Antifoamers yog siv los txo qhov nro ntawm cov dej, kev daws teeb meem thiab kev ncua, tiv thaiv kev ua npuas ncauj, lossis txo cov npuas dej thaum lub sij hawm tsim khoom. Common Antifoamers yog raws li nram no:

I. Natural Oil (xws li Soybean Oil, Pob Kws Roj, thiab lwm yam)

Qhov zoo: muaj, raug nqi thiab siv tau yooj yim;

Disadvantages: Nws yog ib qho yooj yim rau deteriorate thiab nce cov kua qaub yog tias tsis khaws cia zoo.

II.High Carbon Cawv

Cov pa roj carbon ntau yog cov kab hluav taws xob uas muaj zog hydrophobicity thiab tsis muaj zog hydrophilicity, uas yog ib qho zoo antifoamer hauv dej. Cov nyhuv antifoaming ntawm cawv muaj feem xyuam rau nws cov solubility thiab diffusion hauv foaming tov. C7 ~ C9 yog qhov zoo tshaj plaws Antifoamers. Cov pa roj carbon ntau ntawm C12 ~ C22 yog npaj nrog cov khoom tsim nyog emulsifiers nrog particle loj ntawm 4 ~ 9μm, nrog 20 ~ 50% dej emulsion, uas yog, defoamer hauv dej system. Qee cov esters kuj muaj cov nyhuv antifoaming hauv penicillin fermentation, xws li phenylethanol oleate thiab lauryl phenylacetate.

III.Polyether Antifoamers

1. GP Antifoamers

Ua los ntawm kev ntxiv polymerization ntawm propylene oxide, los yog sib tov ntawm ethylene oxide thiab propylene oxide, nrog glycerol ua tus neeg sawv cev pib. Nws muaj qhov tsis zoo hydrophilicity thiab tsis muaj solubility nyob rau hauv foaming nruab nrab, yog li nws yog tsim nyog los siv nyob rau hauv nyias fermentation kua. Txij li thaum nws muaj peev xwm antifoaming yog superior rau ntawm defoaming, nws yog tsim nyog yuav tsum tau ntxiv nyob rau hauv lub basal nruab nrab los inhibit lub foaming txheej txheem ntawm tag nrho cov txheej txheem fermentation.

2. GPE Antifoamers

Ethylene oxide yog ntxiv rau qhov kawg ntawm polypropylene glycol saw txuas ntawm GP Antifoamers los tsim polyoxyethylene oxypropylene glycerol nrog hydrophilic kawg. GPE Antifoamer muaj hydrophilicity zoo, muaj zog antifoaming muaj peev xwm, tab sis kuj muaj cov solubility loj uas ua rau lub sij hawm luv luv ntawm kev ua haujlwm antifoaming. Yog li ntawd, nws muaj txiaj ntsig zoo hauv viscous fermentation broth.

3. GPEs Antifoamers

Ib qho thaiv copolymer nrog hydrophobic chains ntawm ob kawg thiab hydrophilic chains yog tsim los ntawm sealing cov saw kawg ntawm GPE Antifoamers nrog hydrophobic stearate. Cov molecules nrog cov qauv no zoo li sib sau ua ke ntawm cov roj-kua interface, yog li lawv muaj kev ua haujlwm zoo ntawm qhov chaw thiab kev ua haujlwm zoo defoaming.

IV.Polyether Hloov Silicone

Polyether Modified Silicone Antifoamers yog hom tshiab ntawm kev ua haujlwm siab defoamers. Nws yog tus nqi zoo nrog rau qhov zoo ntawm qhov zoo dispersion, muaj zog ua npuas ncauj inhibition muaj peev xwm, ruaj khov, tsis muaj tshuaj lom thiab tsis muaj mob, tsis muaj zog thiab muaj zog Antifoamers muaj peev xwm. Raws li kev sib txawv hauv kev sib txuas hom, nws tuaj yeem muab faib ua ob pawg hauv qab no:

1. Copolymer nrog -Si-OC- daim ntawv cog lus npaj nrog acid raws li catalyst. Cov defoamer no yooj yim rau hydrolysis thiab muaj kev ruaj ntseg tsis zoo. Yog tias muaj amine tsis nyob, nws tuaj yeem khaws cia ntev dua. Tab sis vim nws tus nqi qis, txoj kev loj hlob muaj peev xwm pom tseeb heev.

2. Lub copolymer bonded los ntawm – si-c-bond muaj ib tug kuj ruaj khov qauv thiab yuav khaws cia rau ntau tshaj ob xyoos nyob rau hauv kaw tej yam kev mob. Txawm li cas los xij, vim yog siv cov platinum kim kim li catalyst hauv cov txheej txheem tsim khoom, cov nqi tsim khoom ntawm cov tshuaj tiv thaiv no yog siab, yog li nws tsis tau siv dav.

V. Organic Silicon Antifoamer

… tshooj tom ntej.