共查询到18条相似文献,搜索用时 234 毫秒
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《江苏化工》2000,(11)
甘露醇在医药工业中的应用前景 甘露醇在医药工业中有极广泛的用途。 (1)作片剂的填充剂 ; (2)作直接压片的赋形剂和咀嚼片的矫味剂 ; (3)作为冻干针剂的载体 ; (4)作为降压剂、利尿剂、脱水剂 ; (5)制硝甘露醇的原料 ; (6)制甘露醇烟酸酯的原料 ; (7)制二溴甘露糖醇的原料。目前,世界上甘露醇的总生产能力约为 1.7万 t/a,其中美国的消费量最大为 8 000 t/a, 日本为 1 000 t/a,国外生产厂家主要有美国的 ICI Americas.INC、芬兰的 Sokerikemia.Oy、荷兰的 Cheime Coluba Ratic Co.公司、巴西的 Getec.Co.公司、日本协和发… 相似文献
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《化学工业与工程技术》2000,21(2)
葡萄糖差向异构制甘露醇新工艺 ,已由广西南宁市化工研究设计院研制成功 ,并于日前通过了技术鉴定。该工艺是利用差向异构技术 ,将葡萄糖异构转化为甘露糖 ,再还原制取甘露醇。转化率和成品收率均比用蔗糖生产工艺提高 2 5%以上 ,且产品质量符合国家标准。该项目的研制成功 ,扩大了生产甘露醇的原料来源 ,提高了产品收率。且能根据市场情况自由选择原料 ,增强了产品对市场的应变和竞争能力葡萄糖差向异构制甘露醇新工艺研制成功 相似文献
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结晶甘露醇和山梨醇溶液的制备研究 总被引:4,自引:0,他引:4
对蔗糖直接合成山梨醇和甘露醇以及甘露醇的结晶分离进行了研究。在含Ni,Al,R的载体催化剂存在下,中性的蔗糖水溶液可同时水解加氢直接转化为甘露醇和山梨醇溶液。产物中甘露醇和山梨醇和质量比约为1:4。产物的水溶液结缩至已糖醇的质量分数为73%,然后在58℃时以3℃/h的速率冷却至29℃使某露醇部分结晶。浓缩液中的甘露醇有70%结晶出来。结晶母液中,山梨醇和甘露醇的质量分数分别为65.1%和4.9%。 相似文献
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《中国石油和化工标准与质量》2017,(24):29-30
作为PVC树脂生产的主要原料,设法降低电石消耗属于降低PVC生产成本的最直接也最关键措施,基于此,本文就电石贮存环节、乙炔发生环节、合成气转化环节的PVC生产降低电石消耗措施进行了详细论述,希望由此能够为相关业内人士带来一定启发。 相似文献
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硼酸是一种多元弱酸,不能由氢氧化钠标准溶液直接滴定。在甘露醇、丙三醇等强化剂的作用下,硼酸能与其定量生成一种酸性更强的络合酸,可以由氢氧化钠直接滴定。通过最低pH值法和最大耗碱量法的比较发现,甘露醇对硼酸的强化效果优于丙三醇,能够实现对0.10mol/L硼酸溶液的准确滴定。在最优的甘露醇加入量(n(C6H14O6)∶n(H3BO3)=4∶1)时,甘露醇对不同浓度硼酸的强化效果相差不大,都能实现准确滴定。将该成果推广应用于HCl和H3BO3的混合酸的滴定,取得了理想的结果。 相似文献
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蔗糖电化学还原合成甘露醇、山梨醇的研究 总被引:6,自引:0,他引:6
用蔗糖作原料,经水解生成转化糖(等量的葡萄糖和果糖),再经钼酸铵转化成葡萄糖、果糖、甘露糖的混合物。RaneyNi粉电极做阴极,DSA(钌/钛)电极做阳极在隔膜电解槽中电解还原制取甘露醇、山梨醇,考察了pH、电流密度、总糖浓度、温度和通电量等因素对电解还原反应的影响,确定了最佳工艺条件为:总糖浓度0 50mol/L、电流密度3 0A/dm2、pH=9、θ=35℃、通电量1 3F/mol。转化率可达84%,总醇中甘露醇质量分数为46%。在阴极同时得到两种产品(甘露醇和山梨醇),甘露醇含量显著地增加。 相似文献
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This is the first report on ligand-assisted assembly of BiOBr. BiOBr, using cetylpyridinium bromide (CPB) as Br source and surface template, was prepared with water with the presence of three polyhydroxyl alcohols. Based on SEM, HR-TEM and XRD, mannitol results in different particle morphologies. Rather than smooth microspheres, projections form that double surface area. BiOBr prepared in mannitol displayed the highest photocatalytic activity and tripled the oxygen consumption rate compared to the other preparations. The Bi3 +–mannitol complex competes with hydroxide for Bi3 + in the CPB micelles and limits the availability of BiO+, altering the assembly process. A four-step mechanism for ligand-assisted assembly of BiOBr in mannitol is proposed. 相似文献
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The polymorphism of D-Mannitol(mannitol) is reviewed in this paper. It was found that the structure of the stable form is consistent in most literatures, but different authors have given different information about the two metastable forms. Therefore the commonly used nomenclature of mannitol was summarized based on the crystal unit cell parameters with the help of X-ray powder diffraction. Moreover, the crystal growth mechanism of mannitol polymorphs was summarized. Considering the lack of kinetic data for the metastable form especially, a reported method was attempted to apply to δ mannitol in an aqueous cooling crystallization process based on the induction time previously measured, and it was identified that the growth of the δ form follows the two-dimensional(2D) nucleationmediated mechanism. The results also indicate that the method based on induction time and supersaturation should have the potential to be expanded to the metastable polymorphs for the growth property study in a bulk system. 相似文献
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A boric acid bath for ZnNi alloy electrodeposition was developed with mannitol as additive. The deposition process was investigated
by cyclic voltammetry. It was found that the current density decreased, due to adsorption of a boric–mannitol complex and/or
changes in the morphology, but the initial deposition potential was not affected. At deposition potentials more negative than
−1.20 V, the current efficiency obtained was high (80–85%) in all baths studied. The addition of mannitol to the bath led
to the formation of the best ZnNi deposits, composed of coalesced globular grains smaller than ~1 μm in diameter. Also, all
of the ZnNi deposits studied consisted of γ, γ1, and Pt3Zn phases. The Ni content in the ZnNi deposits produced in the presence of mannitol increased from 6 to 10 wt% only in the
range −1.26 to −1.40 V. It is suggested that the ZnNi deposits produced in these baths probably offer sacrificial protection
to the substrate. 相似文献
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为解决20%甘露醇注射液低温下易结晶的问题,对其配制工艺进行优化。采用加入复合溶剂的方法,通过正交试验,对聚乙二醇含量、水浴温度及pH值三因素进行考察,观察溶液在5℃条件下5 d内的溶解状况,并测定甘露醇含量。 相似文献