萃取法硫酸钾中试通过河南省科委技术鉴定

我国盛产烟草、水果、茶叶等喜钾忌氯的农作物,他们需要的氮磷钾养分中,钾肥必须是无氯钾肥。无氯钾肥有硫酸钾、硝酸钾两个品种,以硫酸钾为主。施用无氯钾肥不仅能提高作物产量,而且能提高作物产品的质量,如烟草的可燃性、水果的糖度、薯类的淀粉含量等。在旱干地区施用还可以避免对作物有害的氯化物积累,以保持稳定的高产肥力。特别是硫酸钾,除钾元素外,还可为土壤补充硫     

K~+,Ca~(2+),NH_4~+||C1~-,SO_4~(2-)-H_2O体系中硫酸钾生成规律的实验研究

本文运用正交试验设计及数理统计分析方法研究了多元凝聚体系K＋，Ca2＋；NH4+｜｜C1－，SO42-－H2O中硫酸钾的生成规律，取得了最佳工艺参数及其工程平均结果表明氯化钾转化率可达94．52％     

一步解氯法制备硫酸钾及一步法生产氮磷钾复肥

本发明是一步解氯制备硫酸钾及一步生产氮磷钾复肥的方法 ,是以氯化钾和硫酸铵为原料制备硫酸钾 ,并利用其母液生产氮磷钾复肥和普通过磷酸钙。在制备过程中加入解氯剂 ,于常温常压下 ,一步制备得农用硫酸钾 ,并利用分离硫酸钾后的母液配酸处理磷矿粉 ,一步生产氮磷钾复肥和含一定量氮钾的普通过磷酸钙 ,无废渣、废液产生。所生产的复肥既可作烤烟专用肥 ,也可作通用复肥。一步解氯法制备硫酸钾及一步法生产氮磷钾复肥     

复分解四步循环法制取硫酸钾新工艺

介绍了制取硫酸钾的一种新工艺－－复分解四步循环法，即氯化钾与硫酸铵反应生成硫酸钾铵与氯化铵钾，硫酸钾铵再与氯化钾溶液反应生成硫酸钾，氯化铵钾再与硫酸铵溶液反应生成氯化铵。整个工艺全封闭循环生产，产品硫酸钾K2O质量分数≥50％，钾收率达92％。     

一种高浓度无氯复合肥料的制法

我国目前生产的氮磷钾复合肥料,N、P_2O_5、K_2O的含量大致各为10％左右。本文介绍苏联近几年研制成功的一种高浓度无氯三元复合肥料,当改变原料配比时,可制得任何比例营养物质的复合肥料。     

一步解氯法制备硫酸钾的工艺条件研究

对用一步解氯法制备硫酸钾的工艺条件进行了详细地研究 ,结果表明 ,在KCl- (NH4 ) 2 SO4 -H2 O体系中加入 2 2 %～ 2 .5 %的解氯剂 ,可使K2 SO4 产品中的氯离子含量降低到 2 5 %以下 ,达到农用硫酸钾的国家标准     

铵法处理磷石膏制硫酸钾的研究

实验研究了综合利用磷石膏废渣制硫酸钾的新方法。所用原料包括农用碳酸氢铵和氯化钾, 副产氯化钾铵复合肥和碳酸钙。流程中包括硫酸铵溶液的制备、复分解制硫酸钾铵、硫酸钾产品的制备和氯化钾铵的回收四个部分。在优惠工艺条件下, 产品硫酸钾符合标准一级品要求, 其中, Ｋ２ Ｏ＞ ４５ ％ , Ｃｌ＜ １ ．５ ％ ; Ｋ２ Ｏ 转化率＞ ７６ ％ , 全流程 Ｋ２ Ｏ 总收率＞ ９７ ％ , Ｎ 总收率＞９３ ％ , 磷石膏中硫酸根转化率＞ ９３ ％ 。     

缔置法生产的硫酸钾中氯含量的测定

无机化工产品中，氯的通用测定方法有电位滴定法（GB3050－82）和汞量法（GB3051－82），而在农用硫酸钾中，氯离子测定方法（GB21006－89）与汞量法基本相同。用上述方法测定氯含量时，均采用澳酚蓝作指示剂调节试液的PH值。我厂是采用缔置法技术生产农用硫酸钾。用该法生产的硫酸钾产品中，由于含有微量的有机缔合剂，在用汞量法测定氯含量时，它会影响溴酚蓝指示剂的颜色，同时还与Hg（NO3）2标准溶液反应，从而干扰测定。为此，我们对缔合剂影响江含量测定的有关因素进行了探索试验。1仪器和试剂1．1酸度计：PHS－3C型；1．2电磁…     

专利介绍

专利申请号 :9710 7710　　公开号 :12 13 64 6专利名称 :一步解氯法制备硫酸钾及一步法生产氮磷钾复肥文摘 :本发明是一步解氯制备硫酸钾及一步生产氮磷钾复肥的方法 ,是以氯化钾和硫酸铵为原料制备硫酸钾 ,并利用其母液生产氮磷钾复肥和普通过磷酸钙。在制备过程中加入解氯剂 ,于常温常压下 ,一步制备得农用硫酸钾 ,并利用分离硫酸钾后的母液配酸处理磷矿粉 ,一步生产氮磷钾复肥和含一定量氮钾的普通过磷酸钙 ,无废渣、废液产生。所生产的复肥既可作烤烟专用肥 ,也可作通用复肥。专利申请号 :9710 7676　　公开号 :12 10 840专利名称 :利…     

氟石膏制硫酸钾的工艺探讨

利用氟石膏、氯化钾为原料，采用碳铵为中间体的间接法工艺制备硫酸钾，研究了影响工艺过程的因素，ＳＯ４２－和Ｋ＋的转化率均在７５％以上     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。