chitin-bùi Đức tài
TRANSCRIPT
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B GIO DC V O TOTRNG I HC NHA TRANG
KHOA C KH------------------
BI C TI
THIT K K THUT THIT B
SN XUT CHITIN NNG SUT 0,5 TN/M
N TT NGHIP I HC
CHUYN NGNH: CH TO MY
Nha Trang, thng 11 nm 2008
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Nguyn li u
Ngm trong Na
R a trung tnh
Ngm trong HCl
R a trung tnh
Ngm trong HCl
R a trung tnh
T y mu b ng NaOCl ho c H2O2
R a trung tnh
Chitin
N u trong NaOH
R a trung tnh
S y kh
NaOH(35-50%)t0= (80-140
0C)
(0,5-10h)
t0
phng
24h
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- Nh n xt:
- y l quy trnh t ng h p t cc quy trnh s n xu t tr c . S n ph m
chitosan s n xu t theo quy trnh ny c mu tr ng p, cc ch t mu c lo i b
s ch trong qu trnh t y mu. Hm l ng protitd v khong ch t cn l i trong
chitin th p, chitosan thu c c tnh a d ng cao, tu theo t ng ng d ng m s
d ng cho ph h p.
- Qu trnh tch protitd c th c hi n b ng ngm trong Na 2CO3 ho c NaOH.
S d ng Na2CO3 cho ta ch x l nh h n nn d n t i chitosan c phn t
l ng l n h n.
- Ch c a qu trnh tch khong khc nhau, ch ra s lin quan gi a n ng
v nhi t c a qu trnh x l, ng th i n nh h ng m nh n chu i
chitin v chitosan thu c.
- Trong quy trnh s n xu t ny c dng ch t t y mu nn mu s c c a chitin
v chitosan thu c tr ng u p, tuy nhin ph i xt t i nh h ng c a qu
trnh t y mu n ch t l ng chitosan nh phn t l ng v nh t.
- Qu trnh kh acetyl c ti n hnh v i cc i u ki n x l khc nhau nn
cho ra cc s n ph m chitosan cu i cng v i tnh ch t r t a d ng, khc nhau v
kh axetyl, phn t l ng v nh t.
.- V tm hm c r a s ch v s y kh 100 C, c kh khong b ng cch
ngm trong HCl 2N v i t l w/v = 1/10 nhi t phng trong th i gian t=5h,
sau em r a trung tnh r i s y kh 1000C, v nghi n thnh b t mn r i ti p
t c ngm trong dung dch HCl 2N v i t l w/v = 1/2,5 c ng nhi t ph ng
trong th i gian 48h sau li tm thu ph n b v em r a trung tnh. Ngm b b t
r a trong dung dch NaOH 1N v i t l w/v 1/2,5 nhi t t=1000C trong
th i gian t=42h r i em ly tm thu ph n b v ti n hnh r a trung tnh. Sau l i
ti p t c ngm trong dung dch NaOH 1N v i t l v nhi t nh trn, trong th i
gian t=12h r i em ly tm thu b. Ti p theo r a trung tnh v em lm s ch b ng
cch ly tm v i cc ch t theo th t : n c, ethanol, ether v lm kh ta thu c
s n ph m chitin d ng b t kem.
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HCl 2M
t0
phng
5h
w/v=1/10
HCl 2M
t0
phng
48hw/v=1/2,5
aOH1M
t0=100
0C
42hw/v=1/2,5
V tm hm
Ngm HCl
R a trung tnh, s y kh
Nghi n mn
Ngm HCl
Ly tm
R a trung tnh
Ngm NaOH
Ly tm
R a trung tnh
Ngm NaOH
Ly tm
R a trung tnh
R a s ch b ng ly tm
Lm kh
Chitin d ng b t mu kem
aOH1M
t0=100
0C
42hw/v=1/2,5
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- Nguyn li u (v tm) s ch c em i h p chn, ph i kh, sau xay nh .
Ti n hnh kh protein b ng dung dch NaOH 3,5% v i t l w/v = 1/10 nhi t
t=65C trong th i gian t=2h r i v t ra r a trung tnh, sau ngm trong HCl
1N v i t l w/v = 1/10 nhi t phng trong th i gian t=2h r i v t ra ri ti n
hnh t y mu cc ch t mu h u c b ng aceton v i t l w/v = 1/5, nhi t
phng trong th i gian 30 pht, v t ra v r a s ch sau t y mu l i b ng NaOCl
0,135% v i t l w/v = 1/10 nhi t phng trong th i gian t= 6 pht r i v t ra
r a trung tnh ta thu c chitin. Sau ti n hnh deacetyl chitin b ng NaOH
40% t l w/v = nhi t t= 85C trong th i gian t=4h r i em r a trung tnh
thu c chitosan.
- u i m :
+ Th i gian s n xu t ng n, s n ph m c mu s c p, s ch do c 2 b c kh
s c t .
- Nh c i m :
+ Do NaOCl l m t ch t oxy ha m nh, nh h ng n m ch polymer, do
nh t c a s n ph m gi m r r t. M t khc aceton r t t ti n, t n th t nhi u,
gi thnh s n ph m cao. Ch a k n cc y u t an ton s n xu t, cng ngh ny
kh p d ng trong i u ki n s n xu t c a n c ta hi n nay.
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- Nguyn li u s d ng l v tm, v cua v ph li u c a cc nh my ch bi n
thu s n. Qu trnh deacetyl c th c hi n nhi u m c n ng NaOH, th i
gian v nhi t . N u dng n ng NaOH th p th ph i tng th i gian x l th
chitosan thnh ph m m i t dactyl cao, ngoi ra vai tr c a nhi t c ng
c th hi n r trong vi c tch nhm acetyl khi s n xu t chitosan.
- Nh n xt:
+ y l m t quy trnh c nghin c u y v nh h ng c a ch x
l deacetyl (n ng , nhi t , th i gian) n ch t l ng chitosan ( nh t,
deacetyl). Quy trnh ny c ngha cao v n p ng c yu c u th c t s
Nguyn li u
Ngm HCl
R a trung tnh
Ngm NaOH
R a trung tnh
Chitin
Deacetyl trong NaOH c
R a trung tnh
S y kh
HCl 10%t0
phng
12h
NaOH 8%
t0
phng
12h
NaOH (35-40%)
t0
= (80-1000C)
=(5-6,5h)
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d ng chitosan r t a d ng, tu v o m c ch ng d ng m c n c nh t v
deacetyl khc nhau.
- Nh n xt:
+ S n ph m c ch t l ng kh t t, Chitin c mu tr ng p. xong th i gian
ch bi n cn kh di, s d ng nhi u ch t oxy ho d l m nh h ng n nh t
c a s n ph m.
V tm kh
Ngm HCl
R a trung tnh
Ngm NaOH
R a trung tnh
T y mu
Ngm NaOH
S y kh
HCl 6N
t0
phng
= 48hw/v = 1/2,5
NaOH 8%
t0 = 1000C
= 2h
KmnO4 1%Na2S2O3 1,5%
H2SO4 10%
NaOH 40%
t0 = 800C
=24hw/v = 1/1
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- Nh n xt:
+ Th i gian s n xu t c rt ng n, s l protein v deacetyl nhi t cao
nn ch t l ng chitosan gi m i, hi u xu t thu h i cao.
+ Nh ng quy trnh s n xu t chitin-chitosan hi n nay n c ta u c s n
xu t th cng theo nh ng cng o n ri ng bi t. Do th i gian s n xu t di,
nng su t khng cao. V v y, v n t ra l ph i rt ng n th i gian s n xu t
b ng vi c nng cao nhi t , g p chung cc cng o n vo m t mynh ng
ch t l ng chitin-chitosan ph i t yu c u chung.
V tm
R a s ch, s y kh, xay nh
Ngm HCl
R a s ch, s y kh
Ngm NaOH
R a trung tnh
R a b ng n c c t
S y kh (1000C)
HCl 12%
t0
phng
= 6h
NaOH 15%
t0
= 1500C
1h
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- Thi t k thi t b s n xu t chitin - chitosan c n ph i a ra cc quy trnh h p
l. T cc quy trnh trn, em ch n quy trnh s n xu t chung sau lm c s cho
vi c thi t k thi t b.
- Chitin, chitosan v cc d n xu t c a n c ng d ng nhi u trong ph gia
th c ph m, trong tc nhn bao gi v ch bi n n c u ng.
- Chitin v chitosan c th cung c p ch t x trong kh u ph n n r t an ton.
Cc nghin c u g n y cho bi t: Cc loi ng v t s pht tri n bnh th ng khi
tiu th 10% chitin c trong kh u ph n th c n hng ngy.
- Chitosan dng lm ch t ph gia, lm kem bi m t ch ng kh da, thu c lm
m m da, lm tng kh nng ho h p sinh h c gi a kem thu c v da. Do b n ch t
HCl 12%
t0
phng
= 6h
NaOH 15%t0
= 950C
= 1h
Nguyn li u(v tm)
R a s ch, c t v p
Ngm HCl
R a s ch, s y kh
Ngm NaOH
R a trung tnh
R a b ng n c c t
S y kh (800C)
HCl 4%
t0
= (65-800C)
= 3hw/v = 1/3
NaOH 3,5%t0
= 850C
= 2hw/v = 1/10
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c a chitosan c nh d dng trn bi u b da b i nhm NH4+
lin k t v i nhm
axt trong c u t o l p t bo s ng ho c a da, sau khi c nh chitosan c n c
nhi u nhm NH4+
th a c g n v i nh ng ch t gi n c ho c nh ng ch t l c
tia c c tm, v v y chitosan l g ch n i gi a ho t ch t c a kem v da.
- Chitin v chitosan c hng lo t ng d ng trong v n chm sc s c kho
cho con ng i, nh thu c m lm lnh v t th ng, thu c ch a b ng da....
- Chitosan c tc d ng lm tng qu trnh ti t o m, tng li n vi t th ng,
khng gy c cho t bo, mng chitin c tc d ng trong vi c chuy n ho c a t
bo i u ki n ngho dinh d ng ko di, i u ny c l i cho vi c i u tr v t
th ng.
- Chitosan dng lm ch t ph da r t t t cho k ngh b o ch d c ph m (keo
k t dnh vin, t d c ch t t o mng, t o nang m m ). Chitosan l ch t mang
polymer sinh h c g n thu c b ng lin k t c h c hay ho h c nh m t o ra
thu c polymer c nhi u tc d ng m i.
- Chitosan c dng m t thnh ph n chnh trong thu c phng tr n m dng
lm thu c kch thch sinh tr ng cho la, cy cng nghi p, cy n qu v cc l ai
cy c nh.- Chitosan c tch d ng kh lu di trn l v cy, lm tng n y m m h t,
tng vi c t o di p l c t trong l, tng kh nng m r , thc y qu tr nh ra hoa
k t qu , lm tng nng su t cy tr ng.
- Chitosan c kh nng t o ph c v i kim lo i vo nhm amin, n c th gi
c nhi u kim lo i chuy n ti p v nh ng kim lo i ng sau kim lo i chuy n
ti p do t o thnh ph c ch t vng... nn c s d ng lm ch t keo t trong x l
n c th i cng nghi p.
- Chitosan l ch t ph gia r t t t trong x l b m t gi y, c bi t gi y cao c p
nh gi y nh. Do cng th c ho h c c a chitosan v cellulose g n gi ng nhau,
ch c n thay th nhm NH2 c a Chitosan b ng nhm OH c a cellulose l c
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th t v tm& cua c th tr thnh cy, gip cc nh cng nghi p gi y c thm
m t lo i nguyn li u m i s n xu t b t gi y.
- Chitin - chitosan l ngu n nguyn li u r t qu s n xu t cc s n ph m r t
a d ng ph c v s n xu t v i s ng x h i, v v y nghin c u thi t k thnh
cng c m thi t b k thu t s n xu t chng qui m cng nghi p l m t nhu c u
c p thi t trong qu trnh cng nghi p ha - hi n i ha n n kinh t n c ta ni
chung v cng nghi p ch bi n th y s n ni ring.
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- Nng su t cao. My c th tch nh g n (k ho ng 1m3) nh ng v i k t c u
my h p l nn kh i l ng nguyn li u u vo c a m i m l t ng i nhi u
(kho ng 50 100 Kg). Th i gian chi t xu t c a m i m th r t ng n kho ng
20 gi s n xu t ra Chitosan - ng n h n r t nhi u so v i ph ng php s n xu t
b ng ph ng php th cng.
- Chi ph s n xu t th p. i v i m i thi t b ch c n m t cng nhn m
nh n cng vi c gim xt qu tr nh chi t xu t Chitin- Chitosan. Th i gian chi t
xu t Chitin - Chitosan c a m i m ng n. Chi ph kh u hao my mc t, gi thnh
nng l ng (i n nng) ph c v cho vi c s n xu t Chitin - Chitosan t ng i r .
- Th i gian s n xu t ra Chitin - Chitosan ng n. Theo th c nghi m cho th y
th i gian s n xu t ra Chitin gi m i r t nhi u t 48h xu ng cn h n 3h. Cn
th i gian s n xu t ra Chitosan gi m i t 48 72 gi xu ng cn h n 16 gi 30
pht.
- Ti t ki m s c lao ng c a cng nhn l m vi c. T o mi tr ng lm vi c
an ton cho cng nhn. Do khng ph i ti p xc tr c ti p v i ha ch t cng
nghi p trong qu trnh chi t xu t Chitin - Chitosan.
Tuy nhin, h th ng ho t ng hi u qu h n ta c n kh c ph c nh ngi m sau:
- Yu c u k thu t c a thi t b l ph i s y kh s n ph m n m d i
10%. Nh ng th c t v i k t c u my hi n t i ch a th s y kh c s n ph m
theo ng yu c u ra.
- Do thi t b chi t xu t Chitin - Chitosan c d ng l ng ngang Rto quay.
Yu c u c a thi t b l cc lo i dung dch ha ch t trong lng Stato c a thi t b
khng c tun ra ngoi gy lng ph ha ch t v nguy hi m cho cng nhn v n
hnh my. Nh ng b ph n lm kn n c khng m nh n t t ch c nng c a m nh
c n ph i c h ng kh c ph c v hon thi n.
- K t c u my ch a v ng ch c gy rung ng khi ho t ng. Nh t l khi
lm vi c v i t c cao.
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- Cc cnh o h i ng n khng m nh n t t ch c nng khu y o c a
mnh. Cc cnh o khng vung gc v i ti t di n ngang c a Rto n n s n ph m
b dnh vo trong cc k gi a cnh o v Rto.
- D a trn cc u nh c i m c a cc thi t b tr n, em xin a ra ph ng n
thi t k nh sau :
+ Thi t b c thi t k s c nguyn ly ho t ng gi ng nh nguyn l
c a thi t b s n xu t t i tr ng i h c Nha Trang.
+ K t c u c a thi t b s c hon thi n h n.
+ Nng su t c a thi t b cao h n ph h p v i l ng ph li u c a cc nh
my ch bi n th y s n.
- Qua c s l thuy t v cc quy trnh c th c hi n s n xu t chitin -
chitosan hi n hnh, c th khi qut cc cng o n ph i x l trong qu trnh s n
xu t nh sau:
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- y c coi l b c ti n x l lo i b t p ch t, protein, v n c, ng
th i lm gi m kch th c nguyn li u. H n n a, b c p u t s lo i b t p ch t
v n c trong nguyn li u lm cho qu trnh x l ti p theo c hi u qu h n.
- Tuy nhin, vi c c t nguyn li u khng c qu nh v s gy kh khn cho
b c x l ti p theo nh : o, r a, ly tm. Qu trnh ny c th c hi n m t
thi t b ring tr c khi a tr c ti p vo thi t b thng quay th c hi n cc
cng o n r a, o, ly tm, s y.
Nguyn li u
p kh, c t
Ngm o trong HCl(n=25v/p)
Ly tm (25v/p)
R a trung tnh (n=25v/p)
Ngm o trong NaOH(n=25v/p)
Ly tm (n= 25v/p)
Ngm o trong H2O (n=25v/p)
Ly tm (n=25v/p)
S y kh
Sn ph m
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- y l giai o n lm s ch nguyn li u (v tm) tr c khi cho vo my, v
lc u nguyn li u (v tm) cn nhi u t p ch t. N u giai o n ny c lm t t
cng v i nguyn li u t i th ch t l ng chitin- chitosan s t t v ti t ki m chi
ph ha ch t cc cng o n sau.
Trong quy trnh s n xu t chitin- chitosan th ta c hai cng
o n r t quan tr ng, l ngm axt v ngm ki m. rt ng n th i gian trao
i ch t c a nguyn li u v i dung dch c n ph i o nguy n li u theo m t t c
no .
y l giai o n trung gian gi a cc cng o n trong quy
trnh s n xu t, cho cc cng o n ti p theo khng cn l n dung dch c a cng
o n tr c. Ly tm l tch hm l ng n c trong nguyn li u (v tm)
chu n b cho qu trnh s y ti p theo.
- y l cng o n cu i cng c a quy trnh s n xu t chitin- chitosan t
kh theo yu c u.
- Hi n nay, Vi t Nam vi c s n xu t chitin - chitosan ch y u th c hi n theo
cc cng o n ring bi t, m i cng o n m t thi t b khc nhau. N u s d ngph ng php ny th th i gian ph m t nhi u, c n m t s cng nhn i u
khi n vi c v n chuy n nguyn li u gi a cc cng o n.
- V v y, v n t ra l rt ng n th i gian ph v s n xu t theo m t quy
trnh khp kn, c n ph i thi t k ra m t thi t b th c hi n t t c cc cng o n c a
quy trnh s n xu t chitin chitosan nu trn.
- Trong qu trnh lm vi c thi t b ph i th c hi n m t s ch c nng khc nhau
trong nh ng i u ki n khc nhau. Do , y u c u k thu t chung c a chng l
ph i thch h p v i m i i u ki n nh t n h cho nng su t cao v an ton khi th c
hi n. Khi thi t k s thi t b c n ph i ch n cc y u c u chung c a thi t b
l:
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- Thi t b c n c kh nng th c hi n v i
cc kh nng i u chnh cc thng s k thu t c b n ph h p: Nhi t , th i
gian th c hi n cc cng an cng ngh , n ng cc ha ch t s d ng ( ki m
NaOH hay axit HCl...).
- Nng su t thi t b c n t 500kg nguyn li u /m ph h p v i ngu n ph
li u c a cc nh my ch bi n th y s n hi n nay v 15 nm sau.
- V t li u ch t o thi t b ph i chu c axt HCl 12% v ki m 50 % cc
nhi t < 800C ph h p v i cc qui trnh cng ngh hi n hnh .
- Thi t b ph i c h th ng a dung dch vo v dung dch ph i m b o
ng t l yu c u v an tan cho ng i s d ng.
- Khi th c hi n quy trnh s n xu t chitin- Chitosan c nh ng cng o n lm
vi c nhi t cao do thi t b ph i c h th ng m b o nhi t ng y ucu.
- Vi c cung c p nguyn li u v thu s n ph m, dung dch c n n gi n & ph
h p v i cc tiu chu n an tan lao ng hi n hnh .
- Trong qu trnh ngm o, Thi t b ph i quay m t t c ph h p cc
ph n ng tch & kh s x y ra nhanh nh t v t t nh t.
- Thi t b ph i th c hi n t t ch c nng s y kh t o ra s n ph m h an chnh
t cc yu c u ch t l ng qui nh.- Thi t b c k t c u v cng ngh ch t o ph h p v i kh nng gia cng
trong n c v s d ng t i a cc chi ti t & thi t b ti u chu n c bn trn th
tr ng trong n c.
- Thao tc cng ngh ngm - o - ly tm c a thi t b u ti n hnh theo
nguyn t c quay o, v v y c th thi t k s ng c a thi t b trn c s my
ly tm. Hi n nay c m t s k t c u my ly tm ly tm nh sau:
+ Ly tm treo c ch t o v i nhi u ki u c c u tho khc nhau, trong c
c tho b ng tay. Trong nhi u lo i my ly tm th ph bi n nh t l ly tm treo v
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treo trn c t. Nh ng my ly tm ny t nh y v i i v i s phn b khng ng
u c a v t li u trong roto my ly tm treo thu n ti n khi tho pha d i, my
ly tm treo trn c t s d ng khi tho pha trn c ng nh khi tho pha d i.
+ Nguyn l c u t o c a my ly tm treo l treo tr c trong g i t cao h n
i v i tm quay qun tnh c a h . Nh cch treo nh th m h c c tnh n
nh cao v t nh tm c. B tr g i v d n ng bn trn roto c ng lo i
tr khng cho ch t l ng gia cng r i vo cc b ph n v lm nh b ph n tho
s n ph m pha d i. trong nh ng my m i, k t c u c a my ly tm hon
chnh vi c tho b ng c kh, nng cao t c lm vi c c a roto, c i ti n k t c u
g i , phanh hm d n ch ng.+ C u t o: ng c c t trn x , thng qua h th ng tr c d n ng
xu ng roto. T c c a my ly tm c i u khi n b ng b tng t c.
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+ c s d ng nhi u nh t trong cng nghi p s n xu t ng l my ly tm
lin t c hnh cn.
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-
+ Trong nh ng my ly tm ny c hai thng ng tm quay khc nhau; th
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(2.1)
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(2.3)
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RB
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P2
P2
2865000
Mz (N.mm)
2675844,64
Mx (N.mm)
1812153,57
150200 2300 300
0
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RA RD
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1m
1,5 m
F21 F27F27
B
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Dung d
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Stato
Ong xa Ong lap CB Ong cap nhiet Ong cap dd Ong thoat kh
Khung may Tu ien
ong c
Bu long Truc rotoBo kn nc
Gau muc
Roto
Canh ao
Truc1
Tr ong ai
Banh ai Day ai
Thiet b
HT nc nong Bnh dd
O bi2
1
10 12
28
8,9 2
1 1 1 3
1 2
1
1
1
1
5
11 17
410
16 6 18 19
2223
1
7
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