Document N2w2NB8JyN1DN2G1RQxKpxnzb

E. I. DU PONTDE NEMOURS & COMPANY KREBS PICMEKIS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Serial No. KN-50^35 Copy No. 1 Numerical Pile I NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Period Covered Final Report BENZIDINE YELLOWS, YT-630-D, YT-537-D (d c b ~^'a m2) ' PLANT ASSISTANCE SEPTEMBER 1, 1950 - OCTOBER 6, 1950 * X. N. r? HJ 3707' FILE: DATE: MR 221.4 11/3/50 Copy tot 1 - Numerical Pile aSX4 2 Research Office (221.4) 3 - Library Pile (221.4) 4 - V. Chalupski - Plant Piles 5 - D, B. Killian I - W. P. Spengeman/J.B.Callaway/PJM 7 - Extra Serial Wo. KN-50-35 Copy Wo* i NEWARK PLAN? PIGMENT COLON RESEARCH REPORT Final Report BENEZDINS YELLOWS, YT-630-D, YT-537-D (DCBtSfAAJU) PLANT ASSBTAfe SEPTEMBER 1, 1950 - OCTOBER 6, 1950 CHAISE* BC5-31 SUBMITTED BYt APPROVED BY* DAIS SUBSETTED* 10/26/50 DATS ISSUED* 11/3/50 DUP050068282 mmmmam The Chemical Division, at the reguest of tha Production Division, investigated the poor quality (dark, dull masstone* red, dull tint) of YT-537-D and YT-630-D produced in the period Aprll-September, 1950. Prior to thin period, the dark, dull type had not been encountered: ih the manufacture of approximately 16.000 pounds under Chemical Division supervision except in those batches known to have become contaminated. COiCLUSIQ& The poor quality of production under these codes for the period between Aprll-September, 1950 i believed to have been caused by a change In the quality of diohlorbensidlne received from Carwin, necessitating return to the use of activated carbon (Horlte) in the tetrazo clarification. A review of production records, observation of current production, and laboratory examina tion of recent shipments of DOB led to the following recommendations * 1. Use of Horlte (H-II3) in the tetrazo elarifloation in order to produce standard quality from DCS currently available, 2. Use of the temperature control cam provided for TT-537-D development. 3. Increase the acetic acid (N-30) from 439# to 527# in the standard batch (20# increase) to obtain light, green shading material* mi i p > Activated carbon (Horlte) had been used in the clarification of DCS tetrazos for many years. During the plant development of the Yf-537-D process, a batch was seriously contaminated with carbon black because of a leak in the clarification press. In order to eliminate repltition in subsequent production, the Horlte was omitted from the process in the manufacture of seventeen batches of YT-630-D and XT-537-D (approximately 12,000#) and standards wars set up on that basis. At the time of the first production of these codes under Production Division supervision, the quality of dleblorbenaidine had changed so that standard formula erratically produced an occasional satisfactory batch but predominantly dark and dull material. However, when Horlte was used again the quality was eonslatently close to standard. Therefore, it was recommended that the standard formula include the use of Horlte, and that the clarified tetrazo bq/ > recirculated at the start of the clarification step in order to minimize the possibility of carbon contamination. Examination of the batch cards for material made during this period showed s number of departures from the standard formula, the most serious was the heglect to use the development cam provided for it was known that too rapid development in the temperature range of 32-100F may result In low strength. The cam provided better control in that range. V DUP050068283 -2A laboratory study of independent variation In caustic plaoa of 439#)* With the currant quality DCB, using this acid variable In plant production, the masstones varied froa dark, red, dull to Q.K. when Norite was not used* With Norite, the production was consistently green and light When the acid variable was used* of production for the period Is appended. asasc Notebook 1371 - Sxpt. 1-4 incl. Letters) E.3. 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