Acetic acid production from the hydrothermal transformation of organics in waste liquid crystal display panels

Yu, Luling; Zhuang, Xuning; Bai, Lan; Feng, Liang; He, Wenzhi; Li, Guangming; Huang, Juwen

doi:10.1016/j.jclepro.2015.11.056

Cited by 24 publications

(14 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Proposed decomposition pathways of organics in packaging material are shown in Figure , which was partly suggested by former studies. ,, HO 2 • may be generated by H 2 O 2 (H 2 O 2 → H 2 O + O 2 , H • + O 2 → HO 2 • ), which is a highly oxidative free radical. This radical can promote the degradation of organic macromolecules and even could further break the benzene rings .…”

Section: Resultsmentioning

confidence: 77%

“…OH – which dissociates from phosphate buffer system (HPO 4 2– + H 2 O ↔ H 2 PO 4 – + OH – ) can undergo a nucleophilic substitution reaction with the Br-containing organic substances to convert the organic bromine to inorganic bromine. , It has been pointed out in the literature that the OH – also accelerates the ring opening of benzene rings. , More importantly, the OH – provided by the phosphate buffer can neutralize the acid generated during the hydrothermal degradation of the organic materials, so that the pH of the hydrothermal solution was stably maintained at about 6. Thus, the loss of arsenic and gallium caused by the GaAs being corroded by acidic hydrothermal solution was avoided . Therefore, both Na + and OH – ions provided by the phosphate buffer system, through different paths, accelerate the degradation of organic components in packaging materials.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the loss of arsenic and gallium caused by the GaAs being corroded by acidic hydrothermal solution was avoided. 38 Therefore, both Na + and OH − ions provided by the phosphate buffer system, through different paths, accelerate the degradation of organic components in packaging materials. Meanwhile, the OH − plays an irreplaceable role in the recovery of GaAs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Recycle Technology for Recovering Gallium Arsenide from Scraped Integrated Circuits

Zhan

Zhang

Ahmad

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

From the environmental safety and resource recovery viewpoint, a novel method of recycling gallium arsenide (GaAs) from scrapped GaAs-based integrated circuits (ICs) was proposed in this study. A hydrothermal-buffering method (HBM) has been developed in which an oxidant (H2O2) in the presence of phosphate buffer solution reacted with ICs under hydrothermal conditions. The results have shown that the packaging material was effectively decomposed without any significant loss of GaAs under the HBM condition. Gallium and arsenic recovery rates were 99.9 and 95.5%, respectively. In addition, thermodynamically stable regions of Ga and As species in aqueous systems were identified by an Eh–pH diagram. The function of HBM has been studied and discussed in detail. Results have shown that Na+ and OH– ions provided by a buffer system accelerate the degradation of packaging materials. Meanwhile, the OH– plays an irreplaceable role in the recovery of GaAs. The states of As on the surface of the recovered GaAs were mainly positively trivalent and pentavalent, and the corresponding compounds were As2O3 and Na2HAsO4, respectively. Under optimum conditions, without releasing any toxic gases to the environment, 91.2% of the packaging materials were decomposed, probably the free radical reaction being the main mechanism; the probable decomposition pathways of packaging materials were investigated. The study provides an efficient and environmentally friendly process to treat the IC packaging material and recover maximum GaAs for further use.

show abstract

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Recycle Technology for Recovering Gallium Arsenide from Scraped Integrated Circuits

Zhan

Zhang

Ahmad

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…At the end of the production of the acetic fermented product, other short chain fatty acids were analyzed and quantified, such as butyric acid and propionic, being run 14, employing stirred method at 350 rpm, the assay with the highest production of those acids: butyric acid (0.1 to 15 g L -1 ) and propionic (0.9 to 13 g L -1 ), justifying the considerable ethanol consumption at the end of 28 days. According to Yu et al (2016), during ethanol oxidation into AA, due to some thermal instability, the production of other organic compounds may occur, such as other acids and ketones, which may be undesirable to the process, because they can alter the AA properties as well as produce esters that can also alter the process.…”

Section: Acetic Fermentation Oxidationmentioning

confidence: 99%

Cheese whey permeate valorization using sequential fermentations: case study performed in the Western Region of Paraná

Maestre¹,

Passos²,

Triques³

et al. 2021

RSD

View full text Add to dashboard Cite

Sooro Renner Nutrição S.A. company is found in the Western Region of Paraná/Brazil, which is highlighted nationally and in Latin America concerning the production of whey protein concentrate (WPC). During the production of WPC, performed in ultrafiltration membranes, the subproduct cheese whey permeate (CWP) is generated, which is rich in nutrients, such as lactose, minerals, and vitamins. This subproduct is reported as a potential culture medium to grow microorganisms. Thus, this research, performed in partnership with the Sooro company, aimed to develop biotechnological products employing sequential fermentations to fully use this subproduct bioconverting the ethanol obtained from CWP into vinegar employing the acetic bacterium Acetobacter aceti and different methods - Orleans, aerated, and stirred. The biotransformation into ethanol was performed by Kluyveromyces marxianus (alcoholic fermentation step) using a 2³ factorial experimental design to investigate the influence of lactose concentration, temperature, and pH. The maximum ethanol production was 47.18±0.05 g L-1, employing the conditions 88 g L-1 of lactose, 29 °C, and pH 4.5 in 45 h. Besides ethanol, probiotic cellular biomass, prebiotic galacto-oligosaccharides, and organic acids were also produced. In the oxidation stage, the Orleans method presented the best production: 42.30±0.08 g L-1 of acetic acid in 21 days. After this production, reductions of chemical oxygen demand and biochemical oxygen demand of the CWP were 60 and 65%, respectively. The results showed the great potential of CWP as a fermentation medium to obtain biotechnological products as a rentable and viable alternative to fully use CWP.

show abstract

“…Acetic acid is one of main and stable intermediates during hydrothermal oxidation of organics [1], which contributes it to be the target product for organic waste utilization [20]. Acetamide is widely used in various industries and plays an important role in our daily life.…”

Section: Introductionmentioning

confidence: 99%

Research and Mechanism of Two-step Preparation of Acetamide from Microalgae under Hydrothermal Conditions

Jiang

Ye²,

Zhou

et al. 2020

E3S Web Conf.

View full text Add to dashboard Cite

A two-step synthesis of acetamide under hydrothermal condition from microalgae, is presented. results showed that the best yield of acetamide and selectivity of acetic acid were 9.5 % and 60.1 % at 320 ℃ for 8 min with a NH3 supply of 30. Algae such as spirulina, cyanobacteria and autotrophic chlorella could also acquire acetamide, and lactic acid was found to be an important intermediate during the exploration of reaction pathways. These results demonstrated that it is possible to develop a process for conversion of microalgae biomass into acetamide.

show abstract

Acetic acid production from the hydrothermal transformation of organics in waste liquid crystal display panels

Cited by 24 publications

References 31 publications

Novel Recycle Technology for Recovering Gallium Arsenide from Scraped Integrated Circuits

Novel Recycle Technology for Recovering Gallium Arsenide from Scraped Integrated Circuits

Cheese whey permeate valorization using sequential fermentations: case study performed in the Western Region of Paraná

Research and Mechanism of Two-step Preparation of Acetamide from Microalgae under Hydrothermal Conditions

Contact Info

Product

Resources

About