1 3 Butadiene
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. SPME Fiber Evaluation for Volatile Organic Compounds Extraction from Acerola
Volatile organic compounds (VOCs) were isolated from acerola fruits (Malpighia emarginata D.C.), by means of different solid phase microextraction (SPME) fibers. For the extraction, the headspace SPME method was used, identifying the VOCs by gas chromatography (GC) with mass spectrometry (MS). The objective of this work was to evaluate the efficiency of SPME
J. Braz. Chem. Soc.. Publicado em: 2019-02
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2. Estrategia para la optimización de un compuesto de caucho con aceite de soja utilizando diseños de experimentos
ABSTRACT When a rubber component is made, is necessary to start from a “rubber compound” which may be composed of one or more polymers and various additives or fillers. The development of an elastomer mixture to produce a compound with a specific end-use is complicated in the field of rubber technology. Therefore, the successful development of a compound
Matéria (Rio J.). Publicado em: 19/07/2018
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3. VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS
AbstractAl-MCM-41, 16%Ba/Al-MCM-41 and 1.4%Cr-16%Ba/Al-MCM-41 were used as catalysts in the vapor-phase catalytic conversion of ethanol. Physical-chemical properties of the catalysts and the effect of barium and chromium on the Al-MCM-41 activity and 1,3-butadiene yield were studied. The catalysts were characterized by X-ray diffraction (XRD), N2 physisorpti
Braz. J. Chem. Eng.. Publicado em: 2015-06
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4. Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system
The aim of this study was to incorporate an alpha-olefin (1-hexene or 1-dodecene) in a high cis polybutadiene chain, using a neodymium versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system. The influence of alpha-olefin on polymerization reaction and polymer characteristics, using different weight ratios of butadiene/α-olefin, was evaluated.
Polímeros. Publicado em: 2014
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5. Synthesis and characterization of butadiene-1,3 and octene-1 copolymer prepared by a Ziegler-Natta catalyst based on neodymium
The aim of this work is to evaluate the influence of octene-1 incorporation in the polybutadiene chain on the polymerization reaction and polymer characteristics. Thus, copolymerization of butadiene-1,3 with octene-1 using a Ziegler-Natta ternary catalyst based on neodymium was performed. The weight ratios of butadiene-1,3/α-olefin 100/0, 99/1, 97/3, 95/5,
Polímeros. Publicado em: 01/11/2011
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6. Copolimerização de 1,3-butadieno e alfa-olefinas com catalisadores à base de versatato de neodímio / Copolymaerization of butadiene - 1,3 e alpha-olefins by a catalyst based on meodymium versatate
Nesta Dissertação, foram realizadas reações de copolimerização de 1,3-butadieno com diferentes alfa-olefinas (1-hexeno, 1-octeno e 1-dodeceno) utilizando-se um sistema catalítico do tipo Ziegler-Natta ternário constituído por versatato de neodímio, hidreto de diisobutilalumínio e cloreto de t-butila. O sistema catalítico também foi avaliado em r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2010
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7. Indium mediated isoprenylation of carbonyl compounds with 2-bromomethyl-1,3-butadiene: a short synthesis of (+-)ipsenol
A isoprenilação de aldeídos e cetonas foi realizada através da inserção seletiva de índio sobre uma mistura de 2-bromometil-1,3-butadieno e seus isômeros vinílicos, com bons rendimentos. Uma síntese rápida do (±)-ipsenol, feromônio de agregação do besouro Ips paraconfusus, demonstra a utilidade deste método em síntese orgânica.
Publicado em: 2010
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8. Optimization of NMP extraction in 1, 3-butadiene production line
N-methylpyrrolidone is a powerful solvent for variety of chemical processes due to its vast chemical properties. It has been used in manufacturing processes of polymers, detergents, pharmaceuticals rubber and many more chemical substances. However, it creates large amount of residue in some of these processes which has to be dealt with. Many well known metho
Eclética Química. Publicado em: 2010
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9. Selective hydrogenation of 1,3-butadiene by transition metal compounds immobilized in 1-butyl-3-methyl imidazolium room temperature ionic liquids
Os complexos [Co(acac)2], [Co(acac)3], [Fe(acac)3] e [Ni(acac)2] (acac = acetilacetonato) dissolvidos em tetrafluoroborato de 1-butil-3-metilimidazônio (1), trifluorometanosulfonato de 1- butil-3-metilimidazólio (2) ou hexafluorofosfato de 1-butil-3-metilimidazólio (3), catalisam a hidrogenação de 1,3-butadieno em butenos em sistema catalítico tipicame
Publicado em: 2010
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10. Recovery of p-TBC from a butadiene washing stream in a pilot plant
Results obtained in a pilot-scale unit designed for COD removal and p-TBC (p-tert-butylcatechol) recovery from a butadiene washing stream (pH 14, 200,000 mg COD L-1, highly toxic) at a petrochemical industry are presented. By adding H3PO4, phase separation is achieved and p-TBC is successfully recovered (88 g L-1 of washing stream). Information (time for pha
Brazilian Journal of Chemical Engineering. Publicado em: 2009-12
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11. Rheological evaluation of polymer-modified asphalt binders
Currently, the most used polymer for asphalt binder modification is the thermoplastic elastomer styrene butadiene styrene (SBS) and aromatic oil is commonly added to the mixtures to improve their compatibly. This paper proposes the use of oil shale from sedimentary rock as a compatibilizer agent for polymer-modified asphalt binder (PMB). PMBs were produced b
Materials Research. Publicado em: 2008-09
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12. DinÃmica direta e mecanismos das reaÃÃes de diels-alder e de desidrataÃÃo de Ãlcool
The dynamics of dehydration of the protonated (R)-3,3-dimethylbutan-2-ol (pinacolylalcohol) isomer, [(CH3)3-C-CH(OH2)CH3]+, and of ethene + 1,3-butadiene cycloaddition were studied with the Born-Oppenheimer molecular dynamics (BOMD) technique for the direct dynamics using the AM1 method. The AM1 potential energy surface (PES) for the protonated pinacolyl alc
Publicado em: 2008