FORD FLTM AK 002-01-2001 ACID ACCEPTANCE AND STABILITY TESTS FOR TRICHLORETHYLENE《三氯乙烯的酸接受性和稳定性试验》.pdf

1、 FORD LABORATORY TEST METHOD AK 002-01 Date Action Revisions 2001 01 16 Revised Editorial no technical changes A. Cockman 1992 06 05 Printed copies are uncontrolled Page 1 of 4 Copyright 2001, Ford Global Technologies, Inc. ACID ACCEPTANCE AND STABILITY TESTS FOR TRICHLORETHYLENE Application This pr

2、ocedure describes three test methods which are used to evaluate trichlorethylene used in vapor degreasing operations. Description of Tests Trichlorethylene is subject to chemical breakdown under certain conditions with the formation of acidic constituents which are corrosive to metal parts. The foll

3、owing methods are used to determine the amount of acid formation and the stability of the trichlorethylene. Method A Determines the original acid acceptance value of the trichlorethylene which is a measure of the amount of acid which it will absorb. Method B Determines the degree of retention of the

4、 original acceptance value after refluxing with and distilling from fatty acids. This test simulates the refluxing action of trichlorethylene and grease or oil in a degreasing operation. Method C Simulates the action of trichlorethylene on aluminum. It measures the retention of the original acceptan

5、ce value after refluxing with aluminum chloride. Methods B and C are measures of the stability of the trichlorethylene under normal degreasing conditions. Apparatus Required Condenser Hot Plate 100 mL Erlenmeyer Flask For refluxing sample. FORD LABORATORY TEST METHOD AK 002-01 Page 2 of 4 Copyright

6、2001, Ford Global Technologies, Inc. 500 mL Distillation Flask 500 mL Erlenmeyer flask 25, 50 mL Graduate 1 mL Pipet Fitted with rubber bulb. 50 mL Buret Reagents Required Standard Sodium Hydroxide 0.1 N; see Ford Laboratory Test Method AZ 002-01, Reagent No. 1. Standard Alcoholic HCl Approximately

7、0.03 N; see Ford Laboratory Test Method AZ 002-01, Reagent No. 2. Phenolphthalein See Ford Laboratory Test Method AZ 002-01, Reagent No. 101. Aluminum Chloride Anhydrous - A.C.S. Oleic Acid Clear - U.S.P. Conditioning and Test Conditions All test values indicated herein are based on material conditi

8、oned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. FORD LABORATORY TEST METHOD AK 002-01 Page 3 of 4 Copyright 2001, Ford Global Technologies, Inc. Procedure Method A

9、- Original Acid Acceptance Value 1. Pipet 15 mL of trichlorethylene into a 100 mL Erlenmeyer flask and add by pipet 25 mL of alcoholic HCl solution. 2. Attach a water-cooled condenser to the flask, place on the electric hot plate and reflux for five minutes. 3. Remove the flask, cool and add 25 mL o

10、f distilled water. 4. Add 1 mL of phenolphthalein and titrate with standard NaOH (0.1 N) to a pink endpoint. Calculate as follows: (A x B) - (C x D) x 0.04 x 100 = acid acceptance as % NaOH 15 x 1.46 Where: A = mL of methanol - HCl solution added B = normality of methanol - HCl solution C = mL of Na

11、OH added D = normality of NaOH and 1.46 = Sp. Cr. of the trichlorethylene Method B - Acid Acceptance after Distillation from Fatty Acid 1. Transfer 300 mL of trichlorethylene to a 500 mL distillation flask. 2. Add 30 mL of oleic acid, attach a water-cooled condenser and distill 240 mL of trichloreth

12、ylene into an Erlenmeyer flask. 3. Label the distillate. To 15 mL of it add by pipet 25 mL of methanol HCl solution and follow Steps 2 - 4 of Method A. Report as acid acceptance value (% NaOH) after distillation from fatty acid. FORD LABORATORY TEST METHOD AK 002-01 Page 4 of 4 Copyright 2001, Ford

13、Global Technologies, Inc. Method C - Acid Acceptance after Exposure to Aluminum Chloride 1. Pipet 200 mL of the labeled distillate obtained in Method B, to a 500 mL Erlenmeyer flask. 2. Weigh 0.25 +/- 0.02 g of anhydrous aluminum chloride and add to the trichlorethylene. 3. Attach a water-cooled con

14、denser to the flask and reflux for ten minutes. 4. Allow to cool for ten minutes and filter 100 mL of the sample through a close paper to remove solid aluminum chloride. 5. Determine acid acceptance value on 15 mL of sample using Method A. 6. Report as acid acceptance value (% NaOH) after exposure t

15、o active metal chloride. Note: Aluminum chloride is unstable in air and must be protected from moisture, both while being weighed out (Step No. 2) and during the filter operation (Step No. 4). Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.