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产高低温盐加水溶解,除杂质后再与泡花碱等进行复分解反应,经分离、干燥制得医药级三硅酸镁,产品质量达到中药典(二部)标准;母液经冷冻法制取光无水硫酸钠,产品质量达到GB6009-92一级品标准。 相似文献
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本文综述了从蛋黄中分离水溶性浆蛋白的工艺方法,水溶性组份中IgY在pH5.0-5.2经6倍水稀释后培养的6h,其回收率达93-96%,其中pH值是影响IgY回收率的最重要因素,高回收率的活性高纯IgY可通过盐沉淀,乙醇沉淀,超滤,凝胶过滤和离子交换色谱法等分离技术制得,盐沉淀,超滤和凝胶过滤是一种值得广泛应用的方法,通常1个鸡蛋可制得电泳纯IgY100mg左右。 相似文献
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以内蒙古自治区丰富的葵花籽油为原料,采用甲醇改性,将改性油与乙醇胺进行酰胺化反应,而后与磷酸化试剂进行磷酸化反应,中和,制得新型表面活性剂—葵花籽油烷醇酰胺磷酸酯盐。通过单因素试验和正交试验法,确定了各步的最佳工艺参数。然后,将制得的烷醇酰胺磷酸酯盐表面活性剂再辅以其它助剂,制取了一种具有优良加脂性能的复合型磷酸酯类皮革加脂剂,并对加脂后革的理化指标进行检测,结果证明:加脂后革的抗张强度和断裂负荷伸长率,都优于复配组分中加脂性能较好的亚硫酸化蓖麻油处理后的革,而且符合标准(QB/T 1872—2004)值。 相似文献
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羧甲基壳聚糖的制备研究 总被引:7,自引:0,他引:7
探索壳聚糖水溶性衍生物——羧甲基壳聚糖的制备方法。将壳聚糖在乙醇中浸泡数小时,然后用50%氢氧化钠碱化,制得碱化壳聚糖。把氯乙酸加入碱化壳聚糖中,在45~50℃搅拌反应4小时,粗产品用乙醇提纯,得到白色片状羧甲基壳聚糖,产率97.1%。 相似文献
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将高低温盐加水溶解,除杂质后再与泡花碱等进行复分解反应,经分离、干燥制得医药级三硅酸镁,产品质量达到中药典(二部)标准;母液经冷冻法制取无水硫酸钠,产品质量达到GB6009-92一级品标准. 相似文献
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按苏联国标5982—75采用亚硫酸盐法制得的纤维素浆,经电离辐射(r射线、加速电子)改性后,可提高所制粘胶的反应性能。因此射辐改性纤维素浆所制得粘胶的过滤性能要比普通粘胶提高0.5~1倍。本文研究浆制得粘胶的某些主要 相似文献
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内蒙古兰太实业股份有限公司兰峰分公司生产产品主要有甲醇钠和原甲酸三甲脂,这两种产品生产过程中都产生尾气,尾气的主要成分是氢气和甲醇气体,由于甲醇气体为有毒有害气体,排放到大气中后会对环境造成污染,因此为了响应国家节能减排号召,对氢气中的甲醇进行阻截吸附,通过前期的实验,确定了吸附工艺——活性炭吸附工艺,此工艺原理为来自甲醇钠(原甲酸三甲脂)车间的含甲醇排空氢气,自吸附塔下部进入塔内,含甲醇氢气被第一层活性炭吸附,再进入第二层活性炭二次吸附,使甲醇被活性炭吸附,达到环评报告排放要求61.63 mg/m3,再通过管道阻火器后排空。经过此次改造,兰峰分公司甲醇钠和原甲酸三甲脂产生的尾气实现了达标排放,改善了环境,取得了良好的社会效益,同时为节能减排工作做出了很大的贡献。 相似文献
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二氧化氯溶液制备工艺的研究 总被引:1,自引:0,他引:1
二氧化氯是新一代环保安全高效消毒剂,同时也是优良的水处理剂、漂白剂、食品保鲜剂、防腐剂、除臭剂。稳定二氧化氯溶液因具有不挥发、不易燃、易储存的特点而备受青睐。探索了氯酸钠-甲醇-硫酸法制备稳定二氧化氯溶液的制取方法、工艺流程,通过正交试验研究了氯酸钠浓度、硫酸用量、甲醇用量及反应温度对二氧化氯收率的影响,确定了优化组合为:氯酸钠浓度为4.0mol/L、硫酸用量以硫酸与氯酸钠摩尔比计为2.0、甲醇用量以甲醇与氯酸钠摩尔比计为0.16、反应温度55℃,反应生成的气体用食品级碳酸盐水溶液吸收,二氧化氯收率达到88.9%,产品达到食品添加剂标准。 相似文献
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食品添加剂——D-异抗坏血酸钠生产工艺的研究 总被引:8,自引:0,他引:8
生产食品添加剂——D—异抗坏血酸钠一般采用间接发酵法,即先由细菌发酵D—葡萄糖产生2—酮基—D—葡萄糖酸(或钙盐),再经化学转化而成。原工艺是先提取出2—酮基—D—葡萄糖酸钙,后经硝酸和甲醇酯化。新工艺是用含有2—酮基—D—葡萄糖酸的净化发酵液进行酯化,酯化时加甲醇和硫酸。新工艺比原工艺步骤简化,产品质量和收率提高。D—异抗坏血酸钠对糖的克分子收率达43.1~48.7%。 相似文献
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研究了直接滴定法测定食用油中L-抗坏血酸棕榈酸酯的方法.用甲醇对油样中L-抗坏血酸棕榈酸酯进行提取,对提取物在酸性条件下水解,用水解产物对2,6-二氯酚靛酚钠溶液进行滴定.该方法灵敏性高、准确可靠. 相似文献
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Aazam Aarabi Maryam Mizani Masoud Honarvar Hossein Faghihian Abbas Gerami 《Sensing and Instrumentation for Food Quality and Safety》2016,10(1):42-47
Extraction of ferulic acid from sugar beet pulp was carried out using three extraction solvents, sodium hydroxide (0.5, 1, 2 M), methanol and their mixture (alkaline methanolic solvent). The Ferulic acid extracted by each solvent was identified and quantified by HPLC method and the effects of solvent type, concentration and reaction time on ferulic acid solubilisation were assessed. There were differences in the contents of products extracted in the experiment conditions. The minimum amount of ferulic acid was obtained from methanolic extract while the highest concentrations (957.4 mg/L ferulic acid) were obtained employing the highest NaOH concentration (2 M), and reaction time (12 h), so phenolic compounds are better released with alkaline hydrolysis than in methanol conditions. Finally a simple procedure for the purification of ferulic acid from the alkaline extracts is presented and evaluated by FT-IR spectrum. 相似文献
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Bronopol (2‐bromo‐2‐nitropropane‐1,3‐diol) is used as preservative in cosmetic industry. Its main role in commercial products consists in protection of the cosmetic composition stability by inhibiting the development of micro‐organisms. Unfortunately, preservatives can also undergo the degradation processes. The aim of examinations was to prove that bronopol decomposes in aqueous solutions and storage conditions have a significance influence on its degradation rate. High‐performance liquid chromatography method (methanol/water with hydrochloric acid 5:95 v/v) with spectrophotometric detection (210 nm) was used for examining the decomposition rate of bronopol. The impact of chemical (addition of cosmetics components: citric acid and/or sodium dodecylsulfate) and physical (elevated and ambient temperature, sunlight or ultraviolet radiation and air access) factors has been elaborated. Bronopol decomposes most rapidly (independently on the sample surrounding conditions) when it is in solution with sodium dodecylsulfate, the inverse dependence is observed in the presence of two compounds – citric acid and sodium dodecylsulfate. Additionally, the elevated temperature causes the acceleration of decomposition. Bronopol degradation by‐products were also identified as methanol, formic acid, tris(hydroxymethyl)methane and 2‐bromo‐2‐nitroethanol. 相似文献