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 a zuba 30ml na crucible a cikin tanderu mai zafi mai zafi sannan a ƙone shi a (500 ~ 600) ° C na minti 30, rufe ƙofar tanderun don rage zafin jiki a cikin tanderun zuwa kasa da 200 ° C, sannan a ɗauka. fitar da crucible kuma matsar da shi zuwa na'urar bushewa don kwantar da (20 ~ 30) min, yin awo.

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 cikakken carbonization. Daga nan sai a matsa zuwa tanderun da ke da zafi mai zafi, a ƙone a (500 ~ 600) ℃ na tsawon awa 1, kashe wutar lantarki mai zafi mai zafi, lokacin da zafin wutar tanderu ya faɗi ƙasa da 200 ℃, cire shi kuma saka shi a cikin desiccator. don kwantar da (20 ~ 30) min, sannan a auna kan ma'aunin nazari.

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.