Cau 4: tac dung

Trong cong ngiep nguoi ta san xuat H2SO4 bang phuong phap tiep xuc theo so do:

Dot nguyen lieu ->  trao doi nhiet lam nguoi khi -> loc bui xiclon -> loc bui dien -> thap rua 1 -> thap rua 2 -> loc dien uot 1 -> tang am -> loc dien uot 2 -> say -> tach dau mo

 -> oxihoa hon hop khi tao SO3 -> trao doi nhiet lam nguoi SO3 -> hap thu SO3 san xuat  H2SO4

Tac dung cua tung thiet bi:

lo dot: dot nguyen lieu pirit, luu huynh ban dau sinh khi SO2

noi hoi tao doi nhiet, co 2 tac dung: + lam nguoi hon hop khi

+ lang 1 luong bui trong hh khi (15-20%)

xiclon loc bui, loc bui bang phuong phap li tam, lam sach khoang 90% bui trong khi

loc dien: loc bang cac tam luoi tinh dien, hieu suat lam sach cao ( len toi 99.9%)

thap rua 1: thuc hien nhungnhiem vu:

+ ha nhiet do cua hon hop khi, tu 350-400oC xuong con 80-90oC

+ tach cac tap chat nhu As2O3, SeO2 … ra khoi hon hop khi

+ tach mu acid hinh thanh tu giai doan truoc ra khoi khi

+ tach 1 luong bui ra khoi hon hop khi

thap rua 2: thuc hien nhiem vu:

+ tiep tuc ha nhiet do cua hon hop khi ( tu 80-90 xuong con 30-40)

+ tach mu acid

+ laoi tap chat ra khoi hon hop khi

loc dien uot. Tach triet de luong bui ra khoi hon hop khi, dong thoi loai 1 phan mu acid

tang am, cung cap 1 luong am vao hon hop khi nham thuc day qua trinh ngung tu cua mu acid

loc dien uot 2 . tach triet de mu acid ra khoi khi

thap say : tach hoi nuoc ra khoi hon hop khi truoc khi vao giai doan oxh

tach dau mo: loai bo tap chat va dau mo trong thiet bi bi cuon theo hon hop khi

thap oxihoa: oxihoa SO2 thanh SO3

trao doi nhiet SO3  voi dong khi nguyen lieu di vao thap tiep xuc nham ha nhiet do cua SO3­, dong thoi gia nhiet hon hop khi nguyen lieu toi nhiet do phan ung truoc khi vao thap tiep xuc

hap thu SO3 tao acid hoac oleum