xov xwm

1. Txoj kev nqus dej:
Absorb hydrogen sulfide gas nrog alkali sulfide tov (los yog caustic soda tov). Vim tias cov roj hydrogen sulfide yog tshuaj lom, cov tshuaj tiv thaiv kev nqus yuav tsum tau nqa tawm hauv qhov tsis zoo. Txhawm rau tiv thaiv cov pa phem ntawm huab cua los ntawm hydrogen sulfide nyob rau hauv cov pa pa, ob peb absorbers tau ua nyob rau hauv series nyob rau hauv ntau lawm, thiab cov hydrogen sulfide cov ntsiab lus yog txo mus rau ib tug qis theem tom qab rov qab nqus. Cov kua nqus dej yog concentrated kom tau txais sodium hydrosulfide. Nws chemical formula:
H2S + NaOH → NaHS + H2O
H2S+Na2S → 2NaHS

2. Sodium alkoxide reacts nrog qhuav hydrogen sulfide los npaj sodium hydrosulfide:
Nyob rau hauv ib lub khob 150mL nrog ib tug ceg yeeb nkab, ntxiv 20mL ntawm freshly distilled kiag li ethanol thiab 2g ntawm hlau sodium pieces nrog ib tug du nto thiab tsis muaj oxide txheej, nruab ib tug reflux condenser thiab ib tug kom qhuav yeeb nkab rau ntawm lub hwj, thiab muab cov ceg yeeb nkab ua ntej. Thaum cov sodium alkoxide yog precipitated, ntxiv txog 40 ml ntawm ethanol kiag li nyob rau hauv batch kom txog thaum lub sodium alkoxide yog tag yaj.
Ntxig ib lub iav raj ncaj nraim rau hauv qab ntawm cov tshuaj los ntawm cov ceg yeeb nkab, thiab hla cov roj hydrogen sulfide qhuav (nco ntsoov tias tsis muaj cua tuaj yeem nkag mus rau hauv lub raj mis hauv cov kav dej kaw). Saturate cov tshuaj. Cov tshuaj yog suction lim kom tshem tawm cov precipitate. Cov lim dej tau muab tso rau hauv lub khob ntim dej qhuav, thiab 50 mL ntawm cov ether kiag li tau ntxiv, thiab ntau cov NaHS dawb precipitate tau los nag tam sim ntawd. Yuav tsum muaj txog 110 mL ntawm ether. Lub precipitate tau lim sai sai, ntxuav 2-3 zaug nrog cov ether kiag li, blotted qhuav, thiab muab tso rau hauv lub tshuab nqus tsev desiccator. Lub purity ntawm cov khoom yuav ncav cuag analytical purity. Yog xav tau purity siab dua NaHS, nws tuaj yeem yaj hauv ethanol thiab recrystallized nrog ether.

3. Sodium hydrosulfide kua:
Dissolve sodium sulfide nonahydrate nyob rau hauv freshly steamed stuffing dej, thiab ces dilute mus 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, dissolving tam sim ntawd thiab exothermic. Tom qab ntawd 100 ml ntawm methanol tau ntxiv nrog nplawm thiab qis dua 20 ° C. Thaum lub sij hawm no lub exotherm tau rov exothermic thiab yuav luag tag nrho cov crystalline sodium carbonate precipitated tam sim ntawd. Tom qab 0 feeb, qhov sib tov tau lim nrog nqus thiab cov seem raug ntxuav nrog methanol (50 mL) hauv feem. Cov lim dej tsis muaj tsawg dua 9 g ntawm sodium hydrosulfide thiab tsis pub ntau tshaj 0.6 feem pua ​​​​ntawm sodium carbonate. Qhov concentration ntawm ob yog li ntawm 3.5 grams thiab 0.2 grams ib 100 ml ntawm kev daws, feem.

Peb feem ntau npaj nws los ntawm absorbing hydrogen sulfide nrog sodium hydroxide tov. Thaum cov ntsiab lus (feem ntau ntawm sodium hydrosulfide) yog 70%, nws yog 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 Hydrate.