共查询到17条相似文献,搜索用时 93 毫秒
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简述了高得率化学机械浆发展过程和优势。论述了典型高得率化学机械浆的主要原料及其特性、主要生产工艺和过程、漂白以及应用等内容,简要介绍了高得率化学机械浆的主要性能和使用时对湿部的影响。 相似文献
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草类高得率浆漂白技术的研究 总被引:1,自引:0,他引:1
一、前言 以草类原料为主的非木材纤维原料是我国的主要造纸原料,由于长期以来,各国在科研方面重视不够,致使草类的制浆造纸工艺一直没有很大的改进。目前用于生产漂白用纸的草类原料制浆方法基本上限于化学制浆的范围内, 相似文献
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自行开发和研制的高速洗浆机,采用全封闭式结构,不锈钢外壳,自动化程度高,洗浆效率高,可代替盘式浓缩机和斜螺旋浓缩机用于废纸浆的洗涤和浓缩. 相似文献
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Effect of extraction conditions on the yield, purity and surface properties of sugar beet pulp pectin extracts 总被引:5,自引:0,他引:5
The extraction of pectins from sugar beet pulp was carried out in an aqueous acid medium under different conditions using a full two-state experimental design for three extraction parameters (pH, temperature and time). The yields of the extracted pectins ranged from 4.1% to 16.2%. Their contents in pectin constituents were 35.2–76.3% galacturonic acid, 6.8–32.9% neutral sugars, 2.0–4.2% methoxy groups, 0.8–3.8% acetyl groups, and 0.1–0.7% ferulic acid. Moreover, protein residues were present in all the extracts within the range of 0.9–6.8% and varied with the extraction conditions. On high performance size exclusion chromatography, the elution pattern of the acid-extracted pectins showed a wide molar mass distribution consisted of two relatively broad peaks. Their weight-average molar mass values determined by HPSEC-RALLS ranged widely from 20,200 to 90,100 g/mol. Most of the extracted pectins were surface-active, and some of them were quite able to produce and stabilize with effectiveness oil-in-water emulsions. Thus, it was inferred that yield, physico-chemical characteristics and surface properties of acid extracted pectins from sugar beet pulp were influenced by the extraction conditions. 相似文献
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