Process for the Manufacture of 3,3'-Diaminobenzidine.
Abstract
This concludes the program for 3,3'-diaminobenzidine (DAB), a critical component for use in the production of PBI and other high temperature fibers. The basic requirements were that minimal quantities of DAB be produced, after the optimized parameters of chemical, engineering, and material requirements, for a fiber grade polymer, had been determined. The production runs were necessary to demonstrate product and process reproducibility by the proposed process and provide a reliable basis for the design of a one-million pounds per year plant. From the above determinations, the final specifications for raw materials, final product, and process would be derived. The process selected for this program consisted of three fundamental parts, (1) the ammonolysis of dichlorobenzidine (DCB) under pressure and high temperature in the presence of a copper catalyst, (2) the separation of the crude DAB from the reaction mixture by acid-base procedures, and (3) purification of the crude DAB by carbon column treatment followed by crystallization with water and ethylene glycol. A plant was designed specifying the facilities required to produce 1,000,000 pounds of DAB per year.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1973
- Accession Number
- AD0916558
Entities
People
- H. J. Burke
- S. M. Speaker Jr.