Effect of oxalic acid and sodium hydroxide on the desulfurization of coal using UV–H2O2 oxidation system

2021 ◽  
pp. 1-16
Author(s):  
Jinsong Yue ◽  
Mei Li ◽  
Ning Ding ◽  
Sidan Cheng ◽  
Caiyun Gao
Keyword(s):  
Oxalic Acid ◽  
Sodium Hydroxide ◽  
H2o2 Oxidation ◽  
Oxidation System

Improved O3/H2O2 oxidation process for wastewater reclamation

2001 ◽  
Vol 43 (10) ◽  
pp. 311-318 ◽  
Author(s):  
M. Yang ◽  
Y. Zhang ◽  
R. Qi ◽  
K. Uesugi ◽  
H. Myoga
Keyword(s):  
Oxidation Process ◽  
Ion Exchange Resin ◽  
Single Step ◽  
Wastewater Reclamation ◽  
Waste Gas ◽  
Toc Removal ◽  
Highest Occupied Molecular Orbital ◽  
H2o2 Oxidation ◽  
Model Substances ◽  
Oxidation System

A continuous two step O3/H2O2 oxidation system, in which the waste gas from the former reactor was reused in the latter step with an ejector, was established for the purpose of wastewater reclamation in electronics industries. ORP monitor was combined into the system to obtain the optimum ratio of H2O2 to O3 by automatically adjusting the dosage of H2O2, and ion exchange resin was used for removing organic acids formed during oxidation. The effectiveness of the O3/H2O2 oxidation system for TOC removal was investigated under various conditions by using IPA, DMSO, and NMP as model substances. The optimum H2O2/O3 for oxidizing IPA was in a range above 0.15, and it increased with the increase of O3 dose. A sudden drop of ORP from ca. 800 mV to a little more than 200 mV was observed when H2O2/O3 was approaching the optimum point from the lower end. An ORP between 250 mV and 300mV or 800 mV and 900 mV was proper for H2O2/O3 control. The treatability of the model substances was in an order of IPA<<DMSO<NMP, being consistent with the magnitude of the energy of the highest occupied molecular orbital (eHOMO). The two step treatment system developed in this study was found to be more efficient than the conventional single step system. With the help of H2O2 dosing control and two step treatment using waste O3, the system could save about 40% O3 in comparison with the conventional O3/H2O2 oxidation process.

Enrichment of Titanium from Panzhihua Mine Tailings

2014 ◽  
Vol 1030-1032 ◽  
pp. 69-72
Author(s):  
Shu Quan Wan ◽  
Cai Long Zhou ◽  
Zhong Xu ◽  
Hong Bo Han
Keyword(s):  
Sulfuric Acid ◽  
Oxalic Acid ◽  
Sodium Hydroxide ◽  
Mine Tailings ◽  
Titanium Content ◽  
Relative Content ◽  
Percentage Content ◽  
Relative Percentage ◽  
Molten Sodium ◽  
Enrichment Process

Relative percentage content of Fe in tailings decreased from 15.92% to 10.71% after treated by using sulfuric acid mixed with oxalic acid at 350K for 60 min. And the relative content of Si decreased from 16.3% to 11.9% after treated by molten sodium hydroxide at 1073K for 30 min. Titanium content increased from 6.315% (original tailings) to 8.512% after removed Fe, and continued to go up to 10.44% after removed Si. The contents of Ca, P and Mn were slightly changed in entire enrichment process by XRF analysis. The phase change of the entire process was studied by XRD, and results indicated that tailings had very complex phases, and after removed Si the phase of tailings partly changed into FeTiO3.

Oxidized Cellulose Nanofiber for Hemostatic Materials

2018 ◽  
Vol 792 ◽  
pp. 80-85
Author(s):  
Supitcha Rungrodnimitchai ◽  
Sirinapa Mayod ◽  
Suphatra Hiranphinyophat ◽  
Ditpon Kotatha ◽  
Chittra Dokbua
Keyword(s):  
Sodium Hydroxide ◽  
Aqueous Dispersion ◽  
Cellulose Nanofiber ◽  
Oxidized Cellulose ◽  
Carboxyl Content ◽  
Oxidation System

In this study, oxidized cellulose nanofiber was prepared from squeeze dried Nata de Coco sheet by the oxidation system of HNO3/H3PO4-NaNO2 at 30 °C for 24 hours. The ratio between HNO3 and H3PO4 was 1:3 v/v and the concentration of NaNO2 was 1.4% w/v. The carboxyl content and %yield of oxidized cellulose nanofiber from Nata de Coco (Nata-OC) was 28.6% and 68.4%, respectively. Then the Nata-OC was treated by several types of bases. Sodium hydroxide (NaOH) or triethanolamine (TEA) treated Nata-OC showed superior in gelation property to the original Nata-OC. The powder of base-treated Nata-OC gave stable Nata-OC aqueous dispersion, which might be applicable for spray-typed materials. The test papers obtained from 10% of base-treated Nata-OC dispersion showed good blood agglutinating property as same as dry sheet of pure Nata-OC. Moreover, the dispersion of base-treated Nata-OC could be coated on the surface of gauze without any additive.

Photochemical UVC/H2O2 oxidation system as an effective method for the decolourisation of bio-treated textile wastewaters: towards onsite water reuse

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90631-90645 ◽  
Author(s):  
Márcia M. F. F. Salim ◽  
Aline Novack ◽  
Petrick A. Soares ◽  
Ângela Medeiros ◽  
Miguel A. Granato ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Water Reuse ◽  
Wastewater Treatment Plants ◽  
Textile Wastewater ◽  
Biological Oxidation ◽  
H2o2 Oxidation ◽  
Textile Wastewater Treatment ◽  
Oxidation System ◽  
Textile Wastewaters

A photochemical UVC/H2O2 oxidation system was applied for the decolourisation of two real textile wastewaters collected after biological oxidation from two different textile wastewater treatment plants.

Degradation of O-Chlorophenol in a Micro-Electrolysis Contact Oxidation System

2012 ◽  
Vol 518-523 ◽  
pp. 2469-2474
Author(s):  
Da Wei Yu ◽  
Xiao Tong Guan ◽  
Liang Li ◽  
Xu Peng Yang
Keyword(s):  
Acetic Acid ◽  
Activated Carbon ◽  
Oxalic Acid ◽  
Acid Solution ◽  
Dissolved Oxygen ◽  
Degradation Rate ◽  
Electrode Reaction ◽  
Degradation Pathway ◽  
Contact Oxidation ◽  
Oxidation System

The characteristic and mechanism of o-chlorophenol degradation in a micro-electrolysis contact oxidation system has been investigated．The degradation rate of o-chlorophenol is higher in acid solution than that of in neutral or alkaline solution．Addition of activated carbon can make the degradation of o-chlorophenol easier by the surface contact catalysis．The dissolved oxygen in solution can take part in the electrode reaction and intensify the degradation of o-chlorophenol. Most intermediate products are 1,2-Benzenediol, glycerol, oxalic acid and acetic acid. By the analysis of intermediates for degraded o-chlorophenol, the possible degradation pathway of o-chlorophenol has been proposed.

scholarly journals Sintesis Asam Oksalat Dari Limbah Serbuk Kayu Jati (Tectona Grandis L.F.) Dengan Proses Hidrolisis Alkali

2018 ◽  
Vol 2 (1) ◽  
pp. 17
Author(s):  
Mufid Mufid ◽  
Agung Ari Wibowo ◽  
Ade Sonya Suryandari ◽  
An Nisaa’ Fithriasari ◽  
Pravianti Anindita Nastiti
Keyword(s):  
Oxalic Acid ◽  
Sodium Hydroxide ◽  
Tectona Grandis ◽  
Raw Material ◽  
Hydrolysis Time ◽  
Coarse Powder ◽  
Acid Yield ◽  
Hydrolysis Of Cellulose ◽  
Teak Wood ◽  
Hydrolysis Of

Selulosa adalah polisakarida rantai panjang penyusun serat pada tumbuhan. Hidrolisis selulosa dengan alkali kuat menghasilkan asam oksalat, asam asetat dan asam formiat. Limbah serbuk kayu jati berpotensi untuk dijadikan bahan baku pembuatan asam oksalat karena kandungan selulosa yang cukup tinggi. Hidrolisis yang dilakukan pada penelitian ini menggunakan natrium hidroksida (NaOH) sebagai zat penghidrolisis. Purifikasi asam oksalat dilakukan dengan penambahan kalsium klorida dan asam sulfat. Penelitian ini mempelajari pengaruh konsentrasi natrium hidroksida dan waktu reaksi terhadap yield asam oksalat. Produk tertinggi dengan yield 20% dicapai pada penggunaan serbuk kayu jati kasar dengan waktu hidrolisis 60 menit dan konsentrasi NaOH 1 N.Cellulose is a long chain fiber polysaccharide contained in plants. Hydrolysis of cellulose with strong alkali produces oxalic acid, acetic acid and formic acid. Waste from teak wood in powder formhas the potential to be used as raw material for the manufacture of oxalic acid because the content of cellulose is high enough. Sodium hydroxide (NaOH) as a hydrolysis agent was used in this study. Purification of formed oxalic acid was carried out by addition of calcium chloride and sulfuric acid. Our research studied the effect of sodium hydroxide concentration and reaction time on oxalic acid yield. The highest product with a yield of 20% was achieved on the use of coarse powder of teak wood waste with a hydrolysis time of 60 minutes and the concentration of NaOH 1 N.

Sign in / Sign up

Export Citation Format

Share Document