废酸增稠器搅拌桨的防腐

我公司过磷酸钙生产使用钛白粉生产产生的废硫酸，此废酸w（H2SO4）约10％，w（FeSO4）约7％。如将此废酸直接加入混合器中，由于FeSO4的存在，不仅易使过磷酸钙结块，而且使有效磷退化。     

钛白废酸在过磷酸钙生产中的应用

硫酸法钛白粉生产会产生w（H2SO4）21％、w（FeO）5．6％的废酸,如直接用于过磷酸钙生产,因FeO存在会造成硫酸输送管道堵塞,过磷酸钙结块和有效磷退化。介绍除去废酸中FeO的工艺技术,可使酸中的Ⅲ（FeO）降至0．27％。几年来回收废酸（折纯100％）4．63万t,合计创效益3240万元。     

钛白废酸在过磷酸钙生产中的应用

介绍钛白废酸在过磷酸钙生产中的应用 ,提出两段加酸法既能较多使用废酸 ,又可避免废酸中硫酸亚铁结晶对过磷酸钙正常生产的影响。 15万吨 /年过磷酸钙可消化 6 0 0 0吨 /年钛白粉所产生的废酸 ,降低了过磷酸钙成本 ,工艺简单可靠 ,是钛白废酸利用的有效途径     

简讯

吉林石化硫酸法钛白粉生产中废酸的回收方法获国家专利由吉林石化分公司开发成功的硫酸法钛白粉生产中废酸的回收方法 ,日前获国家发明专利 (专利号 :0 2 1 0 90 98.X)。目前国内生产钛白粉的主要方法为硫酸法和氯化法 ,硫酸法具有原料来源充足 ,生产成本低等优点 ,但生产过程中会产生大量的废硫酸 ,如果不经过处理直接排放 ,会造成环境污染 ;如果处理方法选择不当 ,还会大幅度提高生产成本。科研人员针对硫酸法钛白粉生产废酸中含有大量固形钛和无机盐的特点 ,开发出专用于硫酸法钛白粉生产过程中排放的废酸浓缩回收技术 ,提出了分离固形…     

钛白废酸制普钙的商榷

在硫酸法钛白粉生产中,会产生大量难以处理的废硫酸,而普钙生产又需要大量的硫酸。能否利用钛白废酸来生产普钙?本文阐述用钛白废酸直接制普钙并不可取的理由。     

工信部发布钛白粉行业清洁生产技术推广方案

8月16日国家工信部发布钛白粉行业清洁生产技术推广方案。其中应用技术有：沸腾氯化法钛白粉生产技术,钛矿连续酸解技术,利用联产硫酸与钛白粉生产过程产生的废热将硫酸法钛白粉副产的废酸浓缩,硫钛联产节能和废副处理（废酸浓缩渣或硫酸亚铁与硫精砂或硫磺混合制酸）技术,     

用生产钛白粉的废酸和软锰矿生产硫酸锰

我国的钛白粉生产仍以硫酸法为主,排放的废酸中含有大量的硫酸和硫酸亚铁,同时,我国南方有大量的低品位软锰矿(含MnO_245%以下)尚未利用。笔者经过研究,利用生产钛白粉的废酸和低品位软锰矿为原料,选择适宜条件,联合生产应用广泛的硫酸锰和碳酸锰,取得了显著的经济效益和社会效益。     

硫酸法生产钛白的废酸治理

介绍了硫酸法生产钛白粉过程中产生的废酸和酸性废水，采用浸没燃烧和真空浓缩将废酸浓缩；用升流式石灰石滤池中和处理废水。     

钛白废酸的综合利用研究现状及展望

硫酸法钛白生产中,每生产1t钛白约产生硫酸质量分数在20%左右的废酸8～10 t,废酸的治理和综合利用是解决钛白生产环境污染的一项重要工作.综述了近年来国内外对钛白废酸治理与综合利用所采取的一些措施,介绍了硫酸回收常用的浓缩、扩散渗析及萃取等方法;总结了以钛白废酸为原料生产硫酸亚铁铵、石膏、人造金红石、过磷酸钙、聚合硫酸铁及铁红颜料的各种工艺;重点阐述了从钛白废酸中分离提取钛、钒、钪、铁等有价金属的方法.提出了治理废酸的同时,综合利用钛白废酸中的各种资源,变废为宝,指明钛白废酸综合利用的发展方向.     

全钛渣原料硫酸法钛白粉生产工艺环境评价

硫酸法钛白粉生产过程副产的硫酸亚铁和废酸是制约硫酸法钛白粉生产工艺发展的重要因素之一。硫酸法钛白粉生产工艺所用原料有3种：全钛精矿、渣矿混合和全钛渣。对不同原料硫酸法钛白粉生产工艺的环境负荷进行了研究,结果表明：采用全钛渣为原料的硫酸法钛白粉生产工艺既能减少副产物对环境的影响,又能降低酸耗、能耗,是现阶段硫酸法钛白粉生产工艺中环境最优的。     

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。