Yadda za a gano abun cikin ash na hydroxypropyl methylcellulose?

Abubuwan da ke cikin ash alama ce mai mahimmancihydroxypropyl methylcellulose. Yawancin abokan ciniki sukan tambayi lokacin da suka fahimci hydroxypropyl methylcellulose: menene darajar ash? Hydroxypropyl methylcellulose tare da ƙaramin ash abun ciki yana nufin mafi girman tsarki; cellulose tare da babban abun ciki na ash yana nufin cewa akwai ƙazanta da yawa a ciki, wanda zai shafi tasirin amfani ko ƙara yawan adadin. Lokacin da abokan ciniki suka zaɓi hydroxypropyl methylcellulose, sau da yawa kai tsaye suna kunna wasu cellulose da wuta kuma su ƙone shi don gwada abun cikin toka na cellulose. Amma wannan hanyar ganowa ba ta da ilimin kimiyya sosai, saboda yawancin masana'antun suna ƙara haɓakar konewa ga cellulose. A saman, cellulose yana da ƙananan toka bayan konewa, amma a aikace, riƙewar ruwa na hydroxypropyl methylcellulose ba shi da kyau sosai.

Don haka ta yaya za mu gano daidai abun cikin ash na hydroxypropyl methylcellulose? Hanyar gano madaidaicin shine a yi amfani da tanderun murfi don ganowa.

Instrument Analytical balance, high zafin jiki muffle makera, lantarki tanderu.

Hanyar gwaji:

1) Da farko sai azuba crucible 30ml a cikin tanderu mai zafi mai zafi sannan a ƙone shi a (500 ~ 600) ° C na tsawon mintuna 30, rufe ƙofar tanderun don rage zafin wuta a cikin tanderun zuwa ƙasa 200 ° C, sannan a fitar da crucible a matsar da shi zuwa wani desiccator don kwantar da hankali 30 ~ min.

2) Nauyin 1.0 g nahydroxypropyl methylcelluloseA kan ma'auni na nazari, sanya samfurin da aka auna a cikin crucible, sa'an nan kuma sanya crucible dauke da samfurin a kan wutar lantarki don carbonization, sanyi zuwa dakin zafin jiki, ƙara sulfuric acid (0.5-1.0) ml, sa'an nan kuma sanya shi a kan wutar lantarki don kammala carbonization. Sa'an nan matsa zuwa high zafin jiki muffle tanderu, ƙone a (500 ~ 600) ℃ na 1 hour, kashe ikon high zafin jiki muffle makera, lokacin da tanderun zafin jiki saukad da kasa 200 ℃, fitar da shi da sanya shi a cikin desiccator don kwantar (20 ~ 30) min, sa'an nan auna a kan wani nazari ma'auni.

Ana ƙididdige ragowar wutar lantarki bisa ga dabara (3):

m2-m1

Ragowar wuta (%) = ×100………………………………(3)

m

A cikin ma'auni: m1 - yawan adadin crucible maras kyau, a cikin g;

m2 - taro na saura da crucible, a g;

m - yawan samfurin, a cikin g.