Volume 8, Issue 1, January 2020, Page: 5-10
Reducing HCl Release to the Environment by Eliminating Methyl Chloride at Reactors End of Run
Rahul Patil, Specialty Chemicals (Agricultural Products), Texas, USA
Kevin Rickert, Specialty Chemicals (Agricultural Products), Texas, USA
Received: Jun. 6, 2019;       Accepted: Feb. 10, 2020;       Published: Feb. 28, 2020
DOI: 10.11648/j.ajche.20200801.12      View  413      Downloads  162
Abstract
Study of unreacted MeCl clearing from CSTR reactors at the end of run: It is a unique set up with CSTR reactors in cascade, used to produce salt-based product, esters and methanol from this unit operations. This study involves chemical reaction Engineering and process improvement experiments along with control logics to perform the steps to eliminating MeCl to the environment either in vapor or liquid form. pH and agitation speed are critical criterion to determine the presence of MeCl in the final drained liquid after the end of run. Process trends have been depicted in the study to verify the authenticity of the steps followed. Practical methods have been run through the lab analysis as well as studies done through the real unit operations environment. Reaction calculation was also part of methods used to conclude some portion of the study. Most literatures were referred through MeCl thermal and physical property data through published safety data sheets and pending patents on scrubbing methods of MeCl. Data was also collected through lab analysis on GC spectrometry with both gas and liquid methods, collected reading from unit operations at different ranges of pressure profile. This discussion would involve the use of water and caustic wash to react most of the MeCl out. The point in question is to minimize or eliminate of HCl emissions generated through unreacted MeCl when reactors are at the end of run and eventually getting washed off. Study concludes by giving quantity of MeCl (eventually HCl) sent to flare or thermal oxidizer to eventually burn-out. Recommendations were made with respect to number of cycles of wash to minimize the inert levels, thermal efficiency improvement to crack down the MeCl down that will be burned as well as changes in handling the unit operations. Conclusions are based on flash calculations, chemical reaction between Caustic, Water and MeCl + heat through steam jackets with combinations of pressure and temperature changes. Results published with the successful run of the process that is being recommended through the study.
Keywords
Chlorine Emissions, Thermal Oxidizer for Organic Vents, Methyl Chloride Elimination, Caustic Scrubbing Method, Environment Health & Safety Compliance
To cite this article
Rahul Patil, Kevin Rickert, Reducing HCl Release to the Environment by Eliminating Methyl Chloride at Reactors End of Run, American Journal of Chemical Engineering. Special Issue: Advances in Catalysis Science and Technologies for Biomass Conversion to Bioenergy and Biofuels. Vol. 8, No. 1, 2020, pp. 5-10. doi: 10.11648/j.ajche.20200801.12
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Reference
[1]
Butler, J. H. Better budgets for methyl halides, Nature 403, 260–261 (2000).
[2]
Butler, J. H. et al. A record of atmospheric halocarbons during the twentieth century from polar firn air. Nature 399, 749–755 (1999).
[3]
Atmospheric Chemistry of Halogenated Organic Compounds, Timothy J. Wallington, Mads P. Sulbaek Andersen and Ole John Nielsen https://doi.org/10.1142/9789813147355_0005
[4]
Occupational Safety & Health Standard, regulation (standard 29 CFR), subpart title: Toxic and Hazardous Substances, part # 1910, standard # 1910-1200.
[5]
Maia Weissman, Sydney W. Benson, Pyrolysis of methyl chloride, a pathway in the chlorine‐catalyzed polymerization of methane, International Journal of Chemical Engineering (307-333) (1984).
[6]
Safety Data Sheet, Methyl Chloride.
[7]
United States Patent, Patent Number: 5,419,885, METHOD FOR THE DESTRUCTIVE SCRUBBING OF METHYL CHLORIDE. Henry Doran, Bray; Brian Keaveny.
[8]
United States Patent, Patent No.: US 10, 329, 226 B2. Date of Patent: Jun. 25, 2019; PROCESS FOR THE PRODUCTION OF CHLORINATED METHANES.
[9]
United States Patent, Patent Number: 1,688,726, Hydrolysis of methyl chloride, Ralph H. McKee.
[10]
Stephen L. Hung and Lisa D. Pfefferle, Methyl chloride and methylene chloride incineration in a catalytically stabilized thermal combustor, Environmental Science & Technology 1989 23 (9), 1085-1091, DOI: 10.1021/es00067a003.
[11]
Hubert T. Henderson and George Richard Hill, A Kinetic Study of Methyl Chloride Combustion, The Journal of Physical Chemistry 1956 60 (7), 874-878 DOI: 10.1021/j150541a010.
[12]
Wendell H. Wiser, George RichardHill, A kinetic comparison of the combustion of methyl alcohol and methane, Volume 5, Issue 1, 1955, Pages 553-558, https://doi.org/10.1016/S0082-0784(55)80073-2.
[13]
Rex T. Skodje, Alison S. Tomlin, Stephen J. Klippenstein, Lawrence B. Harding, and Michael J. Davis, Theoretical Validation of Chemical Kinetic Mechanisms: Combustion of Methanol, The Journal of Physical Chemistry A 2010 114 (32), 8286-8301, DOI: 10.1021/jp1047002.
[14]
Ralph H. McKee and Stephen P. Burke, The Conversion of Methyl Chloride to Methanol—I, Industrial & Engineering Chemistry 1923 15 (7), 682-688, DOI: 10.1021/ie50163a009.
[15]
Philip A. Marrone, Russell P. Lachance, Joanna L. DiNaro, Brian D. Phenix, Jerry C. Meyer, Jefferson W. Tester, William A. Peters, and K. C. Swallow. Methylene Chloride Oxidation and Hydrolysis in Supercritical Water. 1995, 197-216. DOI: 10.1021/bk-1995-0608.ch013.
Browse journals by subject