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Chain depolymerization (also called unzipping or depropagation) is the sequential removal of monomers from the polymer chain ends. Chain scission reactions compete with crosslinking reactions, chain stripping of side groups as well as with substituent and cyclization reactions.

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PET can be depolymerized on various ways to yield monomers such as TPA, DMT, and bis-2-hydroxyethyl terephthalate (BHET) for the production of fresh polyester. Depolymerization agent classifies the depolymerization methods: methanolysis, glycolysis, hydrolysis, etc. EG is used for glycolysis of PET which yields BHET and oligomers.

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Thermal depolymerization (TDP) is a depolymerization process using hydrous pyrolysis for the reduction of complex organic materials (usually waste products of various sorts, often biomass and plastic) into light crude oil. It mimics the natural geological processes thought to be involved in the production of fossil fuels.

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Depolymerization of Lignin to Produce Monophenols and Oligomers Using a Novel Ni/Ce-CNT Catalyst. Qiaozhi Ma, a,b Qiyu Liu, a,b Xiaomeng Dou, a Wenzhi Li, a, * Wei Fan, b and Minghou Liu a. A novel composite catalyst consisting of nickel, cerium, and carbon nanotube (CNT) was developed for native lignin and industrial lignin depolymerization.

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Talk:Thermal depolymerization/Archive 1. Jump to navigation Jump to search. This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. Archive 1: Yield efficiency. The energy efficiency is not 85%. ...

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Download as PDF. For Information, Contact: Craig Forney ... rapid depolymerization of polylactic acid under moderate conditions has been demonstrated on a laboratory scale. ... This method—which uses simple compounds and moderate energy at a fast reaction speed—results in depolymerization of PLA at very high rates. As a consequence the ...

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Nikhil D. Patil, ... Ning Yan, in Lignin in Polymer Composites, 2016. 4 Model Compounds of Lignin. The depolymerization of lignin polymer into its lower molecular-weight oligomers and monomers is a remarkable approach to generate bulk chemicals and biofuels. However, the use of lignin as a precursor for the synthesis of polymeric materials is difficult.

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The study demonstrates the potential of oxidative depolymerization as a means of pretreatment toward the microbial conversion of technical lignin and is, to the best of our knowledge, the first integrated study exploring the parameter space of oxidative depolymerization and the resulting effect on lignin conversion by multiple bacterial species.

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Lignin depolymerization to monophenolic compounds in a flow-through system ... abstract, and list of authors), clicks on a figure, or views or downloads the full-text. ... Reductive lignin ...

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Depolymerization of the biopolymer chitosan by an autoclaving process at 121°C and 15 psi was investigated using various treatments. Acetic acid was found to be the most effective solvent in decreasing chitosan viscosity among the six organic acids tested. The rate of viscosity decrease increased with increasing chitosan concentration.

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Remodeling of the actin cytoskeleton is required for vasopressin (VP)‐induced aquaporin 2 (AQP2) trafficking. Here, we asked whether VP and forskolin (FK)‐mediated F‐actin depolymerization depends on AQP2 expression. Using various MDCK and LLC‐PK1 cell lines with different AQP2 expression levels, we performed F‐actin quantification and …

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Zirconium Incorporated Mesoporous Silicates Show Remarkable Lignin Depolymerization Activity Article in ACS Sustainable Chemistry & Engineering 5(8) · June 2017 with 308 Reads How we measure 'reads'

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Abstract. The efficiency of enzymatic depolymerization in a membrane reactor was investigated. The model analysis was performed on bovine serum albumin hydrolysis reaction led by three different enzymes, for which kinetic equations have different forms.

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Solvent-Free Olefin Metathesis Depolymerization of 1,4-Polybutadiene. Mark D. Watson, and Kenneth B. Wagener * George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200 ... Download Citation Email a …

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Feb 06, 2011· Download as PDF. Set alert. About this page. Learn more about Depolymerisation. ... Depolymerization is a tertiary recycling technique fundamentally stands for the conversion of a polymer chain into its monomer units along with oligomer with related formation of gaseous products. Glycolysis techniques are now recognized as innovative ...

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Sep 16, 2019· It can be transformed for the substitution of aromatic chemical-derived petrol as BTXs. The wide range of applications that it can be obtained from BTXs building blocks makes the selective depolymerization of lignin a great scientific challenge.

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A method for the depolymerization of polycarbonate waste by glycolysis using ethylene glycol without catalyst was explored in order to get the monomer bisphenol A (BPA).

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A very important topic in present-day research is the depolymerization of lignin, meaning the multi-parametric decomposition of the biopolymer into low-molecular-weight products (monomers) by breaking of the intermolecular bonds. Depolymerization can occur under many different factors, such as high temperature or catalysts, which determine the mechanism of disintegration.

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Depolymerization is a very common process. Digestion of food involves depolymerization of macromolecules, such as proteins. It is relevant to polymer recycling. Sometimes the depolymerization is well behaved, and clean monomers can be reclaimed and reused for making new plastic. In other cases, such as polyethylene, depolymerization gives a ...

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A. Hodzic, in Green Composites, 2004. 12.4.2 Chemical degradation and fibre recovery. Chemical degradation of composites involves partial or selective degradation of polyester/styrene polymer network in the presence of water, ethanol, potassium hydroxide and various amides. 27 This process is rather inferior when compared with the quality of grinding recyclate, as potassium …

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Improving in vitro lignin depolymerization may depend on future discoveries of novel enzymes active on β-ether bonds, such as the newly characterized NaGST NU (Kontur et al., submitted) used in this study, or the engineering of existing β-etherase enzymes to improve the range of β-ether-containing substrates they can utilize. Ultimately, the ...

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Lignin, a major component of lignocellulose, is the largest source of aromatic building blocks on the planet and harbors great potential to serve as starting material for the production of biobased products. Despite the initial challenges associated with the robust and irregular structure of lignin, the valorization of this intriguing aromatic biopolymer has come a long way: recently, many ...

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The present invention discloses a mild reaction conditions, the simple process of PET depolymerization process of a microwave with pure water as a depolymerizing agent, the amount of water and PET in a weight ratio of water :PET = 10:1 placed in a reactor, at a temperature of 220 ~ 230 ℃, under conditions of a pressure 2.0 ~ 2.5MPa, reaction was …

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Heterogeneous continuous kinetics modeling of PET depolymerization in supercritical methanol Article in Journal of Supercritical Fluids The 52(3):266-275 · April 2010 with 84 Reads

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Highly Selective Oxidation and Depolymerization of α,γ‐Diol‐Protected Lignin. Dr. Wu Lan. Laboratory of Sustainable and Catalytic Processing, Institute of Chemical Sciences and Engineering, École polytechnique fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland ... $38 Full Text and PDF Download. Learn more Check out. You ...

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The process development unit (PDU) test program is part of an ongoing effort at the Energy & Environmental Research Center (EERC) to expand the base of knowledge for the thermal depolymerization of plastics process. This phase of the development effort, initiated after successful completion of a bench-scale program, has concentrated on maximizing liquid yield.

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Scrap tires in three forms—crumb rubber 60 minus mesh, crumb rubber 20 minus mesh, and buffed rubber—were subjected to depolymerization and devulcanization by applying heat, high shear, and a combination of both.

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Aug 09, 2019· Polymers that depolymerize end-to-end upon cleavage of their backbones or end-caps, often termed “self-immolative” polymers (SIPs), have garnered significant interest in recent years. They can be distinguished from other degradable and stimuli-responsive polymers by their ability to provide amplified responses to stimuli, as a single bond cleavage event is translated into the release of ...

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Full Article. Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol. Daliang Guo, a,b,c,d Bei Liu, e,f Yanjun Tang, a Junhua Zhang, a XinXing Xia, a,g, * and Shuhua Tong g, * The effects of reaction parameters on catalytic depolymerization of alkali lignin in sub- and super-critical ethanol were investigated using a high pressure autoclave, and the liquid oil and solid ...

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The invention relates to a process for the production of caprolactam by thermal depolymerization of polyamide in the presence of small quantities of potassium carbonate at 250° to 320° C. and to a process for purifying the resulting caprolactam. ... Download PDF Info

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