Effects of Temperature on Catalytic Hydrolysis of PET by Zinc Sulfate under Microwave Irradiation

2011 ◽  
Vol 233-235 ◽  
pp. 1628-1631 ◽  
Author(s):  
Qing Hua Tang ◽  
Yong Shuai Ma ◽  
Dong Zhang
Keyword(s):  
Microwave Irradiation ◽  
Polyethylene Terephthalate ◽  
Reaction Temperature ◽  
Terephthalic Acid ◽  
Zinc Sulfate ◽  
Influencing Factor ◽  
Catalytic Hydrolysis ◽  
Different Temperatures ◽  
Effects Of Temperature ◽  
Hydrolysis Of

The effects of different temperatures on catalytic hydrolysis of polyethylene terephthalate(PET) by zinc sulfate as a catalyst under microwave irradiation were studied, and in the meantime, the relation between the depolymerization rate of PET and the yield of terephthalic acid(TPA) under the same temperature was investigated. The results suggested that the reaction temperature was an important influencing factor for the depolymerization reaction of PET, and the concentration of depolymerization product TPA and the depolymerization rate of PET became coherence under the same temperature.

Catalytic Effects of Super Acid SO42-/γ-Al2O3 to PET Depolymerization under Microwave Irradiation

2012 ◽  
Vol 550-553 ◽  
pp. 280-283 ◽  
Author(s):  
Hong Mei Yan ◽  
Yong Shuai Ma ◽  
Wei Lu Zhang ◽  
Dong Zhang
Keyword(s):  
Reaction Time ◽  
Microwave Irradiation ◽  
Polyethylene Terephthalate ◽  
Catalytic Hydrolysis ◽  
Whole Process ◽  
Morphology Analysis ◽  
Different Temperatures ◽  
Super Acid ◽  
Catalytic Effects ◽  
Hydrolysis Of

The effects of different temperatures on catalytic hydrolysis of polyethylene terephthalate(PET) by solid super acids SO42-/γ-Al2O3as a catalyst under microwave irradiation were studied, and in the meantime, the morphology analysis of the undepolymerized PET under the same temperature was investigated by SEM. The results indicate that the depolymerization rate of PET is seriously influenced by reaction time and temperature. The depolymerization mechanism is changed by the solid super acid SO42-/γ-Al2O3, and the depolymerization rate is higher than that of with no catalyst in the whole process of reaction.

Hydrolysis of waste polyethylene terephthalate catalyzed by easily recyclable terephthalic acid

2021 ◽  
Vol 135 ◽  
pp. 267-274
Author(s):  
Weisheng Yang ◽  
Rui Liu ◽  
Chang Li ◽  
Yang Song ◽  
Chaoquan Hu
Keyword(s):  
Polyethylene Terephthalate ◽  
Terephthalic Acid ◽  
Waste Polyethylene ◽  
Hydrolysis Of

Tungsten-promoted titania as solid acid for catalytic hydrolysis of waste bottle PET in supercritical CO2

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 43171-43184
Author(s):  
Wen-Ze Guo ◽  
Hui Lu ◽  
Xue-Kun Li ◽  
Gui-Ping Cao
Keyword(s):  
Hydrothermal Method ◽  
Polyethylene Terephthalate ◽  
Supercritical Co2 ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Catalytic Hydrolysis ◽  
Hydrolysis Of

Tungsten-promoted titania solid acid catalysts were synthesized by a hydrothermal method and used in the hydrolysis of waste bottle polyethylene terephthalate (PET) in supercritical CO2.

Study on the Synthesis of Ethylene Glycol by Catalytic Hydrolyze of Ethylene Carbonate

2014 ◽  
Vol 989-994 ◽  
pp. 79-82
Author(s):  
Min Zhang
Keyword(s):  
Reaction Time ◽  
Ethylene Glycol ◽  
Influencing Factors ◽  
Reaction Temperature ◽  
Mass Fraction ◽  
Ethylene Carbonate ◽  
Catalytic Hydrolysis ◽  
Optimal Conditions ◽  
Reaction Products ◽  
Hydrolysis Of

The process for ethylene glycol (EG) by catalytic hydrolysis of ethylene carbonate (EC) was studied. The influencing factors of the reaction products were studied which include the reaction temperature, the mole ratio of H2O to EC, the mass fraction of the catalyst and the reaction time. The optimal conditions were identified as follows: the reaction temperature is 140-145°C, n (H2O) :n (EC) = 2.0-2.5 : 1, the catalyst of Al2O3is about 2.0wt%, the reaction time is about two hours. Under the above conditions, EC can be completely hydrolyzed and the selectivity of EG is above 98%.

scholarly journals Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 504
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Consuelo Arellano
Keyword(s):  
Activated Carbon ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Methanesulfonic Acid ◽  
Biofuel Production ◽  
Acid Catalysts ◽  
Effects Of Temperature ◽  
Carbon Catalysts ◽  
Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

scholarly journals The effect of drying temperature on the properties of gelatin from carps (Cyprinus carpio) skin

2019 ◽  
Vol 37 (No. 4) ◽  
pp. 246-251 ◽  
Author(s):  
Joanna Tkaczewska ◽  
Maciej Wielgosz ◽  
Piotr Kulawik ◽  
Marzena Zajac
Keyword(s):  
Cyprinus Carpio ◽  
Freeze Drying ◽  
Treatment Method ◽  
Thermal Hydrolysis ◽  
Gel Properties ◽  
Drying Temperature ◽  
Freeze Dried ◽  
Different Temperatures ◽  
Pre Treatment ◽  
Hydrolysis Of

The influence of drying temperature on the characteristics and gel properties of gelatine from Cyprinus carpio L. skin was studied. Gelatine was extracted from the carp skin using NaOH and ethanol pre-treatment method, extracted in water in 45°C and then dried in 4 different temperatures: 50, 70, 80°C and freeze-dried. The  electrophoresis and functional properties of gelatines were investigated. Freeze drying allowed to obtain a high gelling force, and all other methods did not give satisfactory results. The proteins in gelatines dried at higher temperatures separated by electrophoresis gave severely blurred bands. It may be explained by thermal hydrolysis of collagen fibrils. Freeze drying is the only effective method for drying this product, which can be used in industry.

Hydrogen Generation by Hydrolysis of the Ball Milled Al-C-KCl Composite Powder in Distilled Water

2012 ◽  
Vol 519 ◽  
pp. 87-91 ◽  
Author(s):  
Xia Ni Huang ◽  
Zhang Han Wu ◽  
Ke Cao ◽  
Wen Zeng ◽  
Chun Ju Lv ◽  
...  
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Fine Particle ◽  
Composite Powder ◽  
Hydrogen Generation ◽  
Aluminum Particle ◽  
Generation Rate ◽  
Composite Powders ◽  
Fine Particle Size ◽  
Hydrolysis Of

In the present investigation, the Al-C-KCl composite powders were prepared by a ball milling processing in an attempt to improve the hydrogen evolution capacity of aluminum in water. The results showed that the hydrogen generation reaction is affected by KCl amount, preparation processing, initial aluminum particle size and reaction temperature. Increasing KCl amount led to an increased hydrogen generation volume. The use of aluminum powder with a fine particle size could promote the aluminum hydrolysis reaction and get an increased hydrogen generation rate. The reaction temperature played an important role in hydrogen generation rate and the maximum hydrogen generation rate of 44.8 cm3 min-1g-1of Al was obtained at 75oC. The XRD results identified that the hydrolysis byproducts are bayerite (Al(OH)3) and boehmite (AlOOH).

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