共查询到20条相似文献,搜索用时 328 毫秒
1.
2.
3.
4.
通过对氨苄西林钠各种生产工艺进行分析比较,对影响澄清度稳定性的因素进行了推断,进而开发了乙腈溶媒结晶新工艺,并对乙腈溶媒结晶工艺各操作条件的变化对产品质量及收率的影响进行了系统研究,最后对乙腈工艺进行了优化. 相似文献
5.
6.
7.
浅议我国功能性纺织品开发现状及发展趋势 总被引:1,自引:0,他引:1
对我国功能性纺织品的分类及开发现状进行了介绍,对功能性纺织品的制备方法进行了阐述,对功能性纺织品的最新进展及其发展趋势进行了展望。 相似文献
8.
9.
10.
11.
12.
13.
14.
Vivek S. Vadke F. W. Sosulski C. A. Shook 《Journal of the American Oil Chemists' Society》1988,65(10):1610-1616
A mathematical model of an oilseed press was developed by superimposition of filtration analysis on screw extrusion theory to calculate press throughput and residual oil content in presscake for a given press geometry and physical properties of oilseed. The model predicted that press performance would improve, i.e., the throughput would increase and residual oil would decrease, if the press were cooled during operation. Longer presses would also give higher throughputs with lower residual oil contents. The predicted effects of changes in shaft speed and choke opening on press performance agreed reasonably well with experimental results obtained on a small laboratory press. A relatively large error of 9.0% in the prediction of throughput could be attributed to changes in viscosity of oilseed mass occurring during its passage through the press. It is expected that use of ‘expression’ analysis in place of the simple filtration analysis would improve the predictive ability of the model. 相似文献
15.
使用Moldflow MPI/Injection-compression模块对薄壁塑件顺序注射压缩成型工艺进行了仿真,采用单因素试验研究了熔体温度、模具温度、延迟时间、压缩距离、压缩速度、压缩压力和保压压力对脱模后热残余应力的影响。仿真结果表明,顺序注射压缩成型薄壁制件热残余应力分布规律与常规注射成型相似,但是前者热残余应力较小且沿流动方向更为均匀;热残余应力随熔体温度、模具温度、压缩距离、压缩速度的增加而减小,随延迟时间和保压压力的增加而增大;压缩压力大于熔体流动阻力后,继续增大压缩力对热残余应力无影响。 相似文献
16.
应用REV尺度的格子Boltzmann方法模拟了树脂沿轻质毡厚度方向的流动过程,考察了加压方式、载荷、温度、双钢带压机结构等对浸渍的影响,为浸渍速度和浸渍时间的预测提供了一种新方法。结果表明:与平板压机相比,双钢带压机通过施加高低交替的压力更能有效地浸渍轻质毡,缩短浸渍时间。另外发现,浸渍不仅与树脂最大浸渍速度有关,还取决于片材在高压区的停留时间。通过增加载荷或升高温度均可提高树脂最大速度,而片材在高压区的停留时间则对压机辊柱直径及载荷更为敏感,仅依靠调节钢带运行速度不能达到缩短浸渍时间的目的。 相似文献
17.
立式压滤机是固液分离领域的重要设备之一,其主要特点是自动化程度高,滤布再生能力强,应用领域广。列举了立式压滤机的应用情况,并通过对立式压滤机与卧式压滤机的比较,提出了立式压滤机应用于大型铀矿山的设想,从而实现减少设备占地面积、降低滤渣含水率、提高自动化程度、降低劳动强度等卧式压滤机无法实现的效果。 相似文献
18.
S. Isobe F. Zuber K. Uemura A. Noguchi 《Journal of the American Oil Chemists' Society》1992,69(9):884-889
Transport of material in a single-screw press depends mainly on friction between the material and the barrel’s inner surface
and the screw surface during screw rotation. Thus, a solid core component, like seed hulls, is often necessary to produce
the fraction. This sometimes causes excess frictional heat, large energy consumption and oil deterioration. Furthermore, if
single-screw presses are not configured with breaker bars or other special equipment, they provide inadequate crushing and
mixing.
A twin-screw oil press can be expected to solve these problems because of the higher transportation force, similar to a gear
pump, and better mixing and crushing at the twin-screw interface. A twin-screw press (screw diameter=136 mm, length/diameter=6.5,
screw speed 15–100 rpm, feed rate=50–150 kg/h) was designed with partially intermeshing and counter-rotating screws and was
tested on dehulled sunflower seed. The results were compared to a single-screw lab-scale press. Dehulled sun-flower seed (wt,
6.0%; oil, 58.6%) without pretreatments (crushing or cooking) gave 93.6% oil recovery with the twin-screw press, in contrast
to 20% oil recovery with the single-screw press. The oil expressed with a twin-screw press had less foreign material than
the oil from the single-screw press. Other properties of the oil were also good. Energy consumption of the twin-screw press
was more efficient. All results suggested that oil production from dehulled sunflower seed with a twin-screw press is highly
efficient. 相似文献
19.
20.
可溶性淀粉-乙二醛对棉织物免烫整理的研究 总被引:1,自引:0,他引:1
本文对可溶性淀粉-乙二醛用于棉织物免烫整理的整理工艺进行了研究.结果表明:用可溶性淀粉-乙二醛对棉织物进行免烫整理,其效果优于树脂整理和其它低醛或无醛免烫整理,整理工艺简单,原料来源方便,没有环境污染,整理过的织物符合人体卫生要求,耐洗性好,是一种具有市场开发价值的免烫整理技术,值得推广应用. 相似文献