The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1986
Filed:
May. 10, 1982
Frank Gupton, Virginia Beach, VA (US);
Harry E Ulmer, Morristown, NJ (US);
Virginia Chemicals Inc., Portsmouth, VA (US);
Abstract
This invention provides a process for improving the separation and recovery of metal formate and pentaerythritol as crystalline products, from an aqueous waste stream of a pentaerythritol manufacturing operation which involves the reaction of formaldehyde with acetaldehyde in the presence of a metal hydroxide catalyst. The pentaerythritol process waste stream is passed through a macroreticular resin bed to remove organic byproducts, and the purified waste stream is then evaporatively concentrated to produce crystalline sodium formate product. The resultant mother liquor is diluted with water-miscible alkanol to precipitate a pentaerythritol-metal formate mixture. The precipitate is washed with a portion of waste stream feed to dissolve the metal formate and yield undissolved crystalline pentaerythritol as a product. At least about 85 percent of the metal formate and at least about 90 percent of the pentaerythritol contained in the original waste stream are recovered as products of the process.