n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 1 N MN HC Cng Ngh Ch Bin Kh 11: Tnh ton thp lm kh kh bng TEG Cu tC1 C2C3n-C4n-C5n-C6H2SN2 CO2 %V805.23.83.53.02.50.51.00.5 - Lng kh cn lm kh: 4 triu Nm3/ngy - Nhit kh vo:60oC - p sut kh vo:7,5 MPa - im sng yu cu:+10oC - p sut kh kh: 7,3 MPa - Lu lng ring TEG ngho: 30 kg TEG/1 kg H2O Tnh cc yu t: - Nng ti thiu ca TEG - Lng dung dch tun hon- S a l thuyt - S a thc t- Bn knh (ng knh) thp - Chiu cao thp n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 2 Bi lm Phn I: TIM NNG KH VIT NAM Vit Nam c th gii nhn nhn l mt quc gia du kh non tr trong cng ng cc quc gia du kh trn th gii. Theo PetroVietnam Gas Company, tim nng ngun kh Vit Nam tp trung 5 vng trng chnh: trng Sng Hng, trng Cu Long, trng Nam Cn Sn, trng M lai Th Chu v trng min Trung c kh nng cung cp kh trong vi thp k ti. Cc vng trng ny n nay vn ang giai on nghin cu v nh gi mt cch chi tit. Hin nay, ch c 2 trng c tr lng thng mi l trng Cu Long v trng NamCnSnthucthmlc aphanam ncta.Trong m duBch HvmRngthucvngtrng CuLongvangchosnlng khai thc kh ng hnh quan trng nht. Bng 1: Tim nng kh Vit Nam M khTr lng thc t (t m3) Tr lng tim nng (t m3) Sng Hng Cu Long Nam Cn Sn M Lai Th Chu Cc m nh khc 5,6 11,2 42 70 140 196 14 42 28 56 84 140 532 700 84 140 532 700 Tng cng201,6 319,21260 1736 Bng 2: Trin vng ca ngnh cng nghip kh Th trngNhu cu s dng kh (nm2010) Cng nghip Phn m Vn ti inLNG Xut khu sang Thi Lan 14% 6% 0% 30% 31% 19% n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 3 Phn II: GII THIU CHUNG V CNG NGH LM KH KH(DEHYDRATION) 1. Mc ch Qu Trnh Lm Kh Kh - Kh sau khi khai thc ngoi cc cu t chnh l cc Hydrocacbon Parafin cn cha cc tp cht nh: bi, hi nc, kh tr, CO2, H2S v cc hp cht hu c ca lu hunh. Mt s kh (CH4, C2H6, C3H8, i- C4H10, H2S, CO2 v N2) c kh nng to hydrat kh lm tc nghn ng ng, cn tr qu trnh vn hnh ca cc thit b trong qu trnh ch bin kh nh bm, qut,my nn, thc y n mn-Hydratlnhngtphpchtcthtntimtcch bnvngdidng tinhth.Thcchtchnglnhngdungdchrn,trongccphntnc dungminhcclinkthydrotothnhkhunghydrat.Trongcckhoang ca khung ny cc phn t kh c kh nng to hydrat s chim ch. + iu kin to thnh Hydrat ch khi hi cc yu t sau: - C nc dng t do v c s tip xc gia kh v nc - iu kin nhit nh hn nhit to Hydrat - Cccthnhphn ckhnngto hydrat(CH4,C2H6,C3H8,i-C4H10, H2S, CO2 v N2) - C s thay i p sut nh qua van gim p - C mi trng v thi gian + Cng thc ca cc hydrat kh: CH4.6H2O, C2H6.8H2O, C3H8.17H2O, i- C4H10. 17H2O, H2S. 6H2O, CO2. 6H2O, N2.6H2O. - Nc lm gim nhit tr ca kh, lm gim hot tnh xc tc, tng cng n mn thit b c bit khi c H2S, CO2. Kh cn phi c tch hi nc (dehydrat) trc khi a vo ch bin bng cch sy kh hoc trn thm vo kh tc nhn c ch qu trnh to hydrat. Qu trnh sy kh lm gim hm lng nc c trong kh sao cho p sut ring phn ca hi nc nh hn p sut hi bo ha ca hydrat, nhm cc mc ch sau: - Ngn nga s hnh thnh hydrat kh. - Ngn nga n mn (c bit khi c hi nc). - Tng gi tr nhit chy cho kh. - p ng yu cu k thut ca kh. n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 4 2. Cc Phng Php Lm Kh Kh Trong cng nghip, cc phng php sy kh kh sau y thng c s dng: 2.1 Lm kh bng phng php hp th dng dung mi ht m -Phngphphpthcsdngrngrisykhkhticccng trnh ng dn kh cng nh trong cc nh my ch bin kh.- S sy kh kh bng cc cht hp th ny da trn s khc bit v p sut ring ca hi nc trong kh v trong cht hp th. - Cht hp th sy kh l nhng dung dch nc m c ca mono-, di- v trietylenglycol. -Lng m c th tchra t kh bng cc cht hp th - sy kh c xc nh bng kh nng ht m ca cc cht hp th, nhit v p sut, s tip xc gia kh vi cht hp th, khi lng cht hp th tun hon trong h v nht ca n. 2.2 Lm kh bng phng php hp ph dng cht hp ph rn xp (vt liu mao qun) - Khi cn phi sy kh vi h im sng ti 100 200oC v yu cu kh sau khi sy c im sng rt thp -85 -100 oC, ta s dng phng php hp ph. - Hp ph l qu trnh tp trung cc cht trn b mt hoc trong khng gian ca cc vi l xp ca cht rn. - Qu trnh sy kh kh bng cc cht hp ph da vo kh nng ca cc vt thrnvicutrcxcnhhpphlngmtkhnhittngi thp v sau tch m khi tng nhit .- Trong cng nghip ch bin kh, ngi ta thng dng silicagel, oxit nhm hottnh,boxithottnh,zeolit3Av4A.Hinnay,vicsdngzeolitc nhiu trin vng v t im sng rt thp v c th lm vic nhit cao. 2.3 Phng php nn kh hoc lm lnh Phng php n gin nht lm gim lng m c trong kh l lm lnh kh m n nhit di nhit im sng ca hn hp kh. Hi nc s b ngng t v tch khi kh di dng nhng ht sng. Nhngtrong astrnghp,nuchlmlnhskhng vkh iu khin qu trnh. Hin nay cc phng php hp th v hp ph c s dng rt ph bin. n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 5 * So snh u nhc im ca phng php sy kh kh bng hp th v hp ph: Phng phpHp ThHp Ph u im - S thit b n gin - D tnh ton thit k - D vn hnh -Qutrnhlintcctht ng ha - Gi thnh thit b thp - t tiu hao tc nhn sy kh -Ccchthpthlcc glycol: +dchto,tanhonton trong nc vi bt k t l no + khng n mn cho php dngkimloirtinch to thit b +lmgimnhitng cca dungdch ncc thdngdungdchncca ccglycollmchthpth nc nhit m - Ctht c imsng thpvsgiimcaotrong khongrngcaccthngs k thut -Sthayinhitvp sut khng gy nh hng ln n cht lng sy -Qutrnhrtthuntinv n gin Nhc im - Ssykh bng glycol c thchinnimsng khng thp hn -25 -30oC munsytrithncn dngdungdchglycolm chnlmgiatngstiu hao glycol cng vi kh kh. -Chtlngsyphthuc vos thay i nhit v p sut- Chiphu t xy dngcc thit b cng sut ln rt cao - Chi ph vn hnh ln -Khngcccqutrnhlin tc -Hiuqucaccchthp ph gim do b nhim cc cht chng n mn, cc tp cht c hc Phi thay th cht hp ph n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 6 Phn III: TNH TON THP HP TH LM KH KH BNG TEG 1. Cht Hp Th Lm Kh Kh TEG (Trietylen glycol) - CTPT: HO CH2 CH2 O CH2 CH2 O CH2 CH2 OH -TEG c s dng lm chthp th vp ng c cc yu cu ca mt cht hp th: - C ht m cao. - C p sut hi bo ha nh trnh tht thot khi ti sinh. - D ti sinh t nng cao - Nhit si khc nhit si ca nc c th d dng tch nc (d dng nh hp th ti sinh cht hp th). - nht nh d dng luthngtrongthpvtip xcttvihn hp kh trong thp hp th v thit b trao i nhit - t ha tan hoc khng ha tan Hydrocacbon - Chu c nhit lnh (khng b ng cng) khong -20 -30oC - Tnh n mn km - Kh nng to bt km khi tip xc vi dng kh - C bn nhit v bn oxy ha cao - Khng c hi cho ngi lm vic, khng gy nhim mi trng - Gi thnh r. - Mt s tnh cht ha l quan trng ca TEG Cc i lng ha lTEG Khi lng phn t Khi lng ring 25oC, g/ml im si 760 mmHg, oC im ng c, oC Nhit bt u phn hy, oC Nhit ti sinh, oC nht ng lc 25oC, cP Nhit dung ring 25 oC, kJ/kg. oC 150,2 1,119 285,5 -7,2 206,7 185 200 37,3 0,69 n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 7 - Mt s nhn xt v nh hng ca TEG n qu trnh sy kh: - Nng dung dch TEG cng cao, mc sy kh cng cao, tc l kh sau khi sy c im sng cng thp. - h im sng AT cho bit mc sy kh ca cht hp th. h im sng ph thuc vo nng dung dch TEG, nhit tip xc ca dung dch TEG vi kh m v lu lng ti dung dch TEG: + Nng glycol sch l yu t nh hng mnh nht n im sng cakh,ncaohnngayckhitnglulngtunhonglycol. Mun lm kh trit th cn dung dch glycol c sch cng cao. +NhittipxccadungdchTEGvikhmcngln,h im sng cng cao. +KhigimnngTEG(tcllngnctrongthphpthtng ln) nh hng ca lu lng nc ti dung dch TEG n AT gim i. ( th hnh 1). Trongthctthngsdng mtti10 35ltTEGcho 1kg hi m tch khi kh.- TEG c nhit phn hy cao (Tph = 206,7oC) nn trong thit b ti sinh TEG, nhit c duy tr trong khong 185 200oC v c th ti sinh TEG m khng cn chn khng (thp nh hp th khng cn lm vic iu kin chn khng). Hnh 1:S ph thuc h im sng ca kh vo mt ti dung dch TEG Hnh 2:S ph thuc p sut hi bo ha ca TEG vo nhit n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 8 Tm li, vi cc u im ca TEG nh:- C ht m cao,- To c im sng cho kh sau lm kh kh cao (47oC) - Khi ti sinh d dng thu c dung dch c nng khi lng cao trn 99%Nn n c dng trong hu ht cc h thng lm kh kh. 2. S Nguyn Tc Cm Thit B Hp Th Lm Kh Kh Bng TEG * K hiu thit b: * K hiu dng: 1: Thp hp thI: Kh ngyn liu m 2, 4: TB trao i nhitII: Kh lm kh3: TB thi kh tch III: Dng TEG giu ra khi Hydrocacbon ha tan y thp hp th 5: Thp ti sinhIV: Dng hi nc (c mt t TEG) 6: TB gia nhit V: Dng TEG b sung nu cn 7: TB lm ngui VI: Dng TEG ti sinh (TEG ngho) 8: Bn cha VII: dng hi nc qu nhit 9: Bmhoc dng du nng VIII: Kh thi ra IX: Hi nc i vo kh quyn n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 9 - iu kin lm vic ca thp hp th: Qu trnh hp th ta nhit nn lm vic nhit thp(15 38oC) trnh chy nht v p sut cao (6 8,5 MPa). - iu kin lm vic ca thp ti sinh: Lm vic p sut thp (1 1,2 bar) v nhit cao (115 oC s T s TphnhyGlycol), nhit ln hn 115 oC (nhit si ca nc) nc bay hi ht. - Thuyt minh s :Trong thp hp th 1, dng kh m i t di ln cn dung mi hp th TEG c ti t trn xung, hi nc b dung dch TEG hp th. Kh c sy kh i ra nh thp, cn dung dch TEG hp th nc cly rapha di.TEGhpthncquathit btrao i nhit 2 c un nng s b i vo TB thi kh 3 tch Hydrocacbon b hp th. Tip theo, TEG c un nng trong TB trao i nhit 4 v TB gii hp th 5. Hi nc gii phng i ra pha trn ca thp gii hp th 5, phn cn li l TEG ti sinh c lm ngui trong TB trao i nhit 4, 2 v sinh hn 7, i vo bn cha 8, t y bng bm 9 s i vo TB hp th 1 (bn cha 8 s c b sung mt lng glycol mi khi cn thit).

n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 10 3. Tnh Ton Thp Hp Th Lm Kh Kh Bng TEG Bc 1 : C th ha cc s liu ban u - Thnh phn kh ngyn liu Cu tC1 C2C3n-C4n-C5n-C6H2SN2 CO2 %V805.23.83.53.02.50.51.00.5 - Lng kh cn lm kh: 4 triu Nm3/ngy= 166666,67 Nm3/h - Nhit kh vo:60oC - p sut kh vo: 7,5 MPa - im sng yu cu:+10oC - p sut kh kh: 7,3 MPa - Lu lng ring TEG ngho: 30 kg TEG/1 kg H2O Bc 2: Xc nh nng ti thiu min ca TEG Da vo nhit tip xc Ttx (bng nhit ca kh nguyn liu) v im sng ca kh sy kh xc nh nng ti thiu min ca TEG cn thu c im sng cho trc ca kh thng qua th hnh II.8 (trang 98 [1]). Trong thp tip xc (contactor), TEG sch ch tip xc vi kh ti mm trn cng cn cc mm di nng TEG b gim i do hp th nc. Cho nn trong thp tip xc, im sng thc t ca kh lm kh s cao hn t 5 - 8oC so vi im sng cn bng. Theo bi cho im sng ca kh kh yu cu l +10oC. Chn im sng thp hn 8oC.Vy nhit im sng ca kh kh tra th s l 2oC. Theo bira,nhit ca khnguyn liul60oC, do qu trnhhpthl qu trnh ta nhit nn lm vic iu kin nhit thp trnh chy nht (15 - 38 oC). Thng th nhit lm vic ca thp hp th xp x nhit mitrngnnkhnguynliutrckhivo thptalmlnh bngkhng kh t 60oC xung 40oC. Nhit kh nguyn liu vo thp (nhit tip xc) l 40oC. T th hnh II.8 ta c ta ca: im sng cn bng2oC v nhit tip xc(bngnhitkh nguynliu) 40oCrivo ngnng TEG sch l 98%. y chnh l nng TEG sch yu cu. Vy min = 98%. n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 11 Bc3:Xcnhhmlngmcakhnguynliu W1vhmlngm ca kh thnh phm W2 Theo bi ra thnh phn ca kh nguyn liu c lng H2S chim 0,5%V. Vy hm lng ca H2S c xc nh nh sau: - Trong 1 std m3 (= 1000 lit) kh nguyn liu cha th tch H2S l: IH2S = 1000.0,5100 = 5 (lt) - ktc: T = 15 + 273 = 288oC, P = 1atm T PT trng thi: PV = nRT, khi n = 1 mol ta c th tch ca 1 mol kh VM l: VM = RTV = 0,082[I.atmmoI.K.288K1atm = 23,6 l/mol - S mol ca H2S chim trong 1std m3 kh nguyn liu ktc l: nH25 = VH25VM = 5I23,6I/ moI = 0,2119 mol Khi lng ca H2S chim trong 1std m3 kh nguyn liu ktc l: m H25= 0,2119 34 g/mol = 7,2046 g = 7204,6 mg/std m3 >> 5,7 mg/ std m3 Theo quy c: kh chua l kh c hm lng H2S > 5,7 mg/ std m3 M trong thnh phn kh nguyn liu cn c c CO2: %IC02= 0,5 %. Vy kh nguyn liu cho l kh chua nn khi xc nh hm lng m ca kh nguyn liu phi xt c hm lng m do H2S v CO2 ng gp. p dng CT tnh hm lng m W1 ca kh nguyn liu i vi kh chua: W1 = yHC .WHC + yCO2. WCO2 +yH2S. WH2S Trong : WHC hm lng m ca thnh phn Hydrocacbon trong kh. wH2 Shm lng m do H2S ng gp wC02 hm lng m do CO2 ng gp yH2Sphn mol ca H2S yCO2phn mol ca CO2 yHC phn mol ca Hydrocacbon,( yHC = 1 - yH2S- yCO2) n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 12 Hnh 1: th tra hm m kh t nhin ngt cc p sut v nhit (Trang 79, [3]) n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 13 Hnh 2: th tra hm m do CO2 ng gp(Trang 84, [3]) Hnh 3: th tra hm m do H2S ng gp (Trang 85, [3]) n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 14 Ti T nguyn liu = 40oC v P = 7,5 Mpa: + T th hnh 1c: WHC = 1050 kg/106 std m3 + T th hnh 2 c:wC02 = 1300 kg/106 std m3 + T th hnh 3 c: wH2 S = 1700 kg/106 std m3 W1 = 0,99. 1050 + 0,005. 1300 + 0,005. 1700 = 1054,50 (kg/106 std m3) Ti T kh kh = 10oC v P = 7,3 Mpa:+ T th hnh 1c: WHC = 197 kg/106 std m3 + T th hnh 2 c:wC02 = 340 kg/106 std m3 + T th hnh 3 c: wH2 S = 420 kg/106 std m3 W2 = 0,99. 197 + 0,005. 340 + 0,005. 420 = 198,83 (kg/106 std m3) Bc 4: Lu lng dung mi tun honL1 = V.( W1 - W2 ).l , kg/h Trong :V - th tch kh bm vo (m3/h) l - lu lng ring cht hp th (kg/kg H2O) W1, W2 - hm m ca kh nguyn liu v kh thnh phm (kg/ m3) L1 =166666,67.(1054,50 198,83).10-6.30 = 4278,35 (kg/h) Bc 5: Nng dung dch TEG giu (bo ha) ra y thp o2 - T phng trnh cn bng vt cht da trn m trong pha lng v kh, ta c: 2=L11L1+ ( W1 W2) V -ChnnngbanucadungdchTEGl1=98%bngnngti thiu ca TEG l min= 98% T suy ra :2=L11L1+ ( W1 W2) V=4278 ,35 98427 8,35 + ( 10 54,5 0 198 ,83) 10-6 16 6666,67= 94,8% Bc 6: Lu lng dung dch TEG giu ra khi y thp L2 L2 = L1 + (W1- W2).V, kg/h L2 =4278,35 + (1054,50 198,83).10-6. 166666,67 = 4420,96 (kg/h) Bc 7: Hng s cn bng K K =W2[ ( 1 1) . M o+ 18. 1]748 ,44M o( 1 1) Trong : Mo - khi lng phn t ca cht hp th: MTEG = 150 vC n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 15 W2 = 198,83 kg/106 std m3 = 198,83.10-3 g/ m3 K = 198,83.10-3[ ( 1-0,98) .150+18.0,98]748,44.150.( 1-0,98) = 0,0018 Bc 8: Xc nh yu t hp th A theo cng thc: A =LKV Trong :L- lu lng dung mi TEG vo thp tnh ra Kmol/h V - lu lng kh cn lm kh tnh ra Kmol/h - Xc nh L t L1:Theo tnh ton trn ta c L1 = 4278,35 kg/h.Khi lng phn t trung bnh ca dung mi hp th:M tb=98 150 + 1 8 2100= 147,36 L=L1Mtb=4278,35147,36 = 29,03 (Kmol/h) -Xc nh V t V:V =VV1S

Vi V15: th tch ca mt mol kh chim 15oC v 1atm. V15 = Po.VoTo.P1S = 1atm.22,4 .( 15+273)273.1atm = 23,6 l/mol = 23,6 m3/Kmol V =166666,6723,6 = 7062,12 (Kmol/h) Vy: A =29,030,00187062,12= 2,28 Bc 9: H s tch m thc t ca qu trnh hp th T=W1W2W1=10 54,50 198,831 054,5 0= 0,8 1 Bc 10: H s tch l thuyt c ch n lng nc trong TEG ngho L=T Yn+1Yn+1 K X0 Trong : -Xoi: nng phn mol ca nc trong dung dch TEG ngho n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 16 X0=1 1181 118+1Ho=1 0,98181 0,9818+0,9815 0= 0,1 453 -Yn+1: phn mol nc trong kh nguyn liu Yn+1 = W1.23,618 = 1054,50.10-6.23,618 = 0,0014 L = 0,810,00140,0014-0,00180,1453 = 0,996 Bc 11: Xc nh s a l thuyt ca thp hp th da vo PT Kramser (rt gn): L = An+1-AAn+1-1 An+1 = L-AqL-1 n + 1 = Iog_L-AL-1]IogA= Iog[0,996-2,280,996-1 Iog2,28 = 7,003 Vy s a l thuyt ca thp l: nL = 6,003 a Bc 12: Xc nh s a thc ca thp hp th nthc = nLq

Trong : q - hiu sut lm vic ca a, 0,25 s q s 0,4 Chn q = 0,35 nthc = 6,0030,35 = 17,15 ~ 18 a Vy s a thc t ca thp l: nthc = 18 a Bc 13: Tnh ng knh D ca thp hp th = 0 ,0114_0,1. . I. P(m )Trong : Q lu lng kh nguyn liu, m3/h T nhit kh nguyn liu, K P p sut kh nguyn liu, Mpa vn tc tuyn tnh ca dng kh trong thp (0,05-0,15 m/s) Chn = 0,13 m/s = 0,13.3600 = 468 m/h D =0,0114* _0,1166666,67( 40+273)468.7,5= 0,4395 (m) Vy ng knhca thp hp th: D = 0,4395 m ~ 440 mm n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 17 Bc 14: Tnh chiu cao H ca thp hp thH = nthc *d+ h Trong : d khong cch gia 2 a, thng chn 0,5m hoc 0,6 m h chiu cao chp di v chp trn ca thp, h =1 1,2 m Chn d = 0,6 m v h = 1,2 m H = 18 * 0,6 + 1,2 = 12 (m) Vy chiu cao ca thp hp th: H = 12 m 4. Kt lun Vy vi cc thng s ca khnguyn liu cho, ta cn thit k thp lm kh kh bng TEG vi cc thng s nh sau: Cc thng s Kh nguyn liu : Lu lng (m3/h) Nhit (oC) p sut (Mpa) Hm lng m W1 (kg/m3) 166666,67 40 7,5 1054,50.10-6 Kh kh im sng (oC) p sut (Mpa) Hm lng m W2 (kg/m3) 10 7,3 198,83.10-6 TEG ngho vo Lu lng ring (kg TEG/1kg H2O) Lu lng L1 (kg/h) Nng ti thiu omin (%) Nng o1 (%) 30 4278,35 98 98 TEG giu Nng o2 (%) Lu lng L2(kg/h) 94,8 4420,96 Hng s cn bng ca qu trnh ht m K0,0018 Yu t hp th A2,28 H s tch m Thc t L thuyt 0,81 0,996 Thp hp th S a l thuyt (a) S a thc t (a) ng knh (mm) Chiu cao (m) 6,003 18 440 12 n mn Cng ngh ch bin kh Nguyn Trang Nhung Lc ha du K52Page 18 Ti Liu Tham Kho: 1. Cng Ngh Ch Bin Kh Thin Nhin V Kh Du M Hong Minh Nam dch Trng H K thut Thnh Ph H Ch Minh 2. Gas Conditioning And Processing, Volume 1 John M. Campbell 3. Cng Ngh Ch Bin Kh T Nhin V Kh ng HnhNguyn Th Minh Hin NXB Khoa hc k thut H Ni Fi l ename:DA Che Bi en Khi1.docx Di r ect or y:D:\ Bil m Templ at e:C:\ User s\ Nhungcool\ AppDat a\ Local \ Chemi st r y Add-i n f orWor d\ Chemi st r y Gall er y\ Chem4Wor d.dot x Ti t l e: n mnCng ngh ch bi n kh Subj ect :Aut hor :N Keyw or ds: Comment s: Cr eat i on Dat e:11/ 5/ 2011 11:02:00 AMChange Number :4 LastSaved On: 11/ 5/ 2011 11:20:00 AMLastSaved By: N Tot alEdi t i ng Ti me:1 M i nut e LastPr i nt ed On: 11/ 5/ 2011 11:21:00 AMAs ofLastCompl et e Pr i nt i ng NumberofPages:18 NumberofWor ds:3,123 (appr ox.) NumberofChar act er s:17,804 (appr ox.)