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Information @ a Glance

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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