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•
09 Mar 2016
TL;DR: In this paper, a heatproof curing adhesive material composition for a transformer and a preparation method of a heat-proof cured adhesive was presented, which is prepared from urea resin, benzoyl peroxide, dimethylaniline, polyoxyethylene sorbitan monooleate, ferrous sulfate, sodium dichromate, Sodium bicarbonate, ethyl alcohol and acetone.
Abstract: The invention discloses a heatproof curing adhesive material composition for a transformer and a preparation method of a heatproof curing adhesive. The composition is prepared from urea resin, benzoyl peroxide, dimethylaniline, polyoxyethylene sorbitan monooleate, ferrous sulfate, sodium dichromate, sodium bicarbonate, ethyl alcohol and acetone, wherein relative to 100 weight parts of the urea resin, the content of the benzoyl peroxide is 5-20 weight parts, the content of the dimethylaniline is 3-15 weight parts, the content of the polyoxyethylene sorbitan monooleate is 1-5 weight parts, the content of the ferrous sulfate is 10-30 weight parts, the content of the sodium dichromate is 15-30 weight parts, the content of the sodium bicarbonate is 5-15 weight parts, the content of the ethyl alcohol is 10-20 weight parts, and the content of the acetone is 15-35 weight parts. Through the design, heat resistance is good, the usability of the transformer in a high temperature environment is greatly improved, and safety is improved.
TL;DR: In this article, mild and efficient procedures for deprotection of the amine nitrogen protecting p-methoxyphenyl (PMP) group are described, using trichloroisocyanuric acid (TCCA) and periodic acid.
Abstract: Mild and efficient procedures for deprotection of the amine nitrogen protecting p-methoxyphenyl (PMP) group are described. Periodic acid and trichloroisocyanuric acid (TCCA) were found to be particularly effective in realizing amine liberation using 1 and 0.5 equiv of the oxidant, respectively. Extension of the periodic acid-mediated conditions to simultaneous alcohol oxidation by combination with a catalytic amount of sodium dichromate led to smooth conversion of PMP-protected Mannich products into the corresponding β-amino acids in a one-pot procedure.
Patent•
14 Dec 2016
TL;DR: In this article, a preparation method of n-hexyl aldehyde by sodium dichromate oxidation of nhexyl alcohol is presented, which does not contain chlorine and is more advanced compared to the prior art.
Abstract: The invention provides a preparation method of n-hexyl aldehyde by sodium dichromate oxidation of n-hexyl alcohol. The method comprises the following steps: 1) adding n-hexyl alcohol in a reaction device; 2) controlling the reaction temperature, and adding a sodium dichromate oxidation liquid; and 3) distilling and collecting a product n-hexyl aldehyde, and collecting unreacted n-hexyl alcohol, a by-product of hexyl hexanoate and chromium-containing sulfate from the reaction bed material by an extraction layering method. The product obtained by the preparation method of n-hexyl aldehyde by sodium dichromate oxidation of n-hexyl alcohol does not contain chlorine, and is more advanced compared to the prior art.
Patent•
06 May 1965TL;DR: In this article, heavy metal contaminants are removed from the products, obtained by the oxidation of an alkyl aromatic hydrocarbon in the presence of carbon dioxide and soluble inorganic dichromate salts, by treating them with an amount of carbon monoxide sufficient to precitate substantially all of the heavy metals from the solution at a temperature of 150-350 DEG F, the mixture during treatment having a pH of at least 8.
Abstract: Heavy metal contaminants are removed from the products, obtained by the oxidation of an alkyl aromatic hydrocarbon in the presence of carbon dioxide and soluble inorganic dichromate salts, by treating them with an amount of carbon monoxide sufficient to precitate substantially all of the heavy metals from the solution at a temperature of 150-350 DEG F., the mixture during treatment having a pH of at least 8, and subsequently removing the precipitate from the carboxy aromatic acid salt products of the process which remain in solution. In an example 2,6-dimethyl naphthalene is treated with carbon dioxide and an aqueous solution of a mixture of sodum chromate and sodium dichromate and the product containing solid Cr2O3, NaHCO3 and Na2CO3 and a solution of these carbonates and the sodium salt of 2,6-dicarboxynaphthalene is treated with carbon monoxide, the mixture filtered and the filtrate containing salts of 2,6-dicarboxy naphthalene acidified to precipitate the free acid, which is separated by filtration.
Patent•
19 Jun 2002
TL;DR: In this paper, a chromate solution having a sodium dichromate concentration of 20 to 30g/L is electro-coated on the surface of tin plate in an amount of 3.0 to 4.0 C/dm¬2.
Abstract: PURPOSE: A method for forming a chromate coating for tin coating steel sheet with excellent paint adherence with no addition of specific elements is provided. CONSTITUTION: The method is characterized in that a chromate solution having a sodium dichromate concentration of 20 to 30g/L is electro-coated on the surface of tin plate in an amount of 3.0 to 4.0 C/dm¬2. In the method, the chromate solution has a temperature range of 46 to 55°C, and a pH range of 4.0 to 5.0.