Document n9Gjjkpm6MObXKbMRZQ8434JR

TEflHECO CHEMICALS, INC. To F ROM Subject J, K. Jacob at piscataway E, J. Schuetz at Piscataway DEI-4987 VCM ADSORPTION SYSTEM, FLEMINGTON DEI-509r VCM ADSORPTION SYSTEM, BURLINGTON Date June 3, 1976 copy to Miringoff / J. P. Sandstedt'^ E, V. Schenke Development of additional information and data by the Pilot Plant in the following areas will be useful and in a number of cases essential for completing the final design of the Flemington and Burlington VCM Adsorption Systems. 1) Determine bed capacities as a function of VCM concentration in the inlet stream for the 100 ppm - 1% range. R&D work in developing the original system for VCM removal dealt mainly with higher concen trations. Later work stressed the very low range in order to comply with OSHA requirements. We find, in preparing for the proposed EPA rules, that many of the plant streams fall into the 100 ppm - 17. cate gory. For the preliminary design of the plant systems we have used -- published Calgon data for these mid-range values. Development by our own people of data in this range or confirmation of the Calgon values would certainly be a preferred basis for the final design, 2) Determine the short and long term effect of vinyl acetate on bed capacities. Will any new regeneration techniques be required? 3) Determine the effect upon the system of water in the inlet streams, especially when handling low concentrations of VCM. I believe that the majority of the work by R&D to date has been with streams that are essentially moisture free, while the plant streams in most cases will be saturated with water. It is my understanding that the presence of water can have an adverse effect upon VCM recovery when working with very low concentrations. At what level does this become an important consideration? Is some pre-treatment to remove water indicated? 4) Determine the effect upon the system of residual moisture in the bed after regeneration. The pilot plant has been able to do a very comple-fce and effective drying job on the carbon. Plant experience to date, however, has shown that it is not possible to match this perform ance within the alloted time using existing techniques. It appears that on a plant scale a very pronounced heat effect will be noted when handling VCM rich streams in very dry carbon beds. The net result is an unstable mass transfer zone and poor VCM removal efficiencies. In this case, some residual moisture, acting as a heat sink, would appear to benefit the system. Conversely, when handling very dilute VCM streams, residual moisture will have an adverse effect upon the system as noted in Section 3 above. COLORXTE 017570 J. K. Jacob June 3t 1976 Since we must deal with both situations, What is the preferred con dition of the carbon after regeneration? 5) The preliminary design of the units for Burlington and Flemington are based-on providing a three adsorber system. Typically, a tower, after regeneration, would spend one cycle handling dilute VCM streams followed by one cycle on concentrated streams and then be switched back to regen eration. Several runs in the pilot plant, under similar conditions, to confirm the carbon loadings used in the preliminary design would be worth while. 6) Additional information on the regeneration technique would be useful. Among the items to be considered are: Rate of desorption; lbs. of steam/ lb. VCM; lbs. of steam/lb. carbon; optimum steam temperature; optimum drying conditions; nitrogen rate - function of bed diameter - function of total carbon - total lbs. circulated - inlet temperature - outlet temperature, etc. 7) Determine the effect upon the system efficiency of very low velocities (less than 10 fpm). 8) Although not directly connected with the design of the carbon units, can we anticipate any process problems resulting from recycling recovered VCM back to the plant? EJS:vph COLORITE 017571 Patch STRIP-. ,1 gx3 1 2. ' 5-2-if: , / . : z. ,;/ ; s'zi, 2- fcs. ..... f &J? Z- [J3 : 3t; >32; A I z. i i S-! t; - ii 3I S72 1 H4/^ ^T&)P(/AJCr> ~TR\W ; I: : it ! ] j , . i . ; i X/VIT140 rew r~ 1 i . : ' : ! : ! jjXTtux>bi> FlrtM- iwe Ptigss. At Ail7U- . Wax. /VVE^. TBfnP TWFP REJCOtf. i VAC, ; VAC, : VAC> ! -- <^73 T9, a 1 2-2,6 3A? 3.3j? : 117 17 . V7 . 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