Topic
Sodium dichromate
About: Sodium dichromate is a research topic. Over the lifetime, 421 publications have been published within this topic receiving 6202 citations. The topic is also known as: Disodium salt & sodium bichromate.
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Patent•
30 Apr 2014
TL;DR: In this paper, a closed circulation clean production technique in a sodium chlorate production process is proposed in the method, and the clean SA production without chromium slag emission is realized by using the method.
Abstract: The invention discloses a sodium dichromate closed circulation clean production method for preparing sodium chlorate. A sodium dichromate closed circulation clean production technique in a sodium chlorate production process is proposed in the method, and the clean sodium chlorate production without chromium slag emission is realized by using the method. A ceramic membrane filtering technology is adopted, and a clean production process comprising the steps of salt dissolving, double-alkaline pretreatment, ceramic membrane, barium chloride process pretreatment, barium sulfate recovery, ceramic membrane, electrolysis, crystallization and electrolysis is proposed, so that the concentration of NaCl entering saline water in an electrolytic tank is larger than or equal to 300g/L, the contents of Ca , Mg , SO4 and Ba meet an electrolysis requirement, the content of SO4 in a crystallized mother solution is lower than 1mg/L, the electrolysis can be directly carried out without treating the mother solution, so that chromium slag is prevented from being generated. The sodium dichromate closed circulation clean production method in a sodium chlorate production process, disclosed by the invention, has the advantages of discharging no chromic salt mud, saving the precious chromium resource, solving the discharging problem of hexavalent chromium generated by sodium chlorate plants and generating a certain economic benefit.
2 citations
Patent•
14 Jan 2015
2 citations
TL;DR: In this article, the reaction conditions were optimized for 2-methylnaphthalene oxidation with sodium dichromate in aqueous sulfuric acid in the presence of fat-soluble vitamin K3.
Abstract: The reaction conditions were optimized for 2-methylnaphthalene oxidation to 2-methyl-1,4-naphthoquinone (fat-soluble vitamin K3) with sodium dichromate in aqueous sulfuric acid.
2 citations
Patent•
28 Aug 1996
TL;DR: Aniline is polymerized by oxidation at a reaction temperature in the range from -10 to -40{C in aqueous acid solution containing sufficient inert solute to keep it from freezing.
Abstract: Aniline is polymerized by oxidation at a reaction temperature in the range from -10 to -40{C in aqueous acid solution containing sufficient inert solute to keep it from freezing and using a dichromate (preferably sodium dichromate) as the oxidising agent.
2 citations
TL;DR: In this article, various methods were studied for the oxidation of 2-methyl-5-(phenylsulfonyl)benzenesulfamide and its derivatives, and conditions were proposed for obtaining the desired product in yields up to 95%.
Abstract: Various methods were studied for the oxidation of 2-methyl-5-(phenylsulfonyl)benzenesulfamide and its derivatives. The oxidation by sodium dichromate in sulfuric acid was found most efficient. The effects of temperature, concentration, reagent ratio, and time of the oxidation reaction on the yield of the desired product were investigated. Conditions were proposed for obtaining the desired product in yields up to 95%. A synthesis was developed for a series of new saccharin derivatives.
2 citations