Document VDxrmprN6Z8r5e01y35nOMqZ

HTTJ INTERNAL CORRESPONDENCE ----CHEMICALS AND PLASTICS Received APR 2 3 1970 * N Wheeler P. O, BOX 471, TEXAS CITY, TEXAS 77S#0 TO (NAME) COMPANY LOCATION Dr. W. R. Manning TECHNICAL CENTER date April 20, 1970 COPY TO Mr. C E. Bowman Mr. 0. T. Carlisle Mr. F, G, Claris. - 501 Mr. M. E. Elsenhour Dr. C. W. McGary - 511 Mr. L* G. Peyton A. B. Steele - 501 R, N. Wheeler - 51k subject Suspension Vinyl Resins: Monomer Recovery Information from Wacker-Chemie Dear Ray: Further to my letter of April 1, 1970, the supplementary material from Wacker arrived and my translation is attached. If you have additional questions, please let me know. Yours very truly, EER/sJ Attachment Dean E. Richardson UCC 041328 TRANSLATION WACKER-CHKMIE GMBH Burghsusen Works March 26, 1970 Union Carbide Corporation Chemicals and Plastics Attn; Dean E, Richardson P. 0. Box ^71 Texas City, Texas 77590 Subject: E-l6l0 Monomer Recovery System Dear Mr. Richardson; Supplementary to the letter of our Group J dated March 23, 1970, we will answer the remaining questions as follows: No. 1: Concerning layout, we enclose our Drawing No. 1610/2686 showing our current recovery process with a single-stage horizontal compressor. Pressures and temperatures are noted. This system is still in use in the plant today. For some time we have used a two-stage, horizontal compressor with jacketed pressure piping in which the cooling water temperature is controlled so that con densation in the piping and cylinder is avoided with certainty. We enclose a suitable section of our drawing No. 1614/228 to illustrate. A difficult problem arises in packing the piston rod stuffing box against atmospheric air leaking in during the intake stroke. For this problem, we have included the use of a barrier chamber filled with nitrogen. Nevertheless, this solution is not completely satisfactory. Up to a year ago, we had settled on a single-stage, double action, dry running compressor from Klein, Schanzlin and Becker with the following data supplied: a Speed of rotation 145 rpm * Inlet pressure Compression 5.5-0.8 atmospheres 6.5 atmospheres Capacity, based on 295-212 cu.meters/hr. at lk50 rpm. (typo Piston 300 mm. error?) Stroke 230 mm. " Power Requirement 38 kw. These machines are still in service today .th one exception. Recently we obtained a two-stage, vertical, double acting compressor from Neuman and Esser with the following data; Speed of rotation Intake pressure Outlet pressure Capacity Pistons Stroke Power Requirement 300 rpm 6.0-0.19 atmospheres 11 atmos. 3^2-315 cu. meters/hr. 370/200 TflHI 200 mm. 65 kw. UCC 041329 6f5 'ff 041330 TRANSLATION 2 We have considered the use of a Nash Hytor-type pump such as you in America often use, but have made no final decision as yet. The preparatory work for this would require a long time. No. 2: For monitoring oxygen content, we have installed on the pressure side, immediately after the compressor, an oxygen detector with an adjustable alarm at some preset level. When the oxygen content exceeds the adjustable maximum, acoustical and optical alarms are actuated. No. 11: Rotary valves are used occasionally in our dryer design, as for example behind tube filters, cyclones and screens. They have shaft packing of F7C, and the outer seals are so arranged that neither can grease get into the product *br product into the outer seals. The speed of rotation is chosen so that the radial speed lies under 0.3 m. The clearance between the rotating blades and the housing should not be less than 0.25 mm. The blades are sloped on the backside relative to the direction of rotation, so that only a thin edge of about 1 mm. thickness remains. With friendly greetings, WACKER-CHEMIE GMBH Burghausen Works Group R (Two illegible signatures)