本文關(guān)鍵詞： 氫氧化鎂 堿性過氧化氫機械漿 紙漿性能 纖維質(zhì)量分析　出處：《山東輕工業(yè)學(xué)院》2010年碩士論文　論文類型：學(xué)位論文

【摘要】： 在傳統(tǒng)的楊木APMP制漿中,原料的堿性H2O2預(yù)處理所需要的堿性條件一般由加入的NaOH提供,NaOH的強堿性容易引起碳水化合物的部分降解,降低了得率,降解產(chǎn)物進入廢液增加了預(yù)處理流出液中COD的含量,增加了污染負(fù)荷,而Mg(OH)2的弱堿性,可以彌補鈉堿的上述缺陷,因而采用Mg(OH)2的楊木APMP制漿技術(shù)受到關(guān)注。 本論文主要進行了Mg(OH)2為堿源或部分堿源的楊木APMP制漿及其機理的研究,包括單段預(yù)處理和兩段預(yù)處理制漿工藝及對楊木單段預(yù)處理鎂堿APMP制漿工藝參數(shù)的探討。同時利用FQA、ESEM、XPS等分析手段對鎂堿楊木APMP漿的纖維特性進行了研究。 首先,鎂堿作為堿源時,楊木單段預(yù)處理APMP制漿時較為適宜的化學(xué)預(yù)處理條件為:H2O2:5.0-6.0%,Mg(OH)2:4.35%,Na2SiO3:4.0%,EDTA:0.5%,液比:4:1,反應(yīng)溫度70-80℃,反應(yīng)時間90 min。在該工藝條件下,當(dāng)打漿度為450SR時,可得到白度為67.5-68.4%ISO,不透明度91.1%,光散射系數(shù)為47.65 m2·kg-1的漿料,但漿的強度較差,裂斷長僅為1.32 km,撕裂指數(shù)僅為1.63 mN·m2·g-1。 其次,通過對氫氧化鎂部分或全部取代氫氧化鈉的楊木APMP制漿的研究,發(fā)現(xiàn),隨著Mg(OH)2取代NaOH的量的增加,紙張的物理強度和白度下降,但不透明度、松厚度和光散射系數(shù)提高。鎂堿部分取代單段楊木APMP制漿的較佳工藝條件為:Mg(OH)2取代量為50%,H2O2:5.0%,Na2SiO3:4.0%,EDTA:0.5%,液比:4:1,反應(yīng)時間80 min;兩段楊木APMP制漿的較佳工藝條件為:第一段全用氫氧化鈉,第二段Mg(OH)2取代量為50%。在該工藝條件下,可得到白度為71.9%ISO,裂斷長為3.76 km,撕裂指數(shù)為4.53 mN·m2·g-1,不透明度83.3%,光散射系數(shù)為42.52 m2·kg-1的漿料。與此同時,采用Mg(OH)2的楊木APMP制漿可以有效降低廢水COD含量。隨著氫氧化鎂取代量的增加,制漿廢液中的COD含量下降,從而更有利于實現(xiàn)清潔生產(chǎn)。在相同OH-用量的情況下,隨著氫氧化鎂取代量的增加,紙漿中木素、碳水化合物和有機溶劑抽出物溶出率均下降。 再次,通過對漿料纖維質(zhì)量分析和紙漿纖維掃描電鏡形貌圖的觀察,發(fā)現(xiàn),隨著Mg(OH)2取代量的增加,所得紙漿纖維的長度加權(quán)平均長度逐漸變短,不論是數(shù)均細(xì)小纖維含量還是長度加權(quán)含量,均表現(xiàn)為隨著Mg(OH)2取代量的增加逐漸增加。 最后,通過對不同鎂堿取代的楊木APMP紙漿纖維表面XPS分析,表明,隨著氫氧化鎂取代量的增加,C1s結(jié)合能下降,C1s峰面積增大,O1S峰面積減少,即O/C比減少,說明,鎂堿楊木APMP漿纖維表面木素含量增加,碳水化合物含量減少;同時通過對丙酮抽提前后的紙漿纖維的XPS對比分析,丙酮抽提后的O/C比增加,降低了纖維表面木素等疏水性物質(zhì)的含量。 鎂堿APMP漿料其強度性能較差的原因主要有以下幾點:①鎂堿的弱堿性以及Mg2+在纖維表面的吸附,使得纖維的潤脹度差,纖維柔韌度下降,從而使磨漿進程中,纖維切斷較多,纖維平均長度較短,細(xì)小纖維含量較高;②鎂堿的弱堿性使得纖維表面木素溶出較少,況且纖維表面的疏水性物質(zhì)含量增加,阻礙了纖維與纖維之間的聯(lián)接與結(jié)合。
[Abstract]:In the traditional APMP pulping of poplar in alkaline conditions to H2O2 alkaline pretreatment of the raw materials is usually provided by the addition of NaOH, NaOH basic is easy to cause degradation of carbohydrates, reducing the yield rate, degradation products into the waste pretreatment effluent increased the content of COD, increase the pollution load, and Mg (OH) alkaline 2, these can make up the defects of sodium alkali, so using Mg (OH) 2 poplar APMP pulping technology is concerned.
This paper mainly discussed the Mg (OH) 2 as the alkali source or partial alkali source and APMP pulping of poplar and its mechanism, including the single segment pretreatment and two stage pretreatment pulping of poplar and single alkali pretreatment of magnesium APMP pulping process parameters is discussed. At the same time the use of FQA, ESEM, fiber characteristics XPS analysis of magnesium base of Aspen APMP pulp was studied.
First of all, magnesium alkali as the alkali source, poplar single stage pretreatment of APMP pulping is appropriate chemical pretreatment conditions were: H2O2:5.0-6.0%, Mg (OH) 2:4.35%, Na2SiO3:4.0%, EDTA:0.5%, liquid ratio 4:1, reaction temperature 70-80, reaction time 90 min. under these conditions, when the beating degree is 450SR when can get the white degree is 67.5-68.4%ISO, 91.1% opacity, light scattering coefficient is 47.65 m2 / kg-1 slurry, but the poor strength of pulp, the breaking length is 1.32 km, the tear index is only 1.63 mN - M2 - g-1.
Secondly, through the research of magnesium hydroxide, partially or completely replace sodium hydroxide APMP pulping of poplar was found, with Mg (OH) 2 substituted amount of NaOH increased, decreased the physical strength of the paper and whiteness, but the bulk and opacity, light scattering coefficient increased. Magnesium base part used to replace single segment of poplar APMP and the optimum process conditions are as follows: Mg (OH) 2 substituted amount was 50%, H2O2:5.0%, Na2SiO3:4.0%, EDTA:0.5%, liquid ratio 4:1, reaction time 80 min; two poplar APMP pulping the optimum process conditions are as follows: the first section of the whole with sodium hydroxide, second Mg (OH) 2 substituted amount of 50%. in this condition, can get the white degree is 71.9%ISO, the breaking length is 3.76 km, the tear index of 4.53 mN - M2 - g-1, 83.3% opacity, light scattering coefficient is 42.52 m2 / kg-1 slurry. At the same time, using Mg (OH) 2 poplar APMP pulping wastewater can effectively reduce the COD with the substitution amount of magnesium hydroxide content. The increase of COD content in pulping waste liquor decreases, which is more conducive to cleaner production. Under the same OH- dosage, the dissolution rate of lignin, carbohydrates and organic solvent extractives decreased with the increase of magnesium hydroxide substitution.
Again, through the observation on the pulp fiber quality analysis and SEM morphology of pulp fibers found in Mg (OH) 2, with the increase of the amount of substitution, the length weighted average length of the pulp fibers gradually become shorter, regardless of number of small fiber content and length weighted content, were performed with Mg (OH) 2 the increase of the amount of substitution increased.
Finally, through the XPS of poplar APMP pulp fiber surface to replace different magnesium base analysis shows that, with the increasing amount of magnesium hydroxide to replace C1s with C1s, can be decreased, the peak area increased and the peak area of O1S decreased, O/C ratio decreased, shows that the increase of magnesium base of Aspen APMP pulp fiber surface lignin content, carbohydrate content decreased at the same time; based on the comparison between XPS analysis before and after acetone extraction of pulp, acetone extraction after O/C ratio increased, decreased the content of fiber surface lignin and other hydrophobic substances.
The strength of APMP slurry of magnesium alkali poor performance mainly in the following points: 1. Alkaline magnesium alkali and Mg2+ adsorption on the surface of the fiber, so that the differential degree of swelling of fiber, fiber flexibility decreased, so that the grinding process, fiber cut more, the average fiber length is shorter, higher fines content the alkali alkaline magnesium; the fiber surface lignin dissolution and less hydrophobic substances on the surface of the fiber increased, hinder the connection between the fiber and the fiber and binding.

【學(xué)位授予單位】：山東輕工業(yè)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：TS743

【參考文獻】

相關(guān)期刊論文 前10條

1 畢衍金;齊根望;趙淑晶;閆俊欽;金艷彬;顏曉鶯;;FQA纖維質(zhì)量分析儀的應(yīng)用[J];中華紙業(yè);2007年09期

2 王鴻文;;合理利用非木纖維要從木材制漿模式中解脫出來[J];中華紙業(yè);2009年06期

3 ;中國造紙工業(yè)2008年度報告[J];中華紙業(yè);2009年09期

4 索曉紅;王蘅;;我國林紙一體化的現(xiàn)狀及發(fā)展趨勢[J];中華紙業(yè);2009年15期

5 張震宇;;造紙工業(yè)環(huán)境保護現(xiàn)狀、進步與發(fā)展要求[J];中華紙業(yè);2009年19期

6 徐載哲,郝國榮,韓剛;楊木APMP的生產(chǎn)實踐[J];湖南造紙;2001年03期

7 孔凡功,陳嘉川,楊桂花,李昭成,詹懷宇;三倍體毛白楊單段預(yù)處理APMP制漿的研究[J];造紙科學(xué)與技術(shù);2004年01期

8 胡云;;Mg(OH)_2作為纖維素保護劑在壓力堿性過氧化氫(E_(OP))漂白段的應(yīng)用[J];國際造紙;2006年02期

9 黃光春,牛梅紅,張運展;淺談APMP制漿技術(shù)[J];黑龍江造紙;2002年01期

10 姚光裕;;過氧化物漂白機械漿過程中用氫氧化鎂代替氫氧化鈉以降低草酸鈣結(jié)垢[J];黑龍江造紙;2007年01期

，

本文編號：1462436