Vim li cas thiaj hais rau "subcritical" es tsis yog supercritical?
1. Kub:Lub subcritical butane / propane system tuaj yeem ua tiav kev rho tawm ntawm 30-50 degree, uas yog 10-20℃qis dua cov supercritical CO₂ (feem ntau ntau dua lossis sib npaug li 50 degree), thiab yuav luag tsis muaj kev puas tsuaj rau thermal rhiab heev ntawm flavonoid aglycones; tus nqi khaws cia ntawm -cedrol tau nce 8-12% raws li ntsuas.
2. Siab:0.3-0.6 MPa yog txaus rau kev ua haujlwm. Cov phab ntsa tuab ntawm cov cuab yeej yog 40% tsawg dua li ntawm cov txheej txheem supercritical, thiab nrog tib lub peev xwm tsim khoom 1 t / hnub, kev nqis peev rau tag nrho cov kab raug txo los ntawm 55%.
3. Kev xaiv:Butane ib txhij dissolves tsis muaj zog polar flavonoids thiab sandalwood volatile roj, tab sis tsis yooj yim rub tawm lignin macromolecules. Cov theem tom ntej desolventization tshem tawm qhov xav tau rau "kho cov quav tshem tawm" kauj ruam.
Txheej txheem khiav - Yuav ua li cas Peb Hloov Los ntawm "Pib" mus rau "Gel"
① Raw khoom pretreatment:Cov dej noo ntawm sandalwood yog tsawg dua lossis sib npaug li 10%. Cov khoom yog khov thiab lub cev qhuav dej rau -40 degree, ces hauv av rau 40-60 mesh. Lub cell phab ntsa tawg tus nqi nce 30%. Lub tooj dag polishing khib nyiab raug tshem tawm los ntawm synchronous sib nqus sib cais los tiv thaiv cov dej hauv qab.
② Subcritical extraction:Cov khoom siv -rau- hnyav piv yog 1: 1.1. Tom qab txhaj cov kuab tshuaj mus rau hauv lub tank extraction nyob rau hauv lub nqus tsev vacuum ntawm -0.085 MPa, cov txheej txheem yog nqa tawm 30 feeb ib ncig, nrog countercurrent 4 zaug. Txoj kev butane muaj qhov kub ntawm 35℃thiab lub siab ntawm 0.45 MPa; Cov txheej txheem CO₂ muaj qhov kub ntawm 28℃thiab lub siab ntawm 20 MPa, nrog rau qhov ntws ntawm 5 kg / h.
③ Txo -siab evaporation:Lub compressor thiab dej kub ntawm 55℃yog ua ke rau vaporization. Qhov concentration ntawm cov roj sib xyaw nce mus rau 65%. Cov roj hnyav yog liquefied thiab rov qab los. Lub siab seem nyob rau hauv lub thoob dej yog tsawg dua los yog sib npaug rau 5 kPa. Qhov kev tso tawm yog nqa tawm tom qab qhov kev xeem tawg tau tsim nyog.
④ Tsawg-kub desolvation:Lub tsho yog nyob ntawm 45℃thiab lub tshuab nqus tsev yog -0.08 MPa. Cov kuab tshuaj seem hauv cov pluas noj yog txo kom qis dua 200 mg / kg, uas tuaj yeem siv ncaj qha los ua cov roj boiler lossis cov khoom siv roj carbon activated.
⑤ Paste concentration:Luv -lub sij hawm evaporation ntawm 70℃→ Sandalwood tooj dag extract (flavonoids Ntau dua los yog sib npaug rau 8.8 mg QE / 100 g, polyphenols Ntau dua los yog sib npaug rau 4.1 mg GAE / 100 g, sandal cawv Ntau dua lossis sib npaug li 50%), nrog nitrogen sealing thoob plaws hauv cov txheej txheem. Cov xim hloov ΔE yog tsawg dua lossis sib npaug rau 1.5.
Subcritical low-temperature extraction tsis yog "low-temperature gimmick", tab sis yog "golden daim duab peb sab" ntawm kub, siab, thiab hnyav polarity:
- Kub<50 degree, tiv thaiv vanillin los ntawm decomposing;
- Siab< 0.6 MPa, preventing the brass tank from deforming;
- Solventkaw - voj voog ncig
