Yantai Wanhua Polyurethanes Co

Yantai, China

Yantai Wanhua Polyurethanes Co

Yantai, China
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Wang Y.,Jilin University | Wang W.,Yantai Wanhua Polyurethanes Co. | Song W.,Jilin University
Electrochimica Acta | Year: 2011

Cobalt oxide-doped copper oxide composite nanofibers (CCNFs) were successfully achieved via electrospinning followed by thermal treatment processes and then exploited as active electrode material for direct enzyme-free fructose detection. The morphology and the structure of as-prepared samples were investigated by X-ray diffraction spectrum (XRD) and scanning electron microscopy (SEM). The electrocatalytic activity of CCNFs films towards fructose oxidation and sensing performances were evaluated by conventional electrochemical techniques. Cyclic voltammetry (CV) and chronoamperometry (I-t) revealed the distinctly enhanced sensing properties towards fructose compared to pure copper oxide nanofibers (CNFs), i.e., showing significantly lowered overpotential of 0.30 V, ultrafast (1 s) and ultrasensitive (18.988 μA mM-1) current response in a wide linear range of 1.0 × 10 -5 M to 6.0 × 10-3 M with satisfied reproducibility and stability, which could be ascribed to the synergic catalytic effect of the binary CuO/Co3O4 composite nanofibers and the highly porous three-dimensional network films structure of the CCNFs. In addition, a good selectivity for fructose detection was achieved. Results in this work demonstrated that CCNFs is one of the promising catalytic electrode materials for enzymeless fructose sensor fabrication. © 2011 Elsevier Ltd. All Rights Reserved.


Kang J.,Xiamen University | Cheng K.,Xiamen University | Zhang L.,Xiamen University | Zhang Q.,Xiamen University | And 5 more authors.
Angewandte Chemie - International Edition | Year: 2011

A highly selective catalyst based on mesoporous zeolites for the production of C5-C11 isoparaffins from syngas has been developed. The selectivity to C5-C11 hydrocarbons over Ru/meso-ZSM-5 reaches about 80 % with a ratio of isoparaffins to n-paraffins of 2.7:1. The mesoporous structure and the unique acidity of meso-ZSM-5 play key roles in tuning the product selectivity by controlling the secondary hydrocracking reactions. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ding J.,Yantai Wanhua Polyurethanes Co. | Hua W.,Yantai Wanhua Polyurethanes Co.
Chemical Engineering and Technology | Year: 2013

While ethylene crackers in Middle East and North America are shifting to ethane feedstocks and the volume of propylene production is becoming less, the market share of on-purpose propylene production technologies keeps on increasing. In Northeast Asia, due to the shortage of naphtha and natural gas, methanol-to-olefin and methanol-to-propylene technologies attract much attention. In addition, biochemical technologies are impinging the propylene downstream. Using starch, sugar, or biomass as raw materials, important industrial chemicals such as acrylic acid, butanol, and 1,3-propanediol can be produced. Propylene glycol and epichlorohydrine can be manufactured using glycerine, the byproduct of biodiesel. All these factors are changing the traditional C3 value chain profoundly. The status of the game-changing technologies related to the C3 value chain is presented. The relevant factors and the implications will be discussed. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ding J.,Yantai Wanhua Polyurethanes Co. | Hua W.,Yantai Wanhua Polyurethanes Co. | Zhang H.,Yantai Wanhua Polyurethanes Co. | Lou Y.,Yantai Wanhua Polyurethanes Co.
Journal of Cleaner Production | Year: 2013

Chlorine and chlorine-containing compounds have been widely used in various reactions but the atom efficiency of chlorine is usually very low. In polyurethane industry, the synthesis of isocyanates generates significant amount of by-product HCl gas and wastewater containing salt. How to recycle and reuse them is a critical concern of the Polyurethane (PU) industry. Especially, the rapid expansion of PU industry in developing countries urges cost-effective solutions for chlorine recycling. The authors led a group of scientists and engineers and developed two advanced technologies to realize the closed-loop recycling of chlorine. Using the hydrogen chloride catalytic oxidation technology, the by-product HCl gas can be converted to Cl2, with much lower energy consumption than that of the traditional chlor-alkali process. After treatment, the waste brine generated from the Methylene Diphenyl Diisocyanate (MDI) plant can be used as the electrolyte in chlor-alkali industry. The application of these two technologies brings significant economic, environmental and societal benefits. © 2012 Elsevier Ltd. All rights reserved.


Ding J.,Yantai Wanhua Polyurethanes Co. | Hua W.,Yantai Wanhua Polyurethanes Co.
Resources, Conservation and Recycling | Year: 2012

Development of eco-industrial parks (EIP) is an effective method for recycling, reuse and conservation. Facing resource shortage as well as stringent energy saving and emission reduction targets, the importance of EIPs are getting ever-increasing attention in China. In this paper, the history and current status of EIPs in China are reviewed. The synergies in several unique chemical industrial parks are delineated. The critical factors for the development of chemical industrial parks in China are discussed and the outlook for the path forward is presented. © 2012 Elsevier B.V. All rights reserved.


Patent
Yantai Wanhua Polyurethanes Co. and Ningbo Wanhua Polyurethanes Co. | Date: 2012-08-01

The present invention relates to a catalyst for producing chlorine by oxidation of hydrogen chloride and a method for preparing the same. The catalyst comprises a support and active ingredients that comprise 1-20 wt% of copper, 0.01-5 wt% of boron, 0.1-10 wt% of alkali metal element(s), 0.1-15 wt% of one or more rare earth elements, and 0-10 wt% of one or more elements selected from magnesium, calcium, barium, manganese, iron, nickel, cobalt, zinc, ruthenium or titanium based on the total weight of the catalyst. The catalyst is prepared by a two-step impregnation method. Comparing with the available catalysts of the same type, the catalyst according to the present invention has greatly improved conversion and stability.


Patent
Yantai Wanhua Polyurethanes Co. | Date: 2012-08-15

Disclosed is a rapid mixing reactor, comprising a first feed-in passage housing, a reactor housing, a second feed-in passage, a hollow blade-wheel feed distributor, a rotation shaft, and a first feed distributor, wherein the first feed-in passage housing and the reactor housing are constructed coaxially and communicated with each other; the second feed-in passage, the hollow blade-wheel feed distributor and the rotation shaft each are fixed in connection with each other in the sequence along the central axis of the reactor; the hollow blade-wheel feed distributor is located within the reactor housing and rotates axially under the driving force of the rotation shaft; the second feed-in passage is connected with the hollow blade-wheel feed distributor; the first feed-in passage housing is set up with at least one first feed-in inlet therein; the reactor housing is set up with at least one reaction liquid outlet at its distal end; and the first feed distributor and the hollow blade-wheel feed distributor are provided with first feed-in jetting hole(s) and second feed-in jetting hole(s), respectively. The reactor is capable of effecting instantaneously rapid mixing of two streams of fluid under a massive capacity, and improving the yield and quality of the target product.


Patent
Ningbo Wanhua Polyurethanes Co. and Yantai Wanhua Polyurethanes Co. | Date: 2012-09-26

The present invention discloses a method for intermittently producing 4,4-diaminodicyclohexyl methane (H_(12)MDA) with a low amount of the trans-trans isomer thereof, which comprises: controlling the reaction process by stopping the reaction when, except for a solvent, the reaction solution comprises MDA of 0-5 wt% and H_(6)MAD of 1-20 wt%; and b) separating the reaction solution obtained from step a) by conventional means to obtain H_(12)MDA product with desired purity, and allowing the un-reacted material and intermediate product to be recycled to the reactor after being accumulated. The method of the present invention decreases the amount of the trans-trans isomer in H_(12)MDA, increases the yield of the reaction, and reduces the production cost. The present invention also provides a post treatment process of the reaction mixture.


Patent
Ningbo Wanhua Polyurethanes Co. and Yantai Wanhua Polyurethanes Co. | Date: 2011-06-03

The present invention discloses a method for intermittently producing 4,4-diaminodicyclohexyl methane (H_(12)MDA) with a low amount of the trans-trans isomer thereof, which comprises: controlling the reaction process by stopping the reaction when, except for a solvent, the reaction solution comprises MDA of 0-5 wt % and H_(6)MDA of 1-20 wt %; and b) separating the reaction solution obtained from step a) by conventional means to obtain H_(12)MDA product with desired purity, and allowing the un-reacted material and intermediate product to be recycled to the reactor after being accumulated. The method of the present invention decreases the amount of the trans-trans isomer in H_(12)MDA, increases the yield of the reaction, and reduces the production cost. The present invention also provides a post treatment process of the reaction mixture.


Patent
Yantai Wanhua Polyurethanes Co. | Date: 2010-12-29

Disclosed is a rapid mixing reactor, comprising a first feed-in passage housing, a reactor housing, a second feed-in passage, a hollow blade-wheel feed distributor, a rotation shaft, and a first feed distributor, wherein the first feed-in passage housing and the reactor housing are constructed coaxially and communicated with each other; the second feed-in passage, the hollow blade-wheel feed distributor and the rotation shaft each are fixed in connection with each other in the sequence along the central axis of the reactor; the hollow blade-wheel feed distributor is located within the reactor housing and rotates axially under the driving force of the rotation shaft; the second feed-in passage is connected with the hollow blade-wheel feed distributor; the first feed-in passage housing is set up with at least one first feed-in inlet therein; the reactor housing is set up with at least one reaction liquid outlet at its distal end; and the first feed distributor and the hollow blade-wheel feed distributor are provided with first feed-in jetting hole(s) and second feed-in jetting hole(s), respectively. The reactor is capable of effecting instantaneously rapid mixing of two streams of fluid under a massive capacity, and improving the yield and quality of the target product.

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