减粘塔减粘技术在乙烯装置上的应用

分析了传统的急冷油减粘方法的不足之处,阐述了减粘塔减粘的原理,并结合减粘塔的工艺特殊性,列举了具体的设计改进、工艺调整以及安全运行防堵措施。介绍了中国石化扬子石油化工股份有限公司烯烃厂1#、2#乙烯装置减粘塔运行情况与效果,并针对遗留问题,提出了改造方案。     

Lowland rice response to potassium fertilization and its effect on N and P uptake

Not much is known about the response of lowland rice to K fertilization under Brazilian conditions. A field experiment was conducted during four consecutive years to determine the response of three lowland rice (Oryza sativa L.) cultivars to K fertilization on a Low Humic Gley soil. In the first two years, K was broadcast at rates of 0, 42, 84, 126, and 168 kg K ha^–1. In the last two years K rates were reduced to 0, 25, 50, 75, and 100 kg K ha^–1 and applied in a band. Potassium significantly (P < 0.01) increased grain yields but the response varied from cultivar to cultivar and year to year. Yield responses to K fertilization were superimposed on a general trend of increasing grain yields across the four growing seasons. Mean grain yields increased 14.3% with broadcast application of K in the first two years and 10.4% with banded application of K in the last two years when compared to the control treatments. Extractable soil K increased with K application rate and decreased with soil depth. Potassium was rapidly removed from the soil and yearly broadcast or banded application of K can be expected to result in a significant increase in grain yield of lowland rice in these soils.     

上海市创立最早的杨树浦水厂

该文介绍了具有120年供水历史的上海杨树浦水厂的创建和发展、供水现状与技术管理，以及为提高水质和供水可靠性采取的技术和管理措施。     

米糠-硫酸直接浸锰工艺条件研究

以米糠及湘西软锰矿为原料,对米糠-硫酸直接浸锰制备硫酸锰的工艺条件进行了研究。结果表明,米糠-硫酸法浸锰的最佳工艺条件为:浸锰温度250℃,硫酸质量分数50%,浸锰时间75min,米糠用量为软锰矿粉质量的20%,硫酸用量为其理论用量的110%。按该工艺条件浸锰,锰的浸出率可达95%以上。该工艺具有能耗少、生产成本低、锰的浸出率高等优点,为软锰矿的开发利用开辟了一条新途径。     

我国热带地区燃料油植物资源的开发和利用

论述了我国热带地区燃料油植物资源的开发意义及燃料油植物的特点;介绍了热带地区种子或种仁含油率大于50 % 的15种燃料油植物的分布及生物学特性;提出了热带燃料油植物研究与开发利用需解决的问题和热带燃料油植物应用前景.     

催化湿式氧化处理农药废水的研究

利用担载型双金属活性组分催化剂，考察了反应温度、压力、进料空速和V（空气）：V（H2O）（体积比）等反应条件对催化湿式氧化处理某农药废水效果的影响。对于该种废水，在4．2MPa，245℃，空速为2．0h^-1，V（空气）：V（H2O）＝300的反应条件下，废水的COD去除率可达到91．3％。经处理后废水的BOD5／COD＞0．5，说明其可生化性能良好。     

美国能源部的浆态床F－T合成技术

浆态床Ｆ－Ｔ合成技术是美国能源部Ｆ－Ｔ合成技术的主要开发项目。本文就浆态相Ｆ－Ｔ合成催化剂的开发、中试示范实验和浆态反应器的化工基础研究作一扼要的介绍。     

大型空分制氧站DCS调试技术

以宝钢集团浦钢60000 Nm3/h的大型空分制氧站DCS调试为基础,结合以往大型空分制氧站DCS调试经验,探讨了大型空分制氧站DCS调试的特点、施工组织、调试工艺及方法,并对控制回路试验、离心式压缩机防喘振控制组态、压缩机起停及控制逻辑、紧急停车及重要安全回路调试、组态临时变更管理等重点、难点及关键环节的调试技术进行了详细的总结、说明,旨在为其他同类工程提供参考与借鉴.     

重钙装置改产磷铵反应与尾气洗涤系统设备出现的问题

介绍瓮福磷肥厂重钙(TSP)装置改产DAP后,反应与尾气洗涤系统料浆泵、搅拌器、反应器、洗涤泵、重要阀门在运行中出现的问题及处理措施.     

Lipid hydrolysis and oxidation on the surface of milled rice

The changes in milled rice FFA content and composition and in conjugated diene (CD) content and bacterial, yeast, and mold counts were determined at 24, 37, and 50°C and 70% RH over 50 d. There was a rapid rate of FFA formation during the first few days of storage, which was optimal at 37°C, but that slowed after 2, 4, and 5 d at 37, 24, and 50°C, respectively. There was a second increase in FFA after about day 12 that increased with increasing temperature, indicating nonlipase hydrolysis. Linoleic and oleic acids were the main components of the total FFA produced on the surface of milled rice. The pattern of CD development followed that of FFA increase. Bacterial growth correlated with increased FFA levels after 12 d of storage, suggesting that bacterial lipase rather than bran lipase may be responsible for rice lipid hydrolysis