauv kev ua zaub mov noj qab haus huv, nws ua rau cov khoom lag luam puffing, decolorization, desulfurization, deodorization, coloring, thiab flavoring.
Cov txheej txheem supercritical kua extraction muaj peb qhov tseem ceeb, uas ua haujlwm raws li hauv qab no:
(1) Cov kua dej supercritical yog muab los ntawm cov cuab yeej siv uas suav nrog lub tank tso tawm, lub siab - lub twj tso kua mis siab, thiab lwm yam khoom siv. Lub luag haujlwm tseem ceeb ntawm chav tsev no yog hloov cov extractant los ntawm nws tus qauv ntsuas kub thiab lub xeev siab mus rau hauv lub xeev supercritical kua.
(2) Cov kua dej supercritical extraction seem yog tsim los ntawm cov qauv rho tawm cov hlab ntsha thiab cov khoom siv sib txuas. Hauv theem no, supercritical kua extractant dissolves lub hom phiaj solute los ntawm cov qauv matrix. Raws li cov kua circulates, cov kua dej solute -laden fluid yog cais los ntawm cov qauv matrix.
(3) Cov dej sib cais thiab adsorption seem muaj lub nozzle thiab lub raj nqus dej. Txhawm rau cais cov kua dej tawm los ntawm cov kua dej supercritical, ob qho tib si dhau los ntawm lub nozzle, qhov kev txo qis hauv siab thiab qhov kub thiab txias rov qab los rau cov txheej txheem kub thiab siab. Nyob rau theem no, cov kua dej volatilizes thiab raug tshem tawm. Cov kua nplaum yog adsorbed rau saum npoo ntawm cov khoom ntxeem tau ntim hauv lub raj nqus dej. Los ntawm kev yaug lub raj nqus dej nrog cov kuab tshuaj uas tsim nyog, cov kuab tshuaj tuaj yeem raug eluted, sau, thiab npaj rau kev siv tom ntej.