Efficient low-temperature debromination and high selectivity products recovery from brominated epoxy resin waste by subcritical water-urea treatment

2020 ◽  
Vol 109 ◽  
pp. 171-180 ◽  
Author(s):  
Fu-Rong Xiu ◽  
Yifan Li ◽  
Yingying Qi
Keyword(s):  
Low Temperature ◽  
Epoxy Resin ◽  
High Selectivity ◽  
Subcritical Water ◽  
Urea Treatment ◽  
Brominated Epoxy Resin

scholarly journals Aluminum oxide carrier for a catalyst for low-temperature isomerization of hydrocarbons

2020 ◽  
Vol 15 (3) ◽  
pp. 58-69
Author(s):  
N. Tagandurdyyeva ◽  
N. V. Maltseva ◽  
T. A. Vishnevskaya ◽  
V. N. Narayev ◽  
A. Yu. Postnov
Keyword(s):  
Low Temperature ◽  
Polyvinyl Alcohol ◽  
Aluminum Oxide ◽  
High Selectivity ◽  
Ph Value ◽  
Strength Properties ◽  
Isomerization Reaction ◽  
Preparation Conditions ◽  
Constant Ph ◽  
Extrusion Method

Objectives. Determine the necessary conditions for obtaining a granulated η-Al2O3 carrier, investigate its structural and strength properties, and evaluate its activity for the model n-butane isomerization reaction.Methods. Samples containing bayerite structure aluminum trihydroxide were synthesized by precipitation from aqueous solutions of aluminum nitrate with ammonia under isothermal conditions at a constant pH value. The samples of the granulated carrier were obtained using an extrusion method when the composition of molding pastes was varied by tuning the ratio of bayerite- and η-Al2O3 -containing components and introducing polyvinyl alcohol.Results. The influence of the preparation conditions on the structural and strength properties of the active Al2O3 granules is evaluated. Samples of the aluminum oxide carrier were tested for a model reaction of low-temperature isomerization of n-butane, demonstrating a sufficiently high selectivity and reasonable prospects for use as catalysts for low-temperature isomerization of hydrocarbons.Conclusions. Increasing the content of the polyvinyl alcohol in the molding paste from 0.4 to 1.8 wt % is accompanied by an increase in the predominant sizes of the mesopores in the range of 10–50 nm and pores in the range of 50–80 nm, explaining the high values of all recorded parameters for the process of isomerization of n-butane.

Experimental study of low-temperature long-time relaxation in epoxy resin

1987 ◽  
Vol 68 (3-4) ◽  
pp. 285-299 ◽  
Author(s):  
M. Koláč ◽  
B. S. Neganov ◽  
A. Sahling ◽  
S. Sahling
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Epoxy Resin ◽  
Time Relaxation ◽  
Long Time

Polymer Insulation for Superconductive Application

2017 ◽  
pp. 350-386
Keyword(s):  
Low Temperature ◽  
Epoxy Resin ◽  
Pulse Frequency ◽  
Void Defect ◽  
Electrical Tree ◽  
Important Quality ◽  
Solid Dielectrics ◽  
Number Of Discharges ◽  
Inception Voltage

With the research and development of high temperature superconducting technology, superconducting insulating materials under liquid helium and nitrogen temperature have been gradually taken seriously. Considering the unique operating environment, epoxy resin and PI face the challenge of low temperature. Electrical tree is one of the aging failure phenomena occurring in solid dielectrics. These imperfections could cause the field concentration with the application of high voltage, which results in partial discharges (PD). PD testing is an important quality check for the insulation of HTS cable. This chapter presents a study aimed at clarifying the influence of low temperature, pulse frequency and pulse duration on the electrical tree characteristics in epoxy resin, as well as PD characterization of PI film in LN2. The results show that the number of discharges and the discharge quantity in PI films increase with the increasing of the applied voltage and the defect size. The PD inception voltage decreases when the void defect diameter in PI enlarged and it is higher in LN2 than that at room temperature.

Dielectric Investigations of the Low-temperature Curing of Epoxy Resin ED-20

2004 ◽  
Vol 31 (5) ◽  
pp. 17-21 ◽  
Author(s):  
I. A. Chernov ◽  
T. R. Deberdeev ◽  
G. F. Novikov ◽  
R. M. Garipov ◽  
V. I. Irzhak
Keyword(s):  
Low Temperature ◽  
Epoxy Resin

Permanganate-Induced Efficient Mineralization of Poly(vinylidene fluoride) and Vinylidene-Fluoride Based Copolymers in Low-Temperature Subcritical Water

2019 ◽  
Vol 58 (29) ◽  
pp. 13030-13040 ◽  
Author(s):  
Ryo Honma ◽  
Hisao Hori ◽  
Fernando Reis da Cunha ◽  
Naoki Horiike ◽  
Lucia Steinbach ◽  
...  
Keyword(s):  
Low Temperature ◽  
Vinylidene Fluoride ◽  
Subcritical Water ◽  
Poly Vinylidene Fluoride

High selectivity of a CuO modified hollow SnO2 nanofiber gas sensor to H2S at low temperature

2017 ◽  
Vol 79 (3) ◽  
pp. 30101 ◽  
Author(s):  
Jiejie Yang ◽  
Chaojun Gao ◽  
Hui Yang ◽  
Xinchang Wang ◽  
Jianfeng Jia
Keyword(s):  
Low Temperature ◽  
Gas Sensor ◽  
High Selectivity ◽  
Sno2 Nanofiber

Studies on the Immobilized-Lipase-Catalyzed Esterification of Alkyl Oleates in Solvent-Free Systems

2013 ◽  
Vol 645 ◽  
pp. 19-23 ◽  
Author(s):  
Hui Zhong ◽  
Zheng Fang ◽  
Bao Hua Zou ◽  
Xin Li ◽  
Kai Guo
Keyword(s):  
Oleic Acid ◽  
Low Temperature ◽  
High Selectivity ◽  
Immobilized Lipase ◽  
Enzyme Concentration ◽  
Molar Ratio ◽  
High Yield ◽  
Secondary Alcohols ◽  
Tertiary Alcohols ◽  
Candida Sp

The esterification of oleic acid with alkyl alcohols in solv ent-free systems was catalyzed by an immobilized lipase from Candida sp . 99-125. The influence of several factors, including enzyme concentration, temperature, molar ratio between oleic acid and alkyl alcohols, and structure of alcohol was also investigated. The results indicated that the reactions catalyzed by lipase at 20 o C, in the presence of 3% (w/w) lipase, on the molar ratio of 1:1 between oleic acid and alcohols, afforded products in high yield. It showed high selectivity to primary and low selectivity to secondary alcohols and tertiary alcohols because of the sterically hindered effect. Methanol has certain toxicity on the activity of the lipase. The lipase from Candida sp. 99-125 was identified to be an effective catalyst in the esterification of alcohol and oleic acid at low temperature.

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