هل ستصبح شريكنا القادم ؟
Therefore, xylene is an excellent active agent for the production of metallurgical quality briquettes with coal tar pitch as binder. Meanwhile, the compressive …
WhatsApp: +86 18221755073
Producing aromatics from coal via methanol is a novel technology, which could mitigate the energy shortage in a petroleum-poor area. ... A novel production of biobased p-xylene from hydroxymethylfurfual has been investigated and presented. This is an important part of a process for the production of aromatics from lignocellulosic ...
WhatsApp: +86 18221755073
Beside the nature of the feedstock, PA production processes are discriminated by different reactor tube lengths, different reactor tube inner diameters, different air rates, and the o-xylene air mixing ratio. Obviously, catalyst suppliers have to fine-tune process catalysts to the respective operating and design conditions of a …
WhatsApp: +86 18221755073
USY-zeolite was found to exhibit a remarkable activity for benzene, toluene and xylene production from coal hydrocracking at temperatures near 600 °C [16]. Many important processes of coal liquefaction, such as cracking, hydrocracking, and reforming, are based on the cleavage of C–C bonds in coals [17], [18].
WhatsApp: +86 18221755073
Toluene and xylene are carcinogenic and toxic compounds, and their presence in excessive amounts in the environment has an adverse impact on water quality, thus affecting public health. ... toluene & m-xylene removal from aqueous solutions by HZSM-5 nano-zeolite synthesized from coal fly ash. Journal of Cleaner Production, …
WhatsApp: +86 18221755073
In order to reduce dependence on nonrenewable resources and environmental damage, alternative renewable feedstocks are needed to replace fossil …
WhatsApp: +86 18221755073
Abstract The derivation of commercial naphthalene by rectification is a possible approach in coal-tar processing. Naphthalene is widely used in chemical synthesis for the production of phthalic anhydride, superplasticizers, and intermediate products such as Cleve's acids in dye production. The quality of the naphthalene derived from …
WhatsApp: +86 18221755073
A novel short process was proposed by reducing the high-energy consumption separation of xylene isomers in existing processes to improve the process economics and show a good economic value in terms of capital investment and operating costs due to the multistage reactor without benzene byproducts.
WhatsApp: +86 18221755073
Section snippets Process design and description for two processes. A simplified process for aromatics complex (AsC) is presented in Fig. 1(a). At present, the aromatics are preferably recovered in high yields and purity via hydro upgrading processes for petroleum fractions or coal-derived crude products (Chakinala and Chakinala, 2021, …
WhatsApp: +86 18221755073
The xylene mixture is a liquid blend comprising o-xylene (OX), m-xylene (MX), and p-xylene (PX). Mixed xylene is primarily utilized as aviation gasoline additive, paint solvent, and pesticide solvent. Due to the distinct properties of OX, MX, and PX, they are often separated for specific applications with significantly imbalanced demand ...
WhatsApp: +86 18221755073
Separating monomeric cycloalkanes from naphtha obtained from direct coal liquefaction not only facilitates the valuable utilization of naphtha but also holds potential for addressing China's domestic chemical feedstock market demand for these compounds. In extractive distillation processes of naphtha, relative volatility serves as a crucial …
WhatsApp: +86 18221755073
Section snippets Reagents and instruments. Raw fly ash was collected from Alborzmarkazi Coal Company located in Savadkhoh (Iran). All chemicals (analytical grade) including tetrapropylammonium bromide (TPABr), tetraethyl orthosilicate (TEOS), sodium hydroxide (NaOH), hydrochloric acid (HCl), ammonium chloride (NH 4 Cl), methanol (CH …
WhatsApp: +86 18221755073
found xylenes in coal tar. The importance of xylenes as major industrial chemicals began with the rise of the plastics industry in the 1920's and 30's, when polyesters were …
WhatsApp: +86 18221755073
Xylene is marketed principally as a mixture of ortho, meta and para isomers, generally referred to as 'mixed xylenes'. The individual isomers are also available commercially. Most mixed xylenes contain ethylbenzene, except for a small volume produced by toluene disproportionation (Ransley, 1984). Commercial-grade (mixed) xylene typically is …
WhatsApp: +86 18221755073
In a typical coal-burning house in South Africa, coal stoves are often used indoors during the winter season between 18:00 and 21:00. This is due to the inherent heat production of the technology, while in summer, it is unlikely that the stove will be used indoors for either cooking or space heating.
WhatsApp: +86 18221755073
Two configurations for aromatics production via catalytic naphtha reforming were considered as a case study, which showed that the configuration for production of BTX and the configuration for production of benzene and p-xylene should be feasible if the discounts in the naphtha price could reach 9% and 4.5% respectively (Omran et al., 2017).
WhatsApp: +86 18221755073
The physicochemical properties of coal fly ash and HZSM-5 were examined by various characterization techniques. The synthesized HZSM-5 was applied in simultaneous removal of benzene (B), toluene (T) and m …
WhatsApp: +86 18221755073
Several case studies are discussed that produce varying ratios of para-, ortho-, and meta-xylene across multiple refinery capacities. The results indicate that utilizing natural gas for the production of aromatics is profitable with net present values as high as $3800 MM dollars and payback periods as low as 6 years.
WhatsApp: +86 18221755073
The capacity for o-xylene production is in close agreement with the demand for this product. Exports to South American markets have been increasing, and have helped to offset falling ... Benzene was originally made solely from coal tar, until new processes began to emerge in the 1950s. The new production methods were based
WhatsApp: +86 18221755073
Request PDF | On Jul 1, 2016, Qiang Zhong and others published Xylene activation of coal tar pitch binding characteristics for production of metallurgical quality briquettes from coke breeze ...
WhatsApp: +86 18221755073
INTRODUCTION. Xylene is an aromatic hydrocarbon widely used in industry and medical technology as a solvent. It is a colorless, sweet-smelling liquid or gas occurring naturally in petroleum, coal and wood tar, and is so named because it is found in crude wood spirit (Gr. xy`lon- wood).[] It has a chemical formula of C6 H4 (CH 3)2 and is referred to as …
WhatsApp: +86 18221755073
found xylenes in coal tar. The importance of xylenes as major industrial chemicals began with the rise of the plastics industry in the 1920's and 30's, when polyesters were developed from p-xylene; from the mid-1950's, o-xylene also gained prominence as a raw material in the production of phthalic anhydride, alongside coal-derived naphthalene.
WhatsApp: +86 18221755073
Several case studies are discussed that produce varying ratios of para-, ortho-, and meta-xylene across multiple refinery capacities. The results indicate that utilizing natural gas for the production of …
WhatsApp: +86 18221755073
Section snippets Experimental. As illustrated in Fig. 1, the whole briquettes production process involves mixing the coke breeze with the pitch, dispersing of xylene …
WhatsApp: +86 18221755073
DOI: 10.1016/j.jclepro.2020.120688 Corpus ID: 213216970; Hybrid adaptive neuro-fuzzy inference systems for forecasting benzene, toluene & m-xylene removal from aqueous solutions by HZSM-5 nano-zeolite synthesized from coal fly ash
WhatsApp: +86 18221755073
Semantic Scholar extracted view of "Xylene activation of coal tar pitch binding characteristics for production of metallurgical quality briquettes from coke breeze" by Q. Zhong et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 220,368,212 papers from all fields of science ...
WhatsApp: +86 18221755073
4-6 Domestic U.S. p-Xylene Producers and 1992 Production Capacities .....4-23 4-7 Estimated Domestic U.S. Supply and Demand of o-Xylene .....4-24 4-8 Domestic U.S. o …
WhatsApp: +86 18221755073
Para-xylene global world production is of the order of 50 million tonnes per year, and accounts for 85–90% of global xylenes …
WhatsApp: +86 18221755073
Abstract. Since the BTX-aromatics benzene, toluene and xylene are co-generated, alongside other aromatics and non-aromatics during coal conversion and petroleum …
WhatsApp: +86 18221755073
Section snippets Experimental. As illustrated in Fig. 1, the whole briquettes production process involves mixing coal fines with coal tar pitch and molasses, dispersing of xylene in water, blending them with the mixture of coal fines and blended pitch, briquetting the final blended material, drying or curing the green briquettes, carbonizing …
WhatsApp: +86 18221755073
