Document jgN5Byro7aqxObV45kJ39NaQ5

1-1*4 (SOM) inter. office memo TENNECO CHEMICALS, INC. s \ To W.C. Champion AT Flemington Date January 9, 1974 From Subject F.W. Kanzler AT Burlington . B.hcopy to Carr H.H. Duhamel Defoamer Evaluation J.C. Fisher W. Miringoff R4}. Richards jZHe . bcc: C.C. Cattell R.J. Eckman A total of seven defoaraers were evaluated in the search for an acceptable FDA-sanctioned defoamer. The test was accomplished with the newly-set up apparatus in Burlington. Test results, listed in Table I, list foam break ranges and foam build-up ranges and times. The ranges are arbitrarily assigned numbers from 0 to 100 on the test vessel. The foam break range is established after the "as is" run (re-cycle of a 1% sodium lauryl sulfate solution in water) has been completed and the defoamer solution has been added in 25 ml increments. The solution re-cycle is then started to establish foam build-up range and time. The re-cycle is stopped at 90 to eliminate overflow of the test vessel and to guarantee the uniformity of the test results. The tabulated data gives rise to the following: 1. Foam Breaking Characteristics Aside from tributyl phosphate, the Nopco Foamaster B, TDB and Hercules 845 showed good foam breaking properties. 2. Antifoam Characteristics 1 Excellent foam retardants were Nopco TDB and Hercules 845, while Nopco Foamaster NS-1 showed antifoam properties better than TBP. 3. Solubility All defoamers tested showed good solubility with the exception of Nopco TDB. In addition, Nopco TDB showed accumulation of solids on the liq uid surface of the test solution after re-cycling. Based on the above, it is suggested that Process Engineering institute further evaluation of Nopco Foamaster B and Hercules 845. Vf. F.W. Kanzler Attachment. FWK/jst ( COLORITE 012627 S "A Tributyl Phosphate (TBP) / Nopco Foamaster B j>co Foamaster NS-1 Hercules 845 TABLE I DEFOAMER EVALUATION Cumulative Addition ml as is 25 50 75 Foam Break Range _ 100-65 93-63 62-62 Foam Build-Up Range Time secs. 42-90 52-90 50-90 50-90 39.7 62.8 55.0 93.4 Remarks: After the 75 ml addition, foam broke immediately after stopping the re-cycle as is 25 50 75 - 100-65 98-72 95-70 42-90 45-90 60-90 60-90 43.5 184.4 155.2 155.1 Remarks: Good foam breaking characteristics, large bubbles, very active break-up, good antifoam as is 25 50 75 - 100-65 98-75 98-75 ! 45-90 45-90 60-90 65-90 Remarks: Poor foam breaker, good antifoam I 37.8 208.8 157.3 128.3 as is 25 50 75 - 96-65 98-65 not run 45-90 36.3 46-90 279.2 48- no foam build-up Remarks: Excellent defoamer, excellent antifoam, however, not very water soluble, leaves agglomerates on liquid surface as is 25 50 75 - 100-60 65-58 not run 45-90 45-60 45-52 43.4 300.0 300.0 Remarks: Excellent defoamer, excellent antifoam, no solubility problem COLORITE 012628 Page 2 Mrcuies 831 Hercules ,4142 Cumulative Addition ml as is 25 50 75 Foam Break Range _ 100-68 100-65 100-77 Remarks: Not as good as TBP Foam Build-Up Range Time secs 45-90 50-90 50-90 60-90 36.2 55.1 80.2 92.3 as is 25 50 75 - 98-70 98-73 98-83 45-90 50-90 55-90 70-90 44.8 87.8 155.0 86.9 Remarks: Poor defoamer, antifoam characteristics equal to TBP \ R.J, Eckman F.W. Kanzler 1/9/74 COLORITE 012629