Kapangidwe ka cellulose ethers kumaphatikizapo masitepe angapo ochotsa cellulose kuzinthu zopangira ndikusintha kukhala ma cellulose ethers.Ma cellulose ethers ndi zinthu zosiyanasiyana zomwe zimagwiritsidwa ntchito m'mafakitale osiyanasiyana, kuphatikiza mankhwala, chakudya, nsalu ndi zomangamanga.Njira yopukutira ndiyofunikira kuti mupeze cellulose wapamwamba kwambiri, zopangira zopangira ma cellulose ethers.Zotsatirazi ndi kufotokozera mwatsatanetsatane kwa cellulose ether pulping process:
1. Kusankha zinthu zopangira:
Njira ya pulping imayamba ndikusankha zida zokhala ndi cellulose.Magwero ambiri ndi nkhuni, thonje, ndi ulusi wina wa zomera.Kusankhidwa kwa zipangizo kumadalira zinthu monga kupezeka kwa cellulose ether, mtengo ndi katundu wofunidwa.
2. Njira yopangira zamkati:
Pali njira zambiri zama cellulose pulping, makamaka kuphatikiza mankhwala pulping ndi makina pulping.
3. Chemical pulping:
Kraft pulping: Kuphatikizira kuchiza tchipisi tamatabwa ndi osakaniza a sodium hydroxide ndi sodium sulfide.Izi zimasungunula lignin, ndikusiya ulusi wa cellulosic.
Sulfite pulping: Kugwiritsa ntchito sulfurous acid kapena bisulfite kuphwanya lignin muzakudya.
Organic solvent pulping: Kugwiritsa ntchito zosungunulira za organic monga ethanol kapena methanol kusungunula lignin ndikulekanitsa ulusi wa cellulose.
4. Kupupa kwamakina:
Kupukuta matabwa: Kumaphatikizapo kugaya nkhuni pakati pa miyala kuti mulekanitse ulusi.
Refiner Mechanical Pulping: Amagwiritsa ntchito mphamvu zamakina kulekanitsa ulusi poyenga tchipisi tamatabwa.
5. Bletching:
Pambuyo pa pulping, cellulose imalowa m'thupi kuti achotse zonyansa ndi mtundu.Chlorine, chlorine dioxide, hydrogen peroxide kapena oxygen angagwiritsidwe ntchito panthawi yoyeretsa.
5.. Kusintha kwa cellulose:
Pambuyo pa kuyeretsedwa, cellulose imasinthidwa kuti ipange ma cellulose ethers.Njira zodziwika bwino zimaphatikizapo etherification, esterification ndi machitidwe ena amankhwala kuti asinthe mawonekedwe amthupi ndi mankhwala a cellulose.
6. Njira ya Etherification:
Alkalization: Kuchiza cellulose ndi alkali (nthawi zambiri sodium hydroxide) kuti apange alkali cellulose.
Kuwonjeza ma etherifying agents: Alkaline cellulose imakhudzidwa ndi etherifying agents (monga alkyl halides kapena alkylene oxides) kuyambitsa magulu a ether mu kapangidwe ka cellulose.
Neutralization: Neutralize zimene osakaniza kuthetsa anachita ndi kupeza kufunika mapadi ether mankhwala.
7. Kuchapa ndi kuyanika:
Ma cellulose ether amatsukidwa kuti achotse zotsalira ndi zonyansa.Pambuyo poyeretsa, zinthuzo zimauma kuti zikwaniritse chinyezi chomwe mukufuna.
8. Kupera ndi kuyesa:
Ma ethers owuma a cellulose amatha kukhala pansi kuti apeze kukula kwake kwa tinthu.Sieving imagwiritsidwa ntchito kupatutsa tinthu tating'ono tofunikira.
8. Kuwongolera khalidwe:
Njira zowongolera zabwino zimakhazikitsidwa kuti zitsimikizire kuti ma cellulose ethers akwaniritsa miyezo yodziwika.Izi zikuphatikizapo kuyezetsa mamasukidwe akayendedwe, kuchuluka kwa m'malo, chinyezi ndi zina zofunika.
9. Kuyika ndi kutumiza:
Chogulitsa chomaliza cha cellulose ether chimapakidwa ndikugawidwa ku mafakitale osiyanasiyana.Kuyika koyenera kumatsimikizira kuti khalidwe la mankhwala limasungidwa panthawi yosungiramo ndi kuyendetsa.
The pulping process of cellulose ether ndi zovuta zingapo zomwe zimakhudza kusankha kwazinthu zopangira, pulping njira, bleaching, cellulose kusinthidwa, etherification, kutsuka, kuyanika, kugaya ndi kuwongolera khalidwe.Gawo lirilonse ndi lofunika kwambiri pozindikira ubwino ndi katundu wa cellulose ether yomwe imapangidwa, ndikupangitsa kuti ikhale yoyenera pa ntchito zosiyanasiyana.Kupita patsogolo kwaukadaulo kukupitilizabe kukonza ndikuwongolera njirazi kuti ziwonjezeke bwino komanso kukhazikika kwa kupanga cellulose ether.
Nthawi yotumiza: Jan-15-2024