Tong Hop Xuc Tac Tren Chat Mang

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  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Bi thuyt trnh

    Sn xut xc tc trn cht mang

    Thc hin :

    Nguyn Minh Kha MSSV: 60501215Phng Quc Tm MSSV: 60502475

    Lp HC05KSTN

    Hng dn: C Trn Mai Phng

  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Sn xutxc tc trncht mang

    Phngphp chung

    Mt s chtmang quan

    trng

    SilicagelOxit

    nhmZeolite

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Cho cau t hoat ong gan vao chat mang.

    Chat mang la vat lieu tr, co nhieu lo xop va t hoat ong hoa

    hoc.

    Tuy thuoc vao loai thiet b phan ng, chat xuc tac tren chat mang

    co the co nhng hnh dang nh: cau, tru, vay

    I AC TRNG CHUNG CUA PHNG PHAP

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    ac trng chung cua phng phap

    Thng ngi ta tam cau t xuc tac len chat mang bang dung dch

    cha cau t o.

    Xuc tac kim loai thng thu dang hydroxyt tren chat mang, sau o

    chuyen sang dang oxyt va kh en kim loai.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    CAC BC THC HIEN VIEC TAM HAT CHAT

    MANG

    Hut chan khong kh t lo xop cua chat mang.

    X ly chat mang bang dung dch.

    Tach dung dch tha.

    Say va nung.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Hut chan khong chat mang

    Tang s ong nhat cua hat trong qua trnh tam

    Tang nhanh qua trnh tam

    V:

    Thng trc khi tam trong cac mao quan b bao hoa mot lng kh de

    tan vao dung dch tam

    Km ham s tham qua cua dung dch tam

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Hut chan khong chat mang

    Ky thuat chan khong co nhieu phc tap nen thng giai oan nay

    c bo qua.

    Mat khac, ap suat mao quan khi tam co the at en hang tram

    atm, no de dang thay the khong kh trong mao quan.

    Qua trnh thay the nay cang nhanh neu co gia nhiet.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Tam lien tuc cho san pham ong nhat hn ve thanh phan hoat tnh xuc

    tac.

    Sau moi lan tam can chuyen qua giai oan gia cong nhiet.

    So lan tam phu thuoc nhieu vao cau truc lo xop cua chat mang echuyen van en tan ben trong mao quan.

    ac biet mao quan nho, tam nhieu co the lam bt hoan toan cac mao

    quan, lam mat tac dung xuc tac.

    Theo chu k

    Lin tc

    Tm xctc

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Tam xuc tac

    a so cac trng hp, thi gian tam co the xac nh theo pt Enstein:

    r: quang ng i trung bnh cua cau t khuech tan (xem la ban ban knh

    hat).

    De: he so khuech tan.

    = r2/(2De)

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    II/ MOT SO CHAT MANG QUAN TRONG

    Silicagel

    Oxit nhom

    Zeolite

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    La chat trong suot hay hat m, co nhieu lo xop.

    S

    i

    li

    c

    a

    g

    el

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Cau truc xop phu thuoc vao loai silicagel, co the dao ong khoang

    20-60%.

    Be mat rieng 200-800 m2/g.

    ng knh lo xop khoang 3-10 nm.

    ong vai tro nh la chat mang cua chat xuc tac hoat ong.

    S

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    el

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Trong cong nghiep, cho hydroxit silicagel p vi H2SO4.

    Quy trnh

    Hydroxyt vo nh hnh cua silic (SiO2.n H2O)

    S bien oi cua gel theo c che a ngng tu, tao cac phan t vi

    kch thc keo dang cau.

    nSi(OH)4SinO2n-m + (2n-m)H2O

    keo gel ra sy

    San xuat

    S

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    li

    c

    a

    g

    el

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Ngoai ra, san xuat silicagel trong cong nghiep theo p:

    Na2O.3SiO2+ H2SO43SiO2+ H2O + Na2SO4

    Keo tao ra c ong ran, ra lam kho va nung.

    Loai gel nh vay co cau truc xop ong nhat.

    San xuat

    S

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    el

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    He thong san xuat

    S

    i

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    c

    a

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    el

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    O

    xi

    t

    n

    h

    m

    Ran chac

    o xop kem (5-

    25%)

    Be mat rieng

    nho (1m2/g).

    Kem ben hn

    Cau truc xop

    (50-70%)

    Be mat rieng

    ln (120-150m2/g)

    -Al2O3 - Al2O3

    - Al2O3khong nhng la chat mang ma con la chat xuc tac cuanhieu phan ng.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    ac iem cua - Al2O3

    Thanh phan (% khoi lng) : Na2O t 0,1-0,6%; SiO20,1-1,0%; Fe2O3

    0,1-1,0%

    ng knh cua hat khoang 3-4 nm.

    Khoi lng rieng chat ong 0,6-0,9 g/m3.

    o xop tong 0,4-0,7 cm3/g.

    ng knh mao quan 3-4 nm.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Ky thuat san xuat - Al2O3

    Hau het eu da tren c s thu Al(OH)3bang cach tai ket tua at

    set dang hydrat.

    Ban chat qua trnh the hien theo phan ng sau:

    2 Al(OH)3+ 3 H2SO4Al2(SO4)3+ 6 H2O

    Al2(SO4)3+ 6 NaOH 2Al(OH)3+ 3Na2SO4

    Sau o, ngi ta nung Al(OH)3thu c - Al2O3

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  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Chuyen hoa - Al2O3 -Al2O3

    Thc hien nhiet o cao hn 11000C:

    - Al2O3Al2O3 -Al2O3

    Ta phai chuyen nh vay v trong mot so trng hp phai s dung xuc tac

    trang thai tang soi, ao tron manh b mai mon nhanh va co theloi cuon ra khoi vung phan ng.

    Can loai chat mang ac biet ran chac.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    SAN XUAT KHOI TIEP XUC

    1/ Xuc tac GIAP-3

    Thanh phan(%khoi lng): -Al2O3(93%), - Al2O3(1,8%), NiO

    (5,1%)

    The tch xop: ~35%

    Be mat rieng: ~5 m2/g

    Mat o chat ong: ~1,0 g/cm3

    O

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    2/ Khoi tiep xuc tang soi (FB)

    Dung e oxy hoa SO2trong lp tang soi.

    Chat xuc tac phai ac biet ran chac, v khi ao tron manh,

    no thng b mai mon nhanh va loi cuon ra khoi vung phan

    ng

    V du: S ton that Vanadi khi lam viec che o tang soi trong 1thang >8-10% so vi trong lng ban au.

    o ben c tang len ang ke khi s dung chat mang

    aluminosilicat.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Khoi tiep xuc tang soi (FB)

    La dang hat hnh cau mau vang sam.

    Thanh phan (% khoi lng): V2O5>= 7 ; K2O >=7 ; Al2O3~ 4-6 ; SiO2~

    82-80

    The tch xop ~ 50%Be mat rieng ~ 20 m2/g

    o mai mon trong 1 thang

  • 8/13/2019 Tong Hop Xuc Tac Tren Chat Mang

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    Qua trnh thu chat xuc tac FB

    1- Chuan b dung dch aluminosufat.

    2- Thu chat mang hnh cau.

    3- Lam kho, nung chat mang hnh cau.

    4- Tam chat mang.5- Lam kho va xuc tac.

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    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

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    Cng thc chung c dng sau:M2/nO.Al2O3.xSiO2.yH2O

    trong n: ha tr ca ion kim loi Mx: t s mol SiO2/Al2O3y:s mol nc

    x : xc nh tnh cht v cu trc ca zeolite

    Zeolite l cc Aluminosilicate c cu trc tinh th h theokhng gian 3 chiu

    Sn xut xc tctrn cht mang

    ZeoliteSilicagelOxit

    nhm

    1. Cu trc zeolit :

    Z

    e

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    l

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    e