Chromic Acid - General, Process, Company Profiles, Consultants, Patent, Applications, Material Safety Data Sheet, Report

General

Chromic acid generally refers to a collection of compounds generated by the acidification of solutions containing chromate and dichromate anions or the dissolving of chromium trioxide in sulfuric acid.
Chromium trioxide is called chromic acid.
Chromic acid ( chromium trioxide, CrO3) is an odorless red deliquescent solid.
Chromic acid features chromium in an oxidation state of +6 (or VI), often referred to as hexavalent chromium.

Process

Chromium trioxide is produced commercially by the reaction of sodium dichromate with concentrated sulfuric acid or by electrolysis of sodium dichromate.
Most chromic acid solutions for finishing surfaces of metals, plastics and ceramics can now be used in a closed-loop process wherein the chromic acid solutions are continuously restored, purified and maintained at desired process conditions.
The closed loop is maintained using an Electrodialytic Process for conversion of chromium+3 to chromic acid and the removal of metal cation impurities from the loop.
Chromic acid plating solutions has predominantly been accomplished by either electrolytic or ion exchange methods.
Most ion exchange systems for chrome purification are based on the Recoflo ion exchange process.

Uses

Chromic acid is an intermediate in chromium plating, and is also used in ceramic glazes, and colored glass.
Because a solution of chromic acid in sulfuric acid (also known as a sulfochromic mixture) is a powerful oxidizing agent, it can be used to clean laboratory glassware.
Chromic acid has also been widely used in the band instrument repair industry, due to its ability to "brighten" raw brass.
In organic chemistry, dilute solutions of hexavalent chromium can be used to oxidize primary or secondary alcohols to the corresponding aldehydes and ketones.
Because of the oxidation is signaled by a color change from orange to a blue-green, chromic acid is used as a qualitative analytical test for the presence of primary or secondary alcohols.

Market

Chromated copper arsenate, the principal wood preservative manufactured from chromic acid, is providing virtually all the driving force for the chromic acid market.
Over the next four years, U.S. chromic acid consumption is anticipated to grow modestly, at 2.3 percent annually.

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