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SCG Chemicals Co., Thai Plastic and Chemicals Public Co. | Date: 2017-01-04

The invention relates to a plasticizer composition comprising a terephthalic acid di-ester and an ester having the following formula (I):_(1) and R_(2) are the same or different and represent a straight chain, branched or cyclic hydrocarbyl group. R_(1) and R_(2) in formula (I) have from 1 to 15 carbon atoms. The invention further relates to a polymer composition comprising a plasticizer composition comprising a terephthalic acid di-ester and an ester having the following formula (I).


Wittanadecha W.,Chulalongkorn University | Laosiripojana N.,King Mongkut's University of Technology Thonburi | Ketcong A.,Thai Plastic and Chemicals Public Company Ltd | Ningnuek N.,Thai Plastic and Chemicals Public Company Ltd | And 3 more authors.
Applied Catalysis A: General | Year: 2014

In the present work, the catalytic performance of Au/C catalysts prepared by ultrasonic-assisted, microwave-assisted and incipient wetness impregnation techniques for the hydrochlorination of acetylene to vinyl chloride monomer (VCM) was studied. The catalyst prepared by the ultrasonic-assisted technique significantly exhibited enhanced acetylene conversion activity and selectivity to VCM over a period of 20 h of evaluation. The effect of gold loading on catalyst performance was determined, from which 1% Au was found to be the optimum loading compared to 0.5% and 2.0% loading. Importantly, the effect of different catalyst pretreatments (i.e. with and without H2/HCl and HCl purging prior to the reaction testing) on the catalytic performance was also identified. The use of different pretreatment procedures affects only the initial activity of catalyst, while the long-term activities of catalyst with different pretreatments are almost identical. © 2014 Elsevier B.V.


Wittanadecha W.,Chulalongkorn University | Laosiripojana N.,King Mongkut's University of Technology Thonburi | Ketcong A.,Thai Plastic and Chemicals Public Company Ltd | Ningnuek N.,Thai Plastic and Chemicals Public Company Ltd | And 2 more authors.
Engineering Journal | Year: 2014

In the present work, the ultrasonic-assisted technique is applied to synthesize Au/C catalysts for vinyl chloride monomer (VCM) production via acetylene hydrochlorination. The catalytic performance of the obtained catalysts is compared with that of the catalyst prepared by a conventional incipient wetness impregnation technique. It was found that all the prepared catalysts show high VCM selectivity (>99.5%). The use of the ultrasonic-assisted technique can significantly improve the catalytic activity and stability of the synthesized Au/C catalysts. An ultrasonic driven time of 6 hours is found to be a promising catalyst for commercial application regarding the catalyst stability. In addition, the effect of operating parameters is investigated. Suitable operating temperature and HCl/C2H2 feed ratio are 180°C and 1.1, respectively.


Wittanadecha W.,Chulalongkorn University | Laosiripojana N.,King Mongkut's University of Technology Thonburi | Ketcong A.,Thai Plastic and Chemicals Public Company Ltd | Ningnuek N.,Thai Plastic and Chemicals Public Company Ltd | And 3 more authors.
Reaction Kinetics, Mechanisms and Catalysis | Year: 2014

The comparison of microwave-assisted catalyst preparation techniques with conventional impregnation (CI sample) and the effect of drying condition for Au/C catalysts have been studied using XPS, XRD, and STEM methods. The catalytic activity for vinyl chloride monomer (VCM) production via acetylene hydrochlorination is the highest for catalysts using optimal conditions of microwave drying. Drying times affect both initial and pseudo-steady state activities; microwave drying for 0.5 min gave an optimum balance of residual surface Au3+ species and the smallest Au particle sizes. For all catalysts, the selectivity to VCM was >99.5 %, with 1,2-dichloroethane being the only by-product. Acetylene conversions for MW-S (0.5 min) and MW-L (2.0 min) samples are greater than that of the CI sample. The initial activity (0-2 h) for acetylene conversion was the highest for the CI sample and is related to the amount of Au3+ on the surface (XPS results) in the following order: CI > MW-S > MW-L. The amount of Au3+ on the surface catalyst affects only the initial activity whilst the pseudo-steady state conversions are promoted by the higher concentrations of active gold species obtained for the smaller Au particles, and follows the trend MW-S > MW-L > CI. The reasons for catalytic deactivations of this reaction appear to be linked to both the reduction of active Au sites to Au0 and the subsequent gold aggregation. © Akadémiai Kiadó, Budapest, Hungary 2014.

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