N-甲酰吗啉芳烃抽提塔试验研究

用小型碳钢筛板萃取塔进行了宽馏分重整脱庚烷油的N 甲酰吗啉抽提试验 ,考察了抽提温度、溶剂比、溶剂含水率对总芳烃收率及选择性的影响。结果表明 ,在抽提温度为 60℃、溶剂含水为 3 % (m )和溶剂比S/F =4(V)的抽提操作条件下 ,溶剂选择性较高 ,并可获得高的芳烃回收率     

饲料级磷酸氢钙标准样品的研制

简述了饲料级磷酸氢钙标准样品的研制过程，并对样品作了稳定性试验，对搅拌设备的搅拌均匀性和物料的均匀性进行了测定，并由国家认可实验室进行了定值数据的监测。通过对比实验证明了国家实验室之间的无差异性。实验数据表明了所测定的饲料级磷酸氢钙产品是稳定和均匀的，同时简要介绍标准样品的研制程序，为开发其他化工行业标准样品奠定了基础。     

注塑模具浇注系统三维参数化设计研究

注塑模的浇注系统包括主流道、分流道和浇口，运用基本特征的方法，把浇注系统作为设计特征，实现了浇注系统与成型零件的同时生成。     

混凝浑液面沉速与混凝剂投加量的关系研究

探讨了黄河高浊度水混凝沉淀浑液面沉速与自然沉速之间的相关性,经过对实验数据进行线性回归提出了混凝过程中浑液面沉速与自然沉速、含沙量、PAM投加量之间的经验公式。运用该经验公式得出的浑液面沉速计算值与实测相对误差在0.43%～12.27%之间。     

鲁北平原养鸡场周边包气带与地下水砷化合物分布规律

洛克沙胂(3-硝基-4-羟基苯胂酸)被广泛用作饲料添加剂,但大部分以原体形式随粪便排出,进入环境的洛克沙胂在微生物和光照作用下最终转化为毒性较大的As(V)和As(III)等,并在雨水或农灌的淋滤冲积下污染周边土壤、地表水和地下水。以鲁北平原某养鸡场为研究区,对鸡粪、饲料、周边表层土壤、鸡粪堆积和背景包气带垂向剖面以及地下水进行洛克沙胂及其代谢物的检测,结果饲料中洛克沙胂浓度为34mg/kg,鸡粪中HAPA(3-氨基-4-羟基苯胂酸)浓度为11 mg/kg,距离鸡场越近的表层土壤砷含量越高。三个包气带垂向剖面均以As(V)为主,As(III)含量较小。鸡粪堆积处垂向剖面上HAPA、As(V)和As(III)在土壤表层含量最高,浓度随深度增加而呈下降趋势,同时受到土壤岩性的影响,砷化合物主要的吸附层位为0~30cm与200cm以下;背景包气带垂向剖面上各砷化合物含量均明显低于鸡粪堆积处包气带垂向剖面的砷化合物含量;在鸡场内旧井中检测到浓度为165μg/kg的As(V)。结果证实鸡粪堆积导致土壤包气带、周边土壤和地下水砷含量增加,且这种污染很难消除。     

一种具有发展前景的饲料磷酸盐——脱氟磷酸三钙

脱氟磷酸三钙由于含钙量高、钙磷比适合于喂养家禽，是良好的饲料磷酸盐。它是由磷矿和其它添加物团粒，经高温焙烧后制成。具有工艺流程简单、生产成本低等优点。可结合本地情况，发展生产。     

全球蛋氨酸市场现状分析

目前全球蛋氨酸市场由少数几家公司控制 ,其中Novus、Degussa、Adiesso公司分别占有 3 4%、3 0 %和 2 8%的市场份额 ,国内迄今尚未有一套规模型生产装置。而亚洲地区蛋氨酸供应紧张 ,中国作为世界第二大饲料生产国 ,对蛋氨酸的需求更高 ,目前我国主要依靠进口解决需求问题 ,2 0 0 1～ 2 0 0 3年每年进口量均在 5万t/a以上。     

全球氨基酸市场供需与预测

概述了近年来饲料添加剂用氨基酸类的现状和今后发展。着重介绍了氨基酸中主要产品蛋氨酸、赖氨酸和苏氨酸在美国、欧盟和日本的生产和市场发展动向。由于这类食品添加剂需求强劲，目前，该市场正处在回升之中。     

Dynamic Mechanical Properties and Adhesive Strengths of Emulsion Polymer by Power Feed Technique, I

Dynamic mechanical properties and adhesive strengths of power feed copolymer and random copolymer synthesized using styrene or methyl methacrylate and n-butyl acrylate were investigated. Although the two systems were synthesized from the same raw materials, power feed copolymer had a very broad transition compared with random copolymer. This fact was explained by the fact that the system synthesized through power feed method was an alloy of copolymers which are a continuous series from monomer A rich copolymers to monomer B rich copolymers. The dynamic mechanical behavior of film cast from solution was almost the same as that of emulsion film, which indicated more extensive application of power feed copolymer. In the P(nBA/St) system, power feed copolymer maintained its adhesive strengths over a wide temperature range compared with random copolymer. The absolute value, however, was not so high. This was due to the low cohesive strengths of the films.     

Ethanol vapor deactivation of gossypol in cottonseed meal

Most cottonseed cultivars contain gossypol, a polyphenolic antinutritional compound. “Free” gossypol is a physiologically active form of gossypol, which is toxic to young- and nonruminant animals. To utilize solvent-extracted cottonseed meal as a general feed, gossypol must be either removed or deactivated to a minimum level specified for each class of animal. Normally, deactivation is carried out prior to oil extraction; however, the desired level of deactivation is not always attained. A new supplemental method of deactivation has been found by using either ethanol or isopropanol vapors on solventextracted meal. In a bench-top set-up, ethanol vapor reduced free gossypol from 0.115 to 0.053%, and a further reduction to 0.026% has been observed with the addition of ferrous sulfate. The supplemental deactivation method can, in most cases, reduce free gossypol to significantly safer levels for feeding, thus increasing utility, and possibly demand, for cottonseed meal as a general animal feed protein source. Presented in part at the AOCS Annual Meeting, Atlanta, GA, May 8–12, 1994.