scholarly journals Baseline Data of Low-Density Polyethylene Continuous Pyrolysis for Liquid Fuel Manufacture

Recycling ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 2
Author(s):  
Aleksandr Ketov ◽  
Vladimir Korotaev ◽  
Natalia Sliusar ◽  
Vladivir Bosnic ◽  
Marina Krasnovskikh ◽  
...  
Keyword(s):  
Liquid Fuel ◽  
Pyrolytic Carbon ◽  
Poor Quality ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polymer Waste ◽  
Bio Oil ◽  
Heating Oil ◽  
Small Parts

The recycling of end-of-life plastics is a problem, since small parts can be returned into circulation. The rest is burned, landfilled or recycled into low-quality heating oil by pyrolysis methods. The disadvantages of this method are the need to dispose the formed by-product, pyrolytic carbon, the poor quality of produced liquid fuel and the low productivity of the method associated with the periodicity of the process. In this work, methods of thermogravimetry and chromatography–mass spectrometry (GC-MS) have been used to study the co-pyrolysis products of low-density polyethylene (LDPE) and oxygen-containing substances at the pressures of 4–8 MPa and temperatures of 520–620 °C. Experiments have highlighted the conditions needed for producing of high-quality liquid fuel. Initial data have been prepared for the design of a continuous pyrolysis reactor to dispose polymer waste for the production of bio-oil which would be available to enter the petrochemical products market.

scholarly journals Photo-selective shade nets on the production and quality of sugarcane plantlets

2019 ◽  
Vol 23 (5) ◽  
pp. 366-371 ◽  
Author(s):  
José J. F. Cordeiro Júnior ◽  
Héliton Pandorfi ◽  
José A. D. Barbosa Filho ◽  
Alex S. Moraes ◽  
Luiz A. de Almeida Neto ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Substrate Temperature ◽  
Principal Component ◽  
Global Solar Radiation ◽  
Saccharum Officinarum ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Randomized Design ◽  
Completely Randomized Design

ABSTRACT Brazil is the world’s largest producer of sugarcane (Saccharum officinarum L.) and research aimed at propagation has promoted higher quality in production. The objective of this study was to investigate the effect of the variation of micrometeorological elements on the survival and quality of pre-sprouted sugarcane plantlets. The study was carried out in a protected environment (UFRPE). Plantlets of the cultivar RB92579 were obtained by the technique of production of pre-sprouted plantlets. The protected environments were divided into four modules covered with low-density polyethylene plastic + photo-selective shade nets and one module without shade net. Micrometeorological data of global and photosynthetically active solar radiation, air temperature, substrate temperature, relative humidity and the solar radiation spectrum were recorded in each module. The experiment was conducted in a completely randomized design and the principal component analysis was used to verify the association between the cultivation modules, micrometeorological variables and crop variables. Anti-UV low-density polyethylene plastic + freshnet led to lower transmittance of global solar radiation, higher percentage of photosynthetically active radiation and lower plantlet mortality. Substrate temperature above 30.2 °C resulted in higher plantlet mortality. Larger spectrum in the red range led to the production of better quality plantlet. The use of freshnet shade net promoted adequate conditions for the cultivation of sugarcane plantlets and allows obtaining better quality plantlets.

scholarly journals The Effect of Polymer Waste Addition on the Compressive Strength and Water Absorption of Geopolymer Ceramics

2021 ◽  
Vol 11 (8) ◽  
pp. 3540
Author(s):  
Numfor Linda Bih ◽  
Assia Aboubakar Mahamat ◽  
Jechonias Bidossèssi Hounkpè ◽  
Peter Azikiwe Onwualu ◽  
Emmanuel E. Boakye
Keyword(s):  
Public Health ◽  
Compressive Strength ◽  
Fracture Surface ◽  
Water Absorption ◽  
Chemical Bonding ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polymer Waste ◽  
Pull Out

The quantity of polymer waste in our communities is increasing significantly. It is therefore necessary to consider reuse or recycling waste to avoid an increase in the risk to public health. This project is aimed at using pulverized low-density polyethylene (LDPE) waste as a source to reinforce and improve compressive strength, and to reduce the water absorption of geopolymer ceramics (GC). Clay:LDPE composition consisting of 5%, 10%, and 15% LDPE was geopolymerized with an NaOH/Na2SiO3 solution and cured at 30 °C and 50 °C. Characterization of the geopolymer samples was carried out using XRF and XRD. The microstructure was analyzed by SEM and chemical bonding by FTIR. The SEM micrographs showed LDPE particle pull-out on the geopolymer ceramics’ fracture surface. The result showed that the compressive strength increases with the addition of pulverized polymer waste compared to the controlled without LDPE addition. Water absorption decreased with an increase in LDPE addition in the geopolymer ceramics composite.

scholarly journals Vida útil de polpa congelada de araticum embalada ou não a vácuo

2019 ◽  
Vol 6 (1) ◽  
pp. 114-121
Author(s):  
Cristiane Maria Ascari Morgado ◽  
Ana Paula Silva Siqueira ◽  
Eli Regina Barboza de Souza ◽  
Annelisa Arruda de Brito ◽  
Luis Carlos Cunha Junior ◽  
...  
Keyword(s):  
Titratable Acidity ◽  
Soluble Solids ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Antioxidant Power ◽  
Total Antioxidant ◽  
Ferric Reducing Antioxidant Power ◽  
Annona Crassiflora

The objective of this work was to evaluate the role of two types of conditioning process in quality of frozen and stored araticum’s pulp at -18ºC. The fruits were collected at pre-maturing developmental stage, packed into boxes wrapped with bubble plastic, transported to the laboratory and stored for 7 days at 22ºC and 90% RH to complete the maturation. Afterwards, they were pulped and the pulp was stored in: 1) low-density polyethylene packages (LDPE) 60 micro, hermetically packed in a sealing machine or 2) low-density polyethylene packages (LDPE) 60 micro vacuum sealed. Those units were frozen at -18ºC for 402 days and were evaluated at processing day and at 30; 90; 150; 210 and 402 days of storage, for soluble solids contents (SS), titratable acidity (TA), SS/TA, ascorbic acid, total extractable polyphenols and total antioxidant activity using the Ferric Reducing Antioxidant Power (FRAP) method. The results were submitted to an analysis of variance and the means were each other compared using Tukey test with Sisvar software. It is conclued that is not necessary the use of vacuum to package the frozen araticum’s pulp for 402 days, at -18ºC. Keywords: Annona crassiflora Mart, freezing, vacuum.  

Polyethylene-coated carton wraps to reduce the deterioration in internal quality of eggs

1973 ◽  
Vol 13 (62) ◽  
pp. 257
Author(s):  
RJ Hughes
Keyword(s):  
Storage Temperature ◽  
Low Density Polyethylene ◽  
Internal Quality ◽  
Low Density ◽  
Ambient Temperatures

Deterioration in the internal quality of unwashed eggs was reduced when eggs packed in cartons enclosed in paper wraps coated with 0.013 mm of low density polyethylene were compared with eggs packed in unenclosed cartons. During storage at 12.8�C, the reduction in deterioration was slight, but statistically significant, after four days and somewhat greater after eight days. A storage temperature of 23.9�C, simulating ambient temperatures during summer months (December-February) differences after both four and eight days.

scholarly journals Organizational risks of ensuring the reliability of turbine units at TPP and NPP

2020 ◽  
Vol 13 (3) ◽  
pp. 207-217
Author(s):  
A. I. Kumenko
Keyword(s):  
Training Programs ◽  
Poor Quality ◽  
Foreign Firms ◽  
High Tech ◽  
Repair Work ◽  
Scientific Schools ◽  
Systemic Risks ◽  
The Russian Federation ◽  
Small Parts

The problems and tasks that need to be systemically solved during the operation, adjustment and repair of hightech power equipment (PE) are considered. The main reasons for the deterioration in the quality of repair work are stated. It is noted that the destruction of repair trusts has led to the absence of a systemic approach to repair structures as part of energy systems. The lack of funding for applied science led to the disappearance of scientific schools. All other structures (generation, flow control) are combined and organized. As for repair structures, they were divided after the liquidation of the repair trusts, split into small parts and are virtually uncontrollable, both technically and organizationally. There is a lack of training for specialists in repair and adjustment of PE in the Russian Federation. Today, not a single university trains the required number of specialists in such important areas as installation, repair, commissioning and diagnostics. The number and quality of specialists, for example, at turbine departments of universities do not match the scope of tasks that must be solved today in the design and creation of high-tech equipment. It is shown that a decrease in reliability also takes place during the supply of imported equipment. Examples of loss of performance of equipment manufactured by foreign firms are given. It is noted that the non-compliance of the specialist training programs with today’s requirements already leads to errors in the management of the repair and operation processes. Insufficient attention in the field of training and retraining of specialists, poor-quality training programs and the absence of top-class specialists at departments, who could be able to set and solve urgent problems of the industry, carry the greatest systemic risks. The formulated systemic risks will sooner or later lead to an irreparable situation. These risks can only be reduced only by paying serious attention to the aforesaid problems over the next 5 – 10 years, and by restoring, at least partially, the potential of the leading departments. For most of the above problems, recommendations and proposals for solving the same are presented.

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