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\\ KHA NANG TAY TRANG BOT HIEU SUAT CAO TlT N G U Y E N LIEU CO VOI LAI - Varisme sd 6 (VA06)
Nguyen Thi Minh Nguyet TS. Trudng Dai hoc Ldm nghiep T O M T A T
Bai bao trinh bay ket qua nghien ciiu ve kha nang tay trang ciia bpt hifu suit cao tii nguyen lieu co Voi lai Va06. Nghien ciiu su dung phucmg phap thi nghiem chuan trong cong nghe sin xuat giiy, bpt giiy, su dung cac tieu chuin TCVN va SCAN de phin tich danh gia chit lugng bpt giay sau tiy trang. Su dung hoa chit tiy la Hypoclorit Natri va Hydroperoxit voi cong ngh| tiy tring 2 giai doan (H-P), dp trang cua bpt giay co thay d6i ro ret. Voi miic diing NaClO la 5%, nhiet dp tiy la 45°C dp tring cua bpt khi ket thiic giai doan 1 da dat dupe 53% ISO. Ket thiic giai doan 2 vdi che dp tiy trang su d\mg nong dp dich tiy 3 - 4%, nhiet dp tay 80°C da thu dupe bpt CO dp trang 78% ISO. Ket qui nghien ciiu la mpt trong nhiing ca sdr de lira chpn nguyen lieu co Voi lai Va06 lam nguyen lieu san xuit bot giiy co chit luong.
Tir khoa: Bpt giay, co voi, dp trang, tay trdng.
1. DAT VAN DE
Giai doan phat trien hien nay ciia cac cdng nghe che bien sinh khdi (Bioreflneries) cd hai diem dac tnmg, mdt mat la qua trinh tich liiy va phat trien cac kien thiic nen tang, nghien Cliu siu ca che ctia qua trinh bien ddi sinh khdi, nham hoan thien cac cdng nghe thich ilng hien cd. Mat khac la nd lyc ciia cac liha nghien Cliu, vdi myc dich tim ra kha nang hien thyc hda qua trinh hda hgc va iing diuig nhung cdng nghe mdi, giii quylt cac vin dl biic thiit lien quan den tim kiem cac ngudn nguyen lieu va nang lugng mdi, dua ra cac phuang phap tien tien ve sil dimg hieu qua nguyen lieu va phi thai sin xuit.
Tay frang bdt giiy la mdt cdng doan sin xuit quan frgng, anh hudng ttii tmh chat va cdng dung ciia bdt giiy va giiy.
Nhilu nghien ciiu cho thiy, cd thi sin xuit bdt giiy tir nguyen heu thin cd Voi lai bing nhieu phuong phap. Bing each ap dung cac che do cdng nghe phu hgp cd thi thu dugc bdt giiy cd hieu suit va chit lugng tuong ddi cao.
Tuy nhien, cting nhu cac dang bdt giiy khac, bdt chua tiy tring tir cd Voi lai se cd tinh nang sii dung ban chi, vi vay viec nghien cuu kha nang tiy fring ciia nd cdng la vin d l cin thiit.
bdi tay frang chinh la mdt frong nhiing bien phap ning cao chat lugng bdt giiy.
Mat khac, kha nang tay trang va chit lugng bdt tiy frang ciia cac loai bgt giay khac nhau thudng rat khac nhau. Nd phy thudc vao dang nguyen lieu, phuang phap tao bdt giiy, hieu suit thu bgt, quy trinh cdng nghe tao bdt giay va tay trang. De xac dinh dugc cdng nghe tiy frang thich hgp can tien hanh nghien cuu qua trinh tay frang bdt giay bang cac tac nhin tiy frang khac nhau d nhiing dieu kien khac nhau.
Cd Voi lai la dang nguyen lieu mdi, tiem nang cho san xuat giay. Kit qui nghien ciiu khi nang tiy frang bdt giiy tir cd Voi lai se la ca sd xac dinh kha nang va lya chgn cdng nghe cho san xuat cac loai bdt giiy khac nhau tir nguyen lieu nay.
n. VAT UEU, PHlTONG PHAP NGfflEN CUtJ - Bdt giiy sti dung cho nghien ctru la hot hieu suit cao tir nguyen Ueu cd Voi lai Va06, tao bdt giiy nguyen lieu than cd Voi lai bing hydropeoxit bd sung xiic tie natri molipdat de thu bdt giiy hieu suit cao.
Hda chit sii dyng cho qua trinh tiy tring la hydroperoxit (H2O2) ky hieu P va hypoclorit Natri (NaCIO) ky hieu H, diy la 106 TAP CHI KHOA HOC VA CONG NGHE LAM NGHIEP SO 2-2016
cac loai hoa chit t i y tring hien dang duac sir dung tai cac nha may giay. phii hgp vdi ddi tuong bdt g i i y hieu suit cao tir cac loai nguyen lieu n g o i i go.
Thyc nghiem dugc tiin hinh tai Tmng t i m thi nghiem thyc hanh Vien Cdng nghiep gd Dai hgc L i m nghiep \ a Phdng thi nghiem Bg mdn CN Xenluloza & Giiy, Tmdng Dai hgc Bach khoa. Ha Ngi.
C^a trinh xu ly bdt giay bang cac hda chit Bang 1. Thong so cong ng
tay frang dugc tien hanh theo cac phuang phap thyc nghiem trong cdng nghe s i n xuat bgt giay: Tuy theo myc tieu cua timg qua trinh thyc nghiem, bdt hieu suit cao d ndng do 10%
dugc tay frang theo quy trinh nhieu cdng doan, cd nia bdt giiia cac cdng doan. Dieu kien ciia mdi cong doan dugc lua chgn theo muc tieu cua timg thyc nghiem (cac thdng so cong nghe cua cac cdng doan tay (bang 1) dugc xac dinli qua cac thi nghiem tham do).
he cac cong doan tay trang Cong doan
tav trang
Nong do hot, %
Muc diing hoa chat so voi nguyen lieu kho tuyet doi
(KTB)
Thdi gian tay, phiit
Nhiet do tav, C
pH ban dau
HCNaClOi l h - 2 h - 3 h
- 4h - 5h 45 P CH^O;)
fSa.SiO, 3%) 10 10 10
3%
4"'o 5"o
60.90.120 60.90.120 60.90.120
10
Sau khi ket thiic tay frang. bgt giay d u g c phan tich de xac dinh do trang va cac tinh chat CO hgc theo cac p h u a n g phap cua tieu chuan SC.AXvaTCX'X:
Do chat: TCX'N 3652 : 200"; Chi so keo:
ICNS 1862-1 : 2000; Chi so xe: T C \ ' N 3229 : 200:": Chi sd buc: TCX'N ' 6 3 1 : 2007; Do fring: T C \ ^ ' 1865 : 2007; Do nhdt: SCAN C15:62.
m. KET QUA NGHIEN CLi. TH40 LEAN
3.1. Tinh chat c o ban cua hot chira tay trang Xac dinh tinh chat cua bgt hieu s u i t cao tir nauven lieu co \ ' o i lai \ ' a 0 6 :
Hieu suit bdt: 65.7%:
Tri so Kappa: 27.78;
- D o trang ban dau: 31,15 % ISO;
- Do tro: 2 . 8 " °-o.
\"di nguyen lieu la co Voi lai Va06 la loai thyc vat than thao. bgt giay hieu suat cao tao bdi loai nguyen lieu nay co ham lugng lignin tuong doi cao the hien d gia tri cua tri so Kappa dat 27.78° o. Do trang ban dau ciia bot thap. vdi loai bgt nay muon su dung lam nguyen lieu de san xuat giay in giay viet can thiet phai nang cao do trang.
3.2. Tay trang giai doan 1- sir dung NaCIO
Thai gian xu ly fh)
Hinh 1. .\nh hudng cua thoi gian ta> tring bing NaCIO den do tring cua hot giav
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Tu sa do hinh 1 ta thay khi sir dyng NaCIO cho giai doan diu cua qua trinh tiy trang do tting cua bdt giiy chua tang cao, mtic dat cao nhit d thdi gian xii ly 5h chi la 53,1 % ISO.
NaCIO la hda chit cd tinh khii, cd kha nang phan ling phin hiiy lignin tuy nhien tinh chit khil ctia tic nhan CIO' chua dii manh de phan hiiy hoan toan lugng lignin frong bdt giiy.
Kit qua xac dinh tri sd kappa ciia bdt sau khi tiy fring giai doan dau dat 9,7 giam dang
k l so vdi tri sd kappa ciia bdt chua t i y frang tuy nhien vdi gia tri nay ciing cho thay ham lugng lignin cdn lai frong bdt qua giai doan diu ctia qua trinh tiy vin cdn tucmg ddi cao.
3.3. T i y trSng giai doan 2 sir dung H2O2 vol cac cap nong do Idiac nhau
Bang each thay ddi miic dung H2O2 va thdi gian tiy fring, da thiit lap dugc anh hudng ciia cac yeu td cdng nghe nay tdi do trang ciia bgt (hinh 2).
2h 3b 4h
Thai gian tay trang (h)
Hinh 2. Anh huong ciia thtri gian va nong do H2O2 den do trang ciia bot giay Cac ket qua nghien ctru cho thay, d giai
doan 2, do trang ciia bdt tang manh khi miic dung H2O2 va thdi gian tiy tang, tuy nhien sau thdi gian 4h va miic dimg H2O2 ldn hon 4%, sy thay ddi nay khdng rd ret, vdi miic dimg H2O2 cao nhit la 5% va thdi gian xii ly liu nhat la 5h thi do fring cua bdt dat 78,1% ISO. Cd thi dat do frang cao hon neu tang nhiet do tiy tuy
2.5
nhien nhiet do qua cao se anh hudng den tinh chit ca ly cua xa sgi.
3.3. Xac dinh trj so Kappa ciia bgt sau khi tay trang
Tri sd kappa la mdt frong cac chi tieu danli gia chit lugng bdt sau khi tiy trang, ket qua xac dinh tri sd kappa ciia bdt sau khi tiy frang giai doan 2 (H) the hien tren hinh 3.
*--,.
- • : ? • • • 3%A 4 %
• 5%
2h 3h ^ 4h
Thai gian lay trang (h)
108
Hinh 3. .\nh hudng ciia cac yeu to cong nghe den tri so kappa ciia bot TAP CHI KHOA HOC VA CONG NGHE LAM NGHIEP SO 2-2016
Cd the thay ro tac ddng cua cac hda chat tay trang den thanh phan lignin cd frong bdt hieu suit cao til nguyen lieu cd Voi lai Va06 the hien bdi miic do giam cua trj so kappa qua cac cdng doan tiy. So vdi gia trj cua tri sd kappa cua bgt sau giai doan tiy vdi NaCIO thi thiy rd sy tac dgng ciia H2O2 vao thanh phan lignin
cdn lai frong bdt giay. Vdi cac cap ndng do hda chit H2O2 thay doi la 3%, 4%, 5% thi tri sd kappa giam dang ke, Gia trj giam thap nhat cd the dat dugc khoang 1,5 - 1,6 vdi ca ba muc diing ndng do hda chit sau thdi gian xir ky la 4h.
3.4. Tinh chat ciia bot giay sau tay trang Bang 2. Mgt so chi tieu chat Ivgng co ban cua hot sau tay trang
(Do nghien 45°SR, dinh lugng mau giay 70g/m") Chi so
Bot giiy tay trang tbinmg pham tir nguyen lieu go (nha may giay Bai Bang)
Bdt giay tay trSng tv nguyen lieu CO Voi lai Va06 Do chat, (kg/m )
(TCVN 3652 :2007) Chi sd keo, ( KN.m/g) (TCVN 1862-1 :2000) Chi sd xe, (mN.m^/g) (TCVN 3229 :2007) Chisdbuc,(KPa.m^/g) (TCVN 7631 :2007) Do tring, (%lSO) (TCVN 1865: 2007) Do nhdt, (cm^/g) (SCAN C15:62)
682 55,4 4,8 3,49 82,5 623
675 52,4 4,7 3,47 78,1 603 Qua cac ket qua phan tich bang 2 cho thiy
tinh chat cua bdt hieu suit cao tao til nguyen Ueu cd Voi lai Va06 cd kha nang tay trang tdt ddi vdi cac hda chit tiy thdng dung. Mdt sd tinh chat ca hgc ciia bdt sau tay frang so vdi bdt giiy tay trang sin xuat tir nguyen lieu gd cd thip han (bang 2), tuy nhien miic do giim
khdng nhieu, dac biet l i gin tuang duong nhu cac chi sd ve do buc, do keo va do xe. Nhiing tinh chit ca ly nay ciia bdt giay mdt lan nira dugc khang dinh khi quan sat hinh anh ciia sa sgi bdt sau tiy frang qua kitih hien vi dien tu quet (SEM) (hinh 4).
Hinh 4. Hinh anh so soi bgt giay sau khi tiy tring
Cong nghiep rimg TV. KET LUAN
Ttr cac kit qua nghien ciiu cd the dua ra cac ket luan sau:
- Cd thi su dung hda chit NaCIO va H2O2 dl thiit lap quy trinh tiy fring bdt giiy hieu suit cao tir nguyen lieu cd Voi lai Va06, do fring ciia bdt giiy dugc cai thien rd nhat sau giai doan 2 ciia qua trinh tiy va dat 78% ISO.
- Da lya chgn dugc cac thdng sd cdng nghe tiy fring 2 giai doan doi vdi bdt giiy hieu suit cao tir nguyen lieu cd Voi lai Va06 nhu sau:
Giai doan diu (H):
Mirc diing NaCIO: 5% so vdri bot kho tuyet ddi, thdi gian toy 4h, nhiet do tdy 4S'C, duy tri moi truong pH Id moi trucmg kiem.
Giai doan hai (P):
Muc diing H2O2: 3% - 4%, NaiSiOs: 3% so vol bpt kho tuyet doi, thdi gian tdy 4h, nhiet dp tdy 8(fC.
Mdt sd tmh chit ciia bdt giiy tir nguyen heu cd Voi lai Va06 sau tiy frang so vdi bdt gd khdng cd sy khac biet qua ldn, diy la mdt frong lihiing tieu chi de chgn lya nguyen lieu cd Voi lai Va06 cho sin xuit bdt giiy hieu suit cao.
TAI LIEU THAM KHAO
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ViedHUK dm eysoe. C776.: COeHTA, 1999, 628c.
(Tiang Nga: Azarov V. I., Burov A. V., Obolenskaya A.
V. (1999) Hoa hpc go va cac polime tong hpp, giao frinh dai hpc, Nxb. Hpc vien Ky thuit Lim nghiep Quoc gia Xanh-Petecbua, 629 fr).
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5-9.
3. Katri Saijonkari-Pahkala (2001). Non-wood plants as raw materials for pulp and paper. University of Helsinki, 2001. lOlps.
4. M. Sarwar JAHAN, Z. Z. LEE, Yongcan JIN.
(2006). Oragnic Acid Pulping of Rice Straw. I: Cooking.
Turk J Agric For, N 30, p.231-239.
5. Pulping process for com stover and other nonwoodfibrous materials (WO/2001/016423).
6. Papermaking Science and Technology. Book 1-10.
TAPPI Press, Fapet Oy 2000.
7. TexHOjioeux i^ejuiiojiosHO-dyMaoicHOBo npoiaeodcmea (CnpaeoHHbie Mamepuajiw). T. 1 .Hacn.
1,2. nojnrrexHHKa, CHS, 2001-2003.
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BLEACHING POSSIBLYTY OF fflGH YIELD PULPING FROM MATERIAL VARISME N° 6 (VA06)
Nguyen Thi Minh Nguyet SUMMARY
This paper presents the results of research on the ability of pulp bleaching performance fi'om hybrid materials V.^06 elephant grass. Reseai'ch used experimental methods in manufacturing technology standard paper and pulp, using ISO and SCAN standards to analyze and assess the quality of the pulp after bleaching. Using Sodium hypochlorite is to bleach chemicals and peroxide bleaching technology vvith 2 stages (H-P). the whiteness of pulp has changed markedly. With tbe use of 5% NaOCl temperature in 45°C whiteness bleaching pulpr at the end of phase 1 has reached 53% ISO. The termination of the phase 2 with bleaching mode used bleach concentration of 3 - 4°/o. temperature SO'C. which was obtained bleaching pulp 78% ISO whiteness. The research results are one of the basis for selecting of hybrid materials VA06 elephant grass as raw materials for producing qualified pulp.
Keywords: Bleach, elephant grass, pulp, whiteness.
Ngircri phan bien Ngay nhan bai Ngay phan bien Ngay quyet dinh dang
PGS.TS. Cao Quoc An 12/3/2016
15/3/2016 22/3/2016
