ʻO nā ethers cellulose a me ke ʻano hana no ka hana ʻana

ʻO ka hana ʻana onā ethers cellulosepili i kahi moʻo o nā hoʻololi kemika i ka cellulose, e hopena ana i nā derivatives me nā waiwai kū hoʻokahi. Eia kahi ʻike laulā o nā ʻano hana i hoʻohana ʻia no ka hana ʻana i nā ethers cellulose:

1. Koho ʻana o ke kumu o ka Cellulose:

• Hiki ke loaʻa nā cellulose ethers mai nā kumu like ʻole e like me ka pulp lāʻau, nā linters pulupulu, a i ʻole nā ​​​​mea kanu ʻē aʻe. Hiki i ke koho ʻana o ke kumu cellulose ke hoʻopili i nā ʻano o ka huahana cellulose ether hope loa.

2. Ka hoʻopili ʻana i ka pulp:

• Hoʻopili ʻia ke kumu cellulose e wāwahi i nā olonā i kahi ʻano maʻalahi. Hiki ke hoʻokō ʻia ka pulping ma o ka mechanical, kemika, a i ʻole ka hui pū ʻana o nā ʻano ʻelua.

3. Hoʻomaʻemaʻe:

• Hoʻokomo ʻia ka cellulose i pulped ʻia i nā kaʻina hana hoʻomaʻemaʻe e wehe i nā mea haumia, lignin, a me nā ʻāpana ʻē aʻe ʻaʻole cellulosic. He mea nui ka hoʻomaʻemaʻe no ka loaʻa ʻana o kahi mea cellulose kiʻekiʻe.

4. Hoʻāla ʻia o Cellulose:

• Hoʻāla ʻia ka cellulose i hoʻomaʻemaʻe ʻia ma ka pehu ʻana i loko o kahi hopena alkaline. He mea koʻikoʻi kēia kaʻina hana no ka hoʻonui ʻana i ka pane ʻana o ka cellulose i ka wā o ka hopena etherification ma hope.

5. Hana Etherification:

• Hoʻopili ʻia ka cellulose i hoʻāla ʻia i ka etherification, kahi e hoʻokomo ʻia ai nā hui ether i nā hui hydroxyl ma ke kaulahao polymer cellulose. ʻO nā mea etherifying maʻamau e komo pū me ka ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, a me nā mea ʻē aʻe.
• Hana ʻia ka hopena ma lalo o nā kūlana i kāohi ʻia o ka mahana, ke kaomi, a me ka pH e hoʻokō ai i ke kekelē o ka pani ʻana (DS) i makemake ʻia a e pale aku i nā hopena ʻaoʻao.

6. Hoʻopau a me ka holoi ʻana:

• Ma hope o ka hopena etherification, hoʻopau pinepine ʻia ka huahana e wehe i nā reagents keu a i ʻole nā ​​​​​​huahana ʻaoʻao. Hana ʻia nā ʻanuʻu holoi ma hope e hoʻopau i nā kemika a me nā haumia i koe.

7. Hoʻomaloʻo:

• Hoʻomaloʻo ʻia ka cellulose i hoʻomaʻemaʻe ʻia a me ka etherified e loaʻa ai ka huahana cellulose ether hope loa i ke ʻano pauka a granular paha.

8. Ka Mana Kūlana:

• Hoʻohana ʻia nā ʻano hana loiloi like ʻole, me ka spectroscopy magnetic resonance nuclear (NMR), ka spectroscopy Fourier-transform infrared (FTIR), a me ka chromatography, no ka kaohi ʻana i ka maikaʻi. Nānā pono ʻia ka DS e hōʻoia i ke kūlike.

9. Hoʻokumu a me ka Hoʻopili ʻana:

• A laila hoʻohui ʻia ka cellulose ether i nā papa like ʻole e hoʻokō ai i nā koi kikoʻī o nā noi like ʻole. He kūpono nā cellulose ethers like ʻole no nā ʻoihana like ʻole, e like me ke kūkulu ʻana, nā lāʻau lapaʻau, ka meaʻai, nā uhi ʻana, a me nā mea hou aku.

He mea nui e hoʻomaopopo he ʻokoʻa paha nā ʻano hana a me nā kūlana kikoʻī ma muli o ka huahana cellulose ether i makemake ʻia a me ka hoʻohana i manaʻo ʻia. Hoʻohana pinepine nā mea hana i nā kaʻina hana ponoʻī e hana i nā cellulose ethers me nā waiwai kikoʻī i hana ʻia e hoʻokō i nā pono o nā ʻoihana like ʻole.