共查询到12条相似文献,搜索用时 93 毫秒
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采用絮凝法对味精发酵生产过程中发酵液中的菌体进行研究,得到无机凝聚剂与高分子絮凝剂复合配比使用是发酵液去除菌体的有效办法。对复合用药除菌后的谷氨酸发酵液和原谷氨酸发酵液进行谷氨酸回收的比较,谷氨酸的回收率提高了8.8%。 相似文献
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分析了盐酸、硫酸贮罐破裂发生泄漏事故的危害,对泄漏事故采用事故数学模型作了系统的计算分析,得出了泄漏危害的范围,并提出了防范和控制泄漏事故的安全措施. 相似文献
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论述了提高液晶电焊防护片响应速度的办法,经试验,发现电焊电流产生超前电焊光的时间是13ms。因此可用电焊电流作为触发信号提前开启液晶偏转电路以达到全过程防护的目的。 相似文献
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本文对不同工艺生产的煤质活性炭进行了腐殖酸吸附性能动态和静态试验研究。结果表明:不同工艺生产的煤质活性炭腐殖酸吸附值(动态)有较大差异,柱状炭0.16mg/g左右,破碎炭0.40~0.63mg/g.其中压块破碎炭为最高;静态吸附条件下,腐殖酸吸附率差异不大,各类炭均大于70%。 相似文献
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Jolanta Liwkowicz Joanna Kowalska 《International journal of occupational safety and ergonomics》2013,19(1):81-88
Because they cause burns that are difficult to heal, acids are dangerous, and steps should be taken to ensure that the human skin does not come into contact with them. For this purpose safety gloves are generally used by workers who have to handle acids. Such gloves need to be tested to ensure that they are acid resistant. Standard EN 374 (European Committee for Standardization [CEN], 1993c) specifies a method of testing the permeation of liquid chemicals, on a molecular level, through glove material, but it may be difficult to ensure the fitness of the joints of a two-compartment cell, when gloves are lined with jersey. To deal with this a simple pH-meter method to test the permeation of acid and alkali solutions through safety gloves has been developed. The permeation of H2S04, HCI, HN03, and CH3COOH through gloves made from neoprene, nitrile, and PVC was tested. This method seems to be simple and economical. 相似文献
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柠檬酸对膨润土吸附镍离子的影响研究 总被引:1,自引:0,他引:1
采用平衡吸附法,研究了柠檬酸对膨润土吸附镍离子的影响.吸附结果表明,当Ni2 初始质量浓度为30 mg/L时,振荡反应90 min,介质pH为5,投加量为5 g/L时,膨润土对Ni2 显示了较好的吸附性能.动力学研究表明该吸附过程符合Lagergren二级动力学模型,等温吸附实验表明其吸附行为符合Freundlich模型.离子强度增大及柠檬酸存在时,会降低其吸附能力.解吸实验发现,通过柠檬酸间接与膨润土结合的Ni2 结合牢固程度较差,更易解吸出来.表明柠檬酸的存在对镍离子的吸附有抑制作用. 相似文献