TAP CHI HOA HOC
DOL 10.15625/0866-7144.2015-0089
T. 53(1)62-67 THANG 2 NAM 2015
HOAT TiNH XUC TAC CUA CAC C H A T L 6 N G ION TREN CO SCf IMIDAZOLIUM TRONG PHAN U'NG ESTE HOA AXIT BEO
Pham Thi Nam Binh*, ©ang Thi Thiiy Hanh, Vu Thi Thu Ha, |Mai Tuyen|
Phdng TNTD Quoc gia vi Cong nghe Igc - hda ddu, Vien Hda hgc Cdng nghiep Viet Nam Din Tda soan 10-10-2014; Chip nhin dang 13-2-2015
Abstract
Several imidazolium-based ionic liquids were prepared and screened as catalysts for the esterification of oleic acid with methanol. The experimental results showed that both the type of anion and the length of alkyl chain in the cation have effects on the catalytic activity of ILs. In all of the ILs investigated, l-decyl-3-methylimidazolium hydrogen sulfate (CiomimHS04) performed the best activity.The esterification of PFAD in the precence of CiomimHS04 was investigated. This catalyst showed good catalytic under mild conditions, the conversion of PFAD could reach 97.82 % after the esterification was c'arried out at 65 "C for 4 h, Futhermore, the catalyst could be reused at least 5 times, showing good operational stability. Thus, C]omimHS04 is a promising catalyst for conversion of high free fatty acid (FFA) feeds to biodiesel.
Keywords. Ionic liquids, imidazolium, esterification, PFAD.
1. MO DAU
Trong nhihig nam gin diy, chit ldng ion (IL)vdi vai trd xuc tac cho chuyen hda biodieselda thu hiit dugc nhieu su quan tam chii y cua cic nha nghien ciiu. Xuc tae IL cd rit nhieu uu diem vl ky thuat, cdng nghe nhu hogt tinh cao d dilu kien nhiet dg, ap suit thudng; thich hgp vdi hiu hit cac logi nguyen lieu; de tach ra khdi sin pham [1-7]. Hien nay,phan ldn cac xiic tic IL hogt ddng tot d khoang nhi?t dg 130-170 °C vdi ham lugng xiic tac dudi 10
% hoac d khoang nhiet do dudi 100 "C vdi ham lugng xiic tic 20-24% [1-6]. Dilu nay khiln cho gia thanh cua sin phim blodlesel vin cao, chua dap iing y8u cau cdng nghiep.
Vdi muc tieu tim ra mgt logi xiic tic cd hogt tinh cao d khoing nhiet do va ham lugngthip hon, bai bao nay di vao tdng hgp mdt sd IL va sang Igc hoat tinh xiic tic cua chung ddi vdi phan iing este hda.
Xuc tic IL tdt nhit dugc sti dung dl tong hgp biodiesel tir nguyen lieu hdn hgp axit beo phi thai ciia qua trinh tinh luyen diu cg (PFAD).
2. THUC NGHIEM
budc tinh chi. PFAD (ngudn gdc Calofic, Viet Nam) cd thanh phan hda hgc dugc trinh bay trong bang 1.
Bdng 1: Thanh phin hda hgc cua PFAD
2.1. Hoa chat va thiet bi
Cac hda chit cd ngudn gdc tii Sigma-Aldrich va Spectrum China dugc sir dung true tilp, khdng qua
TT 1 2 3 4 5
Axit Palmitic Linoleic Oleic Stearic Khac
Ham lirong, % 28,09 18,02 43,47 9,53 0,89 Pho H va "C NMR ciia IL duprc ghi tren may Brulcer AVANCE-500 MHz va Brulcer AVANCE- 250 MHz. Tinh chat nhiet cua IL dugc nghien ciiu tren may DTG-60H Shimadzu. ThiSt bj Hanna HI- 8314 pH meter dugc s i dung da xac djnh gia tri pH Clia cac dung dich IL voi n6ng do 0,1M a nhiet do 20 °C.
2.2. Tong hop IL
2.2.1. TdnghcrplL 1-metylimidazolium (HmimX)
Nho gigt dung dich nuoc chua 0,2 moi HX (vdi X la CI, BF,, CH3SO3 va HSO,) vao 0,2 moi N- metylimidazol (mim) da dugc lam lanh sin v8 0 "C trong dieu kien co khuay. Sau do khuSy h6n hgp
TCHH, T. 53(1), 2015
phan ling trong 2 gid d nhi?t do phdng. Ket thiic phan umg, sin phim dugc siy d 90 "C dudi ap suat 0,1 Bar trong 12 gid de loai bd nude. San phim thu dugc la cac chat ldng khdng mau hoac vang nhgt, sinh.
2.2.2. Tdng hgp l-ankyl-j-metylimidazolium hydrogen sulfat (C„mimHSO.^
Quy trinh tdng hgp CnmimHSOa gdm 2 giai dogn.
Tdng hgp l-ankyl-3-methyl imidazolium bromid (C„mimBr).
2,2 moi cua 1-bromoankan (1-bromobutan, 1- bromohexan, 1-bromooctan hogc 1-bromodecan) va 2 moi mim dung trong binh ciu dung tich 1000 ml cd lap khuiy tir v i sinh ban. Khuay hdn hgp qua dem d nhiet dg phdng, sau dd khuiy d 60 °C trong 72 gid. Sau phan iing, sin pham dugc nia 3-5 lin bing etyl axetat va siy dudi dung mdi trong tii siy chin khdng d 70 °C dudi ap suit 0,1 Bar.
Trao ddi anion HSO/
2 moi CnmlmBr (vdi n = 4, 6, 8 hoac 10) dugc d\mg trong cdc thuy tinh chju nhiet dung tich 1000 ml v i lim lanh ve 0 °C. Nhd gigt chim 2 moi H2SO4 (98 %) vao CnmimBr. Khuiy hdn hgp phin umg d 0
°C trong 8 gid, sau dd d 80 °C trong 72 gid dl hinh thanh CnmimHS04. Sin phim la cae chit ldng cd mau vang dd, do dim mau va do sanh ciia san pham ting theo chilu tang dd dal mach ankyl.
2.3. Phan ung este hoa axit beo
Phan ling dugc tien hanh trong binh ciu 3 cd dung tich 100 ml cd lip sinh han, nhi?t ke va khuiy tii. Tdc dO khuiy dugc giii khdng ddi (500 vdng/phiit) trong mgl thuc nghi?m.
Hdn hgp sau phin iing dugc lam Ignh ngay ve nhiet do phdng va chuyen sang pheu chiet. Sau khi dl ling, hdn hgp tach thanh 2 pha. Mdt pha giau sin phim metyl este va nguyen lieu du, pha cdn lai giau xiic tac, nude va metanol du. Pha giau san phim metyl este dugc tach rieng va riia vai lan bang nude ndng (70-80 °C) sau dd siy d 110 °C trong 8 gid.
Xuc tac dugc thu hoi va tai sir dung sau khi da loai bd methanol du va nude d 90 °C trong 24 gid dudi ap suit thip (0,1 Bar).
2.4. Phan tich san pham
San phim ciia phan iing este hda dugc xie djnh tri so axit theo tieu chuin ASTM D974. Do chuyen hda nguyen lieu dugc xac dinh theo tn sd axlt ciia nguyen ll?u ban diu vi san pham theo cdng thiic [3, 6].
Phgm Thi Nam Binh vd cgng su
C(%) = 1Q0. °
Trong dd, Ao la tri sd axit ciia nguy6n li?u ban diu va Al la tri sd axit cua sin pham.
3. KET QUA VA THAO LUAN
3.1. Sang loc xuc tie JL cho phan ung este boa Qua trinh sang Igc xiic tic dugc thuc hien thdng qua phin iing este hda axlt oleic trong su cd mgt ciia cic IL d nhiet dg 65 °C trong 2 gid vdi ty le moi methanol/oleic = 2, IL chiim 10 % khdi lugng axit.
Cac k8t qua ve dg chuy6n hda axit oleic khi sii dung xue tac IL va gia trj pH cua dung djch IL dugc trinh bay trong bang 2.
Bdng 2 : Dg chuyen hda axit oleic va gia tri pHcic dung djch IL
STT 1 2 3 4 5 6 7 8
Xiic tac HmimCI HmimBF, HmimCHiSOj HmimHSO, CjmimHSO, CsmimHSO, CmimHSO, CiomimHSO,
Do chuyen hoa
(%)
7,62 16,50 22,67 19,65 43,59 56,20 72,35 78,96
pH 4,78 2,30 1,52 1,61 1,49 1,47 1,43 1,28 Cac IL (1-4) cd chung cation nhung khic nhau ve anion. So sanh gia trj do chuyen hda axit thu dugc sau phan irng este hda sir dyng cac xuc tac nay cho thiy anion cd inh hudng rd ret din hoat tinh xuc tic cua IL. Gia tri pH cua cac dung djch IL cho thiy dg axlt ting theo trat tu cua day : HmlmCI <
HmimBF4 < HmimHS04 < HmimCHaSOj. Cung theo trat tu nay ma gia tri do chuyen hda ting. Trong 4 IL ke tren, HmimCHsSOa cd hogt ti'nh cao nhat, sau dd din HmlmHS04. Hogt tinh xiic tic cua IL chiia anion HSO4 thap hon khdng nhieu so vdi anion CH3SO3, song nd Igi cd the tdng hop tii hda chit phd biin va cd gia thanh thap han rat nhieu. Do do, HSO4 dugc lua chgn la anion ciia cac IL khao sat tiep theo.
Cac IL(4-8) gidng nhau ve anion va chi khac nhau ve dg dai mach ankyl d nhdm the N(l) trong cation. Khi so sanh gia tri pH cac dung dich IL(4-8) ta cd dugc thii tu ting dg axit nhu sau:
HmimHS04 < C4mlmHS04 < CemimHSO^ <
C8mimHS04 < CiomimHS04, day cung la chilu tang do dai mgch ankyl. Cd the giai thich dilu nay la do mgch ankyl cang dai thi kha nang tach it ra khdi
TCHH, T. 53(1), 2015
cation cang de, din din do axit cang eao [7]. Quan sat thiy gia tn dg chuyln hda ciing ting theo trinh tu cua day tren. Nhu vgy, mach ankyl trong cation cang dai, do axit ciia IL cang cao thi dg chuyen hda axit thu dugc cing ldn.
Qua cic kit qua thuc nghiem cho thiy hoat tinh xuc tic Clia IL trong phin iing este hda axit beo cd thi thay ddi dugc bing each dieu chinh anion vi/hoac cation cau thinh nen EL. Trong 8 IL dugc khao sit trong hai bao nay, CiomimHS04 cd hogt tinh xiic tic tdt nhat. Do chuyln hda axit oleic dgt 78,96 % d nhi?t dg 65 "C trong thdi gian 2 gid vdi ty 1? moi metanol/oleic la 2, ham lugng xuc tic 10 % so vdi khoi lugng oleic. Xuc tac CiomimHS04 dugc lira chgn de nghien ciiu dieu kien chuyen hda biodiesel tir nguyen ll?u thirc Ii PFAD.
Hogt tinh xuc tdc cua cdc chdt long.,.
ting nh? (89,4 %). Vi viy, him lugng CiomimHSO<
dugc lira chgn la 10 % so vdi khdi lugng PFAD.
3.2.2. Ty l^ moi giiia metanol vd PFAD
Cac thgc nghiem dugc tien hanh d dieu kl?n 65
"C, 6 gid, ham Iugng xiic tic 10 % (tinh theo khoi lugng PFAD), ty le moi metanol/PFAD dugc khao sat trong khoang l-=-27. Kit qua dugc trinh bay tren do thi hinh 2.
Khi ty le moi metanol/PFAD tang tir 1 len 9, dp chuyen hda tang tir 71,7 len 97,9 %. Dieu nay phii hgp vdi nguyen Iy chuyen dich can bang. Khi ty 1^
moi metanol/PFAD tang Ien den gia tri 18 va 27, dg chuyen hda PFAD hiu nhu khdng thay ddi.
3.2. Cac yeu to anh hudng den chuyen boa este tir nguyen lieu PFDA su dung xiic tac CiomimHS04
Cic yeu to inh hudng den phin ung este hda PFAD dugc khio sit bao gdm: him Iugng xiic tac, ty 1? moi metanol/PFAD, nhiet do v i thdi gian phan irng.
3.2.1. Hdm lugngxHc tdc
Cic thuc nghiem dugc tiln hanh d dilu ki?nnhi?t dO 65 "C trong 6 gid, vol ty 1? moi metanol/PFAD = 2:1, ham Iugng xiic tic dugc khao sat trong khoing tii 0-15 % (tinh theo khdi luong PFAD).
100
0 2.5 5 7.5 10 15 Him luong xiic tac, % khdi lugng PFAD Hinh 1: Anh hudng ciia ham lugng xuc tac din
do chuyln hda PFAD
Ket qui cho thay xu hudng tang do chuyln hda PFAD khi ting ham lugng xiic tac (hinh 1). Do chuyln hda tang tir 7,2 din 88,2 % khi ham luong xiic tac tang tir 0 len 10%. Khi tang ham lugng xiic tic Ien mgt lugng dang kl (15 %), do chuyln hda chi
11
1 2 5 9 18 27Ty If moi methanol/PFAD LTinh 2: Anh hudng ciia ty le moi metanol/PFAD
din dd chuyln hda PFAD Dilu nay dugc giai thich la do PFAD va xiic tac da bj pha loang khi sir dung mgt Iugng qua dir metanol, lam glim khi nang tilp xiic giira chiing, dan den lam giam hl?u qua cua qui trinh. Them vao dd, metanol cd mat vdi mgt lugng ldn trong hon hg]]
se tang chi phi qua trinh tach va tinh che san pham.
Do vay, ty le moi metanol/PFAD thich hgp la 9.
3.2.3. Nhiit dg phdn ung
Cac thuc nghiem dugc tiln hanh d dilu kien ^ le moi metanol/PFAD = 9, ham lugng xuc tac 10 % (tinh theo khdi lugng PFAD), thai gian phan iing 6 gid, nhiet do phan iing duoc khao sit trong khoang 35-75 °C.
Quan sit thiy xu hudng ting do chuyln hda khi tang nhi?t do phan img (hinh 3). Cf 35 °C, dg chuyln hda PFAD chi dat 78,5 %. Tang nhiet dg len 65 °C, dd chuyln hda PFAD tang Ien 97,89 %. Tuy nhien khi nhiet dg phan img ting len 75 °C, gia trj dg chuyen hda PFAD thay ddl khdng dang kl.
Nhu vay, nhiet do thich hgp cho phan iing
TCHH, T. 53(1), 2015
chuyen hda PFAD bing metanol sir dung xuc tac C,ominiHS04 la 65 °C.
35 45 55 65 Nhiet do phan ung, "C Hinh 3: Su phu thugc do chuyen hda PFAD vao
nhiet dg phan iing 3.2.4. Thai gian phdn ung
Cac thuc nghiem dugc tien hanh d dieu kienty le moi metanol/PFAD = 9, ham lugng xiic tic 10 % (tinh theo khdi lugng PFAD), nhiet dd phan iing 65
°C, phin ling keo dai tir 1-7 gid. Su phu thugc do chuyen hda vao thdi gian phan iing dugc the hien tren do thi hinh 4.
Phgm Thj Nam Binh vd cdng sir Tir cic kit qua nghien ciiu ve phan iing este hda giira PFAD va metanol sii dung xiic tac CiomimHS04, cd the dua ra dieu ki?n thich hgp cho phin ling nay nhu sau: nhi?t do phin iing 65 °C, thoi gian 4 gid, ham lugng xuc tic 10 % so vdi khdi Iugng PFAD, ty 1? moi metanol/PFAD = 9. CJ dilu kien nay, do chuyen hda PFAD dgt dugc la 97,82 %.
3.2.5. Tdisirdimgxuc tdc
Xuc tac sau phan irng dugc tinh chi va sir dung quay vdng trong phan ung chuyen hda PFAD d ciing dieu kien phan irng.
Cac sd lieu dua ra trong bang 3 cho thay su glim nhe do chuyen hda sau mdi lin til sii dung xiic tac, dieu nay cd the giai thich la do trong qua trinh tich va tai sinh da xay ra su mit mat xuc tac. Sau 5 lan sii dung xiic tic, do chuyen hda nguyen li?u giam khoing 3 %.
Bdng 3: Do chuyen hda PFAD sau mdi vdng til sii dung xiic tac CiomimHS04
0 1 2 3 4 5 6 Thdi gian phan iing, gid Hinh 4: Anh hudng cua thdi gian phan iing den
do chuyln hda PFAD
Dd thj sg phu thugc do chuyen hda PFAD vao thdi gian phan iing cd the chia thanh 3 giai doan. O glal doan diu tien, phin iing giira mgt Iugng du metanol vdi nguyen lieu da xiy ra tuong ddi de dang, kit qua la tren 89 % nguyen lieu dugc chuyen hda thanh san phimtrong 1 gid. 6 giai dogn 2, lugng nguyen lieu giam dang kl da lim cho tdo do phin ling chim lgi, do chuyen hda nguyen lieu dgt gii tri 97,82 % sau 4 gid phan iing. Trong giai doan 3, phan ling este hda tiln din trgng thai can bing, dg chuyln hda gin nhu khdng thay ddi khi keo dai thdi gian phan iing tir 4 den 7 gid. Do do, cd the dimg phin ling d thdi diem 4 gid.
So vong chay 1 2 3 4 5 6
Do chuyen hoa (%) 97,82 97,14 96,38 95,75 95,01 94,71 4. KET LUAN
Da tdng hgp thinh cdng va thir nghiem boat tinh xiic tie trong phan irng este hda ciia 8 IL axit Bronsted tren co sd imidazolium. Ket qua cho thiy CiomlmHS04 cd hoat tinh xuc tac tdt nhit.
Qua trinh chuyen hda este tir nguyen lieu phi thai la PFAD sir dung xiic tic CiomimHS04 cho hieu qua cao. 97,82 % PFAD dugc chuyen hda thinh este d dieu kien 65 "C trong thdi gian 4 gid.
Hon nifa, xiie tic cd the sii dung 5 Iin vdi do chuyln hda dgt 95-97,8 %. Day la mdt xiic tic cd tilm nang cho qua trinh chuyen hda este tir cac ngudn nguyen lieu cd tri sd axit beo cao.
Ldi cam on. Cdng trinh nghien cthi ndy dugc tdi trg bai Di dn phdt trien nhien iiiu sinh hgc din ndm 2015, tdm nhin den ndm 2025, Bg Cdng Thuang.
TAI LIEU THAM K H A O
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65
TCHH, T. 53(1), 2015
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8. Pham D6 Thanh Thiiy. Bao cdo ldng kit Dk tai Nghien ciru cong nghc dieu che xiic tdc de sdn xudt dtezen smh hgc BlOO true Hep tir nguyen lieu co Iri so axit cao theo cong nghe lien tuc thuoc De dn phdt then nhien lieu sinh hoc den ndm 2015, tdm nhin din ndm 202S (2013).
Phu luc
Du lieu ph6 ' H - N M R , " C - N M R , va TO-DTA Clia tat ca cac ILs tong hgp trong bai bao:
1-methylimidazolium hydrogen sulfate: ' H NMR (500 MHZ, D2O): 5 = 3,791 (s, 3H); 7,308 (s, 2H)- 8,525 (s, IH); "C NMR (125 MHz, D2O): 6 = 35,582; 119,609; 123,092; 135,131. Nhiet do phan hily Clia HmimHSOi: 363,02 "C.
1-methylimidazolium cloric: 'H NMR (500 MHz D2O): S = 3,889 (s, 3H); 7,406 (s, 2H); 8,624 (s, IH); "C NMR (125 MHz, DjO): 5 = 35,517- 119,522; 123,030; 135,029. Nhiet do phan huy ciia HmimCI: 235,76 °C.
Hoat tinh xuc tic cita cac chdl long.,, 1-methylimidazolium tetrqfluoroborat: H NMR (500 MHz, D2O): S = 3,906 (s, 3H); 7,413 (s,2H);
8,602 (s, IH); "C NMR (125 MHz, D2O): 8 = 35,607; 119,656; 123,186; 135,194. Nhi?t dp phin huy cua HraimBF,: 307,61 °C.
1-methylitnidazolium methanesulfonat: H NMR (500 MHz, D2O): 8 = 2,759 (s, 3H); 3,893 (s, 3H);
7,410 (s, 2H); 8,623 (s,lH) );"C NMR (125 MHz, D2O): 8 = 35,628; 38,648; 119,644; 123,161;
135,137. Nhiet do phan hiiy cua HmimCHjSOi:
326,72 °C.
l-butyl-3-methylimulazolium bromide: ' H NMR (250 MHz, D2O): 6 = 0,79-0,85 (t, 3H); 1,21-1,24 (m, 2H); 1,77 (m, 2H); 3,83 (s, 3H); 4,10-4,16 (t, 2H); 7,38-7,44 (m, 2H); 8,69 (s, IH). '^C NMR (62,9 MHz, D2O): 8 = 12,75 (CH3); 18,83(CHi);
31,38 (CH2); 35,96 (N-CHj); 49,40(NCHj);
122,21(NCH); 123,61 (NCH); 135,96 (N(H)CN), Nhiet dg phan hiiy ciia C4mimBr: 300 °C.
l-hexyl-3-methylimidazolium bromide: 'H NMR (500 MHz, CDCI3): 5 = 0,86-0,89 (t, 3H); l,31-l,9S (m, 8H); 4,14- 4,17 (s, 3H); 4,33- 4,36 (t, 2H); 7,38- 7.72 (s, 2H); 10,28 (s, IH). "C NMR (125 MHz, CDCI3): 6 = 13,68 (CHj); 22,11 (CH2); 25,60 (CH,);
30,00 (CH2); 30,80 (CH2); 36,48 (NCHj); 49,84 (NCH2); 121,89 (NCH); 123,61 (NCH); 136,91 (N(H)CN). Nhiet do phan huy cua CsraimBr:
296,39 °C.
l-octyl-3-methylimidazolium bromide: 'H NMR (500 MHz, CDCI3): 8 = 0,85-0,88 (t, 3H); 1,23-1,94 (m, 12H); 4,12-4,14 (s, 3 H ) ; 4,32-4,35 (t, 2H); 7,55- 7.73 (s, 2H); 10,25 (s, IH). "C NMR (125 MHz, CDCIj): 8 = 13,99 (CHj); 22,48 (CH2); 26,16 (CH;);
28,86 (CH2); 28,93 (CH2); 30,26 (CH2); 31,58 (CH2); 36,68 (NCHj); 50,04 (NCH2); 122,08 (NCH);
123,84 (NCH); 137,05 (N(H)CN). Nhiet dp phan huy Clia CjmimBr: 286,02 °C.
l-decyl-3-methylimidazolium bromide: 'H NMR (500 MHz, CDCI3): 8 = 0,84-0,89 (t, 3H); 1,22-1,92 (m, 16H); 4,09-4,14 (s, 3H); 4,29-4,35 (t, 2H); 7,51 (s, IH); 7,69 (s,lH); 10,30 (s, IH). "C NMR (125 MHz, CDCI3): 5 = 13,89 (CH3); 22,43 (CH;); 26,04 (CH2); 28,78 (CH2); 29,01 (CH2); 29,15(CH2); 29,23 (CH2); 30,13 (CH2); 31,61 (CH2); 36,54 (NCH3);
49,93 (NCH2); 121,86 (NCH); 123,64(NCH); 137,04 (N(H)CN). Nhiet do phan hiiy ciia CiomimBr:
289,99 °C.
l-butyl-3-methylimidazolium hydrogen sulfate: H NMR (250 MHz, D2O): 8 = 0,91 (t, 3H); 1,29-1,32 (m, 2H); 1,85 (m, 2H); 3,89 (s, 3H); 4,20 (t, 2H);
7,45-7,50 (s, 2H); 8,74 (s, IH). Nhi?t dp phan huy cua CimimHSO^: 337,29 °C.
l-hexyl-3-methyllmidazolium hydrogen sulfate: 'H
TCHH, T. 53(1), 2015 Pham Thi Nam Binh va Cfngstf NMR (500 MHz, D2O): 8 = 0,76-0,79 (t, 3H); 1,22 4,12 (t, 2H); 7,35 (s, IH); 7,39 (s, IH); 8,62 (s, IH).
(s, 6H); 1,77-1,80 (t, 2H); 3,81-3,86 (s, 2H); 4,09- Nhiet dp phan buy cua CgmimHSO,: 342,48 °C.
4,13 (t,3H); 7,35-7,40 (m,2H); 8,62 (s, IH). Nhiet ].decyl-3-methylimidazoltum hydrogen sulfateM dO phan huy cua CsmimHSO,: 320,33 C. NMR (500 MHz, D2O): 6 = 0,74-0,76 (t, 3H); 1,16- l-octyl-3-metkylimldazollum hydrogen sulfate: 'H 1,22 (m, 14H); 1,78 (s, 2H); 3,83-3,85 (m, 3H);
NMR (500 MHz, D2O): 8 = 0,76-0,78 (t, 3H); 1,17- 4,11-4,14 (t, 2H); 7,39 (s, 2H); 8,69 (s, IH). Nhiet 1,22 (m, lOH); 1,77-1,80 (t, 2H); 3,81 (s, 3H); 4,09- do phan hiiy ciia ComimHSO,: 342,17 °C.
Lien he: Ph^m Thi Nam Binh
Phong TNTD Cong nghe Ipc, hoa dau Vien Hoa hpc Cong nghiep Viet Nam So 2, Pham Ngu Lao, Hoan Kiem, Ha Npi E-mail: [email protected] Dien thoai: 0943 917 959.
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