Vol.11 no.3 2019

Research paper : High-value materials from incineration residues of burnable garbage (N. FUKAYA et al.)−132−Synthesiology - English edition Vol.11 No.3 (2018) 2 Collaboration with human resources of different eldsComment (Keiichi Ikegami)“When research results progress to the next stage, collaboration with human resources with different specialties is important” is indeed an important point. I think it will increase interest of the readers if you explain more specifically “the collaboration with human resources with different specialties” in each subchapter.Answer (Norihisa Fukaya)I added a text in “Subchapter 1.2 Scenario of this research” as follows: “Since the field of specialties were totally different among the specialists who had the knowledge of plant operation for waste disposal plant at Mitsui E&S, the researchers working on chemical reaction and molecular design at the Interdisciplinary Research Center for Catalytic Chemistry, AIST, and the researchers studying chemical engineering or surface chemistry at the Research Institute for Chemical Process Technology, AIST, there was no opportunity for these people to directly exchange opinions in usual activities such as at academic meetings or at paper presentations. … Therefore, events such as the Techno Bridge Fair at which AIST’s technological potential is introduced to the people of industry are important, so they can get an overview of the research conducted at AIST and to transmit the results widely and systemically. Looking back, it can be said that the breakthrough point of this research was the matchmaking between the ‘seeds’ and ‘needs’ of the specialists from totally different fields, and the fact that they were able to start joint research to tackle new topics.”3 Relationship of the elemental technologiesComment (Naoto Kobayashi)The intent of “2.4 Outline of the NEDO Project ‘Development of the manufacturing process technology for organic silicon functional chemical products’” is the production of tetraalkoxysilane from silica, and it does not necessarily contribute to the production of “silica with high specic surface area” that was included in the subtitle of the first draft. “3 Manufacturing of high added-value materials from molten slag raw materials” is the only contribution to the subtitle. If you intend to describe the results of both elemental technologies, you should change the subtitle and the research objective, and if the former is contributing greatly to the latter, you should describe their relationship.Answer (Norihisa Fukaya)As you indicated, I changed the subtitle so the focus will include the course from molten slag to tetraalkoxysilane (key material of silicon chemical industry). To clarify their relationship, I added a text to the end of Subchapter 3.1 as follows: “Also, silica with high specific surface area will have many reaction points that can come in contact with reaction targets such as alcohol or alkaline catalysts. Therefore, when considered as the raw material for chemical reactions, it is expected to be useful in manufacturing tetraalkoxysilane mentioned in Subchapter 2.4.” (Although we do have experimental evidence, only the concept is outlined due to a nondisclosure agreement.)4 Details of the strategyComment (Keiichi Ikegami)You write, “It was newly found that by chemically treating molten slag produced from municipal garbage disposal plants using acidic solutions under certain conditions, silica components in the molten slag precipitated as white solids.” This seems to come up rather abruptly. Perhaps you are not able to disclose the entire process, but can you explain a bit more about how you made this discovery and what strategy you took to achieve this?Answer (Norihisa Fukaya)I added the discussion on the reaction mechanism for this chemical treatment at the beginning of Subchapter 3.1: “The estimated mechanism of this reaction is examined. … That is, in this reaction system, acid has two roles: one is to make components other than silica soluble as ions, and the other is to act as a catalyst for silica production by a sol-gel reaction. Since condensation occurs after the sol state, in which silica has low molecular weight and is highly dispersed, the silica that is ultimately obtained by gelling is expected to have a high specic surface area.”5 Advancement of the technologyComment (Keiichi Ikegami)You advance the technology further in Subchapter 3.2, but what were the demands and issues in this case? In other words, why did you aim for porosity, not just the high specific surface area? (The improvement of specic surface area is little over 10 %, but can you expect dramatic increase in sales prices if you achieve a porous material?) Also, you write that the chemical treatment is conducted in acidic solution, but did you have any technological barriers in getting the surfactant to work in increased ionic strength?Answer (Norihisa Fukaya)I added the expectation about mesoporous silica materials and the citations for such expectations, to clarify the topics and demands for mesoporous silica. I also added the comment about the necessity of know-how to get the surfactant to function when using molten slag as the raw material.

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