txoj moo

1. Txoj kev nqus tau:
Nqus hydrogen sulfide roj nrog alkali sulfide tov (lossis caustic cov tshuaj noj ntawm cov dej qab zib). Vim tias hydrogen sulfide roj yog tshuaj lom, kev nqus cov tshuaj tiv thaiv yuav tsum tau ua kom nyob hauv qab siab. Txhawm rau tiv thaiv cov pa phem ntawm cov huab cua los ntawm hydrogen sulfide hauv cov roj tawm, thiab cov ntsiab lus hydrogen ua haujlwm tau txo qis dua tom qab rov nqus dua. Cov kua nqus tau yog feeb kom tau txais sodium hydrosulfide. Nws cov mis mis:
H2S + Naoh → Nahs + H2O
H2S + NA2S → 2NaHS

2. Sodium alkoxide reacts nrog dej qhuav sulfide los npaj sodium hydrosulfide:
Nyob rau hauv ib tug 150ml flask nrog ib ceg yeeb nkab, ntxiv 20ml ntawm freshly distilled absetrium thiab 2g ntawm cov roj av du thiab 2g ntawm cov dej khov kho rau ntawm lub raj nplaim dej thiab lub tshuab ziab khaub ncaws ua ke, thiab muab cov npliag ceg ua ntej. Thaum sodium alkoxide yog precipitated, ntxiv txog 40 ml ntawm abus ethanol hauv batches kom txog thaum sodium alkoxide yog yaj tag nrho.
Ntxig lub khob raj xa ncaj qha mus rau hauv qab ntawm kev daws los ntawm ceg yeeb nkab (nco ntsoov tias tsis muaj huab cua tuaj yeem nkag mus rau hauv lub raj hluav taws xob hauv qab cov yeeb nkab). Saturate qhov kev daws teeb meem. Qhov kev daws tau nqus lim kom muab tshem tawm cov daus. Qhov filtrate tau muab cia rau hauv lub conical flask qhuav, thiab 50 ml ntawm aughute ether tau ntxiv, thiab ntau npaum li cas ntawm Nahs daus dawb nag lossis precipitated tam sim ntawd. Tag nrho ntawm txog 110 ml ntawm ether yuav tsum muaj. Cov nag lossis nag lossis daus tau siv ntau nrawm, ntxuav 2-3 zaug uas muaj ethered, thiab muab tso rau hauv lub tshuab nqus dej desiccator. Lub purity ntawm cov khoom tuaj yeem ncav tes ntsuas kev phatytical. Yog tias xav tau cov kev ua kom muaj nuj nqis ntau dua, nws tuaj yeem yaj nyob hauv ethanol thiab recrystallized nrog ether.

3.sodium hydrosulfide kua:
Dhuav Sodium Sulfide tsis muaj dab tsi nyob rau hauv freshly steashly stuffing dej, thiab tom qab ntawd dilute rau 13% na2s (w / v) tov. 14 g ntawm sodium bicarbonate tau ntxiv rau cov tshuaj saum toj no (100 ml) nrog nplawm thiab qis dua 20 ° C, tshem tawm tam sim ntawd thiab exothermic tam sim ntawd. Tom qab ntawd 100 ml ntawm methanol tau ntxiv nrog nplawm thiab qis dua 20 ° C. Txij ntawm no lub sijhawm no tau rov ua dua thiab yuav luag txhua tus ntawm lub suab nkauj crystalline sodium techipitated tawm tam sim ntawd. Tom qab 0 feeb, cov dej sib tov tau lim nrog nqus thiab cov seem tau ntxuav nrog methanol (50 ml) nyob rau hauv feem. Cov filltrate muaj tsawg dua 9 g ntawm sodium hydrosulfide thiab tsis ntau tshaj 0.6 feem pua ​​ntawm cov sodium carbonate. Qhov ntau ntawm ob yog hais txog 3.5 grams thiab 0.2 grams ib 100 ml ntawm kev daws, feem.

Peb feem ntau npaj nws los ntawm kev nqus hydrogen sulfide nrog sodium hydium daws. Thaum cov ntsiab lus (pawg feem ntawm sodium hydrosulfide) yog 70%, nws yog ib lub dihydrate thiab yog nyob rau hauv daim ntawv ntawm flakes; Yog tias cov ntsiab lus qis dua, nws yog cov khoom ua kua, nws yog peb cov hydrate.