真空冷冻干燥鸡蛋粉的实验研究

用电阻法测定了蛋清、蛋黄以及全蛋混合液的共晶点温度，通过对蛋清、蛋黄以及全蛋的多次冻干实验．分析了三种蛋粉的冻干曲线，探索了真空冷冻干燥鸡蛋粉的工艺。     

影响磷酸铵产品质量因素的浅析

分析磷酸浓度、氨用量、中和度、磷酸中的SO3含量、磷石膏带入量、磷酸中的杂质对磷酸铵产品有效养分含量的影响;工艺操作、筛分设备对磷铵物理性状的影响。     

PET产品品质的提升

对20万t/a 4釜流程的PET装置进行全方位调查,分析影响产品品质主要原因为操作人员技能不熟,浆料配制系统有缺陷,酯Ⅰ系统不稳定,预聚物过滤器切换有缺陷,过料不平衡等。并制订相应对策。通过改进,各项参数得到有效地控制,产品品质得到了提高。     

正确认识和运用ISO9002质量体系抓好产品质量

本公司进行了 2 0 0 1年度第 2次ＩＳＯ90 0 2质量体系内审工作 ,通过这次内审 ,我们发现各有关职能部门的日常业务 ,生产活动基本能按体系要素规定的程序和要求进行。同时 ,通过这次审核 ,我们也发现一些不足之处。由于公司质量体系建立的时间较短 ,各有关职能部门对质量体系文件的内容了解贯彻不够彻底 ,致使工作中还有差距。甚至少数员工错误的认为 ,企业通过ＩＳＯ90 0 2国际质量体系标准认证后 ,就可以松一口气了。其实 ,认证的证书和标志 ,只是证明企业的质量体系与国际标准中某个保证模式的一致性 ,不证明企业生产的任何产品都是合格…     

Synthesis methods and powder quality of titanium monocarbide

Titanium monocarbide(TiC),which is the most stable titanium-based carbide,has attracted considerable interest in the fields of energy,catalysis,and structural materials due to its excellent properties.Synthesis of high-quality TiC powders with low cost and high efficiency is crucial for industrial applications;however major challenges face its realization.Herein,the methods for synthesizing TiC powders based on a reaction system are reviewed.This analysis is focused on the underlying mechanisms by which synthesis methods affect the quality of powders.Notably,strategies for improving the synthesis of high-quality powders are analyzed from the perspective of enhancing heat and mass transfer processes.Furthermore,the critical issues,challenges,and development trends of the synthesis technology and application of high-quality TiC powder are discussed.     

Physical and surface characteristics of the mechanically alloyed SiBCN powder

A powder mixture of cubic silicon, hexagonal boron nitride and graphite, with the molar ratio of Si:BN:C=2:1:3, was high-energy ball milled for 40 h, under argon atmosphere. The physical and surface characteristics, the microstructures and the behavior on heating of the as-milled SiBCN powder were carefully studied by SEM, nitrogen adsorption–desorption isotherms, XPS, FT-IR, XRD, TEM and thermogravimetry-differential thermal analysis-mass spectrometry-infrared spectroscopy (TG–DTA-MS-IR). Results show that the as-milled powder is amorphous and mainly consists of near-spherical agglomerates, 6.6±5.3 μm in size deriving from the hard agglomeration of nano-primary particles. The specific surface area, the specific pore volume and the average pore diameter of the powder are 24.5 m²/g, 0.136207 cm³/g and 20.3 nm, respectively. The as-milled powder adsorbs water vapor, CO and CO₂, and it is easy to oxidize. When heated in helium atmosphere, the powder desorbs water vapor, CO and CO₂ at lower temperature, and rapidly degasifies CO and CO₂ at temperatures approximately between 1350 °C and 1500 °C.     

Unusual product ratios resulting from the gamma-irradiation of cholesterol in liposomes

Cholesterol in aqueous suspensions of multilamellar vesicles (MLV) was exposed to gamma-irradiation (0.5–10 kGy) at 0–4°C. Cholesterol oxidation products resulting from the irradiation were isolated by dry column extraction followed by preparative thin-layer chromatography (TLC) and were quantitated by on-column gas chromatography (GC). The ratio of 7-ketocholesterol/cholesterol 5,6-epoxides generated by irradiation was less than one, much lower than the ratio of ten commonly produced by autoxidation. Irradiation also produced relatively higher amounts of 7-hydroxycholesterol than did autoxidation. These unique product ratios may be suitable indicators of past exposure to irradiation.     

三氯化钌产品的质量控制

介绍了电解槽金属阳极涂层用三氯化钌行业标准的制定情况,对标准制定过程中的技术要求以及试验方法的确定进行了较详细的阐述。     

Compression characteristics of pharmaceutical powder mixtures

A study has been made of the compression characteristics of binary, ternary and quaternary mixtures of the ingredients of a typical griseofulvin tablet formulation. The results have been analysed in terms of the compression equations of Heckel and of Cooper and Eaton and in terms of Cheng's equation for tensile strength.The terms in these equations vary systemactically with the composition of the mixtures and they can be employed as a measure of the hardness and compressibility of the different mixtures.     

提高磷铵产品质量的措施

云南红磷化工有限责任公司于1993年建成的磷酸二铵装置(西班牙Incro公司技术),设计能力为12万t/a磷铵,采用预中和—氨化粒化造粒工艺,配套半水—二水磷酸装置。随着1999年4万t/a合成氨装置和2000年6万t/a磷酸装置相继建成投产,磷铵装置的生产能力不断提高。磷铵产品含水量常有偏高现象,产品粒度小,粉尘大,一度影响销售。经加强管理,进行技改,产品合格率达到100%。1　提高磷铵产品粒度合格率国标GB10205-10212-88规定磷铵产品粒度( 1～4mm)合格率不低于90%,即为优级品,磷酸二铵的成品筛就是根据此标准选择。在生产中,仍需用大量粒度合…     

如何控制三聚氰胺的产品质量

产品质量是影响产品经济效益的重要因素,本文根据河南煤业化工集团中原大化公司三聚氰胺装置投产以来的生产经验,总结了影响三聚氰胺产品质量的主要因素和操作中如何控制三聚氰胺的产品质量     

粉末丁腈橡胶的制造、性能及应用

粉末丁腈橡胶 (简称ＰＮＢＲ)是ＮＢＲ的一个特殊品牌。它与块状ＮＢＲ的最大区别就在于粒径的不同 ,其制造的关键是成粉技术。它有着优异的性能和广阔的应用前景。1　品种ＰＮＢＲ可以分为非交联型、半 (部分 )交联型及交联型。它们的粒径在 1 0ｍｍ以下。1 1　非交联型ＰＮＢＲ经粉碎成粉后用有机或无机隔离剂隔离。大体上是以块状胶和以胶乳或橡胶溶液为原料加工而成。以前者为简单 ,后者为经济。主要有机械粉碎、喷雾干燥、胶浆凝聚及化学反应等方法生产。2 0世纪 60年代以前 ,ＰＮＢＲ在我国还是空白 ,少量使用只能靠进口 ,自 70年代…     

从产品质量国家监督抽查结果看溶剂型木器涂料产品质量现状

通过2008年第4季度和2009年第1季度对溶剂型木器涂料国家监督抽查结果进行分析,对目前溶剂型木器涂料产品质量现状作出了评价,指出了当前溶剂型木器涂料生产、销售、质量监管等方面存在的问题,并提出了应采取相应措施的建议。     

提高φ3.8m×12m水泥磨产质量的技术措施

我厂２０００ｔ／ｄ熟料新型干法生产线的水泥粉磨是由２台 ３．８ｍ×１２ｍ闭路磨承担 ,设计台产量为#４２５Ｒ水泥６５ｔ／ｈ ,#５２５Ｒ水泥５５ｔ／ｈ。但自试产以来 ,该磨一直未达到设计能力 ,#４２５Ｒ产量在６０ｔ／ｈ左右 ,#５２５Ｒ产量在４０ｔ／ｈ左右。为此 ,我们对 #１水泥磨采取了一系列技术改造措施 ,使磨机的产量大幅度提高。本文作一简单介绍 ,仅供参考。１工艺流程简介 ３．８ｍ×１２ｍ水泥磨磨机分粗磨仓和细磨仓 ,物料从磨机进料装置喂入 ,经过磨机中空轴进入粗磨仓 ,然后经双层隔仓板进入细磨仓 ,最后经出料篦板、…     

Experimental equipment for checking the quality of magnesite powder

Conclusions Statistical relationships were obtained between the parameters of the quality of magnesite powder upon discharge from a rotary kiln, which allow the automatic control of the quality of the finished product.The Magnezit Factory is testing equipment for automatic determination of the bulk density of a liter of powder.The implementation of this equipment has demonstrated the validity of this scheme; industrial implementation can be recommended only after working checks have been made on the equipment in order to explain the reliability of its various units in operation and the scheme as a whole.With the automatic control of the quality of the finished product the information can be used in the despatch system.Translated from Ogneupory, No. 8, pp. 23–28, August, 1971.     

提高普通无磷洗衣粉质量和香气表现的探讨

随着国内无磷粉的产量日益增大,以及消费者对高性能价格比无磷粉产品的期望,无磷粉的技术问题重新摆上桌面.本文将回顾无磷洗衣粉主要成分,包括洗衣机理、活性成分、助剂、香精等对提高无磷洗衣粉质量进行探讨.