Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Morita, N.; Wajima, Takaaki; Nakagome, H.

doi:10.7763/ijcea.2015.v6.493

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…It has also been reported in a study on the thermal degradation of ABS that the use of a half-batch reactor results in the enrichment of the contained brominated flame retardants into residual carbon [24]. We reported that HT addition in the pyrolysis of brominated plastics reduced the content of bromine compounds in the product oil [27]- [29]. The effect of HT addition with different elemental composition ratios in the pyrolysis of brominated polystyrene was also reported [30].…”

Section: Influence and Effect Of Pyrolysis With Additives In Tantalum...supporting

confidence: 61%

Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors

Shimizu,

Hanazawa,

Morita

2022

IJESD

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In recent years, the demand for tantalum capacitors has been increasing due to the miniaturization of electronic devices. Tantalum capacitors, which use the rare metal tantalum as the capacitor element, are used in electronic devices such as cell phones because they are smaller and have a higher capacity than conventional capacitors. In Japan, there are reports that minerals containing rare elements are being extracted from discarded electronic and electrical equipment to produce medals for the 2020 Tokyo Olympics. In Japan, many used electrical products containing rare elements are discarded, and these metals are called urban mines. The tantalum contained in tantalum capacitors accounts for 40% of the total mass of the sintered material and is expected to be recycled from discarded products. However, tantalum capacitors are covered with a hard mold resin of acrylonitrile-butadiene-styrene (ABS) resin, which is chemically and physically stable. However, due to its nature, ABS resin is difficult to destroy and has not been recycled. In this study, hydrotalcite (HT) (Mg6Al2(OH)16CO3・MH2O) was used to extract tantalum from the sintered tantalum capacitor by pyrolysis. HT was added to the tantalum capacitor and placed in a metal reactor and subjected to pyrolysis at 550℃ in nitrogen to determine if the sintered tantalum was susceptible to fracture. It is presumed that the bromine gas generated from the ABS resin of the tantalum capacitor was trapped by the HT and the mold resin of the capacitor became residual carbon.

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Section: Influence and Effect Of Pyrolysis With Additives In Tantalum...supporting

confidence: 61%

Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors

Shimizu,

Hanazawa,

Morita

2022

IJESD

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“…Another study examined the thermal decomposition of tetrabromobisphenol A, a brominated flame retardant, in the presence of a zeolite catalyst (ZSM-5 or Y-type zeolite), whereby the latter catalyst was more effective in removing the bromine compound [27]. We previously reported that it was possible to reduce the content of bromine in the oil produced upon thermal decomposition of brominated polystyrene by using hydrotalcite (HT) additive [33]. HT is a layered double hydroxide consisting of a metal complex hydroxide comprising anionic species in the divalent Mg 2+ and trivalent Al 3+ host layers and interlayer of the guest layer [34], [35].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics

Morita¹,

Nakayasu²,

Wajima³

et al. 2016

IJCEA

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Abstract-In this study, a method is presented to reduce the halogen concentration in the oil produced upon pyrolysis of acrylonitrile-butadiene-styrene (ABS) resins containing brominated flame retardants. More specifically, hydrotalcite was added to a predetermined amount of ABS in a glass reactor, and subjected to pyrolysis at 400 °C in nitrogen atmosphere. The bromine content in the product oil, residue, and gas released upon pyrolysis was analyzed. The main components of the product oil following pyrolysis of ABS in the absence of hydrotalcite additive were toluene, ethylbenzene, styrene, 1-bromomethyl-4-methylbenzene, phenol, n-butyl benzene, 1-methoxy-1-methylethyl benzene, and bromine compounds 2-bromophenol, 4-benzyloxy bromobenzene, 2,6 dibromophenol, and 2-bromotoluene. In contrast, the content of bromine in the product oil decreased when hydrotalcite was added to ABS. Moreover, negligible amounts of bromine were detected when the amount of added hydrotalcite was greater than 8 g. The reduced content of bromine in the product oil was attributed to the efficient trapping of bromine in the hydrotalcite matrix (as determined by the content of bromine in the residue).

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“…The yield of product oil was improved to 96% from 93% when the zeolite catalysts, H-USY or H-Beta, were used in a steam contact process for pyrolysis [27]. The content of the bromine compounds in the product oil was decreased by adding hydrotalcite (HT) in the pyrolysis of brominated plastic [28][29][30]. HT is composed of layers of hydroxides that can form a metal complex hydroxide, containing anionic hosts and Mg 2+ and Al 3+ interlamellar guests [31,32].…”

Section: Introductionmentioning

confidence: 95%

Effect of the Bromine-Based Flame Retardant Plastic Pyrolysis of Hydrotalcite

Morita

Kawabata

Wajima

et al. 2016

MATEC Web of Conferences

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Abstract. In this study, a method is presented to decrease halogen compounds in the product oil from thermolysis of polystyrene and polypropylene mixed plastic spiked with tetrabromobisphenol A. A mixture of hydrotalcite and plastic was pyrolyzed in a glass reactor at 400 °C under a nitrogen atmosphere. Bromine compounds in the residual substances were measured. The yield of product oil increased using hydrotalcite as an additive. The bromine compounds that were the major ingredients in the oil after thermolysis at 400 °C from the mixed plastic, which also included toluene, ethyl benzene, styrene, and 1-methylethyl benzene, were 2-bromohexane, 3-bromo-1-propenyl benzene, 4,5-dibromodecane, 1-bromomethylbenzene, 3-bromophenol, and 4-bromo-2,6-dimethylbenzaniline. However, bromine compounds were not detected in the product oil, residue, or gas when hydrotalcite was added. After the thermolysis of the plastic, bromine compounds in the product oil may decrease because bromine was captured by the added hydrotalcite.

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Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Cited by 4 publications

References 32 publications

Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors

Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors

Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics

Effect of the Bromine-Based Flame Retardant Plastic Pyrolysis of Hydrotalcite

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